Scale model test device and method for small-angle water outlet of supercavitation navigation body

Abstract

The invention relates to a supercavitation navigation body small-angle water outlet scale model test device and method, and the device comprises a power system, a platform height lifting system, an initial water outlet angle adjustment system, a water surface evacuation system, a wave generation system, a line target speed measurement system, and a model recovery system, and the power system is used for launching a navigation body model; the platform height lifting system is used for adjusting the height; the initial water outlet angle adjusting system is matched with the platform height lifting system to adjust the initial water inlet angle of the navigation body model; the water surface vacuumizing system is used for vacuumizing the water tank; the wave making system is used for making a wave water surface; the line target speed measurement system is used for measuring the speed of the navigation body model; the model recovery system is used for recovering the navigation body model. According to the invention, the depth adjustment of the initial water depth and the angle adjustment of the preset water outlet angle are realized when the navigation body moves underwater, the simulation of wave sea conditions can be realized, and the physical phenomena such as supercavitation form and trajectory instability of a cross-domain gas-water interface in the underwater movement process of the navigation body can be recorded.

Description

Technical Field

[0001] The present invention relates to the technical field of navigation body testing, and in particular to a scaled-down model testing device and method for a supercavitation navigation body to exit water at a small angle. Background Art

[0002] The core concept of supercavitation technology is to achieve high maneuverability of weapons during flight through high-speed movement and aerodynamic principles. This technology can not only greatly improve the strike accuracy and penetration capability of weapons, but also greatly enhance penetration and survivability.

[0003] There are few studies on supercavitation technology and supercavitation vehicles emerging from water, especially systematic supercavitation vehicle emerging from water test. In the supercavitation vehicle emerging from water test, the most difficult is the small-angle emerging from water test condition, because it involves physical phenomena such as ballistic instability when the vehicle crosses the air-water interface. This patent is intended to systematically explain the scaled model test method of supercavitation vehicles emerging from water at small angles.

[0004] Existing research on supercavitating vehicles exiting water at small angles has the following two main shortcomings:

[0005] (1) Numerical simulation studies lack comparable standard model tests

[0006] At present, the research on small-angle water exit of supercavitating vehicles is still at the stage of numerical simulation. However, crossing the air-water interface is an extremely complex process, accompanied by multiphase flow, cavitation, phase change, turbulent instability, and small-angle water exit is a special physical phenomenon caused by ballistic instability. Therefore, it is difficult to accurately predict the force, motion trajectory and posture of the vehicle through numerical simulation. In addition, there is a lack of standard model tests that can serve as a reference for numerical simulation calculation results, which further slows down the research on numerical simulation of small-angle water exit of supercavitating vehicles.

[0007] (2) There is a lack of systematic research on the scale model test method for supercavitating vehicles exiting the water at small angles

[0008] At present, the experimental research on the water emergence of navigation bodies mainly focuses on the vertical and inclined water emergence of low-speed navigation bodies, while there are very few experimental studies on scaled models of supercavitating navigation bodies with small-angle water emergence. There are no literature or patents that systematically explain the relevant experimental methods. The industry lacks systematic research on scaled model test methods for supercavitating navigation bodies with small-angle water emergence from multiple aspects such as similarity criteria, experimental principles, experimental equipment, and functional realization.

[0009] To this end, we propose a scaled model test device and method for a supercavitating vehicle exiting water at a small angle. Summary of the invention

[0010] In view of the shortcomings in the above-mentioned existing production technology, the applicant provides a scaled-down model test device and method for a supercavitating vehicle to exit the water at a small angle, thereby enabling depth adjustment of the initial water depth and angle adjustment of the preset exit angle when the vehicle moves underwater, thereby achieving effective recovery of the vehicle.

[0011] The technical solution adopted by the present invention is as follows:

[0012] A scaled model test device for a supercavitating vehicle exiting water at a small angle, comprising:

[0013] A power system for launching the vehicle model;

[0014] Platform height lifting system for adjusting the height;

[0015] The initial water exit angle adjustment system cooperates with the platform height lifting system to adjust the initial water entry angle of the navigation body model;

[0016] Water surface vacuum system, used for vacuuming the pool;

[0017] Wave making system, used to create wavy water surface;

[0018] Line target speed measurement system, used to measure the speed of the navigation model;

[0019] Model recovery system, used to recover the navigation body model.

[0020] It is further characterized by:

[0021] The power system includes a smoothbore gun, which includes a first truss, the first truss is provided with an angle adjustment mechanism and a first docking plate, the other side of the angle adjustment mechanism is connected to the smoothbore gun barrel, the end of the smoothbore gun barrel is provided with a powder chamber, and the top of the smoothbore gun barrel is provided with a recoil connecting plate and a hydraulic buffer cylinder.

[0022] The platform height lifting system comprises a lifting platform, the lifting platform comprises a second truss, and the second truss is provided with a second docking plate, a truss vehicle lifting eye, a positioning tube and a third docking plate.

[0023] The initial water outlet angle adjustment system includes an angle adjustment mechanism.

[0024] The water surface evacuation system comprises a vacuum pump, through which the water pool environment is evacuated so that the water pool environment reaches the vacuum degree required by the test.

[0025] The wave making system comprises a wave making machine, through which a wave water surface is formed, and the wave water surface is made to meet the test requirements.

[0026] The model recovery system includes a model recovery frame, which includes a fourth truss. An upper panel is arranged on the top of the fourth truss, a side panel is arranged on the side of the fourth truss, and a lifting lug and an interception plate are arranged on the bottom of the fourth truss. The interception plate has two layers.

[0027] The test device also includes a water pool fixing frame and a guide column. The water pool fixing frame includes a third truss. The third truss is provided with a guide positioning cone, a fourth docking plate and a water pool positioning plate.

[0028] The smoothbore gun, the lifting platform and the pool fixing frame can be connected into a whole.

[0029] A scaled model test method for a supercavitating vehicle exiting water at a small angle comprises the following steps:

[0030] According to the similarity criteria of the scaled test, the geometric dimensions, mass and inertia of the navigation model are determined, and the initial water depth and preset water exit angle of the navigation model are determined;

[0031] By determining the speed of the navigation body model when it breaks through the sealing film of the nozzle and the air port pressure of the water surface environment, the Froude number and the cavitation number are similar.

[0032] According to the speed of the flying body model when it breaks through the sealing film of the tube mouth, combined with the mass of the flying body model, the effective length of the smoothbore gun barrel of the chamber is determined;

[0033] Load the navigation body model into the barrel of the smoothbore gun from the position of the chamber at the rear edge of the smoothbore gun, and then tighten the chamber; adjust the initial water depth through the lifting platform, and adjust the pre-test water angle through the angle adjustment mechanism;

[0034] The smoothbore gun is connected to the lifting platform and the lifting platform is connected to the fixed frame of the water pool by bolts, so that the smoothbore gun, the lifting platform and the fixed frame of the water pool become an organic whole;

[0035] Through numerical simulation and theoretical analysis, the possible ballistic dispersion of the supercavitating vehicle when it leaves the water at a small angle is evaluated, and a model recovery frame is arranged within its coverage area. Ropes are wrapped around the lifting ears of the model recovery frame to ensure that it can be freely dragged to the estimated area and fixed;

[0036] Turn on the vacuum pump to evacuate the pool environment. When the vacuum degree required by the test is reached, turn off the vacuum pump;

[0037] The wave maker is turned on to achieve the wave surface required by the test, and the camera is turned on at the same time to record the physical phenomenon of the supercavitation vehicle model moving in the water and the instability of the trajectory out of the water;

[0038] The ignition charge in the test chamber outside the water pool supplies electricity, which in turn ignites the main charge in the chamber. The high-temperature and high-pressure gas generated pushes the navigation model along the barrel of the smoothbore gun. The recoil generated in this process is offset by the hydraulic buffer cylinder to reduce the disturbance of the recoil to the lifting platform.

[0039] When the navigation body model moves to the leading edge of the smoothbore gun barrel, it breaks through the sealing membrane of the barrel mouth, moves at high speed in the water, and forms a supercavitation envelope; after the navigation body model passes through the wavy water surface, it penetrates the first layer of interception plate in the model recovery frame, and is finally effectively recovered by the second layer of interception plate.

[0040] The beneficial effects of the present invention are as follows:

[0041] The present invention has a compact and reasonable structure and is easy to operate. It can realize the depth adjustment of the initial water depth and the angle adjustment of the preset water exit angle when the navigation body moves underwater. In addition, a buffer capture device is designed to address physical phenomena such as ballistic instability that may occur when the navigation body exits the water at a small angle, so as to realize the effective recovery of the navigation body. At the same time, relying on the wave maker, camera, speed measurement line target, etc. built in the test site, it can simulate the wave sea conditions and record the supercavitation morphology and ballistic instability of the cross-domain air-water interface during the movement of the navigation body in the water. Physical phenomena, such as the test phenomenon and the internal and external measurement data can reveal the physical nature of the supercavitation navigation body in the process of exiting the water at a small angle, and can be used as a reference for standard model tests for numerical simulation research.

[0042] At the same time, the present invention also has the following advantages:

[0043] (1) Aiming at the deficiencies in the prior art, the present invention designs a scaled model test device that can realize the small-angle water exit of a supercavitating vehicle based on the similarity criteria and test principles of the scaled model test. The device is composed of a power system, a platform height lifting system, an initial water exit angle adjustment system, a water surface air evacuation system, a wave making system, a line target speed measurement system, a model recovery system, etc.

[0044] (2) Based on the test device, a set of systematic test methods has been formed, which can realize the depth adjustment of the initial water depth and the angle adjustment of the preset water exit angle when the navigation body moves underwater. In addition, a buffer capture device is designed to effectively recover the navigation body in view of physical phenomena such as ballistic instability that may occur when the navigation body exits the water at a small angle. At the same time, relying on the wave maker, camera, speed measurement line target, etc. built in the test site, it is possible to simulate the wave sea conditions and record the supercavitation morphology and ballistic instability of the cross-domain air-water interface during the movement of the navigation body in the water. The physical nature of the supercavitation navigation body in the process of exiting the water at a small angle can be revealed through the test phenomena and internal and external measurement data, so as to achieve the ultimate goal of creating the test method. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1It is the general layout diagram of the test device of the present invention.

[0046] Figure 2 It is a structural diagram of a smoothbore gun of the present invention.

[0047] Figure 3 It is a structural diagram of the lifting platform of the present invention.

[0048] Figure 4 It is a structural diagram of the fixed frame of the pool of the present invention.

[0049] Figure 5 This is a structural diagram of the model recovery framework of the present invention.

[0050] Figure 6 It is a schematic diagram of the positioning column of the present invention.

[0051] Among them: 1. Smoothbore gun; 101. Chamber; 102. Recoil connecting plate; 103. Hydraulic buffer cylinder; 104. Smoothbore gun barrel; 105. Nozzle sealing membrane; 106. Navigation body model; 107. Angle adjustment mechanism; 108. First truss; 109. First docking plate; 2. Lifting platform; 201. Second docking plate; 202. Truss car lifting eye; 203. Positioning cylinder; 204. Second truss; 205. Third docking plate; 3. Pool fixing frame; 301. Guide positioning cone; 302. Fourth docking plate; 303. Third truss; 304. Pool positioning plate; 4. Guide column; 5. Model recovery frame; 501. Upper panel; 502. Side panel; 503. Lifting eye; 504. Interceptor plate; 505. Fourth truss; 6. Wave water surface. DETAILED DESCRIPTION

[0052] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0053] like Figure 1-Figure 6 As shown, a scaled model test device for a supercavitating vehicle exiting the water at a small angle comprises multiple subsystems, including a power system, a platform height lifting system, an initial water exit angle adjustment system, a water surface evacuation system, a wave making system, a line target speed measurement system, a model recovery system, etc.

[0054] The power system includes a smoothbore gun 1, through which the navigation body model 106 is launched. The smoothbore gun 1 includes a medicine chamber 101, a recoil connecting plate 102, a hydraulic buffer cylinder 103, a smoothbore gun barrel 104, a nozzle sealing membrane 105, an angle adjustment mechanism 107, a first truss 108 and a first docking plate 109. The first docking plate 109 is arranged on the first truss 108 and is connected to the lifting platform 2 through the first docking plate 109. The two ends of the angle adjustment mechanism 107 are respectively connected to the first truss 108 and the smoothbore gun barrel 104, and the angle of the smoothbore gun barrel 104 is adjusted by the angle adjustment mechanism 107. The end of the smoothbore gun barrel 104 is provided with a medicine chamber 101, and the medicine chamber 101 is rotatably connected to the smoothbore gun barrel 104. The recoil connecting plate 102 and the hydraulic buffer cylinder 103 are arranged on the top of the smoothbore gun barrel 104.

[0055] The platform height lifting system includes a lifting platform 2, and the height of the smoothbore gun 1 is adjusted by the lifting platform 2. The lifting platform 2 includes a second truss 204, on which a second docking plate 201, a truss car lifting lug 202, a positioning tube 203 and a third docking plate 205 are arranged. The second docking plate 201 is connected to the first docking plate 109, so that the smoothbore gun 1 and the lifting platform 2 are connected. The truss car lifting lug 202 can be connected to the steel cable, and the lifting and lowering of the lifting platform 2 is realized by the tightness of the steel cable.

[0056] The initial water exit angle adjustment system includes an angle adjustment mechanism 107 , and the preset water exit angle of the navigation body model 106 is adjusted by adjusting the angle adjustment mechanism 107 .

[0057] The water surface evacuation system includes a vacuum pump, which is used to evacuate the pool environment so that the pool environment reaches the vacuum degree required by the test.

[0058] The wave making system comprises a wave making machine, through which a wave water surface 6 is formed, and the wave water surface 6 is made to meet the test requirements.

[0059] The line target speed measurement system includes a speed measurement line target, which is used to measure the speed of the navigation body model 106 .

[0060] The model recovery system includes a model recovery frame 5, which includes an upper panel 501, a side panel 502, a lifting lug 503, an interception plate 504 and a fourth truss 505. The lifting lug 503 is arranged at the bottom of the fourth truss 505, the upper panel 501 is arranged at the top of the fourth truss 505, the side panel 502 is arranged on the side of the fourth truss 505, and the fourth truss 505 is also provided with an interception plate 504, and the interception plate 504 is provided with two layers.

[0061] The test device also includes a pool fixing frame 3 and a guide column 4. The pool fixing frame 3 includes a guide positioning cone 301, a fourth docking plate 302, a third truss 303 and a pool positioning plate 304. The guide positioning cone 301, the fourth docking plate 302 and the pool positioning plate 304 are all arranged on the third truss 303, and the lifting platform 2 and the pool fixing frame 3 are connected by connecting the third docking plate 205 and the fourth docking plate 302.

[0062] The smoothbore gun 1, the lifting platform 2 and the pool fixing frame 3 can be connected into a whole.

[0063] During the test, the vacuum pump is first turned on to evacuate the pool environment. When the vacuum degree required by the test is reached, the vacuum pump is turned off; then the wave maker is turned on to achieve the wave water surface 6 required by the test, and the camera is turned on at the same time to record the physical phenomenon of the movement of the navigation body model 106 in the water and the instability of the out-of-water trajectory; the ignition charge in the test chamber 101 outside the pool is powered to ignite the main charge in the chamber 101, and the high-temperature and high-pressure combustion gas generated pushes the navigation body model 106 to move along the smoothbore gun barrel 104. The recoil force generated in this process is offset by the hydraulic buffer cylinder 103 to reduce the disturbance of the recoil force to the lifting platform 2; when the navigation body model 106 moves to the front edge of the smoothbore gun barrel 104, it breaks through the tube mouth sealing membrane 105, moves at high speed in the water, and forms a supercavitation coating; after the navigation body model 106 passes through the wave water surface 6, it breaks through the first layer of interception plate 504 in the model recovery frame 5, and is finally effectively recovered.

[0064] It can realize the depth adjustment of the initial water depth and the angle adjustment of the preset water exit angle when the navigation body moves underwater. In view of the physical phenomena such as ballistic instability that may occur when the navigation body exits the water at a small angle, a buffer capture device is designed to realize the effective recovery of the navigation body. At the same time, relying on the wave maker, camera, speed measurement line target, etc. built in the test site, it can simulate the wave sea conditions and record the supercavitation morphology and ballistic instability of the cross-domain air-water interface during the movement of the navigation body in the water. The physical nature of the supercavitation navigation body in the process of exiting the water at a small angle can be revealed through the test phenomena and internal and external measurement data, and it can be used as a reference for standard model tests for numerical simulation research.

[0065] In one embodiment, the present invention further provides a scaled model test method for a supercavitating vehicle exiting water at a small angle, comprising the following steps:

[0066] Determine the geometric size, mass, and inertia of the navigation body model 106 according to the geometric similarity, and determine the initial water depth and the preset water exit angle of the navigation body model 106;

[0067] The initial water depth is adjusted by adjusting the lifting platform 2, and the preset water outlet angle is adjusted by adjusting the angle adjustment mechanism 107 connected to the smoothbore gun 1;

[0068] The wave generator in the pool reaches the wave surface 6 to simulate the wave sea conditions;

[0069] By determining the speed of the navigation body model 106 when it breaks through the nozzle sealing film 105 and the air port pressure of the water surface environment, the Froude number and the cavitation number are similar;

[0070] According to the speed of the navigation body model 106 when breaking through the nozzle sealing film 105, combined with the mass of the navigation body model 106, the effective length of the smoothbore gun barrel 104 of the chamber 101 is determined;

[0071] Load the flying body model 106 into the barrel 104 of the smoothbore gun 1 from the position of the powder chamber 101 at the rear edge of the smoothbore gun 1, and then tighten the powder chamber 101;

[0072] Adjust the angle adjustment mechanism 107 so that the angle between the axis of the smoothbore gun barrel 104 and the wavy water surface 6 meets the preset water outlet angle;

[0073] The first docking plate 109 in the appendage structure of the smoothbore gun 1 is docked with the second docking plate 201 of the lifting platform 2;

[0074] The gantry crane eye 202 of the lifting platform 2 is connected to the gantry crane steel cable in the pool, and the gantry crane steel cable is used to pull the smoothbore gun 1 and the lifting platform 2 up and down along the guide column 4;

[0075] The lifting platform 2 moves under the traction of the gantry steel cable, and the positioning cylinder 203 on it slowly enters the guide positioning cone 301 on the fixed frame 3 of the pool; when the gantry steel cable is relaxed, the lifting platform 2 is completely seated;

[0076] The third docking plate 205 on the lifting platform 2 is docked with the fourth docking plate 302 on the water pool fixing frame 3 by bolts, so that the smoothbore gun 1, the lifting platform 2, and the water pool fixing frame 3 become an organic whole;

[0077] Through numerical simulation and theoretical analysis, the possible ballistic dispersion of the supercavitating vehicle when it leaves the water at a small angle is evaluated, and the model recovery frame 5 is arranged in its coverage area. The rope is wound around the ear 503 of the model recovery frame 5 to ensure that it can be freely dragged to the estimated area and fixed;

[0078] During the test, first turn on the vacuum pump to evacuate the pool environment. When the vacuum degree required by the test is reached, turn off the vacuum pump.

[0079] Then, a wave maker is turned on to achieve the wave water surface 6 required by the test, and a camera is turned on at the same time to record the physical phenomenon of the supercavitation vehicle model 106 moving in the water and the instability of the trajectory out of the water;

[0080] The ignition charge in the test chamber 101 outside the water pool supplies electricity, thereby igniting the main charge in the chamber 101. The high-temperature and high-pressure gas generated pushes the navigation body model 106 to move along the smoothbore gun barrel 104. The recoil force generated in this process is offset by the hydraulic buffer cylinder 103 to reduce the disturbance of the recoil force to the lifting platform 2.

[0081] When the navigation body model 106 moves to the front edge of the smoothbore gun barrel 104, it breaks through the tube mouth sealing membrane 105, moves at high speed in the water, and forms a supercavitation coating; after the navigation body model 106 passes through the wavy water surface 6, it breaks through the first layer of interception plate 504 in the model recovery frame 5, and is finally effectively recovered by the second layer of interception plate 504.

[0082] The test method based on the test device is a systematic study of the scaled-down model test of the supercavitating vehicle with a small-angle water exit. It is relatively complete and can serve as a guiding method for subsequent research in this field. The scaled-down model test of the supercavitating vehicle with a small-angle water exit conducted by this test method can be used as a standard model test for numerical simulation, which can further promote the progress of numerical simulation work.

[0083] The scaled model test method for supercavitating vehicles exiting the water at a small angle fills the gap in this field. The test method can adjust the depth of the initial water depth and the angle of the preset exit angle when the vehicle moves underwater. In addition, a buffer capture device is designed to effectively recover the vehicle in response to physical phenomena such as ballistic instability that may occur when exiting the water at a small angle. At the same time, relying on the wave maker, camera, speed measurement line target, etc. built in the test site, it is possible to simulate wave sea conditions and record physical phenomena such as supercavitation morphology and ballistic instability across the air-water interface during the movement of the vehicle in the water. Then, the physical nature of the supercavitating vehicle exiting the water at a small angle can be revealed through test phenomena and internal and external measurement data, achieving the ultimate goal of creating the test method.

[0084] In one embodiment, according to the similarity criterion of the scaled test, it is determined that the maximum characteristic diameter of the navigation body model 106 is 30 mm, the mass is 1.68 kg, the speed of the navigation body model 106 when breaking through the aluminum foil tube mouth sealing film 105 and entering the water is 50 m / s, the test water depth is 3 m, the water surface vacuum is 0.02 MPa, the preset water outlet angle is 9°, the wave height is 0.15 m, and the period is 0.6 s. According to relevant parameters, it can be determined that the inner diameter of the smoothbore gun barrel 104 is 30 mm, the effective length is 1.2 m, and the black powder in the chamber 101 is 2.2 g.

[0085] Before the test, load the navigation body model 106 into the barrel 104 of the smoothbore gun, and tighten the chamber 101 containing black powder and ignition powder from the rear edge of the smoothbore gun 1. Fix the aluminum foil tube mouth sealing film 105 to the muzzle of the smoothbore gun 1 through the flange. Adjust the angle adjustment mechanism 107 to ensure that the preset water outlet angle is 9°. The gantry steel cable passes through the gantry lifting lug 202 of the lifting platform 2, and slowly pulls the smoothbore gun 1 and the lifting platform 2 as a whole along the guide column 4, and docks with the fixed frame 3 of the pool. After the smoothbore gun 1, the lifting platform 2, and the fixed frame 3 of the pool are docked, fill the pool with water to ensure that the distance between the muzzle of the smoothbore gun 1 and the water surface is 3m.

[0086] During the test, the vacuum pump was turned on. When the vacuum degree of the water surface was drawn to 0.02MPa, the vacuum pump was turned off. Then, according to the preset parameters of the wave maker, the wave maker was turned on, and the wave height of the wave surface 6 was 0.15m and the wave period was 0.6s. A 5V voltage signal was given from the outside of the pool to ignite the ignition powder bag in the chamber 101, and then ignite 2.2g of black powder. The high-temperature and high-pressure gas generated pushed the navigation model 106 to accelerate in the smoothbore gun barrel 104. After accelerating for an effective length of 1.2m, the navigation model 106 broke through the aluminum foil tube mouth sealing film 105. At this time, the speed of the navigation model 106 was 50m / s. The high-speed cameras arranged inside and outside the pool recorded the supercavitation morphology of the navigation model 106 during its movement in the water and the physical phenomena such as ballistic instability that may occur when crossing the wave surface 6. Finally, the vehicle model 106 penetrated the first layer of interception plate 504 in the model recovery frame 5 and was effectively recovered, completing the scaled model test of the entire supercavitating vehicle exiting the water at a small angle.

[0087] In view of the deficiencies in the prior art, the present invention designs a scaled model test device that can realize the small-angle water exit of a supercavitating navigation body based on the similarity criteria and test principles of the scaled model test. The device consists of a power system, a platform height lifting system, an initial water exit angle adjustment system, a surface air evacuation system, a wave-making system, a line target speed measurement system, a model recovery system, etc. A set of systematic test methods is formed based on the test device, which can realize the depth adjustment of the initial water depth and the angle adjustment of the preset water exit angle when the navigation body moves underwater, and a buffer capture device is designed for physical phenomena such as ballistic instability that may occur when the navigation body exits the water at a small angle, so as to realize the effective recovery of the navigation body. At the same time, relying on the wave maker, camera, speed measurement line target, etc. built in the test site, the simulation of wave sea conditions can be realized and the physical phenomena such as supercavitation morphology and ballistic instability of the cross-domain air-water interface during the movement of the navigation body in the water can be recorded. Then, the physical nature of the supercavitating navigation body in the small-angle water exit process can be revealed through the test phenomena and internal and external measurement data, so as to achieve the ultimate purpose of creating the test method.

[0088] 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 scale model test device for a supercavitating vehicle exiting water at a small angle, characterized in that: include: A power system for launching the vehicle model (106); Platform height lifting system for adjusting the height; An initial water exit angle adjustment system cooperates with the platform height lifting system to adjust the initial water entry angle of the navigation body model (106); Water surface vacuum system, used for vacuuming the pool; A wave making system for making a wavy water surface (6); A line target speed measurement system, used to measure the speed of the navigation body model (106); The model recovery system is used to recover the navigation body model (106).

2. A scale model test device for a supercavitating vehicle exiting water at a small angle as claimed in claim 1, characterized in that: The power system comprises a smoothbore gun (1), the smoothbore gun (1) comprises a first truss (108), the first truss (108) is provided with an angle adjustment mechanism (107) and a first docking plate (109), the other side of the angle adjustment mechanism (107) is connected to a smoothbore gun barrel (104), a powder chamber (101) is provided at the end of the smoothbore gun barrel (104), and a recoil connection plate (102) and a hydraulic buffer cylinder (103) are provided at the top of the smoothbore gun barrel (104).

3. A scale model test device for a supercavitating vehicle exiting water at a small angle as claimed in claim 2, characterized in that: The platform height lifting system comprises a lifting platform (2), the lifting platform (2) comprises a second truss (204), the second truss (204) is provided with a second docking plate (201), a truss car lifting eye (202), a positioning tube (203) and a third docking plate (205).

4. A scale model test device for a supercavitating vehicle exiting water at a small angle as claimed in claim 3, characterized in that: The initial water outlet angle adjustment system comprises an angle adjustment mechanism (107).

5. A scale model test device for a supercavitating vehicle exiting water at a small angle as claimed in claim 4, characterized in that: The water surface evacuation system comprises a vacuum pump, through which the water pool environment is evacuated so that the water pool environment reaches the vacuum degree required by the test.

6. A scale model test device for a supercavitating vehicle exiting water at a small angle as claimed in claim 5, characterized in that: The wave-making system comprises a wave-making machine, through which a wavy water surface (6) is formed, and the wavy water surface (6) is made to meet test requirements.

7. A scale model test device for a supercavitating vehicle exiting water at a small angle as claimed in claim 6, characterized in that: The model recovery system comprises a model recovery frame (5), the model recovery frame (5) comprises a fourth truss (505), an upper panel (501) is arranged on the top of the fourth truss (505), a side panel (502) is arranged on the side of the fourth truss (505), and a lifting lug (503) and an intercepting plate (504) are also arranged on the bottom of the fourth truss (505), and the intercepting plate (504) is provided with two layers.

8. A scale model test device for a supercavitating vehicle exiting water at a small angle as claimed in claim 7, characterized in that: The test device also includes a pool fixing frame (3) and a guide column (4); the pool fixing frame (3) includes a third truss (303); and the third truss (303) is provided with a guide positioning cone (301), a fourth docking plate (302) and a pool positioning plate (304).

9. A scale model test device for a supercavitating vehicle exiting water at a small angle as claimed in claim 8, characterized in that: The smoothbore gun (1), the lifting platform (2) and the water pool fixing frame (3) can be connected into a whole.

10. A scale model test method for a supercavitating vehicle exiting water at a small angle, using the device of any one of claims 1 to 9, characterized in that: The steps include: According to the similarity criterion of the scaled-down test, the geometrical dimensions, mass and inertia of the navigation body model (106) are determined, and at the same time, the initial water depth and the preset water exit angle of the navigation body model (106) are determined; By determining the speed of the navigation body model (106) when it breaks through the nozzle sealing film (105) and the air port pressure of the water surface environment, the Froude number and the cavitation number are similar; According to the speed of the navigation body model (106) when breaking through the nozzle sealing film (105), combined with the mass of the navigation body model (106), the effective length of the smoothbore gun barrel (104) of the chamber (101) is determined; The navigation body model (106) is loaded into the barrel (104) of the smoothbore gun from the position of the chamber (101) at the rear edge of the smoothbore gun (1), and then the chamber (101) is tightened; the initial water depth is adjusted by the lifting platform (2), and the pre-test water angle is adjusted by the angle adjustment mechanism (107); The smoothbore gun (1) is connected to the lifting platform (2), and the lifting platform (2) is connected to the water pool fixing frame (3) by bolts, so that the smoothbore gun (1), the lifting platform (2), and the water pool fixing frame (3) become an organic whole; Through numerical simulation and theoretical analysis, the possible ballistic dispersion of the supercavitating vehicle when it leaves the water at a small angle is evaluated, and a model recovery frame (5) is arranged within its coverage area. A rope is wound around the lifting lug (503) of the model recovery frame (5) to ensure that it can be freely dragged to the estimated area and fixed; Turn on the vacuum pump to evacuate the pool environment. When the vacuum degree required by the test is reached, turn off the vacuum pump; Turning on a wave generator to achieve a wave surface (6) required by the test, and at the same time turning on a camera to record the movement of the supercavitation vehicle model (106) in the water and the physical phenomenon of instability of the trajectory out of the water; The ignition charge in the test chamber (101) outside the water pool is powered to ignite the main charge in the chamber (101), and the high-temperature and high-pressure combustion gas generated pushes the navigation body model (106) to move along the smoothbore gun barrel (104). The recoil force generated in this process is offset by the hydraulic buffer cylinder (103) to reduce the disturbance of the recoil force to the lifting platform (2); When the navigation body model (106) moves to the front edge of the smoothbore gun barrel (104), it breaks through the barrel mouth sealing membrane (105), moves at high speed in the water, and forms a supercavitation envelope; after the navigation body model (106) passes through the wave water surface (6), it breaks through the first layer of interception plates (504) in the model recovery frame (5), and is finally effectively recovered by the second layer of interception plates (504).

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