Flame tube rear end cooling structure, combustion chamber test device, and combustion chamber test method
By designing a cooling structure at the rear end of the flame tube, and using cooling gas channels and a splash guard to isolate high-temperature combustion gases, the problems of cooling the rear end area of the flame tube and the entrainment of high-temperature combustion gases are solved, improving the service life and safety of the combustion chamber, and offering cost advantages.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- AECC COMML AIRCRAFT ENGINE CO LTD
- Filing Date
- 2024-11-29
- Publication Date
- 2026-05-29
AI Technical Summary
How to effectively cool the rear end area of the flame tube, prevent high-temperature gas from being drawn into the casing connection, avoid component overheating failure, and affect the service life and safety of the combustion chamber.
A cooling structure for the rear end of a flame tube is designed, including a flame tube mounting structure, a splash plate, and a cooling gas channel. A cooling gas film is formed by the design of the first and second channels to isolate the high-temperature gas from contact with the flame tube mounting structure and cover the component connection position. Inner and outer ring channels with different porosities are used to distribute the cavity pressure evenly and prevent high-temperature gas from being entrained into the gap.
It improves the service life and safety of components and combustion chamber testing devices, has a simplified structure, is easy to process and manufacture, has significant cost advantages, effectively prevents high-temperature gas from being drawn into the connection position, and extends the service life of components.
Smart Images
Figure CN122108622A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of aero-engine technology, and in particular to a cooling structure for the rear end of a flame tube, a combustion chamber test apparatus, and a combustion chamber test method. Background Technology
[0002] The development of aero-engine combustor technology requires technical verification through single-head, multi-head, and even full-annular combustor tests, from theoretical design to core engine / complete engine testing. Single-head combustor tests are generally used for multi-scheme selection, identifying one or more schemes with better overall performance for further testing and verification in sector-shaped and even full-annular combustors. For modern aero-engines, the average outlet temperature of the combustor can reach 2100K (and above), and the pressure can reach 4MPa (and above), making most materials unsuitable. Therefore, a cooling structure design for the rear end region of the flame tube is needed to prevent component overheating failure. Simultaneously, the inventors discovered during development that during combustor operation, high-temperature combustion gases can be entrained into the casing connection structure in the rear end region of the flame tube, severely impacting the service life and safety of components and the overall combustor.
[0003] In summary, effectively cooling the rear end region of the flame tube and preventing high-temperature combustion gases from being entrained at the casing connection point are pressing technical problems that need to be solved in this field. Through in-depth research, the inventors have proposed a flame tube rear end cooling structure, a combustion chamber testing device, and a combustion chamber testing method, aiming to at least partially solve the above technical problems. Summary of the Invention
[0004] The purpose of this disclosure is to provide a cooling structure for the rear end of a flame tube.
[0005] Another object of this disclosure is to provide a combustion chamber testing apparatus.
[0006] Another objective of this disclosure is to provide a method for testing combustion chambers.
[0007] According to one aspect of the present disclosure, a flame tube rear-end cooling structure includes: a flame tube mounting structure connected to a flame tube assembly located on an inner circumferential side and a first assembly located on an outer circumferential side; the first assembly and the second assembly are mateably connected; a splash deflector fixedly connected to the rear side of the flame tube mounting structure and having a guide surface extending perpendicular to the X direction; wherein the flame tube mounting structure has a first channel and a second channel, the outlet of the first channel being covered by the guide surface; cooling gas can pass through the first channel, impact the splash deflector, and be guided by the guide surface to form a first cooling gas film at the rear end of the flame tube mounting structure; the outlet of the second channel is located on the outer circumferential side of the outlet of the first channel, and cooling gas can pass through the second channel and cover the connection position of the first assembly and the second assembly; and radially, the second channel includes an outer ring second channel and an inner ring second channel; the porosity of the outer ring second channel is 0.1 to 0.15, and the porosity of the inner ring second channel is 2.5 to 3 times the porosity of the outer ring second channel.
[0008] The splash plate effectively blocks the contact between high-temperature gas and the flame tube mounting structure, providing cooling and protection for the flame tube mounting structure. The first channel is designed to allow cooling gas to impact and cool the splash plate, forming a first cooling gas film, further isolating and protecting components located in the rear region of the flame tube, especially the flame tube mounting structure, to avoid the adverse effects of component overheating. The second channel is designed to allow cooling gas to cover the connection point between the first and second components, preventing high-temperature gas from being drawn into the gap at the connection point, while also preventing cooling gas passing through the first channel from entering the gap. Furthermore, the gas channel design with different porosities in the inner and outer rings ensures that the connection points of the first and second components in the inner and outer rings have similar cavity pressures, preventing high-temperature gas from being drawn into the gap at the connection point due to uneven cavity pressure distribution. The flame tube rear-end cooling structure effectively improves the service life and safety of the components and the overall combustion chamber test device. Its simple and practical structure is easy to manufacture and has significant cost advantages.
[0009] In one or more embodiments of the flame tube rear end cooling structure, the flame tube mounting structure and the guide surface together define a guide outlet facing the connection position of the first component and the second component. Cooling gas passing through the first channel passes at least partially through the guide outlet to cover the connection position of the first component and the second component. By setting the guide outlet to face the connection position of the first component and the second component, the cooling gas passing through the first channel can also cover the gap at the connection position, further preventing high-temperature combustion gas from being entrained into the connection gap.
[0010] In one or more embodiments of the rear cooling structure of the flame tube, the first channel has a larger flow area than the second channel.
[0011] This design allows the cooling air path of the second channel to have a higher velocity than that of the first channel, which helps to ensure the blocking effect of the cooling air passing through the second channel and prevents high-temperature combustion gas and the cooling air passing through the first channel from being drawn into the gap at the connection position.
[0012] In one or more embodiments of the flame tube rear end cooling structure, the splash deflector includes a mounting flange; the mounting flange extends in the X direction for connecting the splash deflector to the inner circumferential side of the flame tube mounting structure, and the outlet of the first channel faces the mounting flange.
[0013] In one or more embodiments of the flame tube rear end cooling structure, the outlet of the second channel faces the inner wall of the second component, allowing cooling gas to pass through the second channel and form a second cooling gas film covering the inner wall of the second component.
[0014] In one or more embodiments of the flame tube rear end cooling structure, the flame tube rear end cooling structure is used for a combustion chamber test apparatus, the first component is used for the combustion test section casing, and the second component is used for the rear measurement section casing.
[0015] In one or more embodiments of the rear cooling structure of the flame tube, the first component and the second component are provided with a fan-shaped tubular structure with a smooth transition of the wall surface.
[0016] In one or more embodiments of the rear cooling structure of the flame tube, both the first component and the second component include mounting flanges, and the first component and the second component are fixedly connected by the mounting flanges that abut against each other.
[0017] In one or more embodiments of the flame tube rear end cooling structure, the flame tube assembly includes an inner ring wall and an outer ring wall, both of which are connected to the flame tube mounting structure; the outer ring wall, the first assembly, and the flame tube mounting structure together define a cooling gas chamber.
[0018] In one or more embodiments of the rear cooling structure of the flame tube, the second component includes a load-bearing casing assembly and a heat-resistant wall assembly.
[0019] In one or more embodiments of the rear cooling structure of the flame tube, the load-bearing casing assembly and the heat-resistant wall assembly together define a coolant chamber.
[0020] As described above, a combustion chamber test apparatus according to another aspect of this disclosure includes the aforementioned flame tube rear end cooling structure.
[0021] As described above, a combustion chamber testing method according to another aspect of this disclosure includes conducting a combustion chamber test using the combustion chamber testing apparatus described above.
[0022] In one or more embodiments of the combustion chamber testing method, the flame tube mounting structure and the splash guard are detachably connected, and the testing method includes: after one or more combustion chamber tests, removing the old splash guard that has undergone one or more combustion chamber tests from the flame tube mounting structure; and installing a new splash guard onto the flame tube mounting structure. Attached Figure Description
[0023] The above and other features, properties, and advantages of this disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features. It should be noted that these drawings are merely illustrative and are not drawn to scale, and should not be construed as limiting the scope of protection actually claimed by this disclosure, wherein:
[0024] Figure 1 This is a schematic diagram of the structure of a combustion chamber test apparatus according to one embodiment.
[0025] Figure 2 This is a schematic diagram of the combustion test section and the post-measurement section in one embodiment.
[0026] Figure 3 This is a schematic diagram of the cooling structure at the rear end of the flame tube according to one embodiment.
[0027] Figure 4 for Figure 2 The cross-sectional view of the combustion test section shown at point AA.
[0028] Figure 5 for Figure 2 The cross-sectional view of the post-measurement section shown at BB.
[0029] Figure 6 The image shows the CFD simulation results of the post-measurement segment of one embodiment.
[0030] Explanation of reference numerals in the attached figures:
[0031] 1. Rear end cooling structure of the flame tube; 11. Flame tube mounting structure; 111. First channel; 1111. Outer ring first channel; 1112. Inner ring first channel; 112. Second channel; 1121. Outer ring second channel; 1122. Inner ring second channel; 12. Splash deflector; 121. Guide surface; 122. Guide outlet; 123. Mounting flange; 13. First cooling gas film; 14. Second cooling gas film; 15. First assembly; 16. Second assembly; 161. Load-bearing casing assembly; 162. Temperature-resistant wall assembly; 163. Cooling... 17. Cooling chamber; 2. Mounting flange; 2. Combustion chamber test device; 21. Front transition section; 22. Front measuring section; 221. Inlet test sensor; 23. Combustion test section; 231. Flame tube assembly; 2311. Inner ring wall; 2312. Outer ring wall; 232. Fuel nozzle; 233. Ignition nozzle; 234. Cooling gas chamber; 235. Combustion test section casing; 24. Rear measuring section; 241. Outlet test sensor; 242. Rear measuring section casing; 25. Rear transition section; 26. Gas supply pipe; 27. Exhaust pipe. Detailed Implementation
[0032] Reference will now be made in detail to various embodiments of this disclosure, examples of which are shown in the accompanying drawings and described below. Although this disclosure will be described in conjunction with exemplary embodiments, it should be understood that this disclosure is not intended to be limited to those exemplary embodiments. Rather, this disclosure is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents, and other embodiments that may be included within the spirit and scope of this disclosure as defined by the appended claims.
[0033] In the following description, the terms “front,” “rear,” or other directional terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed and / or be implemented in a specific orientation, and therefore should not be construed as a limitation of this disclosure.
[0034] This disclosure uses specific terms to describe embodiments of the present disclosure. For example, "an embodiment" and / or "one embodiment" refers to a particular feature, structure, or characteristic associated with at least one embodiment of the present disclosure. Therefore, it should be emphasized and noted that "an embodiment" or "one embodiment" mentioned twice or more in different locations in this disclosure does not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the present disclosure can be appropriately combined.
[0035] In this disclosure, the term "X direction" refers to the main airflow direction within the flow channel; "front side" refers to the side from which the airflow originates (i.e., upstream); and "rear side" refers to the side to which the airflow terminates (i.e., downstream). The term "inner circumferential side" refers to the side closer to the interior of the structure; and "outer circumferential side" refers to the side closer to the exterior of the structure. The term "radial" refers to the direction through the axis (i.e., the diameter direction) relative to the axis; "inner ring" is the side closer to the axis; and "outer ring" is the side farther from the axis. For example, the combustion chamber test apparatus may have a pipe structure serving as a gas passage, thus distinguishing between the inner circumferential side closer to the interior of the pipe structure and the outer circumferential side closer to the exterior of the pipe structure. The combustion chamber test apparatus may also be a fan-shaped or fully annular structure, thus distinguishing between the inner and outer rings based on the axis of the fan-shaped or fully annular structure.
[0036] like Figure 1 As shown, optionally, the combustion chamber test device 2 includes a front transition section 21, a front measuring section 22, a combustion test section 23, a rear measuring section 24, and a rear transition section 25. The front transition section 21 is used to connect to the gas supply pipe 26; the front measuring section 22 includes an inlet test sensor 221 for measuring the intake air temperature and pressure upstream of the combustion test section 23; the combustion test section 23 includes a flame tube assembly 231, a fuel nozzle 232, and an ignition electrode 233; the rear measuring section 24 includes an outlet test sensor 241 for measuring the temperature, pressure, and fuel composition of the gas flow downstream of the combustion test section 23; and the rear transition section 25 is used to connect to the exhaust pipe 27.
[0037] Optionally, the front transition section 21, the front measuring section 22, the combustion test section 23, the rear measuring section 24, the rear transition section 25, the intake pipe, and the exhaust pipe 27 are all fixedly connected by mounting flanges 17; further, the mounting flanges 17 can be connected by threads.
[0038] like Figure 2 As shown, in the combustion chamber test, a portion of the upstream incoming gas enters the inner cavity of the flame tube assembly 231, mixes with fuel and burns to form high-temperature gas. When the high-temperature gas is discharged from the outlet of the flame tube assembly 231 and enters the downstream flow channel, the sudden expansion of the flow channel cross-sectional area will cause the high-temperature gas to flow and separate and form a backflow zone, which will then come into contact with the flame tube mounting structure 11 and get caught in the mating connection position, such as the connection gap between the casings, causing problems such as component overheating and failure.
[0039] refer to Figures 2 to 6 The inventors, after in-depth research, proposed a cooling structure 11 for the rear end of the flame tube. For example... Figure 3As shown, the rear cooling structure 11 of the flame tube includes: a flame tube mounting structure 11, which is connected to the flame tube assembly 231 located on the inner circumference and the first assembly 15 located on the outer circumference; the first assembly 15 and the second assembly 16 are connected in a cooperating manner; a splash deflector 12, which is fixedly connected to the rear side of the flame tube mounting structure 11 and is provided with a guide surface 121 extending perpendicular to the X direction; wherein, the flame tube mounting structure 11 is provided with a first channel 111 and a second channel 112; the outlet of the first channel 111 is covered by the guide surface 121, and the cooling gas can pass through the first channel 111, impact the splash deflector 12, and be cooled by the first channel 111. The guide surface 121 guides the formation of a first cooling gas film 13 on the rear side of the flame tube mounting structure 11; the outlet of the second channel 112 is located on the outer periphery of the outlet of the first channel 111, and the cooling gas can pass through the second channel 112 and cover the connection position of the first component 15 and the second component 16; and radially, the second channel 112 includes an outer ring second channel 1121 and an inner ring second channel 1122; the porosity of the outer ring second channel 1121 is 0.1 to 0.15, and the porosity of the inner ring second channel 1122 is 2.5 to 3 times that of the outer ring second channel 1121.
[0040] like Figure 2 , Figure 3 As shown, it can be understood that the first component 15 and the second component 16 can be a casing, but are not limited thereto; in the combustion chamber test, the first component 15 and the second component 16 are connected in a cooperative manner to form a gap at the connection position. If high-temperature combustion gas is entrained in this gap, it can easily cause structural reliability problems such as thermal stress and thermal deformation; the first component 15, the flame tube assembly 231, and the flame tube mounting structure 11 together define the cooling gas chamber 234, and the wall surface of the flame tube mounting structure 11 used to define the cooling gas chamber 234 also constitutes an orifice plate providing the opening of the first channel 111 and the second channel 112 for the passage of cooling gas; Figure 4As shown, the first channel 111 and the second channel 112 can be an array of multiple circular through holes, but are not limited thereto; for example, they can also be flow passage structures such as slits. Furthermore, both the first channel 111 and the second channel 112 are arrays of circular through holes, and the circular through holes of the first channel 111 and the second channel 112 are distributed in a one-to-one correspondence between the inner and outer circumferential sides. This design helps to improve the blocking effect of cooling air passing through the second channel 112 on cooling air passing through the first channel 111, preventing it from being drawn into the connection gap. Porosity refers to the ratio of the number of pores to the arc length of the pores. For example, the porosity of the outer ring second channel 1121 refers to the ratio of the number of pores in the second channel 1121 on one side of the outer ring to the arc length of the pores in the flame tube mounting structure 11 on the other side of the outer ring. Since the flame tube rear cooling structure 11 is a fan-shaped or full-ring structure with an axis, the outer ring side and the inner ring side based on the axis can be distinguished. The porosity design of the outer ring side and the inner ring side will affect the cavity pressure distribution at the gap between the first component 15 and the second component 16 at the connection position, thereby affecting the blocking effect on high-temperature gas. For example, when the outer ring second channel 1121 and the inner ring second channel 1122 have the same porosity, the outer ring will have a higher cavity pressure than the inner ring, and the uneven cavity pressure distribution will cause high-temperature gas to be entrained in the connection gap. Therefore, optimizing the porosity design is beneficial to have a uniform cavity pressure distribution at the gap at the connection position, which helps to prevent high-temperature gas from being entrained in it.
[0041] The splash guard effectively blocks the contact between the high-temperature gas and the flame tube mounting structure 11, thus cooling and protecting the flame tube mounting structure 11. Simultaneously, the design of the first channel 111 allows the cooling gas to impact and cool the splash guard, improving cooling efficiency and forming the first cooling gas film 13, further isolating and protecting components located in the rear end region of the flame tube, especially the flame tube mounting structure 11, preventing the adverse effects of component overheating. The second channel 112 is designed to allow the cooling gas to cover the connection point between the first component 15 and the second component 16, preventing high-temperature gas from reaching the connection point. The gas is drawn into the gap at the connection point, and it also serves to prevent the cooling gas passing through the first channel 111 from entering the gap. In addition, the gas channel design with different porosities in the inner and outer rings ensures that the connection points of the first component 15 and the second component 16 in the inner and outer rings have similar cavity pressure distributions, avoiding the high-temperature gas from being drawn into the gap at the connection point due to uneven cavity pressure distribution. The rear cooling structure 11 of the flame tube effectively improves the service life and safety of the components and the combustion chamber as a whole. The structure is simple, practical, easy to process and manufacture, and has significant cost advantages.
[0042] The flame tube mounting structure 11 can be directly or indirectly fixedly connected to the flame tube assembly 231 and the first assembly 15. For example, since the first assembly 15 and the second assembly 16 are fixedly connected, the flame tube mounting structure 11 can be directly connected to the second assembly 16 and indirectly connected to the first assembly 15. The splash deflector 12 and the flame tube mounting structure 11 are detachably connected. For example, the flame tube mounting structure 11 and the splash deflector 12 are threaded together, or the flame tube mounting structure 11 and the splash deflector 12 are welded together (the adverse effects of disassembly are negligible), which facilitates the individual replacement of the splash deflector 12 to control costs.
[0043] like Figure 3 As shown, in one or more embodiments of the flame tube rear end cooling structure 11, the flame tube mounting structure 11 and the guide surface 121 together define a guide outlet 122. The guide outlet 122 faces the connection location of the first component 15 and the second component 16. Cooling gas passing through the first channel 111 passes at least partially through the guide outlet 122 to cover the connection location of the first component 15 and the second component 16. Optionally, it may also be discharged through other outlets, for example, discharged downstream of the flame tube assembly 231 in the X direction to help reduce the backflow zone formed by the high-temperature combustion gas.
[0044] By setting the guide outlet 122 toward the connection position of the first component 15 and the second component 16, the cooling gas passing through the first channel 15 can also cover the gap at the connection position, further preventing high-temperature combustion gas from being drawn into the connection gap.
[0045] In one or more embodiments of the rear cooling structure 11 of the flame tube, the first channel 111 has a larger flow area than the second channel 112. This design allows the cooling air path of the second channel 112 to have a greater velocity than the cooling air path of the first channel 111, which helps to ensure the blocking effect of the cooling air passing through the second channel 112 and prevents high-temperature combustion gas and the cooling air passing through the first channel 111 from being entrained into the gap at the connection position.
[0046] Continue to refer to Figure 3In one or more embodiments of the flame tube rear end cooling structure 11, the splash deflector 12 includes a mounting flange 123; the mounting flange 123 extends in the X direction for connecting the splash deflector 12 to the inner circumferential side of the flame tube mounting structure 11, such a design facilitates that the splash deflector 12 fully covers the flame tube mounting structure 11 to provide cooling; at the same time, the outlet of the first channel 111 faces the mounting flange 123, such that cooling gas can flow sufficiently from the inner circumferential side of the splash deflector to the outer circumferential side.
[0047] Continue to refer to Figure 3 In one or more embodiments of the rear cooling structure 11 of the flame tube, the outlet of the second channel 112 faces the inner wall of the second component 16, allowing cooling gas to pass through the second channel 112 and form a second cooling gas film 14 covering the inner wall of the second component 16. This design facilitates the provision of cooling protection for the second component 16.
[0048] The flame tube rear end cooling structure 11 is particularly suitable for combustion chamber test apparatus 2, but is not limited thereto. The flame tube rear end cooling structure 11 provided in this disclosure can be used in any situation requiring cooling of the flame tube rear end region and preventing high-temperature combustion gas from being entrained into the casing connection location, provided that the corresponding applicable conditions are met. For example... Figure 2 As shown, in one or more embodiments of the flame tube rear end cooling structure 11, the flame tube rear end cooling structure 11 is used for the combustion chamber test device 2, the first component 15 is used for the combustion test section casing 235, and the second component 16 is used for the rear measurement section casing 242.
[0049] like Figure 4 As shown, in one or more embodiments of the flame tube rear end cooling structure 11, the first component 15 and the second component 16 are provided with fan-shaped tubular structures with smoothly transitioned walls, a design suitable for the fan-shaped multi-head combustion chamber test device 2. It is readily understood that the flame tube rear end cooling structure 11 can also be used for a single-head or full-ring combustion chamber test device 2, in which case the first component 15 and the second component 16 can be annular tubular structures.
[0050] like Figure 2 As shown, in one or more embodiments of the rear cooling structure 11 of the flame tube, both the first component 15 and the second component 16 include mounting flanges 17, which are fixedly connected by mating mounting flanges 17. In this case, the connection position of the first component 15 and the second component 16 specifically refers to the gap between the mating mounting flanges 17, in order to avoid problems such as overheating of the mounting flanges 17.
[0051] like Figure 3 , Figure 4 As shown, in one or more embodiments of the flame tube rear end cooling structure 11, the flame tube assembly 231 includes an inner ring wall 2311 and an outer ring wall 2312, both of which are connected to the flame tube mounting structure 11; the outer ring wall 2312, the first assembly 15, and the flame tube mounting structure 11 together define a cooling gas chamber 234.
[0052] like Figure 5 As shown, in one or more embodiments of the rear cooling structure 11 of the flame tube, the second component 16 includes a load-bearing casing assembly 161 and a heat-resistant wall assembly 162. This design is advantageous for coping with high operating conditions, such as an average temperature of 2100K (and above) and a pressure of 4MPa (and above) in the combustion chamber outlet area.
[0053] In one or more embodiments of the rear cooling structure 11 of the flame tube, the load-bearing casing assembly 161 and the heat-resistant wall assembly 162 together define a coolant chamber 163, which further cools the second assembly 16 by means of liquid cooling.
[0054] like Figure 6 As shown, according to CFD simulation, the highest wall temperature at the connection point of the first component 15 and the second component 16 does not exceed the long-term service temperature of the material under high temperature and high pressure conditions, which meets the design requirements.
[0055] As described above, this disclosure also provides a combustion chamber test apparatus 2, which includes the flame tube rear end cooling structure 11 described in the above embodiments.
[0056] In addition to the above, this disclosure also provides a combustion chamber test method, which includes conducting a combustion chamber test using the combustion chamber test apparatus 2 described above.
[0057] In one or more embodiments of the combustion chamber testing method, the flame tube mounting structure 11 and the splash plate 12 are detachably connected. For example, the flame tube mounting structure 11 and the splash plate 12 are threaded together, or the flame tube mounting structure 11 and the splash plate 12 may also be welded together (the adverse effects of disassembly are negligible). The testing method includes: after one or more combustion chamber tests, removing the old splash plate 11 that has undergone one or more combustion chamber tests from the flame tube 12 mounting structure; and installing a new splash plate 11 onto the flame tube mounting structure 12.
[0058] In summary, the technological advancements of this disclosure include, but are not limited to:
[0059] 1. The splash plate effectively blocks the contact between high-temperature combustion gas and the flame tube mounting structure, providing cooling and protection for the flame tube mounting structure. Simultaneously, the first channel design allows cooling gas to impact and cool the splash plate, improving cooling efficiency and forming the first cooling gas film, further isolating and protecting components located in the rear end region of the flame tube, especially the flame tube mounting structure, preventing adverse effects from component overheating. The second channel design allows cooling gas to cover the connection position between the first and second components, preventing high-temperature combustion gas from being drawn into the gap at the connection position, while also preventing cooling gas passing through the first channel from entering the gap. Furthermore, the gas channel design with different porosities in the inner and outer rings ensures a similar cavity pressure distribution at the connection position of the first and second components in the inner and outer rings, preventing high-temperature combustion gas from being drawn into the gap at the connection position due to uneven cavity pressure distribution. The flame tube rear end cooling structure effectively improves the service life and safety of the components and the combustion chamber as a whole. Its structure is simple, practical, easy to manufacture, and has significant cost advantages.
[0060] 2. By setting the guide outlet toward the connection position of the first component and the second component, the cooling gas passing through the first channel can also cover the gap at the connection position, thereby further preventing high-temperature combustion gas from being drawn into the connection gap.
[0061] 3. By designing the first channel to have a larger flow area than the second channel, the cooling air path of the second channel has a greater velocity than that of the first channel, which helps to ensure the blocking effect of the cooling air passing through the second channel and prevent high-temperature combustion gas and the cooling air passing through the first channel from being drawn into the gap at the connection position.
[0062] While this disclosure has described above with reference to preferred embodiments, it is not intended to limit the scope of this disclosure. Any changes and modifications can be made by those skilled in the art without departing from the spirit and scope of this disclosure. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this disclosure, without departing from the content of the technical solution of this disclosure, shall fall within the protection scope defined by the claims of this disclosure.
Claims
1. A cooling structure (1) for the rear end of a flame tube, characterized in that, include: The flame tube mounting structure (11) is connected to the flame tube assembly (231) located on the inner circumference side and the first assembly (15) located on the outer circumference side respectively; the first assembly (15) and the second assembly (16) are connected in a cooperative manner; A splash deflector (12) is fixedly connected to the rear side of the flame tube mounting structure (11) and is provided with a guide surface (121) extending perpendicular to the X direction; The flame tube mounting structure (11) is provided with a first channel (111) and a second channel (112); the outlet of the first channel (111) is covered by the guide surface (121), and the cooling gas can pass through the first channel (111), impact the splash plate (12), and be guided by the guide surface (121) to form a first cooling gas film (13) on the rear side of the flame tube mounting structure (11); the outlet of the second channel (112) is located on the outer periphery of the outlet of the first channel (111), and the cooling gas can pass through the second channel (112) and cover the connection position of the first component (15) and the second component (16); Furthermore, radially, the second channel (112) includes an outer ring second channel (1121) and an inner ring second channel (1122); the porosity of the outer ring second channel (1121) is 0.1 to 0.15, and the porosity of the inner ring second channel (1122) is 2.5 to 3 times the porosity of the outer ring second channel (1121).
2. The flame tube rear end cooling structure (1) as described in claim 1, characterized in that, The flame tube mounting structure (11) and the guide surface (121) together define a guide outlet (122) facing the connection position of the first component (15) and the second component (16). Cooling gas through the first channel (111) passes at least partially through the guide outlet (122) to cover the connection position of the first component (15) and the second component (16).
3. The flame tube rear end cooling structure (1) as described in claim 1, characterized in that, The first channel (111) has a larger flow area compared to the second channel (112).
4. The flame tube rear end cooling structure (1) as described in claim 1, characterized in that, The splash deflector (12) includes a mounting flange (123); the mounting flange (123) extends in the X direction for connecting the splash deflector (12) to the inner circumferential side of the flame tube mounting structure (11), and the outlet of the first channel (111) faces the mounting flange (123).
5. The flame tube rear end cooling structure (1) as described in claim 1, characterized in that, The outlet of the second channel (112) faces the inner wall of the second component (16), allowing cooling air to pass through the second channel (112) and form a second cooling air film (14) covering the inner wall of the second component (16).
6. The flame tube rear end cooling structure (1) as described in claim 1, characterized in that, The rear cooling structure (1) of the flame tube is used for the combustion chamber test device (2), the first component (15) is used for the combustion test section casing (235), and the second component (16) is used for the rear measurement section casing (242).
7. The flame tube rear end cooling structure (1) as described in claim 1, characterized in that, The first component (15) and the second component (16) are provided with a fan-shaped tubular structure with a smooth transition of the wall surface.
8. The flame tube rear end cooling structure (1) as described in claim 1, characterized in that, Both the first component (15) and the second component (16) include mounting flanges (17), and the first component (15) and the second component (16) are fixedly connected by the mounting flanges (17) that are mated to each other.
9. The flame tube rear end cooling structure (1) as described in claim 1, characterized in that, The flame tube assembly (231) includes an inner ring wall (2311) and an outer ring wall (2312), both of which are fixedly connected to the flame tube mounting structure (11); the outer ring wall (2312), the first assembly (15), and the flame tube mounting structure (11) together define a cooling gas chamber (234).
10. The flame tube rear end cooling structure (1) as described in claim 1, characterized in that, The second component (16) includes a load-bearing casing assembly (161) and a heat-resistant wall assembly (162).
11. The flame tube rear end cooling structure (1) as described in claim 10, characterized in that, The load-bearing casing assembly (161) and the heat-resistant wall assembly (162) together define a coolant chamber (163).
12. A combustion chamber test apparatus (2), characterized in that, include: The flame tube rear end cooling structure (1) as described in any one of claims 1 to 10.
13. A combustion chamber testing method, characterized in that, include: Combustion chamber tests were conducted using the combustion chamber test apparatus (2) as described in claim 12.
14. The combustion chamber testing method as described in claim 13, characterized in that, The flame tube mounting structure (11) and the splash shield (12) are detachably connected, and the test method includes: After one or more combustion chamber tests, the old splash guard (12) that has undergone one or more combustion chamber tests will be removed from the flame tube mounting structure (11); Install the new splash guard (12) onto the flame tube mounting structure (11).