Slit exhaust device for flow control model test based on eccentric wheel

Abstract

The invention relates to a slit exhaust device for a flow control model test based on an eccentric wheel. 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 moving ring is provided with a double-thread screw, the other end of the double-thread screw abuts against an eccentric locking block, the eccentric locking block is arranged on the head of an eccentric bolt in a sleeving mode, and the eccentric bolt is installed 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 gap width of the exhaust gap is adjusted by adjusting an eccentric bolt and an eccentric locking block, an exhaust flow control test is conveniently carried out, and the test efficiency is improved. 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 for a flow control model test based on an eccentric wheel. 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] For this purpose, we propose a slit exhaust device based on an eccentric wheel flow control model test. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a slit exhaust device for flow control model testing based on an eccentric wheel, which can achieve circumferential continuous slit exhaust on the model surface 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 flow control model test based on an eccentric wheel, 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] The moving ring is provided with a double-headed screw, the other end of which is pressed against an eccentric locking block, the eccentric locking block is sleeved on the head of the eccentric bolt, and the eccentric bolt is installed 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 gap width of the exhaust gap is adjusted by adjusting the eccentric bolt and the eccentric locking block, which facilitates the implementation of the exhaust flow control test and improves the test efficiency.

[0013] It is further characterized by:

[0014] The stud bolt is provided with a spring for providing a pulling force to the moving ring.

[0015] The model front section and the model rear section are connected by bolt two.

[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 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 gap 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 parameters of the eccentric bolt and the eccentric locking block can be designed according to the required gap adjustment range. During the test, the eccentric bolt is rotated to adjust to a gap width, the cover ring is installed to carry out the test, and the air cavity of the front section and the rear section of the model is inflated through the inflation pipe. 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 is opened, and the gap is adjusted to the required width by adjusting the four eccentric bolts or eccentric locking blocks in the circumference. After the adjustment is completed, the cover ring is covered and the test is continued. The eccentric bolt and the eccentric locking block can be customized, and the eccentric bolt and the eccentric locking block cooperate with each other to have higher adjustment accuracy, which is convenient for precise positioning.

[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. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention.

[0025] Figure 2 It is a cross-sectional schematic diagram of the present invention.

[0026] Figure 3 It is a schematic diagram of the slit exhaust device of the present invention without a cover ring.

[0027] 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. eccentric bolt; 11. bolt two; 12. locking nut; 13. eccentric locking block. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0029] like Figure 1-Figure 3 As shown, a slit exhaust device for a flow control model test based on an eccentric wheel includes 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] One end of the stud screw 8 is fixed on the moving ring 3, and the other end of the stud screw 8 is pressed against the eccentric locking block 13. The eccentric bolt 10 is installed on the rear section 5 of the model. The eccentric locking block 13 is sleeved on the head of the eccentric bolt 10, and the eccentric bolt 10 can rotate in the eccentric locking block 13. A spring 9 is provided on the stud screw 8, and the spring 9 provides tension to the moving ring 3. The gap width of the exhaust slit is adjusted by the spring 9 and the eccentric bolt 10. By rotating the eccentric bolt 10 to adjust the contact surface between the eccentric locking block 13 and the eccentric bolt 10, the gap between the moving ring 3 and the fixed ring 2 can be controlled to adjust the gap width of the exhaust slit.

[0034] There are two ways to adjust the gap. One is to adjust the gap in a small distance by directly rotating the eccentric bolt 10. If the adjustment range exceeds the maximum distance of the eccentric bolt 10, the contact surface between the eccentric locking block 13 and the stud screw 8 can be replaced. The combination of the two methods can continuously adjust the gap width over a large range. After the gap width is adjusted to the desired width, it is locked by the locking nut 12.

[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. The parameters of the eccentric bolt 10 and the eccentric locking block 13 can be designed according to the required gap adjustment range.

[0036] During the test, the eccentric bolt 10 is rotated to adjust the gap width, the cover ring 4 is installed to carry out the test, and 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 eccentric bolts 10 or the eccentric locking block 13. After the adjustment is completed, the cover ring 4 is covered and the test is continued. The eccentric bolt 10 and the eccentric locking block 13 can be customized, and the eccentric bolt 10 and the eccentric locking block 13 cooperate with each other to achieve higher adjustment accuracy and facilitate precise positioning.

[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 based on an eccentric wheel flow control model test, 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); The moving ring (3) is provided with a double-headed screw (8), the other end of the double-headed screw (8) is pressed against an eccentric locking block (13), the eccentric locking block (13) is sleeved on the head of an eccentric bolt (10), and the eccentric bolt (10) is installed on the rear section (5) of the model; The front section (1) and the rear section (5) of the model have air cavities inside, and an exhaust slit is formed between the fixed ring (2) and the movable ring (3). The width of the exhaust slit is adjusted by adjusting the eccentric bolt (10) and the eccentric locking block (13), thereby facilitating the implementation of the exhaust flow control test and improving the test efficiency.

2. A slit exhaust device for flow control model test based on an eccentric wheel as claimed in claim 1, characterized in that: The stud bolt (8) is provided with a spring (9) for providing a pulling force to the moving ring (3).

3. A slit exhaust device for flow control model test based on an eccentric wheel as claimed in claim 1, characterized in that: The model front section (1) and the model rear section (5) are connected via bolt 2 (11).

4. A slit exhaust device for flow control model test based on an eccentric wheel as claimed in claim 2, 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. The slit exhaust device for flow control model test based on an eccentric wheel as claimed in 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. The slit exhaust device for flow control model test based on an eccentric wheel as claimed in claim 1, characterized in that: The fixing ring (2) is mounted on the front section (1) of the model via bolt 1 (7).

7. The slit exhaust device for flow control model test based on an eccentric wheel 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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