Cooling exhaust system suitable for combustion chamber performance test bench

Abstract

The cooling exhaust system comprises a water cooling sleeve, a lining pipe and a smoke sampling device, the water cooling sleeve comprises a pipe outer wall and a pipe inner wall, and a water cooling cavity is defined between the pipe outer wall and the pipe inner wall; a smoke cavity is defined between the lining pipe and the pipe inner wall of the water cooling sleeve, smoke passing holes are formed in the pipe side wall of the lining pipe, and the lining pipe is used for being connected with a combustion chamber test piece outlet; and the flue gas sampling device is arranged at the flue gas outlet of the lining pipe. The inner wall of the water cooling sleeve can be set to be relatively thick, so that the pressure bearing capacity of the water cooling sleeve is enhanced, the pressure bearing capacity of the whole structure is enhanced, and the safety of the system is improved. Under the condition that the span is long, the pipe inner wall of the water-cooling sleeve structure can bear large single-side pressure, the risk that the water-cooling sleeve structure is damaged under the limiting working condition is reduced, protection of other devices on the test bed is facilitated, and chain damage caused by faults of a cooling system is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion chamber test benches, and particularly relates to a cooling and exhaust system applicable to a combustion chamber performance test bench. Background Art

[0002] With the continuous development of gas turbine technology, as the core hot-end component, the importance of performance assessment tests for the combustion chamber has become increasingly prominent. During the combustion chamber performance test, to ensure the accuracy of test results, it is necessary to precisely measure the components of the discharged high-temperature flue gas. For this purpose, a long connecting section is usually set between the outlet of the combustion chamber test piece and the flue gas measurement point to achieve a uniform distribution of the flue gas flow field, and at the same time, water-cooled spraying or thin-walled water-cooled sleeves are used to cool down the long connecting section.

[0003] However, when the thin-walled water-cooled sleeve scheme is adopted, the inner wall of the thin-walled water-cooled sleeve is directly in contact with the mainstream high-temperature flue gas. To reduce thermal stress, the wall thickness is set to be relatively thin. In the case of a long span, the structure of the thin-walled water-cooled sleeve is difficult to withstand a large unilateral pressure and is easily damaged under extreme conditions, thereby causing damage to other equipment on the test bench. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0005] For this reason, an embodiment of the present invention provides a cooling and exhaust system applicable to a combustion chamber performance test bench.

[0006] The cooling and exhaust system applicable to a combustion chamber performance test bench according to an embodiment of the present invention includes a water-cooled sleeve, a lining tube, and a flue gas sampling device. The water-cooled sleeve includes an outer tube wall and an inner tube wall. A water-cooling cavity is defined between the outer tube wall and the inner tube wall. The outer tube wall is provided with a water inlet and a water outlet that communicate with the water-cooling cavity.

[0007] The lining tube is arranged inside the inner tube wall of the water-cooled sleeve, and both ends of the lining tube are hermetically connected to the inner tube wall of the water-cooled sleeve respectively. A flue gas cavity is defined between the lining tube and the inner tube wall of the water-cooled sleeve. A flue gas passing hole communicating with the flue gas cavity is formed on the tube side wall of the lining tube. The two end ports of the lining tube are respectively a flue gas inlet and a flue gas outlet. The flue gas inlet is used to be connected to the outlet of the combustion chamber test piece; the flue gas sampling device is arranged at the flue gas outlet of the lining tube and is used to sample the flue gas discharged from the flue gas outlet.

[0008] In some embodiments, the length of the water-cooled sleeve is greater than or equal to 3 m.

[0009] In some embodiments, the cooling exhaust system applicable to the combustion chamber performance test bench of the present invention includes a support rod. The outer wall and inner wall of the water-cooled sleeve are respectively provided with a first perforation and a second perforation for the support rod to pass through. One end of the support rod sequentially passes through the first perforation and the second perforation and extends into the flue gas chamber to be connected to the inner lining pipe. The support rod is respectively connected to the outer wall and inner wall of the water-cooled sleeve.

[0010] In some embodiments, spoiler columns are provided on the inner wall of the pipe and located in the water-cooled chamber. The spoiler columns extend along the radial direction of the water-cooled sleeve.

[0011] In some embodiments, double helical threads are provided on the outer wall surface of the spoiler columns.

[0012] In some embodiments, the cooling exhaust system applicable to the combustion chamber performance test bench of the present invention includes a spray cooling pipe and a nozzle. The inlet end of the spray cooling pipe is communicated with the flue gas outlet of the inner lining pipe. The nozzle is arranged in the spray cooling pipe and is used for spraying coolant towards the flue gas flowing through the spray cooling pipe.

[0013] In some embodiments, the cooling exhaust system applicable to the combustion chamber performance test bench of the present invention further includes an axial flow valve. The inlet end of the axial flow valve is communicated with the outlet end of the spray cooling pipe.

[0014] In some embodiments, the cooling exhaust system applicable to the combustion chamber performance test bench of the present invention further includes a movable exhaust pipe and a fixed exhaust pipe. The inlet end of the movable exhaust pipe is communicated with the outlet end of the axial flow valve. The outlet end of the movable exhaust pipe is communicated with the inlet end of the fixed exhaust pipe. The movable exhaust pipe and the fixed exhaust pipe are coaxially arranged. The movable exhaust pipe is movably connected to the fixed exhaust pipe along its axial direction.

[0015] In some embodiments, the cooling exhaust system applicable to the combustion chamber performance test bench of the present invention further includes a moving bracket and an electric push rod. The moving bracket is arranged below the movable exhaust pipe to drive the movable exhaust pipe to move. The electric push rod is arranged between the movable exhaust pipe and the fixed exhaust pipe to push the movable exhaust pipe to move.

[0016] In some embodiments, the cooling exhaust system applicable to the combustion chamber performance test bench of the present invention further includes an orifice diffuser. The orifice diffuser is arranged at the outlet end of the fixed exhaust pipe and is used for reducing the speed and noise of the flue gas discharged from the fixed exhaust pipe.

[0017] For the cooling and exhaust system applicable to the combustion chamber performance test bench according to the embodiment of the present invention, since smoke holes are provided on the tube side wall of the inner lining tube, the high-temperature flue gas entering the inner lining tube can enter the smoke chamber through the smoke holes. Therefore, the inner lining tube does not bear pressure during the test. After the test starts, the flue gas in the smoke chamber basically does not flow, and its temperature will be greatly reduced compared with the mainstream flue gas temperature inside the inner lining tube. That is to say, the temperature difference between the inner and outer sides of the inner wall of the water-cooled sleeve is relatively small, and the thermal stress borne by the inner wall of the water-cooled sleeve during the test is relatively small.

[0018] Therefore, compared with the related art, the present invention can set the wall thickness of the inner wall of the water-cooled sleeve relatively thick to enhance its pressure-bearing capacity, thereby enhancing the pressure-bearing capacity of the entire structure and improving the safety of the system. In the case of a relatively long span, the inner wall of the water-cooled sleeve structure can withstand a large unilateral pressure, reducing the risk of being damaged under extreme working conditions, helping to protect other equipment on the test bench, and avoiding chain damage caused by cooling system failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the cooling and exhaust system applicable to the combustion chamber performance test bench according to the embodiment of the present invention.

[0020] Figure 2 is a schematic diagram of the structure of the water-cooled sleeve according to the embodiment of the present invention.

[0021] Figure 3 is a partial structure schematic diagram of the water-cooled sleeve according to the embodiment of the present invention.

[0022] Figure 4 is a schematic diagram of the structure of the spray cooling pipe according to the embodiment of the present invention.

[0023] Figure 5 is a connection schematic diagram of the movable exhaust pipe and the fixed exhaust pipe according to the embodiment of the present invention.

[0024] Figure 6 is a connection schematic diagram of the fixed exhaust pipe and the opening argon diffuser according to the embodiment of the present invention.

[0025] REFERENCE SIGNS:

[0026] 100, cooling and exhaust system applicable to the combustion chamber performance test bench; 200, combustion chamber test piece; 1, water-cooled sleeve; 101, outer tube wall; 102, inner tube wall; 103, water-cooled chamber; 104, water inlet; 105, water outlet; 2, inner lining tube; 201, flue gas inlet; 202, flue gas outlet; 3, smoke chamber; 4, flue gas sampling device; 5, support rod; 6, flow disturbance column; 7, spray cooling pipe; 8, spray head; 9, axial flow valve; 10, movable exhaust pipe; 11, fixed exhaust pipe; 12, moving bracket; 13, electric push rod; 14, opening diffuser. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0028] like Figures 1 to 6 As shown, the cooling exhaust system 100 for a combustion chamber performance test bench according to an embodiment of the present invention comprises a water cooling jacket 1, an inner liner 2 and a flue gas sampling device 4. The water cooling jacket 1 comprises an outer tube wall 101 and an inner tube wall 102, a water cooling cavity 103 is defined between the outer tube wall 101 and the inner tube wall 102, and a water inlet 104 and a water outlet 105 connected to the water cooling cavity 103 are provided on the outer tube wall 101.

[0029] The inner liner tube 2 is arranged in the inner wall 102 of the water-cooling jacket 1, and the two ends of the inner liner tube 2 are respectively sealed and connected to the inner wall 102 of the water-cooling jacket 1, and a smoke cavity 3 is defined between the inner liner tube 2 and the inner wall 102 of the water-cooling jacket 1. A smoke hole communicating with the smoke cavity 3 is opened on the side wall of the inner liner tube 2, and the two end ports of the inner liner tube 2 are respectively a smoke inlet 201 and a smoke outlet 202, and the smoke inlet 201 is used to be connected to the outlet of the combustion chamber test piece 200. The smoke sampling device 4 is arranged at the smoke outlet 202 of the inner liner tube 2, and is used to sample the smoke discharged from the smoke outlet 202.

[0030] When the cooling exhaust system 100 for the combustion chamber performance test bench of the embodiment of the present invention is in use, the high-temperature flue gas is discharged from the outlet of the combustion chamber test piece 200, enters the inner liner 2 through the flue gas inlet 201, and is discharged through the flue gas outlet 202. Cooling water flows into the water cooling chamber 103 from the water inlet 104 of the water cooling jacket 1, removes the heat in the flue gas through cooling, and then flows out from the water outlet 105. A flue gas sampling device 4 is provided at the flue gas outlet 202 of the inner liner 2, which can sample and analyze the discharged flue gas to monitor the composition and temperature of the flue gas and other parameters.

[0031] Since there is a smoke hole on the side wall of the inner liner tube 2, the high-temperature smoke entering the inner liner tube 2 can enter the smoke cavity 3 through the smoke hole. Therefore, the inner liner tube 2 is not under pressure during the test. After the test starts, the smoke in the smoke cavity 3 basically does not flow, and its temperature will be greatly reduced compared with the mainstream smoke temperature inside the inner liner tube 2. In other words, the temperature difference between the inner and outer sides of the inner wall 102 of the water-cooling jacket 1 is relatively small, and the thermal stress borne by the inner wall 102 of the water-cooling jacket 1 during the test is relatively small.

[0032] Therefore, compared with the related art, the present invention can set the wall thickness of the inner wall 102 of the water-cooled sleeve 1 to be relatively thick to enhance its pressure-bearing capacity, thereby enhancing the pressure-bearing capacity of the entire structure and improving the safety of the system. In the case of a relatively long span, the inner wall 102 of the water-cooled sleeve 1 structure can withstand a large unilateral pressure, reducing the risk of damage under extreme conditions, helping to protect other equipment on the test bench, and avoiding chain damage caused by cooling system failures.

[0033] Optionally, the wall thickness of the inner liner tube 2 can be set to be relatively thin. The design of the thin-walled inner liner tube 2 allows it to freely expand and contract under the action of high-temperature flue gas, which helps to release the thermal stress generated due to temperature changes and reduces the risk of damage caused by thermal stress.

[0034] In some embodiments, the length of the water-cooled sleeve 1 is greater than or equal to 3 m.

[0035] A longer water-cooled sleeve 1 means that the contact time between the flue gas and the cooling water is longer, which helps for more sufficient heat exchange, thereby improving the cooling efficiency, enabling the temperature of the flue gas to be more effectively reduced before being discharged, and achieving the function of rectifying the discharged high-temperature flue gas. The longer water-cooled sleeve 1 helps to achieve a uniform distribution of the flue gas temperature. During the long-distance flow, the heat exchange between the flue gas and the cooling water is more uniform, reducing the phenomenon of local overheating. For high-temperature flue gas, the longer water-cooled sleeve 1 can play a buffering role, reducing the thermal shock on the pipe wall caused by temperature sudden changes, thereby extending the service life of the water-cooled sleeve 1.

[0036] In some embodiments, the cooling and exhaust system 100 applicable to the combustion chamber performance test bench according to the embodiment of the present invention includes a support rod 5. The outer wall 101 and the inner wall 102 of the water-cooled sleeve 1 are respectively provided with a first through hole and a second through hole for the support rod 5 to pass through. One end of the support rod 5 sequentially passes through the first through hole and the second through hole and extends into the flue gas chamber 3 and is connected to the inner liner tube 2. The support rod 5 is respectively connected to the outer wall 101 and the inner wall 102 of the water-cooled sleeve 1.

[0037] For example, as shown in Figure 1 and Figure 2 shown, by setting the support rod 5, the internal pressure or external pressure borne by the inner wall 102 can be transmitted to the outer wall 101 to a certain extent, so as to further improve the actual pressure-bearing capacity of the water-cooled sleeve 1. Of course, the number of support rods 5 can be set to be multiple, forming a stable support structure for enhancing the stability of the water-cooled sleeve 1. Especially when the length of the water-cooled sleeve 1 is relatively long, it can effectively resist deformation caused by factors such as thermal expansion and vibration, improve the durability of the entire cooling and exhaust system in high-temperature and high-pressure environments, and extend the service life.

[0038] In some embodiments, turbulator posts 6 are provided on the inner wall 102 of the tube and are located in the water-cooling cavity 103. The turbulator posts 6 extend along the radial direction of the water-cooling sleeve 1.

[0039] As Figure 3 shown, the addition of the turbulator posts 6 will increase the turbulence degree of the cooling water, which helps to improve the heat transfer efficiency of the cooling water, accelerate the absorption and dissipation of heat, and thus improve the overall cooling effect. In addition, it can also prevent the occurrence of turbulent dead zones during the circulation of the cooling water in the water-cooling cavity 103, which affects the cooling effect, and can also act as a reinforcing rib for the inner wall 102 of the tube.

[0040] In some embodiments, double helical threads are provided on the outer wall surface of the turbulator posts 6.

[0041] The design of the double helical threads on the outer wall surface of the turbulator posts 6 can generate a rotational flow around the turbulator posts 6. This flow can not only enhance the turbulence degree of the cooling water, but also destroy the thermal boundary layer through the rotational flow effect, thereby improving the heat exchange efficiency.

[0042] In some embodiments, the cooling and exhaust system 100 applicable to the combustion chamber performance test bench of the present invention includes a spray cooling pipe 7 and a spray head 8. The inlet end of the spray cooling pipe 7 is communicated with the flue gas outlet 202 of the inner liner pipe 2, and the spray head 8 is arranged in the spray cooling pipe 7 and is used for spraying a coolant towards the flue gas flowing through the spray cooling pipe 7.

[0043] As Figure 4 shown, by spraying a coolant towards the flue gas flowing through the spray cooling pipe 7 through the spray head 8, the temperature of the flue gas can be reduced by the endothermic vaporization of water, which can quickly reduce the temperature of the flue gas, improve the cooling efficiency, and effectively ensure that the downstream back pressure valve and the exhaust tower work within a reasonable temperature range.

[0044] In some embodiments, the cooling and exhaust system 100 applicable to the combustion chamber performance test bench of the present invention further includes an axial flow valve 9, and the inlet end of the axial flow valve 9 is communicated with the outlet end of the spray cooling pipe 7.

[0045] As Figure 5 shown, the main function of the axial flow valve 9 is to control the flow rate of the flue gas flowing from the spray cooling pipe 7 to the exhaust pipe. By adjusting the opening degree of the axial flow valve 9, the emission rate of the flue gas can be accurately controlled to meet different test conditions and emission requirements.

[0046] In some embodiments, the cooling exhaust system 100 applicable to the combustion chamber performance test bench of the present invention further includes a movable exhaust pipe 10 and a fixed exhaust pipe 11. The inlet end of the movable exhaust pipe 10 is communicated with the outlet end of the axial flow valve 9, the outlet end of the movable exhaust pipe 10 is communicated with the inlet end of the fixed exhaust pipe 11, the movable exhaust pipe 10 and the fixed exhaust pipe 11 are coaxially arranged, and the movable exhaust pipe 10 is movably connected to the fixed exhaust pipe 11 along its axial direction.

[0047] The axial mobility of the movable exhaust pipe 10 helps to release the thermal deformation of the pipeline caused by temperature changes, thereby reducing the thermal stress borne by the pipeline, protecting the exhaust pipe and the connection parts from damage, and improving the use safety.

[0048] In some embodiments, the cooling exhaust system 100 applicable to the combustion chamber performance test bench of the present invention further includes a moving bracket 12 and an electric push rod 13. The moving bracket 12 is arranged below the movable exhaust pipe 10 to drive the movement of the movable exhaust pipe 10, and the electric push rod 13 is arranged between the movable exhaust pipe 10 and the fixed exhaust pipe to push the movable exhaust pipe 10 to move.

[0049] As Figure 5 shown, the moving bracket 12 is located below the movable exhaust pipe 10 and is used to support and drive the movement of the movable exhaust pipe 10. The electric push rod 13 device is located between the movable exhaust pipe 10 and the fixed exhaust pipe 11 and is used to drive the movement of the movable exhaust pipe 10. By the telescopic movement of the electric push rod 13, the position of the movable exhaust pipe 10 can be accurately controlled. The use of the electric push rod 13 can realize the automatic or remote control of the movable exhaust pipe 10, improve the overall automation level of the system, and reduce the need for manual operation. The design of the moving bracket 12 and the electric push rod 13 enables the exhaust pipe system to be quickly adjusted to adapt to different test configurations, enhancing the flexibility of the system. The precise control ability of the electric push rod 13 ensures that the movable exhaust pipe 10 can accurately reach the required position, which is very important for ensuring the accuracy of test results.

[0050] In some embodiments, the cooling exhaust system 100 applicable to the combustion chamber performance test bench of the present invention further includes an open-hole diffuser 14, and the open-hole diffuser 14 is arranged at the outlet end of the fixed exhaust pipe 11 for decelerating and reducing the noise of the flue gas discharged from the fixed exhaust pipe 11, and then discharging it into the silencing tower.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0052] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0053] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0055] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0056] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A cooling exhaust system suitable for a combustion chamber performance test bench, characterized in that: include: A water-cooling sleeve (1), the water-cooling sleeve (1) comprising an outer tube wall (101) and an inner tube wall (102), a water-cooling cavity (103) being defined between the outer tube wall (101) and the inner tube wall (102), and a water inlet (104) and a water outlet (105) being provided on the outer tube wall (101) and being in communication with the water-cooling cavity (103); An inner lining tube (2), the inner lining tube (2) being arranged in the inner wall (102) of the water-cooling jacket (1) and the two ends of the inner lining tube (2) being respectively sealedly connected to the inner wall (102) of the water-cooling jacket (1), a smoke cavity (3) being defined between the inner lining tube (2) and the inner wall (102) of the water-cooling jacket (1), a smoke hole being arranged on the side wall of the inner lining tube (2) and communicating with the smoke cavity (3), the two end ports of the inner lining tube (2) being respectively a smoke inlet (201) and a smoke outlet (202), the smoke inlet (201) being used to be connected to the outlet of the combustion chamber test piece (200); A smoke sampling device (4) is provided at the smoke outlet (202) of the inner liner tube (2) and is used for sampling the smoke discharged from the smoke outlet (202).

2. The cooling exhaust system suitable for a combustion chamber performance test bench according to claim 1, characterized in that: The length of the water-cooling jacket (1) is greater than or equal to 3 m.

3. The cooling exhaust system suitable for a combustion chamber performance test bench according to claim 1, characterized in that: It comprises a support rod (5), and the outer wall (101) and inner wall (102) of the water-cooling sleeve (1) respectively have a first through hole and a second through hole for the support rod (5) to pass through, one end of the support rod (5) passes through the first through hole and the second through hole in sequence, extends into the smoke cavity (3) and is connected to the inner liner tube (2), and the support rod (5) is respectively connected to the outer wall (101) and inner wall (102) of the water-cooling sleeve (1).

4. The cooling exhaust system suitable for a combustion chamber performance test bench according to claim 1, characterized in that: The inner wall (102) of the tube is provided with a spoiler column (6) located in the water cooling cavity (103), and the spoiler column (6) extends in the radial direction of the water cooling sleeve (1).

5. The cooling exhaust system suitable for a combustion chamber performance test bench according to claim 4, characterized in that: The outer wall surface of the spoiler column (6) is provided with a double helical thread.

6. The cooling exhaust system for a combustion chamber performance test bench according to claim 1, characterized in that: It comprises a spray cooling pipe (7) and a nozzle (8), wherein the inlet end of the spray cooling pipe (7) is connected to the smoke outlet (202) of the inner liner pipe (2), and the nozzle (8) is arranged in the spray cooling pipe (7) and is used to spray cooling liquid toward the smoke flowing through the spray cooling pipe (7).

7. The cooling exhaust system suitable for a combustion chamber performance test bench according to claim 6, characterized in that: It also includes an axial flow valve (9), the inlet end of the axial flow valve (9) is connected to the outlet end of the spray cooling pipe (7).

8. The cooling exhaust system suitable for a combustion chamber performance test bench according to claim 7, characterized in that: The invention also comprises a movable exhaust pipe (10) and a fixed exhaust pipe (11), wherein the inlet end of the movable exhaust pipe (10) is connected to the outlet end of the axial flow valve (9), and the outlet end of the movable exhaust pipe (10) is connected to the inlet end of the fixed exhaust pipe (11), the movable exhaust pipe (10) and the fixed exhaust pipe (11) are coaxially arranged, and the movable exhaust pipe (10) is movably connected to the fixed exhaust pipe (11) along its axial direction.

9. The cooling exhaust system suitable for a combustion chamber performance test bench according to claim 8, characterized in that: It also includes a movable bracket (12) and an electric push rod (13), wherein the movable bracket (12) is arranged below the movable exhaust pipe (10) to drive the movable exhaust pipe (10) to move, and the electric push rod (13) is arranged between the movable exhaust pipe (10) and the fixed exhaust pipe (11) to push the movable exhaust pipe (10) to move.

10. The cooling exhaust system suitable for a combustion chamber performance test bench according to claim 9, characterized in that: It also comprises an open-hole diffuser (14), which is arranged at the outlet end of the fixed exhaust pipe (11) and is used to reduce the speed and noise of the smoke discharged from the fixed exhaust pipe (11).

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