A cooling ring structure with uniform inner cooling liquid film and a processing method thereof

Abstract

The present application relates to a kind of high-pressure combustion chamber cooling structure of liquid rocket engine, specifically to a kind of cooling ring structure of uniform inner cooling liquid film and its processing method, solve the quality problem such as existing technology in combustion chamber inner cooling liquid film exists spread instability, uneven, loss fast, lead to the poor cooling effect of combustion chamber inner wall, shorter service life, it is difficult to realize the technical problem of reliable cooling of high-pressure combustion chamber inner wall.The cooling ring structure includes cooling ring and ring cover;Cooling ring includes base ring, first connecting ring, second connecting ring and third connecting ring;Outlet ring gap and groove are used to discharge liquid propellant in inner annular cavity and make it rotate on the inner wall of combustion chamber convergence section and form inner cooling liquid film.The method of the present application can reduce the damage caused by the direct impact of upstream main flow gas on the inner cooling liquid film, avoid the chemical reaction between the inner cooling liquid film and the gas, protect the continuity of the inner cooling liquid film at the outlet ring gap, and enhance the cooling effect.

Description

Technical Field

[0001] This invention relates to a cooling structure for a high-pressure combustion chamber of a liquid rocket engine, specifically to a cooling ring structure with a uniform internal coolant film and its processing method. Background Technology

[0002] Liquid rocket engines typically use a specific liquid propellant as an internal coolant film in the high-pressure combustion chamber to actively cool the inner wall of the high-pressure combustion chamber, which is subjected to high pressure, high heat flux, and combustion gas scouring. In order to ensure reliable cooling of the inner wall of the high-pressure combustion chamber, the internal coolant film usually requires a reasonable swirling flow velocity and uniformity of the internal coolant film in the circumferential direction.

[0003] Existing technologies for cooling the internal coolant film of the high-pressure combustion chamber wall either employ direct current small orifices to form axial film flow by impacting the wall, or use multiple parts assembled to form tangential flow through a certain width of circumferential gap. This results in the uniformity of the internal coolant film being affected by factors such as orifice diameter variation, impact angle accuracy, and uneven circumferential gap width. Consequently, the internal coolant film spreads unevenly, is unstable, and is quickly worn away, leading to poor quality issues. This, in turn, results in poor cooling effect and short service life for the high-pressure combustion chamber wall, making it difficult to achieve reliable cooling of the combustion chamber wall. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problems in the prior art, such as unstable and uneven spread of the coolant film in the combustion chamber, rapid loss, poor cooling effect and short service life of the combustion chamber wall, and difficulty in achieving reliable cooling of the high-pressure combustion chamber wall. The invention provides a cooling ring structure with a uniform internal coolant film and its processing method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A cooling ring structure with a uniform internal coolant film, characterized in that it includes a cooling ring and a ring cap; The cooling ring includes a base ring, a first connecting ring disposed at one end of the base ring, and a second connecting ring and a third connecting ring disposed at the other end of the base ring and arranged sequentially from the outside to the inside. The end of the first connecting ring away from the base ring is used to connect to the cylindrical section of the combustion chamber. The end of the second connecting ring away from the base ring is used to connect to the converging section of the combustion chamber. The cooling ring, the cylindrical section of the combustion chamber, and the converging section of the combustion chamber are coaxially arranged. The ring cover is coaxially sleeved on the outer wall of the cooling ring, and an outer annular cavity is formed between the ring cover, the base ring, and the second connecting ring; an inlet nozzle is provided on the outer wall of the ring cover, which is used to introduce liquid propellant into the outer annular cavity; The combustion chamber convergent section near the base ring has N protrusions evenly distributed around its circumference, with grooves formed between adjacent protrusions; an inner annular cavity is formed between the combustion chamber convergent section, the protrusions, the base ring, the second connecting ring, and the third connecting ring; N is 60~90; The second connecting ring has K tangential holes evenly distributed around its circumference. The tangential holes are used to introduce the liquid propellant from the outer annular cavity into the inner annular cavity. The value of K is 36~60. The end of the third connecting ring away from the base ring is set as an inclined surface to form a first inclination angle. An outlet annular slit is formed between the inclined surface and the protruding end. The outlet annular slit and the groove are used to discharge the liquid propellant in the inner annular cavity and make it rotate on the inner wall of the converging section of the combustion chamber to form an inner coolant film.

[0006] Furthermore, a boss is formed between the inner wall of the third connecting ring and the inner wall of its corresponding protrusion, with a boss height of H, where H ranges from 0.5 mm to 2 mm.

[0007] Furthermore, it also includes a fourth connecting ring and a positioning ring; One end of the fourth connecting ring is connected to the second connecting ring, and a positioning shoulder is formed at the connection between the fourth connecting ring and the second connecting ring; The positioning ring is set on the outer wall of the combustion chamber convergent section, and the positioning ring cooperates with the positioning shoulder to fix the position of the cooling ring and the combustion chamber convergent section.

[0008] Furthermore, the first inclination angle is the angle θ between the inclined surface and the inner wall of the high-pressure combustion chamber, and its value is 60° to 70°. The width B of the outlet circumferential seam is 0.3mm to 0.7mm; The angle between the central axis of the groove and the circumferential tangent of the corresponding high-pressure combustion chamber wall is the second inclination angle β, which takes the value of 25° to 35°.

[0009] Furthermore, there are 50 tangential holes; There are 36 protrusions; The first tilt angle is 60°; the second tilt angle β is 35°; There are two mouthpieces.

[0010] Meanwhile, the present invention also provides a method for processing the above-mentioned cooling ring structure with a uniform internal coolant film, which is characterized by including the following steps: 1) Machining the base ring and the first connecting ring; 2) Machining the third connecting ring and the first tilt angle; 3) Machining N protrusions near the end of the base ring in the converging section of the combustion chamber; N is 60 to 90; 4) Calculate the distance between the end of the second connecting ring furthest from the base ring and the shortest point at the end of the third connecting ring furthest from the base ring, and machine the second connecting ring according to L1; 5) Based on the given internal coolant film flow rate and injection pressure drop, calculate the diameter of the tangential holes using the flow rate-pressure drop characteristic formula, and machine K tangential holes on the second connecting ring, with K ranging from 36 to 60. 6) Machining a fourth connecting ring on the second connecting ring.

[0011] Furthermore, step 3) specifically involves: 3.1】Made N protrusions near the end of the base ring of the converging section of the combustion chamber according to the second tilt angle β; 3.2】A positioning ring is machined on the converging section of the combustion chamber to obtain the distance L between the end of the positioning ring near the second connecting ring and the protruding end.

[0012] Further, step 4) specifically involves: 4.1】Based on the width B of the outlet ring gap between the end face of the third connecting ring away from the base ring and the protruding end, the first inclination angle θ obtained in step 2), and the distance L obtained in step 3.2】, the distance L1 between the end face of the second connecting ring away from the base ring and the shortest position of the end face of the third connecting ring away from the base ring can be calculated. 4.2】The second connecting ring is machined based on the shortest position of the third connecting ring away from the end face of the base ring and the distance L1 obtained in step 4.1】.

[0013] Furthermore, in step 2), the first tilt angle θ is 60° to 70°; In step 3.1, the second tilt angle β is 25° to 35°; the number of protrusions is 36. In step 4.1, the width B of the outlet annular gap is 0.3mm to 0.7mm. In step 5), there are 50 tangential holes.

[0014] Furthermore, the protrusion, the positioning ring, and the converging section of the combustion chamber are integrally formed; The aforementioned base ring, first connecting ring, second connecting ring, third connecting ring, and fourth connecting ring are manufactured as a single unit.

[0015] The beneficial effects of this invention are: 1. The present invention provides a cooling ring structure with a uniform internal coolant film. It utilizes K tangential holes evenly distributed along the circumference of the outer annular cavity, the inner annular cavity, and the second connecting ring in the cooling ring, as well as a groove added to the outlet annular seam for injection. The pressure drop through the tangential holes allows the liquid propellant to maintain a high tangential flow velocity. The high tangential flow velocity is beneficial to maintaining a high swirling velocity of the internal coolant film in the outlet annular seam and a good wall-adhering spreading effect, which can achieve stable cooling of the inner wall of the high-pressure combustion chamber.

[0016] 2. The present invention provides a cooling ring structure with a uniform internal coolant film. A first inclination angle is provided at the end of the third connecting ring away from the base ring, and an outlet ring seam and a boss are formed between the end face of the third connecting ring away from the base ring and the protruding end. The first inclination angle and the outlet ring seam improve the uniformity of the internal coolant film spreading in the high-pressure combustion chamber, enhance the morphology of the internal coolant film and its ability to resist interference from the central high-temperature combustion gas flow, thereby reducing momentum loss by 10% (i.e., under the same flow rate and velocity, the length of the internal coolant film under the attack of the central high-temperature combustion gas increases by 10%), and the internal coolant film has a better wall-mounted rotating cooling effect.

[0017] 3. The present invention provides a cooling ring structure with uniform internal coolant film. By utilizing the structure of N second inclination angles β and the outlet ring gap width B, the circumferential uniformity of the internal coolant film flow is improved. The circumferential internal coolant film flow non-uniformity coefficient (the ratio of the maximum / minimum flow in the circumferential unit area) is reduced from 2 to less than 1.2, thereby increasing the service life of the high-pressure combustion chamber.

[0018] 4. The present invention provides a cooling ring structure with uniform internal coolant film. For liquid propellant, it adopts independent dual inlets (i.e., two inlet nozzles) and uniform flow in the outer and inner annular cavities, which improves circumferential uniformity compared to single inlet nozzle injection.

[0019] 5. The present invention discloses a processing method for a cooling ring structure with a uniform internal coolant film. The connection structure between the combustion chamber convergent section and the cooling ring adopts a precision fitting method. The distance between the shortest position of the end of the second connecting ring away from the base ring and the end of the third connecting ring away from the base ring is calculated. This ensures the protrusion distance between the tangent of the end of the third connecting ring away from the base ring near the inner wall of the high-pressure combustion chamber and the tangent of its corresponding protrusion near the inner wall of the high-pressure combustion chamber. This reduces the entrainment damage caused by the direct impact of the upstream mainstream combustion gas on the internal coolant film, avoids premature chemical reaction between the internal coolant film and the combustion gas, protects the continuity of the internal coolant film at the outlet ring seam, and enhances the cooling effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an embodiment of a cooling ring structure with a uniform internal coolant film according to the present invention; Figure 2 This is a schematic diagram of the cooling ring structure in an embodiment of a cooling ring structure with a uniform internal coolant film according to the present invention; Figure 3 This is a partial structural schematic diagram of the converging section of the combustion chamber in an embodiment of a cooling ring structure with a uniform internal coolant film according to the present invention. Figure 4 This is a schematic diagram of a partial installation structure of the cooling ring and the converging section of the combustion chamber in an embodiment of a cooling ring structure with a uniform internal coolant film according to the present invention. Figure 5This is a partial structural schematic diagram of the cooling ring in an embodiment of a cooling ring structure with a uniform internal coolant film according to the present invention; Figure 6 This is a partial structural diagram of a cooling ring structure with a uniform internal coolant film, as described in an embodiment of the present invention, showing a protruding end face in the converging section of the combustion chamber.

[0021] Explanation of reference numerals in the attached figures: 1-Cooling ring, 11-Base ring, 12-First connecting ring, 13-Second connecting ring, 14-Third connecting ring, 15-Fourth connecting ring, 16-Outer annular cavity, 17-Inner annular cavity, 2-Ring cover, 3-Cylindrical section of combustion chamber, 4-Converging section of combustion chamber, 41-Protrusion, 42-Groove, 43-Positioning ring, 5-Inlet nozzle, 6-Tangential hole, 7-Outlet annular seam. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figure 1 , Figure 2 As shown, a cooling ring structure with a uniform internal coolant film includes a cooling ring 1 and a ring cover 2. The cooling ring 1 includes a base ring 11, a first connecting ring 12 disposed at one end of the base ring 11, and a second connecting ring 13, a third connecting ring 14, and a fourth connecting ring 15 disposed at the other end of the base ring 11 and arranged sequentially from the outside to the inside. The end of the first connecting ring 12 away from the base ring 11 is used to connect to the cylindrical section 3 of the combustion chamber. The end of the second connecting ring 13 away from the base ring 11 is used to connect to the converging section of the combustion chamber. One end of the fourth connecting ring 15 is connected to the second connecting ring 13, and a positioning shoulder is formed at the connection between the fourth connecting ring 15 and the second connecting ring 13. The cooling ring 1, the cylindrical section 3 of the combustion chamber, and the converging section 4 of the combustion chamber are coaxially arranged. The ring cover 2 is coaxially sleeved on the outer wall of the cooling ring 1, and the ring cover 2, the base ring 11, and the second connecting ring 13 form an outer annular cavity 16; two inlet nozzles 5 are provided on the outer wall of the ring cover 2, and the inlet nozzles 5 are used to introduce liquid propellant into the outer annular cavity 16. like Figure 3As shown, 36 protrusions 41 and positioning rings 43 are evenly distributed along the circumference of the end of the combustion chamber converging section 4 near the base ring 11, and a groove 42 is formed between adjacent protrusions 41; an inner annular cavity 17 is formed between the combustion chamber converging section 4, the protrusions 41, the base ring 11, the second connecting ring 13 and the third connecting ring 14; the positioning ring 43 is disposed on the outer wall of the combustion chamber converging section 4, and the positioning ring 43 is connected to the positioning shoulder to fix the position of the cooling ring 1 and the combustion chamber converging section 4.

[0024] The second connecting ring 13 has 50 tangential holes 6 evenly distributed around its circumference. The tangential holes 6 are used to introduce the liquid propellant from the outer annular cavity 16 into the inner annular cavity 17. The end of the third connecting ring 14 away from the base ring 11 is set as an inclined surface to form a first inclination angle. An outlet annular slit 7 is formed between the inclined surface and the end of the protrusion 41. The outlet annular slit 7 and the groove 42 are used to discharge the liquid propellant in the inner annular cavity 17 and make it rotate on the inner wall of the combustion chamber convergent section 4 to form an inner coolant film.

[0025] The coolant film in the high-pressure combustion chamber is typically located downstream of the injector or near the cylindrical section 3 and the converging section 4 of the combustion chamber. The coolant enters sequentially from the inlet nozzle 5 into the outer annular cavity 16, the tangential orifice 6, and the inner annular cavity 17, then exits through the outlet annular slit 7 in a high-speed swirling manner, forming a wall-mounted, rotating inner coolant film that cools the high-heat-flux converging section 4 of the combustion chamber. The cooling ring 1 structure of this invention, through optimization and experimental comparison, eliminates the problems of unstable and uneven internal coolant film spreading.

[0026] A boss is formed between the inner wall of the third connecting ring 14 and the inner wall of its corresponding protrusion 41. The height of the boss is H, which is 2mm. The distance between the end face of the third connecting ring 14 away from the base ring 11 and the protrusion 41 is the width of the outlet annular gap 7, which is 0.4mm. The first inclination angle is the angle θ between the inclined surface and the inner wall of the high-pressure combustion chamber, which is 60°. The angle between the central axis of the groove 42 and the circumferential tangent of the inner wall of the corresponding high-pressure combustion chamber is the second inclination angle β, which is 35°.

[0027] In this embodiment, the liquid propellant enters the outer annular cavity 16 of the cooling ring 1 through the inlet nozzle 5, and then enters the inner annular cavity 17 through 50 tangential holes 6 with a relatively high pressure drop (generally not less than 0.3 MPa). It is then ejected through the outlet annular slot 7 in a high-speed swirling flow, forming a wall-adhering, rotating inner coolant film on the converging section 4 of the combustion chamber, thus cooling the converging section 4. The higher the velocity of the liquid propellant at the outlet of the tangential holes 6, the better the wall adhesion of the inner coolant film, enhancing its ability to maintain its shape and resist airflow interference, resulting in a better cooling effect.

[0028] Meanwhile, the present invention also provides a method for processing a cooling ring structure based on the above-mentioned uniform internal coolant film, comprising the following steps: 1) Machining the base ring 11 and the first connecting ring 12; 2) Machining the third connecting ring 14 and the first tilt angle; in this embodiment, the first tilt angle θ is 60°; 3) Machining the 36 protrusions 41 near the end of the base ring 11 in the converging section 4 of the combustion chamber, as detailed below: 3.1】The 36 protrusions 41 of the combustion chamber convergence section 4 near the end of the base ring 11 are machined according to the second tilt angle β; in this embodiment, the second tilt angle β is 35°; 3.2】A positioning ring 43 is machined on the converging section 4 of the combustion chamber to obtain the distance L between the end of the positioning ring 43 near the second connecting ring 13 and the end of the protrusion 41.

[0029] 4) Calculate the distance L1 between the end of the second connecting ring 13 furthest from the base ring 11 and the shortest point on the end face of the third connecting ring 14 furthest from the base ring 11, and process the second connecting ring 13 according to L1, as follows: 4.1】Based on the width B of the outlet annular gap 7 between the end face of the third connecting ring 14 away from the base ring 11 and the end of the protrusion 41, the first inclination angle θ obtained in step 2), and the distance L obtained in step 3.2】, the distance L1 between the end face of the second connecting ring 13 away from the base ring 11 and the shortest position of the end face of the third connecting ring 14 away from the base ring 11 can be calculated. The width B of the outlet annular gap 7 is 0.4mm. 4.2】The second connecting ring 13 is machined based on the shortest position of the third connecting ring 14 away from the end face of the base ring 11 and the distance L1 obtained in step 4.1】. 5) Calculate the diameter of the tangential hole 6 using the flow-pressure drop characteristic formula based on the given internal coolant film flow rate and injection pressure drop, and machine 50 tangential holes 6 on the second connecting ring 13; 6) Machining a fourth connecting ring 15 on the second connecting ring 13.

[0030] 7) Install base ring 11, first connecting ring 12, second connecting ring 13, third connecting ring 14, combustion chamber cylindrical section 3, combustion chamber converging section 4, ring cover 2 and inlet nozzle 5.

[0031] In this embodiment, the base ring 11, the first connecting ring 12, the second connecting ring 13, the third connecting ring 14, and the fourth connecting ring 15 are integrally machined to form a cooling ring 1, which allows for independent control of the internal coolant film; the protrusion 41, the positioning ring 43, and the combustion chamber convergent section 4 are integrally formed; the use of an outer annular cavity 16, an inner annular cavity 17, and tangential holes 6 for injection improves the circumferential uniformity of flow at a single inlet; such as Figure 4 , Figure 5As shown, after measuring the dimension L on the convergent section 4 of the combustion chamber, in order to ensure that the width B and accuracy of the outlet annular gap 7 reach the design theoretical value, the dimension L1 on the cooling ring 1, i.e., L+Bsinθ, is machined by matching the vehicle. This makes the groove 42 structure on the outlet annular gap 7 have a better flow uniformity than the traditional structure, which in turn significantly improves the uniformity of the internal coolant film. The circumferential internal coolant film flow non-uniformity coefficient is reduced from 2 to less than 1.2.

[0032] The distance H between the bosses should not be too large or too small. If it is too large, it can easily form a severe gas backflow vortex, damaging the internal coolant film. If it is too small, it can easily cause gas to overflow, impacting and eroding the inner wall of the high-pressure combustion chamber. It is recommended that the distance be 1 to 1.2 times the thickness of the internal coolant film. This can reduce the entrainment damage caused by the upstream mainstream gas directly impacting the internal coolant film, protect the continuity of the internal coolant film at the outlet of the outlet annular seam 7, and enhance the cooling effect. When the diameter of the high-pressure combustion chamber is greater than or equal to 150 mm, the distance H between the bosses should be set at 1 mm to 2 mm; when the diameter of the high-pressure combustion chamber is less than 150 mm, the distance H should be set at 0.5 mm to 1 mm.

[0033] like Figure 6 As shown, the width B of the outlet annular gap 7 and the first inclination angle θ determine the thickness of the inner coolant film at the outlet of the outlet annular gap 7. Typically, the width B of the outlet annular gap 7 is selected as 0.4 mm, and the first inclination angle θ is selected as 60°. The groove 42 is machined with a second inclination angle β, typically 35°, to ensure that the momentum loss of the inner coolant film is reduced by 10% (i.e., under the same flow rate and velocity, the length of the liquid film under the attack of the central high-temperature gas increases by 10%), thus improving the cooling effect.

[0034] The method of this invention eliminates the problems of unstable and uneven internal coolant film spreading. By checking the quality of the internal coolant film in a cold state, the circumferential thickness of the internal coolant film is measured by optical measurement or the circumferential non-uniformity coefficient of the internal coolant film (i.e., the maximum or minimum dynamic pressure value / average value) is measured by dynamic pressure measurement. The non-uniformity coefficient of the internal coolant film can be reduced from 2 to less than 1.2, eliminating local high-temperature hot spots and high-temperature erosion pits on the inner wall of the high-pressure combustion chamber after engine hot testing, and ensuring reliable cooling.

[0035] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A cooling ring structure with a uniform internal coolant film, characterized in that: Includes a cooling ring (1) and a ring cover (2); The cooling ring (1) includes a base ring (11), a first connecting ring (12) disposed at one end of the base ring (11), a second connecting ring (13) and a third connecting ring (14) disposed at the other end of the base ring (11) and arranged sequentially from the outside to the inside; the end of the first connecting ring (12) away from the base ring (11) is used to connect with the cylindrical section (3) of the combustion chamber; the end of the second connecting ring (13) away from the base ring (11) is used to connect with the converging section (4) of the combustion chamber; the cooling ring (1), the cylindrical section (3) of the combustion chamber and the converging section (4) of the combustion chamber are coaxially arranged; The ring cover (2) is coaxially sleeved on the outer wall of the cooling ring (1), and an outer annular cavity (16) is formed between the ring cover (2), the base ring (11), and the second connecting ring (13); an inlet nozzle (5) is provided on the outer wall of the ring cover (2), and the inlet nozzle (5) is used to introduce liquid propellant into the outer annular cavity (16); The combustion chamber converging section (4) has N protrusions (41) evenly distributed around its circumference at the end near the base ring (11), and a groove (42) is formed between adjacent protrusions (41); an inner annular cavity (17) is formed between the combustion chamber converging section (4), the protrusions (41), the base ring (11), the second connecting ring (13), and the third connecting ring (14); the value of N is 60 to 90; The second connecting ring (13) has K tangential holes (6) evenly distributed around its circumference. The tangential holes (6) are used to introduce the liquid propellant from the outer annular cavity (16) into the inner annular cavity (17). The value of K is 36 to 60. The end of the third connecting ring (14) away from the base ring (11) is set as an inclined surface to form a first inclination angle. An outlet annular slit (7) is formed between the inclined surface and the end of the protrusion (41). The outlet annular slit (7) and the groove (42) are used to discharge the liquid propellant in the inner annular cavity (17) and make it rotate on the inner wall of the combustion chamber convergent section (4) to form an inner coolant film.

2. The cooling ring structure with a uniform internal coolant film according to claim 1, characterized in that: A boss is formed between the inner wall of the third connecting ring (14) and the inner wall of its corresponding protrusion (41), with a height of H, where H ranges from 0.5 mm to 2 mm.

3. A cooling ring structure with a uniform internal coolant film according to claim 1 or 2, characterized in that: It also includes a fourth connecting ring (15) and a positioning ring (43); One end of the fourth connecting ring (15) is connected to the second connecting ring (13), and a positioning shoulder is formed at the connection between the fourth connecting ring (15) and the second connecting ring (13); The positioning ring (43) is disposed on the outer side wall of the combustion chamber convergence section (4), and the positioning ring (43) cooperates with the positioning shoulder to fix the position of the cooling ring (1) and the combustion chamber convergence section (4).

4. The cooling ring structure with a uniform internal coolant film according to claim 3, characterized in that: The first tilt angle is the angle θ between the inclined surface and the inner wall of the high-pressure combustion chamber, and its value is 60° to 70°. The width B of the outlet annular seam (7) is 0.3mm to 0.7mm; The angle between the central axis of the groove (42) and the circumferential tangent of the corresponding high-pressure combustion chamber wall is the second inclination angle β, which is 25° to 35°.

5. The cooling ring structure with a uniform internal coolant film according to claim 4, characterized in that: The number of tangential holes (6) is 50; The number of protrusions (41) is 36; The first tilt angle is 60°; the second tilt angle β is 35°; There are two inlet nozzles (5).

6. A method for processing a cooling ring structure with a uniform internal coolant film as described in any one of claims 1-5, characterized in that, Includes the following steps: 1) Machining the base ring (11) and the first connecting ring (12); 2) Machining the third connecting ring (14) and the first tilt angle; 3) Process the N protrusions (41) near the end of the base ring (11) of the converging section (4) of the combustion chamber; the value of N is 60 to 90; 4) Calculate the distance L1 between the end of the second connecting ring (13) away from the base ring (11) and the shortest position between the end of the third connecting ring (14) away from the base ring (11), and process the second connecting ring (13) according to L1; 5) Calculate the diameter of the tangential hole (6) according to the given internal coolant film flow rate and injection pressure drop using the flow rate-pressure drop characteristic formula, and process K tangential holes (6) on the second connecting ring (13), wherein the value of K is 36 to 60; 6) Machining a fourth connecting ring (15) on the second connecting ring (13).

7. The processing method of a cooling ring structure with a uniform internal coolant film according to claim 6, characterized in that, Step 3) specifically refers to: 3.1】According to the second tilt angle β, process the N protrusions (41) of the converging section (4) of the combustion chamber near the end of the base ring (11); 3.2】A positioning ring (43) is machined on the converging section (4) of the combustion chamber to obtain the distance L between the end of the positioning ring (43) near the second connecting ring (13) and the end of the protrusion (41).

8. A method for processing a cooling ring structure with a uniform internal coolant film according to claim 7, characterized in that, Step 4) specifically involves: 4.1】Based on the width B of the outlet annular gap (7) between the end face of the third connecting ring (14) away from the base ring (11) and the end of the protrusion (41), the first inclination angle θ obtained in step 2), and the distance L obtained in step 3.2】, the distance L1 between the end face of the second connecting ring (13) away from the base ring (11) and the shortest position of the end face of the third connecting ring (14) away from the base ring (11) can be calculated; 4.2】The second connecting ring (13) is machined based on the shortest position of the end face of the third connecting ring (14) away from the base ring (11) and the distance L1 obtained in step 4.1】.

9. A method for processing a cooling ring structure with a uniform internal coolant film according to claim 8, characterized in that: In step 2), the first tilt angle θ is 60° to 70°; In step 3.1, the second tilt angle β is 25° to 35°; the number of protrusions (41) is 36. In step 4.1, the width B of the outlet annular seam (7) is 0.3mm to 0.7mm; In step 5), there are 50 tangential holes (6).

10. A method for processing a cooling ring structure with a uniform internal coolant film according to claim 9, characterized in that: The protrusion (41), the positioning ring (43), and the combustion chamber convergence section (4) are integrally formed; The base ring (11), the first connecting ring (12), the second connecting ring (13), the third connecting ring (14), and the fourth connecting ring (15) are integrally formed.

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