Directional exhaust rain hat for inflammable and explosive isobutane medium and working method of directional exhaust rain hat

Abstract

The invention belongs to the technical field of wind tunnel tests, and discloses a directional exhaust rain cap for inflammable and explosive isobutane media and a working method of the directional exhaust rain cap. The directional exhaust rain cap is of a vertical welding integrated structure, and the lower end of the exhaust pipe is connected to a discharge inlet through an interface flange. Supporting ribs are welded to the upper end of the exhaust pipe in the circumferential direction, and a flying-saucer-shaped guiding rainproof cone is welded to the tops of the supporting ribs. The guide rainproof cone is sleeved with a directional cylinder; the bottom surface of the orientation cylinder is hermetically welded with the exhaust pipe, and the lower section of the orientation cylinder close to the bottom surface of the orientation cylinder is provided with drainage pipes uniformly distributed along the circumferential direction; the upper end of the drain pipe elbow is lower than that of the exhaust pipe. According to the working method, the gas emission direction is set to be vertically upward, the guiding rainproof cone is adopted for preventing rain, the safety and reliability of the high-temperature wind tunnel fuel supply system are improved, the high-temperature wind tunnel fuel supply system can be expanded and applied to gas with the relative air density larger than 1, and the engineering practical value is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wind tunnel test, and particularly relates to a directional exhaust rain cap for flammable and explosive isobutane medium and a working method thereof. BACKGROUND

[0002] To reproduce the total temperature of airflow of high-speed aircraft under real flight conditions, carry out high-speed aircraft engine test, aircraft body propulsion integration test and large-area thermal structure test, a high-temperature wind tunnel is needed. The high-temperature wind tunnel usually adopts a combustion heater. During the test, a mixture of high-pressure fuel (isobutane), high-pressure air and liquid oxygen is combusted in a high-power high-pressure combustion heater to form a high-temperature and high-pressure airflow, which is expanded and accelerated by a high-speed nozzle to form a high-speed jet flow, so as to carry out aerodynamic test on an engine, an aircraft or a thermal structure component installed in a test section.

[0003] The fuel supply system is one of the main subsystems of the high-temperature wind tunnel, which is used to provide the fuel necessary for the operation of the high-temperature wind tunnel. The fuel supply system is composed of a low-pressure storage system and a high-pressure supply system; the low-pressure storage system stores the isobutane fuel required for the test for a long time, emergency relief and recovery of the remaining fuel after the test, and the design pressure of the low-pressure storage system is only 1.0 MPa; the high-pressure supply system pressurizes the fuel in the high-pressure storage tank by high-pressure nitrogen to provide the isobutane fuel with the required flow rate and pressure to the combustion heater, and the design pressure of the high-pressure supply system is as high as 35 MPa.

[0004] To ensure that the low-pressure storage system operates in a safe pressure range, the storage tank needs to be discharged and depressurized. In order to prevent rainwater from entering the pipeline, a conventional gas discharge device directly installs a single-layer conical rainproof cap at the end of the discharge pipeline or adds an elbow at the end of the pipeline to make the discharge pipeline axis downward. When discharging, the conventional gas discharge device has a gas flow direction toward the ground, which is acceptable in the case of harmless gas, but the flammable and explosive isobutane gas has a larger density than air (relative air density greater than 1), and after being discharged downward, it is easy to deposit on the ground to form aggregation, which has a great safety risk.

[0005] At present, it is urgent to develop a directional exhaust rain cap for flammable and explosive isobutane medium and a working method thereof. SUMMARY

[0006] One of the technical problems to be solved by the present application is to provide a directional exhaust rain cap for flammable and explosive isobutane medium, and another technical problem to be solved by the present application is to provide a working method of the directional exhaust rain cap for flammable and explosive isobutane medium, so as to overcome the defects of the prior art.

[0007] The directional exhaust rain cap for flammable and explosive isobutane medium of the present application is a vertical welded integrated structure, which comprises a directional cylinder, a guide rainproof cone, a support rib, a drain pipe, an exhaust pipe and a flange. The lower end of the exhaust pipe is connected to the discharge inlet of the flammable and explosive isobutane medium through an interface flange; the upper end of the exhaust pipe is circumferentially welded with uniformly distributed support ribs, and a flying disc type guide rainproof cone is welded on the top of the support ribs; the guide rainproof cone is sleeved with a directional cylinder; the upper end of the directional cylinder is higher than the guide rainproof cone, the lower end of the directional cylinder extends to the upper section of the exhaust pipe, the bottom surface of the directional cylinder is closed and welded with the exhaust pipe, and the lower section of the directional cylinder close to the bottom surface of the directional cylinder is provided with circumferentially uniformly distributed drain pipes; the opening of the drain pipe is connected to an upward elbow, and the upper end of the elbow is lower than the upper end of the exhaust pipe.

[0008] Further, the guide rainproof cone is composed of two upper and lower conical lines with equal diameters, the top angle of the upper cone is larger than that of the lower cone, and the annular gap area between the guide rainproof cone and the directional cylinder is not less than the cross-sectional area of the exhaust pipe.

[0009] Further, the diameter of the conical line of the guide rainproof cone is larger than the outer diameter of the exhaust pipe, so that rainwater is prevented from entering the exhaust pipe.

[0010] Further, the distance between the upper end of the elbow of the drain pipe and the upper end of the exhaust pipe is determined by the maximum rainfall in 24 hours, so that rainwater is prevented from flowing back into the exhaust pipe.

[0011] The working method of the directional exhaust rain cap for flammable and explosive isobutane medium comprises the following contents: During exhaust, the flammable and explosive isobutane medium enters the exhaust pipe from the discharge inlet, is guided along the conical line of the lower cone of the guide rainproof cone, passes through the support ribs, passes through the annular gap between the guide rainproof cone and the directional cylinder, enters the directional cylinder, and is vertically discharged upward from the directional cylinder. When it rains, rainwater passes through the directional cylinder, is guided along the conical line of the upper cone, is collected at the bottom of the directional cylinder, rainwater exceeding the upper end of the elbow of the drain pipe is discharged through the drain pipe, and the remaining rainwater liquid-seals the drain pipe at the bottom of the directional cylinder.

[0012] The directional exhaust rain cap for flammable and explosive isobutane medium and the working method thereof solve the contradiction between exhaust safety and rain prevention of flammable and explosive isobutane gas, set the exhaust direction as vertically upward, adopt the guide rainproof cone to consider rain prevention, and improve the safety and reliability of the fuel supply system of the high-temperature wind tunnel, which can be applied to gases with a relative air density greater than 1 and has engineering practical value. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic diagram (perspective view) of the directional exhaust rain cap for flammable and explosive isobutane medium. Figure 2 It is a structural schematic diagram (cross-sectional view) of the directional exhaust rain cap for flammable and explosive isobutane medium.

[0014] In the figure, 1. directional cylinder; 2. guide rain cone; 3. support rib; 4. drain pipe; 5. exhaust pipe; 6. interface flange. DETAILED DESCRIPTION

[0015] The application will be described in detail below with reference to the accompanying drawings and examples.

[0016] In this embodiment, the support rib 3 has 4, and the drain pipe 4 also has 4, the support rib 3 and the drain pipe 4 are evenly distributed along the circumference and are staggered with each other.

[0017] As shown in Figure 1 , Figure 2 , the combustible and explosive isobutane medium directional exhaust rain cap of this embodiment is a vertical welded integral structure, including a directional cylinder 1, a guide rain cone 2, a support rib 3, a drain pipe 4, an exhaust pipe 5 and an interface flange 6; The lower end of the exhaust pipe 5 is connected to the discharge inlet of the combustible and explosive isobutane medium through the interface flange 6; the upper end of the exhaust pipe 5 is welded with evenly distributed support ribs 3 along the circumference, the top of the support rib 3 is welded with a flying disc type guide rain cone 2; the guide rain cone 2 is sleeved with the directional cylinder 1; the upper end of the directional cylinder 1 is higher than the guide rain cone 2, the lower end of the directional cylinder 1 extends to the upper segment of the exhaust pipe 5, the bottom surface of the directional cylinder 1 is closed and welded with the exhaust pipe 5, and the drain pipe 4 is arranged along the circumference and evenly distributed near the bottom surface of the directional cylinder 1; the opening of the drain pipe 4 is connected to an upward elbow, and the upper end of the elbow is lower than the upper end of the exhaust pipe 5.

[0018] Further, the guide rain cone 2 is composed of two conical lines with equal diameters, the top angle of the upper cone is greater than that of the lower cone; the annular gap area between the guide rain cone 2 and the directional cylinder 1 is not less than the cross-sectional area of the exhaust pipe 5.

[0019] Further, the diameter of the conical line of the guide rain cone 2 is greater than the outer diameter of the exhaust pipe 5, which prevents rainwater from entering the exhaust pipe 5.

[0020] Further, the distance between the upper end of the elbow of the drain pipe 4 and the upper end of the exhaust pipe 5 is determined by the maximum rainfall in 24 hours, which prevents rainwater from flowing back into the exhaust pipe 5.

[0021] The working method of the combustible and explosive isobutane medium directional exhaust rain cap of this embodiment includes the following contents: When exhausting, the combustible and explosive isobutane medium enters the exhaust pipe 5 from the discharge inlet, flows along the conical line of the lower cone of the guide rain cone 2, passes through the support rib 3, enters the directional cylinder 1 through the annular gap between the guide rain cone 2 and the directional cylinder 1, and is vertically discharged upward from the directional cylinder 1; When it rains, the rainwater is guided along the conic line of the upper cone through the directional cylinder 1 and collected at the bottom of the directional cylinder 1. The rainwater exceeding the upper end of the bend of the drain pipe 4 is discharged through the drain pipe 4, and the remaining rainwater liquidly seals the drain pipe 4 at the bottom of the directional cylinder 1.

[0022] While embodiments of the application have been disclosed in connection with the above specification and drawings, it will be understood by those skilled in the art that the application is not limited to the particulars disclosed but extends to all features evident from the disclosure and having a constructive reduction to practice, or to any modifications or equivalents of the disclosed features or steps in the disclosed methods or processes, except insofar as they have been disclaimed.

Claims

1. A directional exhaust rain cap for flammable and explosive isobutane media, characterized in that: The directional exhaust rain cap is a vertical welded integrated structure, comprising a directional cylinder (1), a guide rain cone (2), support ribs (3), a drain pipe (4), an exhaust pipe (5) and an interface flange (6); The lower end of the exhaust pipe (5) is connected to the discharge inlet of the flammable and explosive isobutane medium through an interface flange (6); the upper end of the exhaust pipe (5) is welded with uniformly distributed support ribs (3) along the circumference, and a flying saucer-shaped guide rain cone (2) is welded on the top of the support rib (3); the guide rain cone (2) is sheathed with a directional cylinder (1); the upper end of the directional cylinder (1) is higher than the guide rain cone (2), and the lower end of the directional cylinder (1) extends to the upper section of the exhaust pipe (5), the bottom surface of the directional cylinder (1) is sealed and welded to the exhaust pipe (5), and the lower section of the directional cylinder (1) is provided with a drainage pipe (4) uniformly distributed along the circumference near the bottom surface of the directional cylinder (1); the opening of the drainage pipe (4) is connected to an upward elbow, and the upper end of the elbow is lower than the upper end of the exhaust pipe (5).

2. The directional exhaust rain cap for flammable and explosive isobutane media according to claim 1, characterized in that: The guide rain cone (2) is composed of two cones with equal cone line diameters, the top angle of the upper cone is larger than the top angle of the lower cone; the area of ​​the annular gap between the guide rain cone (2) and the directional cylinder (1) is not less than the cross-sectional area of ​​the exhaust pipe (5).

3. The directional exhaust rain cap for flammable and explosive isobutane media according to claim 1, characterized in that: The cone line diameter of the guide rainproof cone (2) is larger than the outer diameter of the exhaust pipe (5), thereby preventing rainwater from entering the exhaust pipe (5).

4. The directional exhaust rain cap for flammable and explosive isobutane media according to claim 1, characterized in that: The distance between the upper end of the elbow of the drainage pipe (4) and the upper end of the exhaust pipe (5) is determined by the local maximum rainfall in 24 hours to prevent rainwater from flowing back into the exhaust pipe (5).

5. A method for operating a directional exhaust rain cap for flammable and explosive isobutane media, which is used for the directional exhaust rain cap for flammable and explosive isobutane media according to any one of claims 1 to 4, characterized in that: The working method includes the following contents: During exhaust, the flammable and explosive isobutane medium enters the exhaust pipe (5) from the exhaust inlet, is guided along the cone line of the cone below the guide rain cone (2), passes through the support rib (3), enters the directional cylinder (1) through the annular gap between the guide rain cone (2) and the directional cylinder (1), and is discharged vertically upward from the directional cylinder (1); When it rains, rainwater flows through the directional cylinder (1) along the cone line of the upper cone and is collected at the bottom of the directional cylinder (1). Rainwater that exceeds the upper end of the elbow of the drain pipe (4) is discharged through the drain pipe (4), and the remaining rainwater is liquid-sealed on the drain pipe (4) at the bottom of the directional cylinder (1).

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