Combustion chamber liquid film blowing tool and liquid film inspection method

Abstract

The present application relates to combustion chamber test tool, specifically relates to a kind of combustion chamber liquid film blowing tool and liquid film inspection method, to solve the lack of quality inspection of liquid film in the working process of prior art combustion chamber, which leads to the deficiency that high-pressure gas can blow away liquid film.The combustion chamber liquid film blowing tool includes an air inlet tool assembly and a limiting assembly, the air inlet tool assembly includes an annular housing nested in one end of the combustion chamber, an air inlet hole and a blowing hole provided on the annular housing, the annular housing is nested in one end of the combustion chamber away from the throat, including an inner housing and an outer housing, an annular cavity is formed between the inner housing and the outer housing, the air inlet hole and the blowing hole are communicated with the annular cavity, the air inlet hole is used to connect external compressed air device, and the blowing hole is arranged towards the throat of the combustion chamber or perpendicular to the side wall of the combustion chamber;The liquid film of the combustion chamber is blown away by using the combustion chamber liquid film blowing tool, and the combustion chamber is adjusted by observing the uniformity and integrity of the liquid film.

Description

TECHNICAL FIELD

[0001] The present application relates to a combustion chamber test tool, in particular to a combustion chamber liquid film blowing tool and a liquid film inspection method. BACKGROUND

[0002] The inner wall of a rocket engine combustion chamber is provided with a tangential hole for providing a cooling liquid film for the throat of the combustion chamber, and the quality of the cooling liquid film directly affects the cooling effect of the throat. The quality inspection of the cooling liquid film includes the inspection of its thickness, flow size and uniformity. During the working process of the combustion chamber, high-pressure gas may blow away the liquid film, affecting the thickness and uniformity of the cooling liquid film, thereby causing damage to the combustion chamber. Therefore, it is necessary to simulate the working state of the liquid film of the combustion chamber and inspect the quality of the liquid film. SUMMARY

[0003] The purpose of the present application is to solve the problem of lack of liquid film quality inspection in the working process of the combustion chamber in the prior art, which may cause the liquid film to be blown away by high-pressure gas. A combustion chamber liquid film blowing tool and a liquid film inspection method are provided, which can simulate and detect the uniformity of the cooling liquid film of the combustion chamber under the impact of high-pressure gas.

[0004] To achieve the above-mentioned purpose, the technical solution provided by the present application is as follows:

[0005] A combustion chamber liquid film blowing tool, characterized in that: comprising an air inlet tool assembly and a limiting assembly, the limiting assembly is used for fixing the air inlet tool assembly on the combustion chamber; the air inlet tool assembly comprises an annular shell nested in one end of the combustion chamber, an air inlet hole and a blowing hole provided on the annular shell; the annular shell is nested in one end of the combustion chamber away from the throat and comprises an inner shell and an outer shell, an annular cavity is formed between the inner shell and the outer shell, the air inlet hole and the blowing hole are in communication with the annular cavity; the blowing hole is provided on one end of the outer shell close to the throat and is arranged towards the throat of the combustion chamber or perpendicular to the side wall of the combustion chamber; the air inlet hole is used for connecting an external compressed air device.

[0006] Further, the blowing hole comprises a plurality of through holes uniformly arranged along the circumference of the outer shell;

[0007] The included angle between the plurality of through holes and the central axis is the same and is 10°-90°.

[0008] Further, the outer shell further comprises a first annular groove in communication with the outer ends of the plurality of through holes;

[0009] The outer shell and the inner wall of the combustion chamber are gap-fitted, and the fitting gap is 0.15mm-0.20mm;

[0010] One end of the outer shell close to the throat of the combustion chamber is provided with a round corner, and the size of the round corner is R0.1-R0.3.

[0011] Further, the plurality of through holes have the same angle with the central axis and the angle is 10°-40°.

[0012] Further, the inner shell comprises a cylindrical segment and a conical segment connected with the cylindrical segment and located at the end of the air inlet tooling assembly close to the throat, and the end of the conical segment is inclined to the outer shell.

[0013] Further, the angle between the conical segment and the central axis is 10°-15°.

[0014] Further, the limiting assembly is an annular limiting plate sleeved on the throat of the combustion chamber, the outer shell of the air inlet tooling assembly is provided with a limiting boss, the limiting boss is fixedly connected with the annular limiting plate through bolts, and the limiting boss abuts against the end face of the combustion chamber.

[0015] Further, the air inlet tooling assembly further comprises a straight-through joint welded on the air inlet hole for connecting an external compressed air device.

[0016] The air inlet hole is at least two and is symmetrically arranged about the central axis of the air inlet tooling assembly.

[0017] Further, the surface of the outer shell, the side of the limiting boss in contact with the combustion chamber are provided with a second annular groove for arranging an O-shaped sealing ring.

[0018] The inner end face of the annular limiting plate is provided with a third annular groove for mounting a protective gasket.

[0019] Meanwhile, a combustion chamber liquid film inspection method based on the above combustion chamber liquid film blowing tool is also provided, and the special part of the method comprises the following steps:

[0020] Step 1, installing the combustion chamber liquid film blowing tool at the end of the combustion chamber far from the throat;

[0021] Step 2, simulating the liquid film of the combustion chamber by using water, adjusting the water inlet flow to form a liquid film on the inner wall of the throat of the combustion chamber, and introducing compressed air into the air inlet hole of the air inlet tooling assembly to simulate the high-pressure gas of the combustion chamber in the positive direction;

[0022] Step 3, controlling the pressure of the compressed air in the annular cavity to blow the liquid film in the throat of the combustion chamber from the blowing hole;

[0023] Step 4, observing the uniformity and integrity of the liquid film, if the liquid film is blown away, the tangential hole structure of the combustion chamber is repaired; if the liquid film remains stable and uniform in the blowing state, the liquid film of the combustion chamber meets the requirements.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] The application can accurately simulate the working process of the combustion chamber through medium water and compressed air, and provide a detection device and method for detecting the uniformity of the combustion chamber cooling liquid film under the impact of high-pressure gas; the air inlet tool assembly is simple in structure, convenient to operate, and convenient to connect with the combustion chamber. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is the installation schematic diagram of the liquid film blowing tool in the embodiment of the application;

[0027] Figure 2 is Figure 1 a top view of

[0028] Figure 3 is the structural schematic diagram of the liquid film blowing tool in the embodiment of the application;

[0029] Figure 4 is Figure 3 the enlarged structural schematic diagram of A in

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 1-air inlet tool assembly, 11-annular shell, 12-inner shell, 13-outer shell, 14-annular cavity, 15-air inlet hole, 16-blowing hole, 17-first annular groove, 18-limiting boss, 19-straight joint, 110-second annular groove, 111-O-shaped sealing ring, 2-annular limiting plate, 21-protection gasket, 3-water inlet interface, 31-tangential hole. DETAILED DESCRIPTION

[0032] The combustion chamber liquid film blowing tool of the application is shown in Figures 1 to 4 , comprising an air inlet tool assembly 1 and a limiting assembly. The air inlet tool assembly 1 comprises an annular shell 11, an air inlet hole 15 and a blowing hole 16 arranged on the annular shell 11, the blowing hole 16 being arranged at a position close to the throat of the combustion chamber; the annular shell 11 is nested at one end away from the throat of the combustion chamber, comprising an inner shell 12 and an outer shell 13, the outer shell 13 being gap-fitted with the inner wall of the combustion chamber, the fitting gap being 0.15mm-0.20mm, the annular cavity 14 being formed between the inner shell 12 and the outer shell 13, the air inlet hole 15 and the blowing hole 16 both being communicated with the annular cavity 14; the inner shell 12 comprises a cylindrical section and a conical section connected with the cylindrical section and located at the end of the air inlet tool assembly 1 close to the throat, the end of the conical section being inclined towards the outer shell 13, the included angle with the central axis being 10°-15°, facilitating the observation of the liquid film from the upper end of the combustion chamber, and having a guiding effect on the direction of the compressed air in the annular cavity 14.

[0033] The blowing hole 16 is arranged on the outer shell 13 near one end of the throat and comprises a plurality of through holes arranged uniformly in the circumferential direction of the outer shell 13; the plurality of through holes have the same angle with the central axis and are 10°-90°, Figure 1 as shown in the angle of Figure 3 and Figure 4 When the angle is an acute angle as shown, the through hole is inclined to the movement direction of the high-pressure gas of the combustion chamber, and is arranged towards the throat of the combustion chamber. In this embodiment, the number of through holes is 80-95, the hole diameter is not greater than 1.5 mm, the through holes have the same angle with the central axis and are preferably 10°-40°, the blowing hole 16 is arranged on the outer shell 13 near one end of the throat, and the beam of compressed air is used to form a stable high-speed flow of gas towards the throat of the outer shell 13 and the inner wall of the combustion chamber. When the angle is less than 40°, the local flow resistance loss coefficient is less than 0.3, which is more conducive to reducing the flow resistance of the liquid film blowing tool. The first annular groove 17 is arranged on the outer shell 13 at the position of the outer ends of the plurality of through holes, and the first annular groove 17 is used to form a stable and uniform gas flow at the outer ends of the plurality of through holes of the blowing hole 16. The end of the outer shell 13 near the throat of the combustion chamber is arranged as a round corner, and the size of the round corner is R0.1-R0.3. The arrangement of the cooperation gap and the round corner guides the compressed air of the blowing hole, and satisfies the compressed air with a specific flow rate and direction. If the cooperation gap and the round corner are too large, the compressed air will be dispersed, greatly reducing the directional flow rate of the compressed air between the outer shell 13 and the inner wall of the combustion chamber, and it is difficult to meet the requirements of simulation test. If the cooperation gap and the round corner are too small, the installation difficulty will be increased, and the inner wall of the combustion chamber may be damaged.

[0034] In this embodiment, the air inlet hole 15 is at least two and is symmetrically arranged about the central axis of the air inlet tool assembly 1. The straight-through joint 19 is welded on the air inlet hole 15 and is used to connect the compressed air device.

[0035] The limiting assembly is an annular limiting plate 2 sleeved on the throat of the combustion chamber. The inner end face of the annular limiting plate 2 is provided with a third annular groove for installing a protective gasket 21 to avoid the outer wall of the throat of the combustion chamber being damaged by the annular limiting plate 2. The outer shell 13 of the air inlet tool assembly 1 is provided with a limiting boss 18, the limiting boss 18 is fixed with the annular limiting plate 2 by bolts, and the limiting boss 18 abuts against one end face of the combustion chamber. The boss at the throat of the combustion chamber limits the annular limiting plate 2, so that the position of the air inlet tool assembly 1 is always stable.

[0036] The surface of the outer shell 13 and the side of the limiting boss 18 in contact with the combustion chamber are provided with a second annular groove 110 for setting an O-shaped sealing ring 111. The compression amount of the O-shaped sealing ring 111 provided on the side of the limiting boss 18 in contact with the combustion chamber is 25%-30%, and the compression amount of the O-shaped sealing ring 111 provided on the surface of the outer shell 13 is 12%-15%. If the compression amount is too small, sealing failure will occur, and if the compression amount is too large, the O-shaped sealing ring will be cut, which will further lead to sealing failure.

[0037] The use method of the combustion chamber liquid film blowing tool is as follows: corresponding O-shaped sealing rings 111 are arranged in the second grooves of the outer shell 13 of the air inlet tool assembly 1, the air inlet tool assembly 1 is inserted from the end far away from the combustion chamber and far away from the throat of the combustion chamber, and corresponding O-shaped sealing rings 111 are arranged on the side of the limiting boss 18 in contact with the combustion chamber; the annular limiting plate 2 is sleeved on the throat of the combustion chamber, and the protective gasket 21 is installed in the third annular groove of the annular limiting plate 2; the limiting boss 18 and the annular limiting plate 2 are butt-jointed by bolts, so that the air inlet tool assembly 1 and the combustion chamber are fixed by the annular limiting plate 2.

[0038] When the liquid film blowing test is performed to inspect the liquid film of the combustion chamber, the actual gas blowing liquid film process needs to be simulated. The combustion chamber is provided with tangential holes 31 and water inlet interfaces 3 communicating with the tangential holes 31 near the throat of the combustion chamber. Water is used to simulate the liquid film of the combustion chamber, the water inlet flow is adjusted to form a liquid film on the inner wall of the throat of the combustion chamber; compressed air is simultaneously introduced into the two air inlet holes 15 of the air inlet tool assembly 1 to simulate the high-pressure gas of the combustion chamber in the positive direction. As shown in Figure 1 the water flows into the combustion chamber through the tangential holes 31 arranged in the circumferential direction on the side wall of the combustion chamber through the water inlet interfaces 3, and a stable liquid film is formed on the inner wall of the combustion chamber. Then, compressed air is introduced through the air inlet tool assembly 1, the compressed air is blown to the liquid film through the blowing holes 16, and the uniformity and integrity of the liquid film are observed. If the liquid film is blown away, the tangential hole structure of the combustion chamber needs to be repaired, and if the liquid film can maintain a stable and uniform state under blowing, the liquid film of the combustion chamber meets the requirements.

Claims

1. A liquid film blowing tool for combustion chamber, characterized in that: it comprises an air inlet tool assembly (1) and a limiting assembly for fixing the air inlet tool assembly (1) on the combustion chamber; the air inlet tool assembly (1) comprises an annular shell (11) nested in one end of the combustion chamber, an air inlet hole (15) and a blowing hole (16) arranged on the annular shell (11); the annular shell (11) is nested in one end of the combustion chamber away from the throat, comprising an inner shell (12) and an outer shell (13), an annular cavity (14) is formed between the inner shell (12) and the outer shell (13), the air inlet hole (15) and the blowing hole (16) are communicated with the annular cavity (14); the blowing hole (16) is arranged on one end of the outer shell (13) close to the throat and is arranged towards the throat of the combustion chamber or perpendicular to the side wall of the combustion chamber; the blowing hole (16) comprises a plurality of through holes arranged uniformly along the circumference of the outer shell (13), and the plurality of through holes have the same angle with the central axis; a first annular groove (17) is arranged on the outer shell (13) and communicated with the outer ends of the plurality of through holes; the outer shell (13) is gap-fitted with the inner wall of the combustion chamber, and a second annular groove (110) is arranged on the side of the surface of the outer shell (13) in contact with the combustion chamber for arranging an O-shaped sealing ring (111); the air inlet hole (15) is used for connecting an external compressed air device. 2.The liquid film blowing tool for combustion chamber according to claim 1, characterized in that: the angle between the plurality of through holes and the central axis is 10°-90°. 3.The liquid film blowing tool for combustion chamber according to claim 2, characterized in that: the fitting gap between the outer shell (13) and the inner wall of the combustion chamber is 0.15mm-0.20mm; and one end of the outer shell (13) close to the throat of the combustion chamber is arranged as a round corner with a size of R0.1-R0.

3. 4.The liquid film blowing tool for combustion chamber according to claim 3, characterized in that: the angle between the plurality of through holes and the central axis is 10°-40°. 5.The liquid film blowing tool for combustion chamber according to any one of claims 1-4, characterized in that: the inner shell (12) comprises a cylindrical section and a conical section connected with the cylindrical section and located at one end of the air inlet tool assembly (1) close to the throat, and the end of the conical section is inclined towards the outer shell (13). 6.The liquid film blowing tool for combustion chamber according to claim 5, characterized in that: the angle between the conical section and the central axis is 10°-15°. 7.The liquid film blowing tool for combustion chamber according to claim 6, characterized in that: the limiting assembly is an annular limiting plate (2) sleeved on the throat of the combustion chamber, a limiting boss (18) is arranged on the outer shell (13) of the air inlet tool assembly (1), the limiting boss (18) is fixed with the annular limiting plate (2) by bolts, and the limiting boss (18) abuts against one end surface of the combustion chamber. 8.The liquid film blowing tool for combustion chamber according to claim 7, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The air inlet tooling assembly (1) further comprises a straight-through joint (19) welded on the air inlet hole (15) for connecting an external compressed air device; The air inlet hole (15) is at least two and symmetrically arranged about the central axis of the air inlet tooling assembly (1).

9. The liquid film blowing tooling for combustion chamber according to claim 8, characterized in that: The side of the limiting boss (18) in contact with the combustion chamber is provided with a second annular groove (110) for setting an O-shaped sealing ring (111); The inner end surface of the annular limiting plate (2) is provided with a third annular groove for installing a protective gasket (21).

10. A method for inspecting a liquid film in a combustion chamber, based on the liquid film blowing tool according to any one of claims 1-9, characterized in that, The method comprises the following steps: Step 1, install the liquid film blowing tooling for combustion chamber at the end of the combustion chamber far from the throat; Step 2, simulate the liquid film of the combustion chamber by water, adjust the water flow to form a liquid film on the inner wall of the combustion chamber throat, and introduce compressed air into the air inlet hole (15) of the air inlet tooling assembly to simulate the high-pressure gas of the combustion chamber in the positive direction; Step 3, control the pressure of the compressed air in the annular cavity (14) to blow the liquid film in the combustion chamber throat from the blowing hole (16); Step 4, observe the uniformity and integrity of the liquid film, if the liquid film is blown away, then repair the tangential hole structure of the combustion chamber; if the liquid film remains stable and uniform in the blowing state, then the liquid film of the combustion chamber meets the requirements.

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