Ceramic matrix composite single-sector combustion chamber test device and method

Abstract

A ceramic matrix composite (CMC) single-sector combustion chamber test device comprises a test piece and a fixing device. Wherein the test piece is of a frame-shaped structure made of a ceramic-based composite material, is used for simulating a combustion chamber structure and is provided with an air inlet end and an air outlet end; the fixing device comprises two metal fixing plates which are oppositely arranged, and the fixing plates are provided with jacking devices which abut against the surface of the test piece towards the inner side and jack the test piece so as to fix the test piece. According to the test device, the CMC structure and the metal piece are limited and fixed only through one-way pressure, the CMC structure does not bear tensile stress or shear stress due to expansion coefficient difference in the high-temperature test process, thermal mismatch hazards can be effectively eliminated, the CMC combustion chamber test efficiency in the development process is improved, and the test cost is reduced. The invention also provides a ceramic matrix composite single-sector combustion chamber test method.

Description

Technical Field

[0001] The invention belongs to the field of aviation engines, and in particular relates to a ceramic-based composite material single-sector combustion chamber test device and method. Background Art

[0002] Ceramic matrix composites (CMC) have the characteristics of light weight, high strength and excellent high-temperature mechanical properties. Therefore, using CMC to replace high-temperature alloy materials to manufacture the inner and outer rings of aircraft engine combustion chambers can significantly increase the upper limit of the operating temperature of combustion chamber components, improve the overall efficiency of the engine and reduce pollution emissions. The complete CMC material combustion chamber is large in volume. In order to reduce the test cost and shorten the trial production cycle, the design verification stage usually conducts tests on a single-sector combustion chamber as a unit, that is, a sector combustion chamber corresponding to one or several combustion chamber heads is manufactured instead of a full-ring combustion chamber for testing. At present, CMC combustion chamber test devices generally require the use of metal structures to fix CMC components. When conducting high-temperature tests, the thermal expansion coefficients of CMC and metal materials are quite different, and thermal mismatch problems are prone to occur. CMC combustion chambers are easily affected by additional stress and vibration loads during the test process, which is not conducive to test assessments under high temperature and high pressure conditions. Therefore, it is very necessary to provide a CMC composite single-sector combustion chamber test device that can avoid thermal mismatch for engine design and optimization. Summary of the invention

[0003] The purpose of the present invention is to provide a ceramic matrix composite material single sector combustion chamber test device, which can avoid thermal mismatch during high temperature testing. The present invention also provides a ceramic matrix composite material single sector combustion chamber test method.

[0004] An embodiment of one aspect of the present invention provides a ceramic-based composite single-sector combustion chamber test device, the device comprising a test piece and a fixing device; wherein the test piece is configured as a frame-shaped structure made of a ceramic-based composite material, the test piece simulates a combustion chamber structure, including an intake end and an exhaust end; the fixing device comprises two relatively arranged fixing plates, the fixing plates are made of metal material, the test piece is arranged between the fixing plates, and a tightening device is provided on the fixing plates, the tightening device abuts against the surface of the test piece inwardly and tightens the test piece to fix the test piece.

[0005] The metal parts of the device are fixed to the CMC test piece by tightening. The metal parts and the CMC test piece are limited only by the pressure generated by the tightening. The thermal deformation under high temperature conditions is easily absorbed by the test piece and the fixing device. No significant tensile stress or shear stress will be generated between the metal parts and the CMC test piece, effectively eliminating the thermal mismatch problem.

[0006] Further, in some embodiments, the test piece includes an inner ring sector plate, an outer ring sector plate and two side plates, the inner ring sector plate and the outer ring sector plate are connected to the two side plates at both ends, and the inner ring sector plate, the outer ring sector plate and the side plates are provided with a cross structure at the connection position, so that at least part of the inner ring sector plate, the outer ring sector plate and the side plates continue to extend beyond the connection position to form a support portion, and the jacking device abuts against the support portion. The support portion formed by the cross structure is conducive to the balance of the supporting force of the jacking device, which can improve the stability of the test device and reduce harmful vibrations.

[0007] Furthermore, in some embodiments, the cross structure is configured as a plug board and a socket, the plug board and the socket are snap-fitted to form a connection, and the plug board extends through the socket. The plug board and the socket structure are easy to process, and the formed support structure is stable.

[0008] Furthermore, in some embodiments, the clamping device includes a metal clamp and an elastic fastener, the metal clamp is L-shaped, and the elastic fastener is used to clamp the two sides of the L-shape against the supporting parts of the side plate and the inner ring sector plate or the outer ring sector plate. The L-shaped metal clamp can abut against two adjacent supporting parts at the same time, which is beneficial to force balance and structural stability.

[0009] Furthermore, in some embodiments, the elastic fastener is configured as a connecting pin and a fastening spring, and the connecting pin is inserted through the fixing plate. The fastening spring can keep the elastic fastener in a tightened state to avoid loosening of the bolt caused by temperature changes.

[0010] Furthermore, in some embodiments, the elastic fastener also includes an externally threaded nut, the externally threaded nut is fixed on the fixing plate, and the fastening spring abuts against the externally threaded nut to provide a pushing force for the connecting pin.

[0011] Furthermore, in some embodiments, the connecting pin is configured as a polished rod, and the central hole wall of the externally threaded nut is configured as a smooth wall. The externally threaded nut and the connecting pin are subjected to compressive stress only by the tightening spring, further avoiding stress generated between parts due to thermal deformation under high temperature conditions.

[0012] Furthermore, in some embodiments, the metal pressing block is manufactured using a cross-section sweep forming process.

[0013] Further, in some embodiments, the cross structure is configured as a plug plate and a socket, the plug plate and the socket are snap-fitted to form a connection, the plug plate extends through the socket, and the metal pressing block is provided with a snap-fitting portion, the snap-fitting portion is snap-fitted with a portion of the plug plate passing through the socket. The snap-fitting portion is snap-fitted with the plug plate, and the metal pressing block can be fixed on the test piece before the connecting pin is tightened.

[0014] Furthermore, in some embodiments, the tightening device is configured with four groups, which are respectively arranged at the connection positions of the inner ring sector plate, the outer ring sector plate and the two side plates of the test piece. Four groups of tightening devices are conducive to achieving force balance and improving the stability of the test piece during the test.

[0015] Furthermore, in some embodiments, the fixing device further comprises a head mounting frame, which is arranged at the air inlet end of the test piece and is fixedly connected to the fixing plates respectively, and the head mounting frame is provided with a fixing groove to be snap-fitted with the air inlet end of the test piece. The head mounting frame can provide an installation interface with the upstream test equipment and provide additional fixing support for the fixing plate.

[0016] Furthermore, in some embodiments, the head mounting frame further includes a mounting rib plate to allow the combustion chamber head assembly to be mounted on the mounting rib plate.

[0017] Furthermore, in some embodiments, the fixing device further comprises a mounting plate, which is arranged at the exhaust end of the frame-shaped member and is fixedly connected to the fixing plate, and the mounting plate is provided with a fan-shaped interface to allow the exhaust end of the test piece to be inserted into the fan-shaped interface. The mounting plate can assist in positioning the test piece and provide additional support for the fixing plate, thereby enhancing the structural stability of the test device.

[0018] Furthermore, in some embodiments, cooling holes are provided on the mounting plate.

[0019] Another embodiment of the present invention provides a ceramic matrix composite single-sector combustion chamber test method, comprising the following steps: providing a ceramic matrix composite single-sector combustion chamber test piece, setting a plurality of sets of elastic fasteners to provide pressure from the outside to the inside to fix the test piece; providing a high temperature and high pressure test environment, and performing a combustion test in the test piece. The compressive stress fixation can effectively avoid the thermal mismatch caused by the difference in thermal expansion coefficients between the metal parts of the test device and the CMC parts, improve the test success rate, and reduce the development cost.

[0020] Furthermore, the method adopts the ceramic matrix composite single-sector combustion chamber test device in any of the aforementioned embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1a This is a schematic diagram of the structure of a CMC single-sector combustion chamber test device in one embodiment;

[0022] Figure 1b This is a schematic diagram of the top view of the CMC single-sector combustion chamber test device in one embodiment;

[0023] Figure 1cThis is a schematic diagram of the cross-sectional structure of a CMC single-sector combustion chamber test device in one embodiment;

[0024] Figure 2a Schematic diagram of the structure of the inner ring sector plate and the outer ring sector plate in one embodiment;

[0025] Figure 2b This is a schematic diagram of the side panel structure in one embodiment;

[0026] Figure 2c This is a schematic diagram of the test piece structure in one embodiment;

[0027] Figure 3a This is a schematic diagram of the metal pressing block structure in one embodiment;

[0028] Figure 3b This is a schematic diagram of the metal pressing block installation structure in one embodiment;

[0029] Figure 4 This is a schematic diagram of the structure of an elastic fastener in one embodiment;

[0030] Figure 5 This is a schematic diagram of the structure of a fixed plate in an embodiment;

[0031] Figure 6 for Figure 1c A schematic diagram of the partially enlarged structure;

[0032] Figure 7 This is a schematic diagram of the structure of the installation disk in one embodiment;

[0033] Figure 8a This is a schematic diagram of the outer structure of the head mounting frame in one embodiment;

[0034] Figure 8b This is a schematic diagram of the inner structure of the head mounting frame in one embodiment.

[0035] The purpose of the above drawings is to explain the present invention in detail so that those skilled in the art can understand the technical concept of the present invention, but it is not intended to limit the present invention. For the sake of simplicity, the above drawings only schematically illustrate the structures related to the technical features of the present invention, and do not strictly draw the complete device and all details according to the actual scale. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The phrase appearing in various locations in the specification does not necessarily refer to the same embodiment, nor is it limited to mutually exclusive independent or alternative embodiments. Those skilled in the art should be able to understand that the embodiments herein may be combined with other embodiments without causing structural conflicts.

[0038] In the description of this article, unless otherwise clearly specified and limited, the technical terms "installed", "connected", "connected" and the like should be understood in a broad sense, which can be a movable connection, a fixed connection or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0039] In the description of this document, terms indicating orientation or positional relationships, such as "up", "down", "left", "right", "horizontal", "vertical", "height", "length", and "width", are intended to accurately describe the embodiments and simplify the description, but are not intended to limit the parts or structures involved to have a specific orientation, be installed or operate in a specific orientation, and should not be construed as a limitation on the embodiments in this document.

[0040] In the description of this article, the terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating relative importance or limiting the quantity, specific order or primary and secondary relationship of the described technical features. In the description of this article, the meaning of "plurality" is at least two.

[0041] In one aspect of the present invention, there is provided a ceramic matrix composite single sector combustion chamber test device, the structure of which is as follows: Figure 1a The test device includes a test piece 1 and a fixing device 2, and its top view structure is as shown in Figure 1b As shown, Figure 1b The AA cross-section structure is as follows Figure 1c As shown. The test piece 1 is made of ceramic matrix composite material (CMC), including a frame structure formed by an outer ring sector plate 11, an inner ring sector plate 12 and two side plates 13a, 13b, which simulates the structure of a single sector of the combustion chamber as a whole; the fixing device 2 includes two fixing plates 21a, 21b, and the fixing plates 21a, 21b are provided with a tightening device 30, which abuts inwardly and tightens on the surface of the test piece 1 to form a fixation. The fixing device 2 is made of metal, and in some embodiments, one or more of heat-resistant steel, nickel-based alloy and titanium alloy can be used.

[0042] Specifically, the structures of the outer ring sector plate 11 and the inner ring sector plate 12 are as follows: Figure 2aAs shown, the outer ring sector plate 11 and the inner ring sector plate 12 are provided with air film holes 103 penetrating in the thickness direction, and the outer side of the outer ring sector plate 11 (the side away from the axis of the annular combustion chamber) is further provided with a mounting seat 111 for mounting the test equipment. The edges of the outer ring sector plate 11 / inner ring sector plate 12 connected to the side plates 13a and 13b are provided with protruding plug plates 101 for connecting with the side plates 13a and 13b. The structure of the side plates 13a and 13b is shown in FIG. Figure 2b As shown, through sockets 102 are provided at the longitudinal ends of the side plates 13a and 13b. The shape and size of the sockets 102 correspond to the plug plate 101, so as to allow the plug plate 101 to be inserted to form a cross structure, so that the outer ring sector plate 11, the inner ring sector plate 12 and the two side plates 13a and 13b are as shown. Figure 2c The two side plates 13a and 13b are connected in the manner shown. The portions of the two side plates 13a and 13b closer to the edge of the socket 102 and the portion of the plug plate 101 passing through the socket 102 form a support portion 104 that continues to extend beyond the connection position. The frame-shaped test piece 1 is formed with an intake end 10a with a larger opening and an exhaust end 10b with a smaller opening. During the test, the mixed oil and gas enter from the intake section 10a and burn in the frame structure of the test piece 1, and the burned gas is discharged from the exhaust end 10b.

[0043] In some embodiments, the cross structure formed by the outer ring fan-shaped plate 11 / inner ring fan-shaped plate 12 and the two side plates 13a / 13b can also adopt other forms. For example, the socket can be set on the outer ring fan-shaped plate 11 / inner ring fan-shaped plate 12 and the plug plate can be set on the two side plates 13a / 13b; the socket 102 can also be replaced by an L-shaped clip instead of a through hole.

[0044] The structure of the tightening device 30 is as follows: Figure 1c As shown in the B area, its enlarged structure is as follows Figure 6 As shown, combined Figure 3a , Figure 3b and Figure 4 The pressing device 30 includes a metal pressing block 31 and an elastic fastener 32. The metal pressing block 31 has a structure as shown in FIG. Figure 3a As shown, its cross section is L-shaped, and the whole cross section is swept and formed. A circular arc-shaped limiting surface 311 is provided at the turning position of the L-shape to connect with the elastic fastener 32. The two sides of the L-shape are respectively a support surface 312 for tightening the side plate and a support surface 313 for tightening the plug board 101. A clamping portion 314 is further provided on the support surface 313 to be clamped and fixed with the plug board 101. The metal pressing block 31 is provided with a variety of sizes to match the plug boards 101 of different positions and sizes.

[0045] The structure of the elastic fastener 32 is as follows: Figure 4As shown, it includes a connecting pin 322, a fastening spring 323 and a nut 324. The end of the connecting pin 322 is set as a pushing part 321 abutting against the metal pressing block 31, and a flange 325 is set near the pushing part 321 to support the fastening spring 323.

[0046] In a preferred embodiment, the connecting pin 322 is configured as a smooth rod, and the inner hole of the nut 324 is configured as a smooth hole to allow the connecting pin 322 to pass through and slide relatively. The nut 324 is configured as an external thread nut and is tightened on the fixing plate through the external thread. Figure 5 As shown, the upper and lower ends of the fixing plate 21b are provided with inclined support ribs 211, and the support ribs 211 are provided with a plurality of mounting holes 212, and the number of the mounting threaded holes 212 is consistent with the number of the plug board 101. The installation state of the tightening device 30 is as shown in FIG. Figure 6 As shown, the connecting pin 322 passes through the mounting hole 212, so that the pushing top portion 321 abuts against the limiting surface 311 of the metal pressure block 31 at approximately 45 degrees, and one end of the fastening spring 323 abuts against the flange 325. The externally threaded nut 324 is threaded in the mounting hole 212 so that its bottom end abuts against the other end of the fastening spring 323. The nut 324 is tightened in the mounting hole 212 through an external thread and tightened to a predetermined mounting tightening torque. During the tightening process, the tightening spring 323 pushes the flange 325 of the connecting pin 322, so that the metal pressure block 31 is abutted against the supporting portion 104 under the action of the pushing portion 321, and its supporting surface 312 presses against the side plate 13b, and the supporting surface 313 presses against the plug plate 101 at the edge of the outer ring fan plate 11; tightening devices 30 are provided on the four edges of the test piece 1 for tightening, so that the overall force of the test piece 1 is balanced, and the positions in contact with the fixing device 2 are mainly compressive stress.

[0047] In some embodiments, the tightening device 30 may be provided in more than four groups, for example, several groups of tightening devices perpendicular to the outer ring sector plate 11, the inner ring sector plate 12 and the side plates 13a, 13b may be provided to fix the test piece 1. In some embodiments, the metal pressing block may also be provided to tighten against only one plane. In some embodiments, the tightening spring 323 may also replace other elastic structures such as an elastic metal gasket.

[0048] Through the above structure, the interaction between the CMC test piece 1 and the metal fixture 2 is mainly compressive stress. When conducting a high temperature test, the thermal mismatch caused by the difference in thermal expansion coefficients between CMC and metal is easily offset by the fixture. The support portion 104 will only be subjected to the squeezing effect from the metal pressing block 31, and the connecting pin 322 will only be subjected to the pushing effect from the fastening spring 323. The CMC structure will not be subjected to significant tensile stress or shear stress. Furthermore, the elastic fastener 32 can adaptively maintain the tight state of the metal pressing block 31 through the spring, avoid relaxation caused by thermal mismatch, and reduce the vibration of the test piece 1 during the simulated combustion process.

[0049] In a preferred embodiment, the fixing device 2 further includes a head mounting frame 23, the structure of the head mounting frame 23 is as follows: Figure 8a and Figure 8b The outer side of the head mounting frame 23 (i.e., the side away from the test piece 1) is provided with mounting edges 231 on both sides, and mounting holes 232 are provided on the mounting edges 231. Figure 5 , bolts 25 pass through the mounting holes 232 and the through holes 213 on the fixing plates to fix the fixing plates 21a, 21b to the mounting edges of the head mounting frame 23. A protruding mounting rib 233 is also provided on the outside of the mounting edge 23 for mounting combustion chamber head components such as vortex finders, caps, splash plates, etc. during the test. A fixing groove 234 is provided on the inner side of the head mounting frame 23 (i.e., the side facing the test piece 1). The shape and size of the fixing groove 234 are consistent with the intake end 10a of the test piece 1, allowing the outer ring sector plate 11, the inner ring sector plate 12 and the two side plates 13a, 13b to be snapped into the fixing groove 234 to form a limit constraint along the intake direction of the combustion chamber. It should be understood that a reasonable tolerance is provided between the fixing groove 234 and the test piece 1.

[0050] In a preferred embodiment, the fixing device 2 further includes a mounting plate 24, the structure of which is as follows: Figure 7 The mounting plate 24 is provided with a plurality of through holes 242. Figure 5 , the bolts 26 pass through the through holes 242 and the through holes 215 on the mounting edge 214 of the fixing plate to fix the mounting plate 24 to the two fixing plates 21a, 21b. A fan-shaped interface 241 is provided in the middle of the mounting plate 24, and the size of the fan-shaped interface 241 matches the size of the exhaust end 10b of the test piece 1 to allow the exhaust end 10b of the test piece 1 to be inserted into the fan-shaped interface 241. It should also be understood that a reasonable tolerance is provided between the fan-shaped interface 241 and the exhaust end 10b of the test piece 1. In a further preferred embodiment, a plurality of through cooling air holes 243 are provided on the mounting plate 24, which are used as cooling air flow channels during the combustion test of the combustion chamber, allowing the passage of cooling air flow for cooling.

[0051] According to another aspect of the present invention, there is provided a method for testing a single-sector combustion chamber of a ceramic matrix composite material, the steps of which are as follows:

[0052] First, assemble the test piece. Figure 2a The outer ring sector plate 11 and the inner ring sector plate 12 shown in FIG. Figure 2b The side panels 13a and 13b are spliced ​​together, and the plug board 101 is inserted into the socket 102 for fixing, so as to obtain the following Figure 2c The test piece 1 shown in FIG. wherein the insert plate 101 intersects with the side plates 13 a / 13 b to form a support portion 104 .

[0053] Next, assemble the fixture. Figure 3b As shown, a metal pressing block 31 is installed on the plug board 101, and the clamping portion 314 of the metal pressing block 31 is clamped on the plug board 101. The exhaust end 10b of the test piece 1 is inserted into the fan-shaped interface 241 of the mounting plate 24, and two fixing plates 21a and 21b are arranged on the left and right sides of the test piece 1. The fixing plates 21a and 21b are fixedly connected to the mounting plate 24 by bolts 26. Next, the head mounting frame 23 is installed on the air inlet end 10a of the test piece 1, so that the fixing groove 234 of the head mounting frame 23 is clamped with the port of the air inlet end 10a of the test piece 1, and the fixing plates 21a and 21b are fixedly connected to the head mounting frame 23 by bolts 25. Subsequently, the fastening spring 323 is inserted into the stud 322 and installed into the mounting holes 212 of each supporting rib 211 of the fixing plates 21a and 21b respectively, and the nut 324 is tightened from the outside and a preset mounting clamping torque is applied to make the pushing part 321 abut against the limiting surface 311 of the metal pressure block 31, thereby transmitting the pressure of the fastening spring 323 to the supporting part 104, thereby realizing the limiting fixation of the test piece 1 by compressive stress.

[0054] Finally, each combustion chamber head assembly is installed on the mounting rib 233 of the head mounting frame 23, and the test device is installed as a whole on an external test bench to provide a closed high-temperature and high-pressure environment. Oil and gas are input from the air inlet end 10a of the test piece 1 and ignited in the test piece 1 to perform a combustion simulation test, thereby completing the test of the CMC combustion chamber test piece.

[0055] In a preferred embodiment, the above method is implemented using the CMC single-sector combustion chamber test piece provided in any of the aforementioned embodiments. In other embodiments, the CMC test pieces with different structures are fixed by providing compressive stress from the outside to the inside. For example, the CMC test piece is clamped and fixed by using a metal belt with a matching structure, so as to avoid the negative impact of thermal mismatch and reduce harmful vibrations.

[0056] The purpose of the above embodiments is to further explain the technical concept of the present invention in detail in conjunction with the accompanying drawings so that those skilled in the art can understand the technical concept of the present invention. Within the scope of the claims of the present invention, the optimization or equivalent replacement of the part structure or method steps involved, and the combination of implementation methods in different embodiments without conflict of structure and principle, all fall within the protection scope of the present invention.

Claims

1. A ceramic matrix composite single-sector combustion chamber test device, characterized in that: It includes a test piece and a fixture; wherein, The test piece is configured as a frame-shaped structure made of a ceramic-based composite material, and the test piece simulates a combustion chamber structure, including an intake end and an exhaust end; The fixing device includes two fixing plates arranged opposite to each other, the fixing plates are made of metal material, the test piece is arranged between the fixing plates, and a tightening device is arranged on the fixing plates, the tightening device abuts against the surface of the test piece toward the inside and tightens the test piece to fix the test piece.

2. The ceramic matrix composite single-sector combustion chamber test device according to claim 1, characterized in that: The test piece includes an inner ring fan-shaped plate, an outer ring fan-shaped plate and two side plates. The two ends of the inner ring fan-shaped plate and the outer ring fan-shaped plate are respectively connected to the two side plates. The inner ring fan-shaped plate, the outer ring fan-shaped plate and the side plates are provided with a cross structure at the connection position, so that at least part of the inner ring fan-shaped plate, the outer ring fan-shaped plate and the side plates continue to extend beyond the connection position to form a support portion, and the tightening device abuts against the support portion.

3. The ceramic matrix composite single-sector combustion chamber test device according to claim 2, characterized in that: The cross structure is configured as a plug board and a socket, the plug board and the socket are snap-fitted to form a connection, and the plug board extends through the socket.

4. The ceramic matrix composite single-sector combustion chamber test device according to claim 2 or 3, characterized in that: The clamping device includes a metal pressing block and an elastic fastener. The metal pressing block is L-shaped and is clamped by the elastic fastener so that both sides of the L-shape abut against the supporting parts of the side plate and the inner ring sector plate or the outer ring sector plate at the same time.

5. The ceramic matrix composite single-sector combustion chamber test device according to claim 4, characterized in that: The elastic fastener is configured as a connecting pin and a fastening spring, and the connecting pin is penetrated through the fixing plate.

6. The ceramic matrix composite single-sector combustion chamber test device according to claim 5, characterized in that: The elastic fastener also includes an externally threaded nut, which is fixed to the fixing plate. The fastening spring abuts against the externally threaded nut to provide a pushing force for the connecting pin.

7. The ceramic matrix composite single-sector combustion chamber test device according to claim 6, characterized in that: The connecting pin is configured as a polished rod, and the central hole wall of the externally threaded nut is configured as a smooth wall.

8. The ceramic matrix composite single-sector combustion chamber test device according to claim 4, characterized in that: The metal pressing block is manufactured by adopting a cross-section sweep forming process.

9. The ceramic matrix composite single-sector combustion chamber test device according to claim 4, characterized in that: The cross structure is configured as a plug board and a socket, the plug board and the socket are snap-fitted to form a connection, the plug board extends through the socket, and the metal pressing block is provided with a snap-fitting portion, and the snap-fitting portion is snap-fitted with a portion of the plug board passing through the socket.

10. The ceramic matrix composite single-sector combustion chamber test device according to claim 2 or 3, characterized in that: The tightening device is configured with four groups, which are respectively arranged at the connection positions of the inner ring sector plate, the outer ring sector plate and the two side plates of the test piece.

11. The ceramic matrix composite single-sector combustion chamber test device according to claim 1 or 2, characterized in that: The fixing device also includes a head mounting frame, which is arranged at the air inlet end of the test piece and fixedly connected to the fixing plates respectively. The head mounting frame is provided with a fixing groove to be snap-fitted with the air inlet end of the test piece.

12. The ceramic matrix composite single-sector combustion chamber test device according to claim 11, characterized in that: The head mounting frame further includes a mounting rib to allow a combustion chamber head assembly to be mounted on the mounting rib.

13. The ceramic matrix composite single-sector combustion chamber test device according to claim 1 or 2, characterized in that: The fixing device also includes a mounting plate, which is arranged at the exhaust end of the frame-shaped member and fixedly connected to the fixing plates respectively. The mounting plate is provided with a fan-shaped interface to allow the exhaust end of the test piece to be inserted into the fan-shaped interface.

14. The ceramic matrix composite single-sector combustion chamber test device according to claim 13, characterized in that: The mounting plate is provided with cooling holes.

15. A ceramic matrix composite single sector combustion chamber test method, characterized in that: The following steps are involved: A ceramic matrix composite single-sector combustion chamber test piece is provided, and a plurality of sets of elastic fasteners are provided to fix the test piece by applying pressure from the outside to the inside; A high temperature and high pressure test environment is provided, and a combustion test is performed in the test piece.

16. The ceramic matrix composite single sector combustion chamber test method according to claim 15, characterized in that: A ceramic matrix composite single-sector combustion chamber test device as described in any one of claims 1 to 14 is used.

Images