CN108279114B - Vertical water inlet experimental device based on high-pressure light air cannon emission - Google Patents
Vertical water inlet experimental device based on high-pressure light air cannon emission Download PDFInfo
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- CN108279114B CN108279114B CN201810294761.0A CN201810294761A CN108279114B CN 108279114 B CN108279114 B CN 108279114B CN 201810294761 A CN201810294761 A CN 201810294761A CN 108279114 B CN108279114 B CN 108279114B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 238000002474 experimental method Methods 0.000 claims abstract description 21
- 238000013016 damping Methods 0.000 claims abstract description 7
- 230000006378 damage Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 229920001971 elastomer Polymers 0.000 description 6
- 239000000806 elastomer Substances 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
Abstract
A vertical water inlet experimental device based on high-pressure light air cannon emission belongs to the technical field of water inlet supercavitation experiments. The launching tube of the experimental device is internally provided with a bullet holder and a bullet body, the buffer mechanism and the air chamber are rigidly connected with the launching tube, the launching tube is provided with two circles of air inlet through holes at the part embedded into the air chamber, the lower part of the launching tube is provided with two circles of air outlet through holes, and the end part of the launching tube is provided with a muzzle buffer. One end of the connecting pipe is connected with the air storage tank, the other end is connected with the air chamber, and a pressure sensor is arranged on the connecting pipe. The high-pressure gas flows into the emission cylinder to control the flow, so that the stable and safe high-speed emission of the projectile body is realized, the high-pressure gas can be effectively prevented from being discharged from the outlet of the light gas gun, and the interference to the water-entering supercavitation experiment on the calm water surface is caused; the spring support is prevented from entering an experimental water area, and interference is avoided to experiments; the buffer mechanism and the damping mechanism can weaken vibration generated in the projectile body transmitting process, and damage to the experimental mechanism is avoided; has higher reliability, operability and safety.
Description
Technical Field
The invention relates to a vertical water inlet experimental device based on high-pressure light air cannon emission, and belongs to the technical field of water inlet supercavitation experiments.
Background
The light air cannon is a high-pressure power device with good performance, can emit the elastic bodies with different shapes and materials, and can meet the requirements of high-speed experiments, thereby having important roles in the water-entering supercavitation experiments.
The elastomer with special shape can cause rapid decrease of the pressure of the flow field of the surface accessory of the elastomer after being launched into water at high speed, the water of the surface accessory can be vaporized to form cavitation bubbles, and when the speed is enough, cavitation bubbles which completely wrap the elastomer are formed, which is called supercavitation bubbles. The light gas gun device is often applied to high-speed and ultra-high-speed emission experiments.
The light gas gun device uses high-pressure gas as power, and the high-pressure gas is introduced into the transmitting tube through a series of gas conduits, so that the high-pressure gas gun device can transmit the elastic bodies with different shapes and materials, the elastic bodies can be transmitted at high speed, and the requirement of high-speed experiments can be met.
The traditional multichannel type emission system is used for accelerating the emission of the projectile body by injecting high-pressure gas at one time, the flow rate of the injected high-pressure gas is not easy to control, the high-pressure gas is uneven relative to the flow rate of the projectile body, the projectile body is disturbed, the vibration of the projectile body in the emission cylinder is affected, the high-pressure gas is discharged through the emission outlet after the projectile body is accelerated to be emitted, the speed of the high-pressure gas is possibly higher than that of the accelerated projectile body, and the high-pressure gas radially reaches the water surface of the water inlet area due to the expansion of the outlet, so that the water surface with a larger area including the water inlet area of the projectile body is fluctuated, and adverse effects are caused when the experiment of calm water surface water inlet supercavitation is carried out. The size of the elastomer for the experiment is not suitable for being directly launched in the launching tube, so that a bullet holder matched with the launching tube is often used, and the problem of separation of the elastomer and the bullet holder can also cause interference to the experiment.
Disclosure of Invention
The invention aims to solve the problems that when high-pressure gas is injected into a transmitting cylinder in a vertical water inlet experiment of high-pressure light gas gun, the gas flow is not easy to control, and the vibration of a projectile body is caused by the non-uniformity of the influence on the projectile body, so that the stability and damage of experimental equipment are caused; meanwhile, the high-pressure gas at the outlet is likely to influence the free surface of the water inlet, and the experimental result is likely to be interfered; the separation of the projectile body from the projectile holder during the ejection of the projectile body.
The technical scheme adopted by the invention is as follows: the vertical water inlet experimental device comprises a gas storage tank, a connecting pipe and an emitting device supported by a supporting frame, wherein the connecting pipe is sequentially connected with a first connecting pipe, a second connecting pipe, an elbow, a third connecting pipe, a fourth connecting pipe, a pneumatic flange ball valve, a transfer pipe and a soft connecting pipe, the emitting device comprises a gas chamber, a buffer mechanism, a damping mechanism, an emitting barrel and a muzzle buffer, the supporting frame is fixed on an experimental platform through a cross beam, and the damping mechanism fixedly connected with the emitting barrel is arranged on a truss-type support of the supporting frame; the shell holder and the shell body are arranged in the transmitting cylinder, the buffer mechanism and the air chamber are rigidly connected with the transmitting cylinder, two circles of air inlet through holes are formed in the transmitting cylinder at the part embedded into the air chamber, two circles of air outlet through holes are formed in the lower part of the transmitting cylinder, and a muzzle buffer is arranged at the end part of the transmitting cylinder; a first connecting pipe at one end of the connecting pipe is connected with the air storage tank, a soft connecting pipe at the other end of the connecting pipe is connected with the air chamber, and a pressure sensor is arranged on a fourth connecting pipe; when an experiment is carried out, the pneumatic flange ball valve is opened first, high-pressure gas in the gas storage tank enters the gas chamber, part of the high-pressure gas enters the low-pressure gas formed in the buffer mechanism, the projectile body in the projectile holder is pushed to move downwards to gradually open two circles of air inlet through holes, the high-pressure gas in the gas chamber enters the launching cylinder, the projectile holder and the projectile body are pushed to move downwards at a high speed, and when the two circles of air outlet through holes are opened for exhausting, the muzzle buffer at the end part of the launching cylinder keeps the projectile holder in the launching cylinder and only launches the projectile body.
The number of the through holes is 12, and the through holes are distributed on the wall of the part of the launching cylinder embedded into the air chamber in a two-layer annular manner; the sum of the areas of the through holes is larger than the cross-sectional area of the transmitting cylinder.
The outlet end of the transmitting cylinder is equally divided into two layers of annular uniformly distributed 12 through holes, and the sum of the areas of the through holes is larger than the cross section area of the transmitting cylinder.
The invention has the following advantages:
1. the flow control is carried out on the high-pressure gas flowing into the transmitting cylinder, so that the process of stable and safe high-speed transmitting of the projectile body is realized, and the influence of vibration and the like of the projectile body in the transmitting cylinder is avoided;
2. the high-pressure gas is discharged in advance, so that the discharge of the high-pressure gas from the outlet of the light gas gun can be effectively prevented, and the interference to the water-entering supercavitation experiment requiring calm water surface is caused;
3. the gun muzzle buffer is arranged at the tail end of the launching barrel, so that the projectile body and the projectile support can be separated in time, and the projectile support is prevented from entering an experimental water area to cause interference to an experiment;
4. the buffer mechanism and the damping mechanism are arranged, so that vibration generated in the projectile body transmitting process can be weakened, and the experiment mechanism is prevented from being damaged;
5. the soft connecting pipe is used for connecting the transmitting mechanism and the gas transmission mechanism, so that the vibration of the transmitting mechanism does not influence the gas transmission mechanism, and the gas transmission mechanism is damaged;
6. the pneumatic flange ball valve is used as a switch for controlling the on-off of high-pressure gas, and has high reliability, operability and safety.
Drawings
FIG. 1 is a block diagram of a vertical water entry experimental device based on high pressure light air cannon firing.
Fig. 2 is an enlarged view a in fig. 1.
FIG. 3 is a schematic illustration of the movement of a projectile in a launch tube.
FIG. 4 is a schematic view of the movement of a low pressure gas-propelled projectile.
FIG. 5 is a schematic illustration of the flow of high pressure gas into the cartridge during the firing of the projectile.
FIG. 6 is a schematic illustration of the discharge of high pressure gas as the projectile and sabot move to the outlet end of the light gas cannon barrel.
In the figure: 1. the air storage tank, the No. 2 connecting pipe, the No. 3 connecting pipe, the No. two connecting pipes, the elbow, the No. 5 connecting pipe, the No. 5a connecting pipe, the pressure sensor, the No. 6 connecting pipe, the No. 7 connecting pipe, the pneumatic flange ball valve, the No. 8 connecting pipe, the switching pipe, the No. 9 connecting pipe and the soft connecting pipe, 10, an air chamber, 11, a buffer mechanism, 12, a through hole, 13, a shock absorption mechanism, 14, a firing barrel, 15, a supporting frame, 16, a projectile body, 17, a through hole, 18, a muzzle buffer, 19, a cross beam, 20 and a projectile holder.
Detailed Description
Fig. 1 and 2 show the structure diagrams of a vertical water inlet experimental device based on the emission of a high-pressure light gas gun. In the figure, the vertical water inlet experimental device based on the high-pressure light air cannon emission comprises a gas storage tank 1, a connecting pipe and an emission device supported by a supporting frame 15. The connecting pipes are sequentially connected by a first connecting pipe 2, a second connecting pipe 3, an elbow 4, a third connecting pipe 6, a fourth connecting pipe 5, a pneumatic flange ball valve 7, a switching pipe 8 and a soft connecting pipe 9. The firing means comprises an air chamber 10, a cushioning mechanism 11, a cushioning mechanism 13, a firing barrel 14 and a muzzle buffer 18. The support frame 15 is fixed on the experiment platform through the crossbeam 19, and the damper 13 fixedly connected with the launching tube 14 is arranged on a truss type support of the support frame 15. The projectile holder 20 and the projectile body 16 are arranged in the launching barrel 14, the buffer mechanism 11 and the air chamber 10 are rigidly connected with the launching barrel 14, the launching barrel 14 is provided with two circles of air inlet through holes 12 at the part embedded into the air chamber 10, the lower part of the launching barrel 14 is provided with two circles of air outlet through holes 17, and the end part is provided with a muzzle buffer 18. The first connecting pipe 2 at one end of the connecting pipe is connected with the air storage tank 1, the soft connecting pipe 9 at the other end of the connecting pipe is connected with the air chamber 10, and the fourth connecting pipe 5 is provided with a pressure sensor 5a. When an experiment is carried out, the pneumatic flange ball valve 7 is opened firstly, high-pressure gas in the gas storage tank 1 enters the gas chamber 10, part of the high-pressure gas enters low-pressure gas formed in the buffer mechanism 11, the projectile 16 in the projectile support 20 is pushed to move downwards to gradually open two circles of gas inlet through holes 12, the high-pressure gas in the gas chamber 10 enters the launching cylinder 14, the projectile support 20 and the projectile 16 are pushed to move downwards at a high speed, and when the two circles of gas outlet through holes 17 are opened for exhausting, the muzzle buffer 18 at the end part of the launching cylinder 14 keeps the projectile support 20 in the launching cylinder 14 and only launches the projectile 16.
Compressed air is introduced into the air storage tank 1 before the experiment starts, at the moment, the pneumatic flange ball valve 7 is closed, and air pressure value feedback can be obtained through the pressure sensor 5a arranged on the perforated connecting pipe. The pneumatic flange ball valve 7 is opened to supply high pressure gas to the launch canister 14.
Figures 3, 4, 5, and 6 illustrate the entire experimental procedure, with the projectile 16 and sabot 20 being moved by first introducing a low pressure gas into the barrel 14 (as shown in figure 4). When the projectile 16 and the sabot 20 move into the through hole 12 (as shown in fig. 5), high pressure gas is introduced therewith to push the projectile 16 and the sabot 20 into accelerating motion. When the high pressure gas pushes the projectile body 16 and the projectile holder 20, a reaction force is generated to the experimental mechanism, so that the buffer mechanism 11 is used, and a part of recoil force can be counteracted, so that the experimental mechanism is prevented from vibrating with larger amplitude. At the same time, the damping mechanism 13 is used to further attenuate the overall vibration. As the projectile 16 and the projectile support 20 further accelerate, the number of through holes connecting the launching tube 14 with the air chamber 6 increases, the flow channels of the air are more, the high-pressure air further enters the launching tube 14, and the projectile 16 and the projectile support 20 move at a high speed; when the projectile 16 and the projectile holder 20 move to the first circle of air holes of the through hole 17 (as shown in fig. 6), high-pressure air is discharged outwards from the air holes due to the normal pressure state outside the pipe, when the projectile 16 and the projectile holder 20 further move to the second circle of air holes, the flow channels of the air are more, the rest high-pressure air can be almost completely discharged, a muzzle buffer 18 is fixed at the outlet end of the launching pipe 14, the projectile holder 20 and the projectile 16 can be separated, and when the projectile holder 20 moves to the position, the projectile holder 20 stays in the launching pipe, and the projectile 16 is launched at high speed.
The rectangular through holes 12 need to be uniformly distributed, so that vibration of the light air gun launching tube 14 caused by inconsistent air flow directions at two sides is avoided, the number of the through holes 12 is 12, and the total area of the through holes 12 is larger than the cross-sectional area of the launching tube 14. The through holes 17 are required to be uniformly distributed, so that the purpose of discharging high-pressure gas in advance is to avoid the influence of high-pressure gas impact sleep on experimental results, the number of the through holes 17 is 12, and the total area of the through holes 17 is larger than the cross-sectional area of the transmitting cylinder 17.
The upper and lower rubber sealing rings are arranged on the bullet holder 20, and the proper size is selected, so that a good sealing effect can be achieved, and the bullet body 16 and the bullet holder 20 can be kept at the initial positions by means of static friction force.
The buffer mechanism 11 can play the effect of counteracting the recoil force when the light air cannon is launched, prevents that the device from producing big vibration, and damper 13 can further weaken the vibration of structure, prevents that the structure from receiving the destruction.
Claims (1)
1. Vertical water inlet experimental device based on high-pressure light gas gun emission, it includes gas holder (1), connecting pipe and the emitter who is supported by support frame (15), the connecting pipe adopts connecting pipe (2), no. two connecting pipes (3), elbow (4), no. three connecting pipes (6), no. four connecting pipes (5), pneumatic flange ball valve (7), switching pipe (8) and soft connecting pipe (9) to connect gradually, characterized by: the launching device comprises an air chamber (10), a buffer mechanism (11), a damping mechanism (13), a launching tube (14) and a muzzle buffer (18), wherein the supporting frame (15) is fixed on an experimental platform through a cross beam (19), and the damping mechanism (13) fixedly connected with the launching tube (14) is arranged on a truss-type support of the supporting frame (15); the projectile holder (20) and the projectile body (16) are arranged in the launching tube (14), the buffer mechanism (11), the air chamber (10) and the launching tube (14) are rigidly connected, two circles of air inlet through holes (12) are formed in the part of the launching tube (14) embedded in the air chamber (10), two circles of air outlet through holes (17) are formed in the lower part of the launching tube (14), and a muzzle buffer (18) is arranged at the end part of the launching tube; a first connecting pipe (2) at one end of the connecting pipe is connected with the air storage tank (1), a soft connecting pipe (9) at the other end of the connecting pipe is connected with the air chamber (10), and a pressure sensor (5 a) is arranged on a fourth connecting pipe (5); when an experiment is carried out, firstly, a pneumatic flange ball valve (7) is opened, high-pressure gas in a gas storage tank (1) enters a gas chamber (10), part of the high-pressure gas enters low-pressure gas formed in a buffer mechanism (11), a projectile body (16) in a projectile holder (20) is pushed to move downwards to gradually open two circles of gas inlet through holes (12), the high-pressure gas in the gas chamber (10) enters a launching cylinder (14), the projectile holder (20) and the projectile body (16) are pushed to move downwards at a high speed, and when the two circles of gas outlet through holes (17) are opened for exhausting, a muzzle buffer (18) at the end part of the launching cylinder (14) keeps the projectile holder (20) in the launching cylinder (14) and only launches the projectile body (16);
the number of the air inlet through holes (12) is 12, and the air inlet through holes are distributed on the wall of the part of the air chamber (10) embedded with the transmitting cylinder (14) in a two-layer annular manner; the sum of the areas of the through holes (12) for air intake is larger than the cross-sectional area of the transmitting cylinder (14);
the number of the exhaust through holes (17) is 12, and the exhaust through holes are distributed on the wall of the tail end of the transmitting cylinder in a two-layer annular manner; the sum of the areas of the through holes (17) for the exhaust is larger than the cross-sectional area of the emission cylinder (14).
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| CN201810294761.0A CN108279114B (en) | 2018-04-04 | 2018-04-04 | Vertical water inlet experimental device based on high-pressure light air cannon emission |
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| CN201810294761.0A CN108279114B (en) | 2018-04-04 | 2018-04-04 | Vertical water inlet experimental device based on high-pressure light air cannon emission |
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| CN108279114B true CN108279114B (en) | 2023-12-19 |
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| CN111413066B (en) * | 2020-04-09 | 2021-10-26 | 西北工业大学 | Load-reducing model experiment launching device |
| CN112710192B (en) * | 2020-12-31 | 2022-12-20 | 北京博联马赫科技有限公司 | Novel high-pressure releasing device for gas gun launching |
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