CN110388282B - Ceramic matrix composite exhaust nozzle tail spray component and engine comprising same - Google Patents
Ceramic matrix composite exhaust nozzle tail spray component and engine comprising same Download PDFInfo
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- CN110388282B CN110388282B CN201810336348.6A CN201810336348A CN110388282B CN 110388282 B CN110388282 B CN 110388282B CN 201810336348 A CN201810336348 A CN 201810336348A CN 110388282 B CN110388282 B CN 110388282B
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- 239000011153 ceramic matrix composite Substances 0.000 title claims abstract description 61
- 239000007921 spray Substances 0.000 title claims abstract description 37
- 239000002184 metal Substances 0.000 claims abstract description 168
- 238000006073 displacement reaction Methods 0.000 claims abstract description 10
- 238000009434 installation Methods 0.000 claims description 30
- 238000005507 spraying Methods 0.000 claims description 27
- 230000003014 reinforcing effect Effects 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 claims description 11
- 230000002787 reinforcement Effects 0.000 claims 2
- 230000013011 mating Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 13
- 230000008859 change Effects 0.000 description 10
- 239000000956 alloy Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000002737 fuel gas Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
- F02K1/78—Other construction of jet pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
- F02K1/78—Other construction of jet pipes
- F02K1/80—Couplings or connections
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
- Connection Of Plates (AREA)
Abstract
The invention provides a ceramic matrix composite exhaust nozzle tail spray component which comprises a tail spray component main body, a plurality of U-shaped metal clamping sleeves and a mounting flange, wherein a plurality of mounting grooves distributed along the circumferential direction of the tail spray component main body are arranged in the front edge area of the mounting end of the tail spray component main body, and a metal clamping block with a corresponding shape is arranged in each mounting groove to realize contact fit, so that the mounting grooves limit the displacement component of the metal clamping block forwards along the axial direction through contact; the U-shaped metal clamping sleeve is inserted into a corresponding area of the mounting groove, so that the metal clamping blocks are clamped in the U-shaped metal clamping sleeve in a one-to-one correspondence manner, the inner surface of the U-shaped metal clamping sleeve is in contact fit with the metal clamping blocks, and the displacement component of the metal clamping blocks relative to the mounting groove in the radial direction is limited; the mounting flange is connected with the U-shaped metal ferrule. The invention solves the problems of overhigh thermal mismatch stress and loose connection structure caused by thermal deformation mismatch between the ceramic matrix composite tail spray component and the metal connecting piece and the corresponding annular metal mounting flange.
Description
Technical Field
The invention relates to the field of aero-engines, in particular to a ceramic matrix composite exhaust nozzle tail nozzle component and an engine comprising the same.
Background
Ceramic matrix composites (Ceramic matrix composites) are composite materials formed by compounding Ceramic serving as a matrix and various fibers, generally have excellent performances such as high temperature resistance, high strength and modulus, low density, strong corrosion resistance and the like, and have wide application prospects in aerospace and aerospace heat end structural parts.
The commercial aircraft engine exhaust nozzle is a component for accelerating the expansion of fuel gas in the aircraft engine and injecting the fuel gas outwards at high speed to generate thrust, and generally comprises a tail nozzle component and a tail cone component, wherein the tail nozzle component and the tail cone component together form a flow passage surface for discharging the fuel gas of the engine. The exhaust nozzle assembly and its adjacent mounting structure are usually made of high temperature alloy materials with similar or identical thermal expansion coefficients, subject to the influence of high temperature service environment and thermal deformation matching. The high-temperature alloy material has the characteristics of low upper limit of use temperature, high density, poor chemical stability and the like, and is not beneficial to improving the performance index of the aero-engine. The ceramic matrix composite material is used for replacing a high-temperature alloy material to prepare the aeroengine tail jet member, so that the problems can be effectively solved.
However, the difference in thermal expansion coefficient between the ceramic matrix composite and the superalloy material may cause the connecting and mounting structure between the ceramic matrix composite exhaust nozzle member and the engine metal member to generate significant thermal mismatch stress, which may affect the safety and reliability of the member itself and the connecting structure.
The mechanical connection is a connection mode that different parts are connected together through mechanical external force, connection load is transmitted through connecting pieces in different forms, and riveting, screwing and the like are common forms. Thermal mismatch refers to a phenomenon that adjacent materials or components with different thermal expansion coefficients in the same system exhibit different thermal expansion deformation in the temperature change process, which is called a thermal mismatch phenomenon, and the thermal mismatch which cannot be released can cause significant thermal mismatch stress in the system.
In view of the above, those skilled in the art will appreciate that there is a need for an improved mounting structure for a cmc tailpipe member and an engine metal member to overcome the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to overcome the defects of poor safety and reliability and the like of a connecting and mounting structure adopting a ceramic matrix composite tail spray component in the prior art, and provides a ceramic matrix composite exhaust spray pipe tail spray component.
The invention solves the technical problems through the following technical scheme:
the tail spraying component of the ceramic matrix composite exhaust spraying pipe is characterized by comprising a tail spraying component main body, a plurality of U-shaped metal clamping sleeves and a mounting flange, wherein a plurality of mounting grooves distributed along the circumferential direction of the tail spraying component main body are formed in the front edge area of the mounting end of the tail spraying component main body, and a metal clamping block with a corresponding shape is arranged in each mounting groove to realize contact fit, so that the mounting grooves limit the displacement component of the metal clamping block forwards along the axial direction through contact;
the U-shaped metal clamping sleeve is inserted into a corresponding area of the mounting groove, so that the metal clamping blocks are clamped in the U-shaped metal clamping sleeve in a one-to-one correspondence manner, the inner surface of the U-shaped metal clamping sleeve is in contact fit with the metal clamping blocks, and displacement components of the metal clamping blocks relative to the mounting groove in the radial direction are limited; the mounting flange is connected with the U-shaped metal ferrule.
According to one embodiment of the invention, the mounting groove is in the shape of an isosceles triangle, and the metal fixture block is mounted in the mounting groove.
According to one embodiment of the invention, a plurality of U-shaped metal reinforcing grooves are further arranged in the front edge area of the mounting end of the tail spray component main body, the U-shaped metal reinforcing grooves are respectively and correspondingly positioned between two adjacent mounting grooves, and two ends of each U-shaped metal reinforcing groove are in contact fit with the U-shaped metal clamping sleeve corresponding to the mounting grooves.
According to one embodiment of the invention, bosses are arranged at two ends of the U-shaped metal reinforcing groove, grooves are arranged at two sides of the U-shaped metal cutting sleeve, the bosses are correspondingly contacted and matched with the grooves, and a gap is reserved between the circumferential end face of each boss and the circumferential end face of each groove in a room-temperature installation state.
According to one embodiment of the invention, the lower end part of the U-shaped metal cutting sleeve is provided with a slot, and the metal clamping block is inserted into the slot, is installed in a matching way with the inner surface of the U-shaped metal cutting sleeve and covers the installation slot and the edge area thereof.
According to one embodiment of the invention, the front end of the metal fixture block passes through the matching through hole on the U-shaped metal clamping sleeve and protrudes out, and the metal fixture block is fixed through a fastening part.
According to one embodiment of the invention, the front end of the metal fixture block is provided with a threaded column, the fastening component is a tightening nut, and the tightening nut is in threaded fit with the threaded column.
According to one embodiment of the invention, the upper end part of the U-shaped metal cutting sleeve is provided with a connecting part which protrudes along the radial direction, and the connecting part is provided with a waist-shaped through hole;
the mounting flange is annular mounting flange, just a plurality of mounting holes have been seted up on the annular mounting flange, the mounting hole with waist shape through-hole corresponds each other to it is right to pass the screw realization of screwing up the U type metal cutting ferrule with mounting flange's connection.
According to one embodiment of the invention, an included angle is formed between the inclined edge of the metal fixture block and the symmetrical axis;
a first reserved fit clearance is formed between one end of the metal clamping block and the inner wall surface of the mounting groove, and a second reserved fit clearance is formed between the other end of the metal clamping block and the inner wall surface of the mounting groove.
The invention also provides an engine which is characterized by comprising the ceramic matrix composite exhaust nozzle tail nozzle component.
The positive progress effects of the invention are as follows:
the tail spray component of the ceramic matrix composite exhaust spray pipe realizes the mechanical connection between the ceramic matrix composite tail spray component and the annular metal mounting flange of the aero-engine by designing the metal connecting piece and the mechanical connection structure with the specific structural form. In the process of environmental temperature change, the problems of overhigh thermal mismatch stress and loose connection structure caused by thermal deformation mismatch between the ceramic matrix composite tail spray component and the metal connecting piece and the corresponding annular metal mounting flange are solved, and the contact and transmission surfaces of the mounting loads are always kept in tight fit.
The mechanical connection structure is beneficial to reducing the difficulty of the ceramic matrix composite material tail spray component in the aspects of preparation forming, subsequent processing and installation implementation, has higher connection strength reliability, and has important value on the engineering application of the ceramic matrix composite material tail spray component and the improvement of the performance index of an aeroengine.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings in which like reference numerals denote like features throughout the several views, wherein:
FIG. 1 is a first schematic view of the installation of the mechanical connection structure of the exhaust nozzle tail nozzle member of the ceramic matrix composite according to the present invention.
Fig. 2 is an enlarged view of a portion a in fig. 1.
FIG. 3 is a second schematic view of the installation of the mechanical connection structure of the exhaust nozzle tail nozzle member of the ceramic matrix composite according to the present invention.
Fig. 4 is an enlarged view of a portion B in fig. 3.
FIG. 5 is a schematic view of the fitting installation of a metal fixture block and a tail spray member installation groove in the ceramic matrix composite exhaust nozzle tail spray member of the present invention.
[ reference numerals ]
Tail spray component body 10
U-shaped metal ferrule 20
U-shaped metal reinforcing groove 13
Threaded post 121
Tightening the nut 40
Connecting part 23
Waist-shaped through hole 231
Included angle alpha
First reserved fit clearance A1
Second reserved fit clearance A2
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
Further, although the terms used in the present invention are selected from publicly known and used terms, some of the terms mentioned in the description of the present invention may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein.
Furthermore, it is required that the present invention is understood, not simply by the actual terms used but by the meaning of each term lying within.
FIG. 1 is a first schematic view of the installation of the mechanical connection structure of the exhaust nozzle tail nozzle member of the ceramic matrix composite according to the present invention. Fig. 2 is an enlarged view of a portion a in fig. 1. FIG. 3 is a second schematic view of the installation of the mechanical connection structure of the exhaust nozzle tail nozzle member of the ceramic matrix composite according to the present invention. Fig. 4 is an enlarged view of a portion B in fig. 3. FIG. 5 is a schematic view of the fitting installation of a metal fixture block and a tail spray member installation groove in the ceramic matrix composite exhaust nozzle tail spray member of the present invention.
As shown in fig. 1 to 5, the invention discloses a ceramic matrix composite exhaust nozzle tail nozzle component, which comprises a tail nozzle component main body 10, a plurality of U-shaped metal cutting sleeves 20 and a mounting flange 30. A plurality of mounting grooves 11 distributed along the axial direction are arranged in the front edge area of the mounting end of the tail spray member main body 10, a metal fixture block 12 with a corresponding shape is arranged in each mounting groove 11, and the metal fixture block 12 is in contact fit with the mounting groove 11, so that the mounting groove 11 limits the displacement component of the metal fixture block 12 along the axial forward direction (i.e. the axial forward direction of the engine) through contact constraint. U type metal cutting ferrule 20 inserts the corresponding region of mounting groove 11 for metal fixture block 12 buckle in U type metal cutting ferrule 20 one-to-one, the internal surface of U type metal cutting ferrule 20 realizes the contact fit with metal fixture block 12, with this restriction metal fixture block 12 for the mounting groove 11 displacement component on radial direction. Meanwhile, the mounting flange 30 is connected with the U-shaped metal ferrule 20.
Preferably, the front edge area of the mounting end of the tail spraying member main body 10 is further provided with a plurality of U-shaped metal reinforcing grooves 13, the U-shaped metal reinforcing grooves 13 are respectively and correspondingly arranged between two adjacent mounting grooves 11, and two ends of each U-shaped metal reinforcing groove 13 are in contact fit with U-shaped metal cutting sleeves 20 at the corresponding mounting grooves 11. The U-shaped metal reinforcing groove 13 here may preferably be provided with bosses 131 at both ends thereof, while the U-shaped metal ferrule 20 is provided with grooves 21 at both sides thereof, and through the corresponding contact fit of the bosses 131 and the grooves 21, the circumferential end faces of the bosses 131 and the circumferential end faces of the grooves 21 are left with gaps in the room temperature installation state. The purpose of the arrangement is to eliminate the thermal deformation mismatch between the front edge area of the mounting end of the tail spraying component main body and the U-shaped metal clamping sleeve and the U-shaped metal reinforcing groove in the circumferential direction. The U-shaped metal reinforcing grooves 13 can increase the deformation rigidity of the front edge of the opening of the mounting end of the tail spray component main body 10 and fill gaps between adjacent U-shaped metal clamping sleeves 20.
Further, a slot 22 is provided at the lower end of the U-shaped metal ferrule 20, and the metal latch 12 is inserted into the slot 22, and is fitted to the inner surface of the U-shaped metal ferrule 20, and covers the mounting groove 11 and the edge area thereof. Meanwhile, the front end of the metal fixture block 12 passes through the matching through hole on the U-shaped metal clamping sleeve 20 and protrudes, and the metal fixture block 12 is fixed through the fastening part.
Preferably, the front end of the metal fixture block 12 is provided with a threaded post 121, and the fastening member is preferably a tightening nut 40, and the tightening nut 40 is in threaded engagement with the threaded post 121. Thus, the application of installation pretightening force among the metal clamping block 12, the U-shaped metal clamping sleeve 20 and the installation groove 11 and the mechanical connection among the three can be realized by matching and screwing the nut 40.
In addition, the upper end portion of the U-shaped metal ferrule 20 is provided with a connecting portion 23 protruding in the radial direction (i.e., the radial direction of the engine), and a kidney-shaped through hole 231 is opened in the connecting portion 23. The mounting flange 30 is an annular mounting flange, a plurality of mounting holes 31 are formed in the annular mounting flange, the mounting holes 31 correspond to the waist-shaped through holes 231, the U-shaped metal clamping sleeve 20 and the mounting flange 30 are connected by penetrating the tightening screws 50, and then the mechanical connection and mounting of the ceramic matrix composite tail jet component on the aircraft engine are finally achieved.
More preferably, in the present embodiment, the mounting groove 11 is approximately in the shape of an isosceles triangle, and the metal latch 12 with an approximately cross-sectional shape is designed and processed, so that the metal latch 12 is mounted in the mounting groove 11. In particular, the inclined edge of the metal latch 12 forms an included angle α with the symmetry axis. A first reserved fit clearance a1 is formed between one end of the metal latch 12 and the inner wall surface of the mounting groove 11, and a second reserved fit clearance a2 is formed between the other end of the metal latch 12 and the inner wall surface of the mounting groove 11. The specific values of the included angle α and the first and second pre-determined fitting clearances a1 and a2 are determined by the specific dimensions of the mounting groove and the metal clip. The minimum value of the included angle alpha is not less than the self-locking angle of the contact surface of the metal fixture block and the mounting groove, and the maximum value does not influence the formation of the structural characteristics of the mounting groove; the first reserved matching gap A1 and the second reserved matching gap A2 need to be as small as possible, but the metal fixture block and the mounting groove do not interfere in the temperature change process.
Because the coefficient of thermal expansion of metal material is greater than ceramic matrix composite, the thermal expansion volume of metal fixture block is different from the tail of correspondence and spouts the component mounting groove in the temperature variation process, spout the inclination and the relevant geometric dimensions of component mounting groove 11 hypotenuse through reasonable setting metal fixture block 12 and tail, can only take place to follow tangential direction's relative slip for its contact surface with the mounting groove in the temperature variation process for the metal fixture block, cooperate corresponding reservation clearance simultaneously, solved the thermal deformation mismatch problem between the two in the temperature variation process promptly.
In addition, the problem of thermal deformation mismatch between the ceramic matrix composite material tail spraying component and the annular metal mounting flange of the engine along the radial direction of the engine in the temperature change process can be solved by screwing the bolt to relatively slide in the waist-shaped through hole of the U-shaped metal clamping sleeve. Through the two aspects of design, the problem of thermal deformation mismatch of the mechanical connection structure of the ceramic matrix composite tail spraying component is completely solved.
According to the structural description, in the exhaust nozzle tail spray component made of the ceramic matrix composite material, the metal fixture block 12, the U-shaped metal fixture sleeve 20, the U-shaped metal reinforcing groove 13, the mounting flange 30, the tightening screw 50 and the tightening nut 40 are generally made of the same high-temperature alloy material, the thermal expansion coefficient of the metal fixture block is larger than that of the ceramic matrix composite material, and the tail spray component main body 10 is made of the ceramic matrix composite material.
The installation process of the ceramic matrix composite exhaust nozzle tail spray component is as follows:
firstly, the metal fixture block 12 is arranged in the tail spraying member in-plane installation groove 11, and the displacement of the metal fixture block in the tail spraying member material in-plane direction is restrained.
Then, the U-shaped metal reinforcing groove 13 is arranged at the position corresponding to the front edge of the mounting end of the tail spraying component main body 10,
then, the U-shaped metal ferrule 20 is inserted backward into the corresponding region of the mounting groove 11, so as to realize the fitting and mounting of the inner surface of the U-shaped groove 11 and the metal fixture block 12, and cover the mounting groove 11 and the edge region thereof, so as to limit the displacement of the metal fixture block 12 in the direction outside the material surface of the tail spraying member main body 10, and meanwhile, the U-shaped metal reinforcing groove 13 is in contact fit with the corresponding groove 21 on the adjacent U-shaped metal ferrule 20 through the fitting bosses 131 at both ends thereof, and a gap is left at the circumferential end surface.
In the above installation state, the threaded post 121 at the front end of the metal latch 12 passes through the matching through hole on the U-shaped metal ferrule 20 and protrudes outside, and then the tightening nut 50 is installed on the threaded post 121 at the front end of the metal latch 12 through threaded matching and applies a tightening torque, so that the mechanical connection installation and the application of pre-tightening force of the metal latch 12, the U-shaped metal ferrule 20, the U-shaped metal reinforcing groove 13, the tightening nut 50 and the tail spray member main body 10 are completed.
Finally, the tightening screw 40 passes through the waist-shaped through hole 231 on the U-shaped metal ferrule 20, and the proper amount of clearance or interference fit installation between the tightening screw and the U-shaped metal ferrule is realized. And then, correspondingly screwing the tightening screws 40 into the bolt mounting holes 31 on the annular metal mounting flange 30 to complete the mechanical connection and mounting pre-tightening force application between the U-shaped metal ferrule 20 and the annular metal mounting flange 30.
And finally, mechanically connecting the ceramic matrix composite tail jet member on the aircraft engine.
In the above mechanical connection structure, the thermal deformation mismatch problem between each metal connector and the tail nozzle member main body 10 made of the ceramic matrix composite material mainly exists in: between the metal fixture block 12 and the tail spraying component mounting groove 11. As shown in fig. 5, by reasonably setting the corresponding relationship between the angle of the included angle α and other geometric dimensions, only the relative sliding between the metal fixture block 12 and the mounting groove 11 along the tangential direction of the contact inclined plane can occur during the temperature variation process, as shown by the dotted arrow in fig. 5. The thermal deformation difference of the two can be released in the temperature change process through the relative sliding, the contact surfaces are always kept tightly attached, and meanwhile, the contact stress and the installation pretightening force between the two are basically kept constant.
In addition, the problem of thermal deformation mismatch between the metal fixture block 12 and the tail spraying component mounting groove 11 is completely solved by combining the first reserved fitting clearance a1 and the second reserved fitting clearance a2 which are in reserved fit as shown in fig. 5, and the mounting pretightening force is ensured to be basically kept unchanged.
In addition, a thermal deformation difference exists between the annular metal mounting flange 4 and the ceramic matrix composite tail spraying component 7 in the radial direction of the engine in the temperature change process, and the thermal deformation difference is released by driving the tightening screw 5 to slide in the kidney-shaped through hole 9 in the U-shaped metal clamping sleeve 2 through the annular metal mounting flange 4. The problem of thermal deformation mismatch inside the mechanical connection structure during temperature change can be completely eliminated through the design mechanism.
In addition, the invention also discloses an engine which comprises the ceramic matrix composite exhaust nozzle tail spray component.
The mechanical connection scheme of the ceramic matrix composite exhaust nozzle tail spray component of the invention has no clearance fit on the installation load transmission path, and is beneficial to the accurate installation and positioning of the ceramic matrix composite tail spray component. The tail spraying component of the ceramic matrix composite in the connection structure is simple in structural form, and only the mounting groove in the surface needs to be machined, so that the difficulty in preparing and forming the component is reduced, and the difficulty in machining the component is reduced. In the temperature change process, the problem of thermal deformation mismatch between the metal connecting piece and the tail spraying component main body is solved through the tangential relative sliding of the metal fixture block and the ceramic matrix composite material mounting groove between the contact surfaces, and the constancy of the mounting pretightening force is kept.
Meanwhile, the installation pretightening force between the metal connecting piece and the tail spraying component main body is independent of the installation pretightening force between the tail spraying component and the engine installation flange, so that the strength design space of the connecting structure is increased. In addition, the contact area between the metal connecting piece and the ceramic matrix composite tail spraying component is large, so that the transmission of mounting load and the reduction of contact stress are facilitated, the number of the metal connecting pieces is reduced, the connection rigidity is increased, and the strength reliability of the connection structure is obviously improved.
The ceramic matrix composite exhaust nozzle tail spray component of the invention achieves the following multiple purposes:
firstly, the ceramic matrix composite material is used for replacing a high-temperature alloy material to prepare the tail jet component of the exhaust jet pipe of the aero-engine, so that the defects of low upper limit of the use temperature, high material density and poor chemical stability of the high-temperature alloy material are overcome.
And secondly, by designing a specific metal connecting piece and a specific connecting structure form, the mechanical connection and installation between the ceramic matrix composite material tail spray component and the engine annular metal installation flange are realized, the problem of thermal deformation mismatch in a mechanical connecting structure is eliminated, and the safety and reliability of the connecting structure are improved.
And thirdly, in the temperature change process, the mounting pretightening force in the mechanical connecting structure of the ceramic matrix composite tail spraying component is basically kept unchanged, and the strength design difficulty of the connecting structure is reduced.
In conclusion, the ceramic matrix composite exhaust nozzle tail jet component realizes the mechanical connection between the ceramic matrix composite tail jet component and the annular metal mounting flange of the aero-engine by designing the metal connecting piece and the mechanical connection structure with the specific structural form. In the process of environmental temperature change, the problems of overhigh thermal mismatch stress and loose connection structure caused by thermal deformation mismatch between the ceramic matrix composite tail spray component and the metal connecting piece and the corresponding annular metal mounting flange are solved, and the contact and transmission surfaces of the mounting loads are always kept in tight fit.
The mechanical connection structure is beneficial to reducing the difficulty of the ceramic matrix composite material tail spray component in the aspects of preparation forming, subsequent processing and installation implementation, has higher connection strength reliability, and has important value on the engineering application of the ceramic matrix composite material tail spray component and the improvement of the performance index of an aeroengine.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (9)
1. The tail spraying component of the ceramic matrix composite exhaust spraying pipe is characterized by comprising a tail spraying component main body, a plurality of U-shaped metal clamping sleeves and a mounting flange, wherein a plurality of mounting grooves distributed along the circumferential direction of the tail spraying component main body are formed in the front edge area of the mounting end of the tail spraying component main body, and a metal clamping block with a corresponding shape is arranged in each mounting groove to realize contact fit, so that the mounting grooves limit the displacement component of the metal clamping block forwards along the axial direction through contact;
the U-shaped metal clamping sleeve is inserted into a corresponding area of the mounting groove, so that the metal clamping blocks are clamped in the U-shaped metal clamping sleeve in a one-to-one correspondence manner, the inner surface of the U-shaped metal clamping sleeve is in contact fit with the metal clamping blocks, and displacement components of the metal clamping blocks relative to the mounting groove in the radial direction are limited; the mounting flange is connected with the U-shaped metal ferrule;
the lower end of the U-shaped metal clamping sleeve is provided with a slot, the metal clamping block is inserted into the slot and is installed in a matched mode with the inner surface of the U-shaped metal clamping sleeve, and the U-shaped metal clamping sleeve covers the installation groove and the edge area of the installation groove.
2. The ceramic matrix composite exhaust nozzle tailpipe member of claim 1, wherein said mounting groove is in the shape of an isosceles triangle and said metal clip is mounted in said mounting groove.
3. The ceramic matrix composite exhaust nozzle tail nozzle assembly of claim 1, wherein a plurality of U-shaped metal reinforcement grooves are further disposed in the leading edge region of the mounting end of the tail nozzle assembly body, and are respectively and correspondingly disposed between two adjacent mounting grooves, and two ends of each U-shaped metal reinforcement groove are in contact fit with the U-shaped metal ferrule corresponding to the mounting groove.
4. The ceramic matrix composite exhaust nozzle tail spray component of claim 3, wherein bosses are provided at both ends of the U-shaped metal reinforcing groove, grooves are provided at both sides of the U-shaped metal ferrule, the bosses are correspondingly in contact fit with the grooves, and a gap is left between the circumferential end face of the boss and the circumferential end face of the groove in a room temperature installation state.
5. The ceramic matrix composite exhaust nozzle tailpipe member of claim 1, wherein the front end of said metal clip protrudes through a mating through hole in said U-shaped metal ferrule, and said metal clip is secured within said U-shaped metal ferrule by a fastening means.
6. The ceramic matrix composite exhaust nozzle tailpipe member of claim 5, wherein said front end of said metal fixture block is provided as a threaded post, said fastening component is a tightening nut, and said tightening nut is in threaded engagement with said threaded post.
7. The ceramic matrix composite exhaust nozzle tail nozzle component of claim 1, wherein the upper end of the U-shaped metal ferrule is provided with a radially protruding connection portion, and the connection portion is provided with a kidney-shaped through hole;
the mounting flange is annular mounting flange, just a plurality of mounting holes have been seted up on the annular mounting flange, the mounting hole with waist shape through-hole corresponds each other to it is right to pass the screw realization of screwing up the U type metal cutting ferrule with mounting flange's connection.
8. The ceramic matrix composite exhaust nozzle tailpipe member of claim 2, wherein the beveled edge of said metal clip makes an angle with the axis of symmetry;
a first reserved fit clearance is formed between one end of the metal clamping block and the inner wall surface of the mounting groove, and a second reserved fit clearance is formed between the other end of the metal clamping block and the inner wall surface of the mounting groove.
9. An engine comprising the ceramic matrix composite exhaust nozzle tailpipe member of any one of claims 1-8.
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| CN201810336348.6A CN110388282B (en) | 2018-04-16 | 2018-04-16 | Ceramic matrix composite exhaust nozzle tail spray component and engine comprising same |
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| CN201810336348.6A CN110388282B (en) | 2018-04-16 | 2018-04-16 | Ceramic matrix composite exhaust nozzle tail spray component and engine comprising same |
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| CN110388282B true CN110388282B (en) | 2020-09-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5090198A (en) * | 1990-05-04 | 1992-02-25 | Rolls-Royce Inc. & Rolls-Royce Plc | Mounting assembly |
| US7153054B2 (en) * | 2004-05-20 | 2006-12-26 | United Technologies Corporation | Fastener assembly for attaching a non-metal component to a metal component |
| US7247002B2 (en) * | 2004-12-02 | 2007-07-24 | Siemens Power Generation, Inc. | Lamellate CMC structure with interlock to metallic support structure |
| FR2916018B1 (en) * | 2007-05-10 | 2009-08-21 | Snecma Propulsion Solide Sa | EXHAUST SYSTEM FOR GAS TURBINE |
| US8047773B2 (en) * | 2007-08-23 | 2011-11-01 | General Electric Company | Gas turbine shroud support apparatus |
| US9845692B2 (en) * | 2015-05-05 | 2017-12-19 | General Electric Company | Turbine component connection with thermally stress-free fastener |
-
2018
- 2018-04-16 CN CN201810336348.6A patent/CN110388282B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110388282A (en) | 2019-10-29 |
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