A detachable sweat cooling device for the outer wall surface of a combustion chamber

Abstract

The application discloses a detachable sweating cooling device for the outer wall surface of a combustion chamber, which comprises a front flange, a rear flange and a ring-shaped fixing member; the front flange and the rear flange are detachably connected; the detachable ring-shaped fixing member is clamped between the front flange and the rear flange; the ring-shaped fixing member comprises a ring-shaped front fixing member, a ring-shaped rear fixing member and a ring-shaped porous medium; the ring-shaped front fixing member and the ring-shaped rear fixing member are detachably connected; the detachable ring-shaped porous medium is clamped between the ring-shaped front fixing member and the ring-shaped rear fixing member; the inner circumferential wall of the ring-shaped porous medium is exposed in the inner circumferential wall area of the ring-shaped fixing member; and the ring-shaped fixing member is a structure capable of inputting coolant into the ring-shaped porous medium; the scheme can solve the problem that the porous medium of the existing sweating cooling device cannot be detached or is difficult to detach.

Description

Technical Field

[0001] This invention relates to the technical field of sweating cooling devices, and particularly to a detachable sweating cooling device for the exterior wall of a combustion chamber. Background Technology

[0002] In the combustion chambers of aerospace engines such as rotating detonation engines and scramjet engines, the combustion process is accompanied by intense heat release, resulting in extremely high temperatures and heat flux densities within the combustion chamber. Furthermore, these engines face the challenge of prolonged operation. Therefore, the extreme thermal loads experienced during extended periods within aerospace engines place high demands on the thermal protection systems.

[0003] The core principle of sweating cooling technology lies in using a porous media structure attached to the combustion chamber wall. Utilizing the permeation effect of the porous media, the wall temperature is effectively reduced through the flow heat transfer and evaporation heat absorption processes of the liquid coolant within the porous medium. Furthermore, the gaseous substances produced after the coolant absorbs heat can form a low-temperature protective gas film downstream of the combustion chamber, further protecting the downstream combustion chamber wall. Therefore, sweating cooling has promising application prospects in the thermal protection technology of combustion chambers in aerospace engines such as rotating detonation engines and scramjet engines.

[0004] In the sweating cooling process of aerospace engine combustion chambers, porous media come into direct contact with the high-temperature gases. However, the material of the porous media is generally different from that of the combustion chamber walls, and the porous media has a pore structure, making it a separate component that requires a sweating cooling device to fix it to the combustion chamber. Furthermore, during prolonged operation, the porous media matrix may experience damage such as coking, breakage, or particle melting, necessitating replacement of the porous media after a period of use. Therefore, sweating cooling devices practically applied to combustion chambers need to have a porous media fixing device that can be easily disassembled and installed.

[0005] Currently, the sweating cooling device for aerospace engine combustion chambers is a complex structure with fixed and connected components. It has the problem that the structure is not removable or is difficult to disassemble. During the installation process, the porous medium is prone to displacement or misalignment, which makes it difficult to align the cooling surface of the porous medium with the wall of the combustion chamber. Furthermore, the side walls are often in direct contact with the combustion chamber and lack coolant supply. Summary of the Invention

[0006] The purpose of this invention is to provide a detachable sweating cooling device for the outer wall of a combustion chamber, so as to solve the problem that existing sweating cooling devices have porous media that are not detachable or difficult to detach.

[0007] To address the aforementioned technical problems, this invention provides a detachable sweating cooling device for the outer wall of a combustion chamber, comprising a front flange, a rear flange, and an annular fastener; the front flange and the rear flange are detachably connected, and the detachable annular fastener is clamped between the front flange and the rear flange; the annular fastener includes an annular front fastener, an annular rear fastener, and an annular porous medium, the annular front fastener and the annular rear fastener are detachably connected, the annular front fastener and the annular rear fastener clamp the detachable annular porous medium, the inner peripheral wall of the annular porous medium is exposed in the inner peripheral wall area of ​​the annular fastener, and the annular fastener has a structure that allows coolant to be introduced into the annular porous medium.

[0008] In one embodiment, the front flange has a plurality of through holes along its circumference; the rear flange has a plurality of through holes along its circumference; the plurality of through holes are respectively connected to the plurality of rear holes by detachable locking members, the locking members being installed to maintain the clamping of the front flange and the rear flange on the annular fastener.

[0009] In one embodiment, at least one of the front flange and the rear flange is provided with an annular positioning groove. The annular positioning groove is provided on the opposing surfaces of the front flange and the rear flange. The annular fixing member is embedded in the annular positioning groove, and the inner diameter of the annular positioning groove matches the outer diameter of the annular fixing member.

[0010] In one embodiment, both the annular front fixing member and the annular rear fixing member are annular plate structures. At least one of the annular front fixing member and the annular rear fixing member is provided with a protruding enclosure wall. The enclosure wall is located on the outer periphery of the opposing surfaces of the annular front fixing member and the annular rear fixing member, and the enclosure wall is arranged around the outer peripheral wall of the annular porous medium.

[0011] In one embodiment, the inner peripheral wall of the enclosure wall is separated from the outer peripheral wall of the annular porous medium to form a peripheral wall cooling cavity, and the peripheral wall cooling cavity is connected to a coolant inlet, which is connected to the outer peripheral wall of the enclosure wall.

[0012] In one embodiment, the annular front fixing member is separated from the front sidewall of the annular porous medium to form a front sidewall cooling cavity; the annular rear fixing member is separated from the rear sidewall of the annular porous medium to form a rear sidewall cooling cavity.

[0013] In one embodiment, the annular front fixing member has a front positioning annular groove on the surface opposite to the annular porous medium, and the front side of the annular porous medium is embedded in the front positioning annular groove; the annular rear fixing member has a rear positioning annular groove on the surface opposite to the annular porous medium, and the rear side of the annular porous medium is embedded in the rear positioning annular groove.

[0014] In one embodiment, one of the annular front fastener and the annular rear fastener is provided with a plurality of mounting guide holes in a circumferential direction, and the other of the annular front fastener and the annular rear fastener is provided with a plurality of mounting threaded holes in a circumferential direction; mounting bolts are inserted into the plurality of mounting guide holes, and the plurality of mounting bolts are threadedly connected to the plurality of mounting threaded holes respectively.

[0015] In one embodiment, the front flange is used to fit over the output end of the cylindrical inlet combustion chamber, and the inner diameter of the front flange is the same as the outer diameter of the cylindrical inlet combustion chamber; the rear flange is used to fit over the input end of the cylindrical tail combustion chamber, and the inner diameter of the rear flange is the same as the outer diameter of the cylindrical tail combustion chamber.

[0016] In one embodiment, the inner diameters of the front flange, the rear flange, the annular front fastener, the annular rear fastener, and the annular porous medium are the same.

[0017] The beneficial effects of this invention are as follows: 1. By using the detachable clamping of the front and rear flanges, and the detachable clamping of the porous medium by the annular front and rear fixing parts, a double detachable structure is formed. This not only enables the convenient replacement of the porous medium as an independent component, but also ensures the reliable fixation of the entire device and the combustion chamber. At the same time, the inner wall of the annular porous medium is directly exposed to the airflow channel, ensuring that the cooling surface is in full contact with the high-temperature gas, thus playing a dual role in sweating cooling and gas film protection.

[0018] 2. By setting corresponding perforations in the circumference of the front and rear flanges and using detachable locking parts for connection, the flanges achieve uniform and stable clamping of the annular fixing parts, avoiding deformation or displacement of the porous media due to uneven local force; at the same time, the locking parts can be quickly disassembled and assembled, which significantly improves the operational efficiency of device maintenance and porous media replacement.

[0019] 3. By setting an annular positioning groove on the opposite side of the flange, the annular fastener can be accurately embedded and positioned, effectively preventing radial offset or misalignment during installation, ensuring that the inner wall of the porous medium is flush with the wall of the combustion chamber flow channel, avoiding local heat concentration or airflow disturbance caused by poor alignment, and improving cooling uniformity and combustion chamber safety.

[0020] 4. By adopting an annular plate structure and adding a raised enclosure wall, a physical enclosure and protection is formed on the outer peripheral wall of the porous medium, preventing high-temperature gas from eroding the edge of the porous medium from the side. At the same time, the annular fastener enhances the wrapping and structural integrity of the porous medium, reducing the risk of the porous medium breaking or falling off under thermal shock.

[0021] 5. By forming a peripheral cooling cavity between the enclosure wall and the outer peripheral wall of the porous medium and connecting it to the coolant inlet, an independent coolant supply channel is provided for the side wall of the porous medium, which effectively solves the problem of insufficient cooling and easy overheating and ablation of the side wall of traditional devices; the coolant is evenly penetrated into the porous medium through the peripheral cooling cavity, improving the lateral cooling coverage and thermal protection reliability.

[0022] 6. By forming a sidewall cooling cavity between the front and rear fixing parts and the front and rear sidewalls of the porous medium, the direct contact area between the fixing parts and the porous medium is reduced, the heat conduction path is reduced, and the wetting and cooling effect of the coolant on the end face of the porous medium is increased, preventing the end of the porous medium from failing prematurely due to thermal stress concentration and extending its service life.

[0023] 7. By setting positioning annular grooves on the opposite surfaces of the front and rear fixing parts, the front and rear sides of the porous medium are respectively embedded in the grooves, achieving precise axial positioning and preventing the porous medium from moving or falling out of the clamping position due to vibration or thermal deformation; at the same time, the groove structure enhances the wrapping and sealing of the porous medium by the fixing parts, reducing the leakage of coolant from the side.

[0024] 8. By adopting a threaded connection method that uses mounting guide holes and mounting bolts, the annular front and rear fixing parts can be quickly aligned and tightened. The bolt connection structure is simple, reliable, and easy to disassemble and assemble, making it convenient to complete the replacement operation of porous media in a confined space. The guide hole design also plays a role in assembly guidance, preventing bolt misalignment and damage to the threads.

[0025] 9. By matching the outer diameter of the front flange with the outer diameter of the output end of the incoming combustion chamber and the outer diameter of the rear flange with the outer diameter of the input end of the tail combustion chamber, the device can be directly fitted between existing combustion chamber pipe sections without modifying the main structure of the combustion chamber. It has good compatibility and versatility, and is convenient for upgrading and modifying existing engine systems.

[0026] 10. By standardizing the inner diameter dimensions of the front flange, rear flange, annular front fastener, annular rear fastener, and annular porous medium, ensure that the inner wall surface of the assembled device is flush with the inner wall surface of the combustion chamber flow channel, eliminate steps or sudden expansion structures, avoid causing flow separation and local resistance loss, ensure smooth high-temperature mainstream flow in the combustion chamber, and facilitate continuous coverage of gas film cooling. Attached Figure Description

[0027] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the application state provided in the embodiments of the present invention; Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure; Figure 3 yes Figure 2 A magnified structural diagram of part A; Figure 4 yes Figure 3 A schematic diagram of the structure after the annular porous medium has been removed; Figure 5 A schematic diagram of the exploded structure provided in an embodiment of the present invention.

[0029] The attached figures are labeled as follows: 100. Front flange; 110. Front perforation; 120. Annular positioning groove; 200. Rear flange; 210. Rear perforation; 300. Annular fastener; 310. Annular front fastener; 311. Enclosing wall; 312. Mounting threaded hole; 313. Peripheral wall cooling cavity; 314. Coolant inlet; 315. Front side wall cooling cavity; 316. Front positioning annular groove; 320. Annular rear fastener; 321. Mounting guide hole; 322. Rear side wall cooling cavity; 323. Rear positioning annular groove; 330. Annular porous medium; 400. Circular tubular inlet section combustion chamber; 500. Circular tubular tail-end combustion chamber. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0031] In the combustion chambers of rotary detonation engines and scramjet engines, intense combustion generates extremely high temperatures and heat flux densities, and the engines need to operate for extended periods, posing a severe challenge to thermal protection systems. Sweating cooling utilizes the permeation effect of porous media on the engine walls, reducing wall temperature through coolant flow heat transfer and evaporative heat absorption. Simultaneously, the gaseous coolant, after absorbing heat, forms a protective gas film downstream, demonstrating promising application prospects.

[0032] However, in practical applications, porous media are independent components that need to be reliably fixed to the combustion chamber. After long-term operation, they are prone to damage such as coking, breakage, and particle melting, requiring periodic replacement. Current sweating cooling devices are mostly complex fixed structures, which are either non-removable or difficult to disassemble. During installation, displacement and misalignment are common, leading to poor alignment between the cooling surface and the wall surface. Simultaneously, the sidewalls are often in direct contact with high-temperature combustion gases, lacking effective cooling supply. Therefore, there is an urgent need to develop a porous media fixing device that is easy to install and remove, accurately positioned, and has cooling capabilities on the sidewalls to ensure system reliability and maintainability.

[0033] To address the aforementioned problems, this invention provides a detachable sweating cooling device for the exterior wall of a combustion chamber, such as... Figure 1 As shown, the detachable sweating cooling device in this embodiment includes a front flange 100, a rear flange 200, and an annular fastener 300. The device has an overall annular hollow structure, which facilitates coaxial connection with the circular tubular inlet combustion chamber 400 and the circular tubular tail end combustion chamber 500, ensuring that the high-temperature mainstream flows smoothly along the axial direction.

[0034] Regarding the aforementioned front flange 100 and rear flange 200, as follows: Figure 1 As shown, in this embodiment, the front flange 100 and the rear flange 200 are detachably connected, and a detachable annular fastener 300 is clamped between the front flange 100 and the rear flange 200. Both the front flange 100 and the rear flange 200 can be made of high-temperature resistant metal materials to ensure that their structural strength is sufficient to maintain stable clamping of the annular fastener 300 under high temperature and high pressure environment, and to avoid loosening of the clamping due to thermal expansion differences.

[0035] Among them, the front flange 100 and the rear flange 200 are used not only to clamp and fix the annular fastener 300, but also to fix the detachable sweating cooling device to the combustion chamber; for example, from Figure 1 As shown, when installing the front flange 100, the front flange 100 is used to fit around the output end of the cylindrical inlet combustion chamber 400. By setting the inner diameter of the front flange 100 to be the same as the outer diameter of the cylindrical inlet combustion chamber 400, a stable matching installation between the front flange 100 and the cylindrical inlet combustion chamber 400 can be achieved. Similarly, when installing the rear flange 200, the rear flange 200 is used to fit around the input end of the cylindrical tail combustion chamber 500. By setting the inner diameter of the rear flange 200 to be the same as the outer diameter of the cylindrical tail combustion chamber 500, a stable matching installation between the rear flange 200 and the cylindrical tail combustion chamber 500 can be achieved.

[0036] At this point, it is also preferable to provide sealing gaskets or high-temperature resistant sealing coatings between the front flange 100 and the output end of the cylindrical inlet combustion chamber 400, and between the rear flange 200 and the input end of the cylindrical tail combustion chamber 500, to prevent high-temperature gas from leaking out from the mating gap and improve the airtightness and safety of the device.

[0037] It should be pointed out that, from Figure 1 As shown in the diagram, the high-temperature main flow in the combustion chamber is from left to right. Therefore, the high-temperature main flow will pass through the tubular incoming section combustion chamber 400, the detachable sweating cooling device, and the tubular tail end combustion chamber 500 in sequence. Thus, the tubular incoming section combustion chamber 400 is the input end on the left and the output end on the right in the diagram. Similarly, the tubular tail end combustion chamber 500 is the input end on the left and the output end on the right in the diagram.

[0038] In addition, since the front flange 100 and the rear flange 200 are detachably connected, when the front flange 100 and the rear flange 200 are disconnected, the annular fastener 300 can be replaced, adjusted, and installed. After all operations are completed, the front flange 100 and the rear flange 200 can be connected and fixed to ensure that the annular fastener 300 can be securely clamped.

[0039] At this point, the detachable connection method allows the annular fastener 300 to be removed or installed as an independent module, which facilitates the rapid replacement of porous media during ground maintenance or on-site emergency repairs, significantly reducing engine downtime.

[0040] Obviously, there are no special restrictions on the connection method between the front flange 100 and the rear flange 200, as long as they can switch between two states: separation and fixed connection. In this embodiment, however, the following method is adopted. Figure 5 In the configuration shown, the front flange 100 has multiple front through holes 110 along its circumference, and the rear flange 200 has multiple rear through holes 210 along its circumference. Through the cooperation of the front through holes 110, the rear through holes 210, and other components, the switching between the two states can be achieved.

[0041] Specifically, multiple front through holes 110 can be connected to multiple rear through holes 210 with detachable locking components, so that the installation of the locking components can be used to maintain the clamping of the front flange 100 and the rear flange 200 on the annular fastener 300.

[0042] It should be noted that the implementation of this locking component is not unique; it can at least have the following implementation methods: 1. The locking component is set as a screw, and both the front through hole 110 and the rear through hole 210 are threaded holes. Therefore, by connecting the locking component with the front through hole 110 and the rear through hole 210 by thread, a detachable connection between the front flange 100 and the rear flange 200 can be achieved. The threaded connection method has a simple structure, strong load-bearing capacity, and is not easy to loosen in the high-frequency vibration environment, making it suitable for the harsh working conditions of aerospace engines.

[0043] 2. Alternatively, both the front through hole 110 and the rear through hole 210 can be made into smooth holes. A locking component can be installed by connecting a nut after passing through the front through hole 110 and the rear through hole 210, which can achieve a detachable connection between the front flange 100 and the rear flange 200. The bolt and nut connection method is convenient for adjusting the clamping preload, and the cost of replacing bolts is low, making it suitable for maintenance scenarios with frequent disassembly and assembly.

[0044] Of course, the detachable connection method of the front flange 100 and the rear flange 200, as well as the implementation method of the locking component, are not limited to those described above. Those skilled in the art can make appropriate adjustments and selections according to their needs, which will not be described here.

[0045] Furthermore, to achieve rapid alignment and stable installation of the ring-shaped fastener 300, such as... Figure 1 , Figure 4 and Figure 5 As shown, in this embodiment, an annular positioning groove 120 is provided on the front flange 100. The annular positioning groove 120 is provided on the surface of the front flange 100 and the rear flange 200 opposite to each other. An annular fixing member 300 is embedded in the annular positioning groove 120, and the inner diameter of the annular positioning groove 120 matches the outer diameter of the annular fixing member 300.

[0046] Specifically, the annular positioning groove 120 is arranged around the hollow part of the inner ring of the front flange 100. Therefore, after the front flange 100 is installed securely, the annular fastener 300 can be directly embedded into the annular positioning groove 120 to play a preliminary positioning role. This allows operators to accurately place the annular fastener 300 without relying on complex measuring tools, greatly reducing the installation difficulty and time cost, thereby achieving rapid alignment and installation of the annular fastener 300. Moreover, since the inner diameter of the annular positioning groove 120 matches the outer diameter of the annular fastener 300, the installed annular fastener 300 cannot be offset, further ensuring that the installation of the annular fastener 300 is firm and accurate.

[0047] It should be noted that the location and number of the annular positioning groove 120 are not limited to the above-mentioned arrangement. Those skilled in the art can make appropriate adjustments and selections according to their needs. For example, it is sufficient to ensure that at least one of the front flange 100 and the rear flange 200 is provided with an annular positioning groove 120, and that the annular positioning groove 120 is provided on the opposite surfaces of the front flange 100 and the rear flange 200.

[0048] For example, in some embodiments, annular positioning grooves 120 can be provided on both the front flange 100 and the rear flange 200 to form a front and rear dual positioning structure, which further improves the axial and radial positioning accuracy of the annular fastener 300.

[0049] Regarding the aforementioned annular fastener 300, as Figure 1 and Figure 3 As shown, this embodiment provides an annular fastener 300 including an annular front fastener 310, an annular rear fastener 320, and an annular porous medium 330. The annular front fastener 310 and the annular rear fastener 320 are detachably connected. The annular porous medium 330 is sandwiched between the annular front fastener 310 and the annular rear fastener 320. The inner peripheral wall of the annular porous medium 330 is exposed in the inner peripheral wall area of ​​the annular fastener 300, and the annular fastener 300 is a structure that allows coolant to be introduced into the annular porous medium 330.

[0050] At this time, the annular front fastener 310 and the annular rear fastener 320 can also be made of high-temperature resistant metal material, and their thermal expansion coefficient is matched with that of the annular porous medium 330, so as to reduce the interface stress and gap caused by the difference in thermal expansion under high temperature conditions, and ensure that the coolant will not leak a large amount from the interface between the fastener and the porous medium.

[0051] Among them, the aforementioned annular front fastener 310 is mainly used to achieve the mating installation with the front flange 100, the annular rear fastener 320 is mainly used to achieve the mating installation with the rear flange 200, and the mutual mating of the annular front fastener 310 and the annular rear fastener 320 is mainly used to achieve the installation and fixation of the annular porous medium 330.

[0052] Therefore, the annular front fastener 310 and the annular rear fastener 320 must securely clamp the annular porous medium 330 and ensure that the inner peripheral wall of the annular porous medium 330 is exposed within the inner peripheral wall area of ​​the annular fastener 300.

[0053] At this point, the exposed width of the inner peripheral wall of the annular porous medium 330 is the effective cooling width in contact with the high-temperature mainstream of the combustion chamber. This width can be designed according to the heat flux density and coolant flow rate of the combustion chamber to ensure that the wall temperature is always lower than the allowable temperature of the material under rated operating conditions.

[0054] To achieve this goal, such as Figure 3 and Figure 5 As shown, in this embodiment, both the annular front fixing member 310 and the annular rear fixing member 320 are annular plate structures. The annular front fixing member 310 is provided with a protruding enclosure wall 311. The enclosure wall 311 is located on the outer periphery of the surfaces of the annular front fixing member 310 and the annular rear fixing member 320, and the enclosure wall 311 is arranged around the outer periphery of the annular porous medium 330.

[0055] by Figure 3 The directions shown are for reference. Once the annular front fastener 310, the annular rear fastener 320, and the annular porous medium 330 are assembled in place, the right side wall of the annular front fastener 310 will fit against the left side wall of the annular porous medium 330, and the left side wall of the annular rear fastener 320 will fit against the right side wall of the annular porous medium 330, thereby achieving a stable clamping of the annular porous medium 330. The enclosure wall 311 can then enclose and protect the outer peripheral wall of the annular porous medium 330.

[0056] Furthermore, in the clamping state, the annular porous medium 330 is subjected to a certain pre-tightening force along the axial direction by the front and rear fixing members. This pre-tightening force is sufficient to prevent the annular porous medium 330 from moving relative to each other under vibration, but it is not too large and will cause the annular porous medium 330 to be damaged due to crushing.

[0057] It should be noted that the location and number of enclosure walls 311 are not limited to the above-mentioned arrangement. Those skilled in the art can make appropriate adjustments and selections according to their needs. For example, it is only necessary to ensure that at least one of the annular front fastener 310 and the annular rear fastener 320 has a protruding enclosure wall 311, and the enclosure wall 311 is located on the outer periphery of the opposing surfaces of the annular front fastener 310 and the annular rear fastener 320.

[0058] For example, in some embodiments, opposing enclosure walls 311 may be provided on the annular front fixing member 310 and the annular rear fixing member 320 at the same time, so that the two form a complete annular enclosure structure after assembly, which further enhances the wrapping and protection effect on the outer peripheral wall of the annular porous medium 330.

[0059] Furthermore, to ensure a stable clamping of the annular porous medium 330, it is necessary to ensure a secure connection between the annular front fixing member 310 and the annular rear fixing member 320. Therefore, to achieve this, this embodiment employs... Figure 5 In the setup shown, the annular front fixing member 310 is provided with multiple mounting threaded holes 312 around its circumference, and the annular rear fixing member 320 is provided with multiple mounting guide holes 321 around its circumference. Mounting bolts are inserted into the multiple mounting guide holes 321, and the multiple mounting bolts are threadedly connected to the multiple mounting threaded holes 312 respectively.

[0060] At this time, the inner diameter of the mounting guide hole 321 can be slightly larger than the outer diameter of the mounting bolt to provide a certain assembly clearance so that the bolt can be smoothly inserted; at the same time, the mounting guide hole 321 corresponds one-to-one with the mounting thread hole 312 and is arranged coaxially, which will ensure that the mounting bolt will not be deflected when screwed in, and protect the thread from damage.

[0061] With this setup, simply tightening the mounting bolts connects and secures the annular front fixing member 310 and the annular rear fixing member 320, thus achieving a stable clamping of the annular porous medium 330. Once the mounting bolts are loosened, the clamping of the annular porous medium 330 can be released without the need for special pulling tools or heating equipment, significantly simplifying the maintenance process and facilitating the replacement of the annular porous medium 330. This effectively solves the problem of existing sweating cooling devices having porous media that are either non-removable or difficult to remove.

[0062] It should be noted that the mounting threaded hole 312 and the mounting guide hole 321 are not limited to the above-mentioned setting method. Those skilled in the art can make appropriate adjustments and selections according to their needs. For example, it is sufficient to ensure that multiple mounting guide holes 321 are provided in one circumferential direction of the annular front fastener 310 and the annular rear fastener 320, and multiple mounting threaded holes 312 are provided in the other circumferential direction of the annular front fastener 310 and the annular rear fastener 320.

[0063] Furthermore, to ensure that the annular fastener 300 can supply sufficient coolant for the permeation of the annular porous medium 330, such as... Figure 3 As shown, in this embodiment, a peripheral cooling cavity 313 is formed by separating the inner peripheral wall of the enclosure wall 311 from the outer peripheral wall of the annular porous medium 330. The peripheral cooling cavity 313 is connected to a coolant inlet 314, which is connected to the outer peripheral wall of the enclosure wall 311.

[0064] In some preferred embodiments, the external port of the coolant inlet 314 is provided with an internal thread or quick-connect fitting structure to facilitate quick connection and sealing with an external coolant supply line, thereby preventing coolant leakage under high-pressure supply conditions.

[0065] With this configuration, the inner peripheral wall of the enclosure wall 311 and the outer peripheral wall of the annular porous medium 330 can be separated to form a peripheral cooling cavity 313 with a larger space. The peripheral cooling cavity 313 is an annular cavity structure that can store more coolant. Therefore, when the coolant is input into the peripheral cooling cavity 313 through the coolant inlet 314, the coolant can penetrate into the annular porous medium 330 more fully.

[0066] The coolant in the peripheral cooling cavity 313 flows radially inward under pressure, passes through the pore structure of the annular porous medium 330 and reaches its inner peripheral wall surface, thereby forming a uniform coolant film and vapor protection layer on its inner wall surface.

[0067] The peripheral cooling cavity 313 also serves to equalize and stabilize the flow of coolant. That is, after the coolant enters the cavity, it first fills the entire annular space, so that the pressure is evenly distributed along the circumference. This ensures that all areas of the annular porous medium 330 can obtain sufficient coolant supply, and avoids local cooling failure due to uneven circumferential flow distribution.

[0068] Furthermore, to reduce heat transfer to the annular porous medium 330, such as Figure 3 As shown, in this embodiment, the annular front fixing member 310 is separated from the front sidewall of the annular porous medium 330 to form a front sidewall cooling cavity 315, and the annular rear fixing member 320 is separated from the rear sidewall of the annular porous medium 330 to form a rear sidewall cooling cavity 322.

[0069] By adopting this configuration, not only is the contact between the front and rear sidewalls of the annular porous medium 330 and other components reduced, making it more difficult for heat to be transferred to the annular porous medium 330, but the weight of the annular front fastener 310 and the annular rear fastener 320 can also be reduced.

[0070] It should be noted that this embodiment also employs Figure 3 and Figure 4 In the arrangement shown, the annular front fixing member 310 and the annular porous medium 330 have a front positioning annular groove 316 on their opposite surfaces, and the front side of the annular porous medium 330 is embedded in the front positioning annular groove 316; while the annular rear fixing member 320 and the annular porous medium 330 have a rear positioning annular groove 323 on their opposite surfaces, and the rear side of the annular porous medium 330 is embedded in the rear positioning annular groove 323.

[0071] It should also be noted that this embodiment also sets the inner diameter of the front flange 100, the rear flange 200, the annular front fastener 310, the annular rear fastener 320, and the annular porous medium 330 to be the same, so that after assembly, the detachable sweating cooling device and the combustion chamber can be connected into a smooth and unobstructed channel.

[0072] The consistent inner diameter ensures a smooth and continuous transition of the inner wall surface of the airflow channel in all axial sections, without any steps or abrupt changes in structure. This eliminates local pressure loss and flow separation caused by structural abrupt changes, thus ensuring that the aerodynamic performance of the high-temperature mainstream in the combustion chamber is not affected. It also facilitates the continuous coverage of the gas film formed by sweating and cooling along the wall surface, avoiding gas film peeling or vortex damage caused by step structures.

[0073] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A detachable sweating cooling device for the exterior wall of a combustion chamber, characterized in that, This includes the front flange, the rear flange, and the annular fastener; The front flange and the rear flange are detachably connected, and the detachable annular fastener is clamped between the front flange and the rear flange; The annular fastener includes an annular front fastener, an annular rear fastener, and an annular porous medium. The annular front fastener and the annular rear fastener are detachably connected. The annular porous medium is sandwiched between the annular front fastener and the annular rear fastener. The inner peripheral wall of the annular porous medium is exposed in the inner peripheral wall area of ​​the annular fastener, and the annular fastener has a structure that allows coolant to be introduced into the annular porous medium.

2. The detachable sweating cooling device according to claim 1, characterized in that, The front flange has multiple through holes along its circumference; The rear flange has multiple through holes along its circumference. Each of the plurality of front through holes is connected to a plurality of rear through holes with a detachable locking member, the locking member being installed to maintain the clamping of the front flange and the rear flange on the annular fastener.

3. The detachable sweating cooling device according to any one of claims 1 or 2, characterized in that, At least one of the front flange and the rear flange is provided with an annular positioning groove. The annular positioning groove is provided on the opposite surfaces of the front flange and the rear flange. The annular fixing member is embedded in the annular positioning groove, and the inner diameter of the annular positioning groove matches the outer diameter of the annular fixing member.

4. The detachable sweating cooling device according to claim 1, characterized in that, Both the annular front fixing member and the annular rear fixing member are annular plate structures. At least one of the annular front fixing member and the annular rear fixing member is provided with a protruding enclosure wall. The enclosure wall is located on the outer periphery of the opposing surfaces of the annular front fixing member and the annular rear fixing member, and the enclosure wall is arranged around the outer peripheral wall of the annular porous medium.

5. The detachable sweating cooling device according to claim 4, characterized in that, The inner peripheral wall of the enclosure wall is separated from the outer peripheral wall of the annular porous medium to form a peripheral wall cooling cavity. The peripheral wall cooling cavity is connected to a coolant inlet, which is connected to the outer peripheral wall of the enclosure wall.

6. The detachable sweating cooling device according to any one of claims 4 or 5, characterized in that, The annular front fixing member is separated from the front sidewall of the annular porous medium to form a front sidewall cooling cavity; The annular rear fixing member is separated from the rear sidewall of the annular porous medium to form a rear sidewall cooling cavity.

7. The detachable sweating cooling device according to claim 6, characterized in that, The annular front fixing member has a front positioning annular groove on its surface opposite to the annular porous medium, and the front side of the annular porous medium is embedded in the front positioning annular groove; The annular rear fixing member has a rear positioning annular groove on its surface opposite to the annular porous medium, and the rear side of the annular porous medium is embedded in the rear positioning annular groove.

8. The detachable sweating cooling device according to claim 1, characterized in that, One of the annular front fixing member and the annular rear fixing member is provided with multiple mounting guide holes in the circumferential direction, and the other of the annular front fixing member and the annular rear fixing member is provided with multiple mounting threaded holes in the circumferential direction. Each of the multiple mounting guide holes is fitted with a mounting bolt, and the multiple mounting bolts are threadedly connected to the multiple mounting threaded holes respectively.

9. The detachable sweating cooling device according to claim 1, characterized in that, The front flange is used to fit over the output end of the cylindrical inlet combustion chamber, and the inner diameter of the front flange is the same as the outer diameter of the cylindrical inlet combustion chamber. The rear flange is used to fit over the input end of the cylindrical tail-end combustion chamber, and the inner diameter of the rear flange is the same as the outer diameter of the cylindrical tail-end combustion chamber.

10. The detachable sweating cooling device according to any one of claims 1 or 9, characterized in that, The inner diameter of the front flange, the rear flange, the annular front fastener, the annular rear fastener, and the annular porous medium are the same.

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