Slit exhaust device for navigation body flow control model test

Abstract

The invention relates to a slit exhaust device for a navigation body flow control model test. The slit exhaust device comprises a model front section, a model rear section, a fixed ring and a movable ring, the model rear section is detachably connected with the model front section; the fixing ring is fixedly connected with the model front section and located between the model front section and the model rear section. The movable ring is adjustably arranged on the model rear section; the model front section and the model rear section are internally provided with air cavities, an exhaust gap is formed between the fixed ring and the movable ring, the width of the exhaust gap is adjusted by adjusting the movable ring, the development of an exhaust flow control test is facilitated, the test efficiency is improved, the movable ring is connected with the model rear section through a double-thread screw, and a spring is arranged on the double-thread screw. And the double-thread screw is provided with an adjusting nut at one end of the model rear section. According to the invention, the structure strength of model connection can be ensured while circumferential continuous slit exhaust on the surface of the model can be realized, and the gap of the exhaust slit can be adjusted according to requirements, so that the test efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of underwater launch test, in particular to a slit exhaust device used for a navigation body flow control model test. Background Art

[0002] The underwater launch of a vehicle is often in a high-speed unsteady mechanical environment, and its trajectory stability is a huge challenge. Generally, flow control measures are required to improve the force environment of the vehicle. Exhausting air on the surface of the vehicle to form cavitation and change the flow characteristics on the surface of the vehicle is an effective way to adjust the force on the vehicle.

[0003] Generally, there are two forms of exhaust on the surface of a navigation body: exhaust holes and exhaust slits. In experimental research, the exhaust hole method is relatively simple to implement. Since the opening has a relatively small impact on the structural integrity and strength of the model, an air cavity can be set inside the model and holes can be directly punched on the shell surface. However, studies have found that the gas jet connectivity between the holes in the porous exhaust process affects the flow control effect. In comparison, since the exhaust slit is continuous, there is no problem of cavitation connectivity. However, the continuous exhaust slit on the surface will completely disconnect the shell surface, and there may also be some problems with the structural strength of the connection between the front and rear sections of the exhaust slit. Therefore, it is necessary to consider the connection form of the shell on both sides of the exhaust slit to solve this problem. At the same time, during the experiment, it is often necessary to test different gap widths to test the control effect.

[0004] Therefore, we propose a slit exhaust device for flow control model test of navigation body. Summary of the invention

[0005] In view of the shortcomings in the above-mentioned existing production technology, the applicant provides a slit exhaust device for use in the flow control model test of a navigation body, which can achieve continuous circumferential slit exhaust on the surface of the model while ensuring the structural strength of the model connection, and can adjust the exhaust slit gap according to needs, thereby improving the test efficiency.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A slit exhaust device for a flow control model test of a navigation body, comprising:

[0008] Model front section;

[0009] The rear section of the model is detachably connected to the front section of the model;

[0010] A fixing ring, fixedly connected to the front section of the model and located between the front section of the model and the rear section of the model;

[0011] A movable ring, adjustable and arranged on the rear section of the model;

[0012] Among them, there are air cavities inside the front section and the rear section of the model, and an exhaust gap is formed between the fixed ring and the movable ring. The movable ring is connected to the rear section of the model through a double-headed screw, and a spring is arranged on the double-headed screw. An adjusting nut is arranged at one end of the rear section of the model. The gap width of the exhaust gap is adjusted by the spring and the adjusting nut, which facilitates the implementation of the exhaust flow control test and improves the test efficiency.

[0013] It is further characterized by:

[0014] The model front section and the model rear section are connected by bolt two.

[0015] A sealing ring is arranged between the front section of the model and the rear section of the model.

[0016] An exhaust hole is provided around the air cavity, and a connected annular pressure-stabilizing cavity is provided outside the exhaust hole.

[0017] The rear section of the model is provided with an inflation tube for inflating air into the air cavity.

[0018] The fixing ring is mounted on the front section of the model by means of bolt 1.

[0019] A cover ring is arranged between the moving ring and the rear section of the mold.

[0020] The beneficial effects of the present invention are as follows:

[0021] The present invention has a compact and reasonable structure and is easy to operate. The exhaust slit between the fixed ring and the movable ring, and the gap adjustment mechanism composed of the movable ring and the rear section of the model, ensure the structural strength while realizing a circumferentially continuous exhaust slit and being able to adjust the slit width. It is convenient to carry out the exhaust flow control test and improve the test efficiency. The volume of the air cavity and the size of the exhaust mechanism can be adjusted or changed according to the shape and scale of the model. The adjusting nut and the double-headed screw cooperate with each other for adjustment, and the structure is simple. The adjusting nut 12 can be a standard part, which is easy to purchase and low in cost.

[0022] At the same time, the present invention also has the following advantages:

[0023] (1) An exhaust gap is formed between the fixed ring and the movable ring, and an air cavity is formed between the front section and the rear section of the model. Air is inflated into the air cavity through an air inflation tube to simulate the exhaust process of a narrow slit. An exhaust hole is opened around the air cavity, and a connected annular pressure-stabilizing cavity is located outside the exhaust hole. After the gas is discharged through the exhaust hole, it enters the pressure-stabilizing cavity and is then discharged through the exhaust gap.

[0024] (2) During the test, the gap width is adjusted to a certain value by adjusting the nut, and the cover ring is installed to carry out the test. The air cavity of the front and rear sections of the model is inflated through the inflation tube, and the gas is discharged through the exhaust slit to form cavitation. The mechanical characteristic parameters of the navigation body are measured in the test. After the test, the cover ring is opened, and the gap is adjusted to the required width by adjusting the four circumferential adjustment nuts. After the adjustment is completed, the cover ring is covered and the test is continued. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention.

[0026] Figure 2 It is a cross-sectional schematic diagram of the present invention.

[0027] Figure 3 It is a schematic diagram of the slit exhaust device of the present invention without a cover ring.

[0028] Among them: 1. front section of the model; 2. fixed ring; 3. movable ring; 4. cover ring; 5. rear section of the model; 6. inflation tube; 7. bolt one; 8. double-headed screw; 9. spring; 10. sealing ring; 11. bolt two; 12. adjusting nut. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is described below in conjunction with the accompanying drawings.

[0030] like Figure 1-Figure 3 As shown, a slit exhaust device for a flow control model test of a navigation body comprises a model front section 1, a fixed ring 2, a movable ring 3, a cover ring 4, a model rear section 5 and an inflation tube 6.

[0031] The model front section 1 and the model rear section 5 are detachably connected, and the model front section 1 and the model rear section 5 can be connected by bolts 11; after the model front section 1 and the model rear section 5 are connected, an air cavity is formed inside the model front section 1 and the model rear section 5.

[0032] The fixed ring 2 is fixed on the model front section 1, and the fixed ring 2 is detachably arranged on the model front section 1. The fixed ring 2 is installed on the model front section 1 by bolts 7. The movable ring 3 is installed on the model rear section 5 by double-headed screws 8, and the cover ring 4 is arranged between the movable ring 3 and the model rear section 5. The fixed ring 2, the movable ring 3 and the cover ring 4 are between the model front section 1 and the model rear section 5.

[0033] An exhaust gap is formed between the fixed ring 2 and the movable ring 3, and an air cavity is formed between the model front section 1 and the model rear section 5. Air is inflated into the air cavity through the inflation tube 6 to simulate the slit exhaust process. Exhaust holes are opened around the air cavity, and the outside of the exhaust holes is a connected annular pressure-stabilizing chamber. After the gas is discharged through the exhaust holes, it enters the pressure-stabilizing chamber and is then discharged through the exhaust gap.

[0034] One end of the double-headed screw 8 is fixed on the moving ring 3, and the other end of the double-headed screw 8 is installed on the model rear section 5. The double-headed screw 8 is provided with an adjusting nut 12 at one end of the model rear section 5. A spring 9 is installed on the double-headed screw 8. The spring 9 is compressed to provide elastic force to the moving ring 3. The spring 9 cooperates with the adjusting nut 12 to adjust the gap width of the exhaust slit. A sealing ring 10 is provided between the model front section 1 and the model rear section 5 for sealing between the model front section 1 and the model rear section 5.

[0035] The exhaust gap between the fixed ring 2 and the movable ring 3, and the gap adjustment mechanism composed of the movable ring 3 and the model rear section 5, ensure the structural strength while realizing a circumferentially continuous exhaust gap and being able to adjust the gap width. This facilitates the development of the exhaust flow control test and improves the test efficiency. The volume of the air cavity and the size of the exhaust mechanism can be adjusted or changed according to the shape and scale of the model.

[0036] During the test, the gap width is adjusted to a certain width by adjusting the nut 12, and the cover ring 4 is installed to carry out the test. The air cavity of the model front section 1 and the model rear section 5 is inflated through the inflation tube 6. The gas is discharged through the exhaust slit to form cavitation, and the mechanical characteristic parameters of the navigation body are measured in the test. After the test, the cover ring 4 is opened, and the gap is adjusted to the required width by adjusting the four circumferential adjustment nuts 12. After the adjustment is completed, the cover ring 4 is covered and the test is continued. The adjustment nut 12 cooperates with the double-headed screw 8 for adjustment, and the structure is simple. The adjustment nut 12 can be a standard part, which is easy to purchase and low in cost.

[0037] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A slit exhaust device for a flow control model test of a navigation body, characterized in that: include: Model front section (1); The rear section of the model (5) is detachably connected to the front section of the model (1); A fixed ring (2) is fixedly connected to the front section of the model (1) and is located between the front section of the model (1) and the rear section of the model (5); A movable ring (3) is adjustably arranged on the rear section (5) of the model; The model front section (1) and the model rear section (5) have air cavities inside, an exhaust slit is formed between the fixed ring (2) and the movable ring (3), the movable ring (3) is connected to the model rear section (5) through a double-headed screw (8), a spring (9) is arranged on the double-headed screw (8), and an adjusting nut (12) is arranged at one end of the model rear section (5). The gap width of the exhaust slit is adjusted by the spring (9) and the adjusting nut (12), so as to facilitate the implementation of the exhaust flow control test and improve the test efficiency.

2. A slit exhaust device for a flow control model test of a navigation body according to claim 1, characterized in that: The model front section (1) and the model rear section (5) are connected via bolt 2 (11).

3. A slit exhaust device for a flow control model test of a navigation body according to claim 2, characterized in that: A sealing ring (10) is provided between the model front section (1) and the model rear section (5).

4. A slit exhaust device for a flow control model test of a navigation body as claimed in claim 3, characterized in that: An exhaust hole is provided around the air cavity, and a connected annular pressure-stabilizing cavity is provided outside the exhaust hole.

5. A slit exhaust device for a flow control model test of a navigation body according to claim 1, characterized in that: The rear section (5) of the model is provided with an air filling tube (6) for filling the air cavity.

6. A slit exhaust device for a flow control model test of a navigation body according to claim 1, characterized in that: The fixing ring (2) is mounted on the front section (1) of the model via bolt 1 (7).

7. A slit exhaust device for a flow control model test of a navigation body as claimed in claim 1, characterized in that: A cover ring (4) is provided between the moving ring (3) and the rear section (5) of the mold.

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