CN109916590B - Supercavitation generation and control device - Google Patents
Supercavitation generation and control device Download PDFInfo
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- CN109916590B CN109916590B CN201910196061.2A CN201910196061A CN109916590B CN 109916590 B CN109916590 B CN 109916590B CN 201910196061 A CN201910196061 A CN 201910196061A CN 109916590 B CN109916590 B CN 109916590B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000011521 glass Substances 0.000 claims abstract description 10
- 239000007921 spray Substances 0.000 claims abstract description 6
- 238000003466 welding Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 8
- 238000011160 research Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
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- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The supercavitation generation and control device comprises a transmitting device, a water tank, a cavitation generator and a waterway circulation device, wherein the cavitation generator comprises a jet spray pipe and a glass plate, a gap is arranged between an outlet of the jet spray pipe and the glass plate, and the gap is a cavitation water outflow port; the launching device comprises a high-pressure gas cylinder, a barometer, a high-pressure gas cylinder and a launching tube, wherein an outlet of the high-pressure gas cylinder is connected with an inlet of the high-pressure gas cylinder through a gas pipe, the barometer is arranged on the high-pressure gas cylinder, an outlet of the high-pressure gas cylinder is connected with the launching tube, and a navigation body model is positioned in the launching tube; the waterway circulation device comprises a centrifugal pump, straight pipes and bent pipes, wherein the straight pipes are connected with the bent pipes, the centrifugal pump is arranged between the two bent pipes, and the cavitation generator is arranged at the joint of one straight pipe and the water tank. The present invention can provide a supercavitation generation and control device for generating and collapsing supercavitation in different cavitation conditions for an underwater vehicle traveling at high speed.
Description
Technical Field
The invention belongs to the field of hydrodynamics and control of autonomous underwater vehicles, and particularly relates to a supercavitation generation and control device.
Background
The supercavitation navigation body is an underwater navigation body which can isolate the surface of the navigation body from fluid contact by forming a complete bubble layer around the underwater navigation body so as to reduce the fluid resistance of the navigation body and achieve the aim of acceleration.
Achieving high speed navigation is always the goal it is pursuing, whether for manned or unmanned underwater vehicles. Even the fastest conventional underwater vehicle is limited to speeds of around 40 m/s. The reason for this limitation is due to frictional drag generated on the surface of the aircraft. When an object moves in a fluid, the water stream layer will adhere to the surface of the object and drag it in the opposite direction of its movement. This interaction results in a large drag on the object, and this drag is commonly referred to as surface friction drag. In recent years, extensive research has been conducted in improving the speed of underwater vehicles. Most research has focused on simplifying the structure and improving the propulsion system of the aircraft. Although these methods have been shown to increase speed, the frictional resistance is not significantly reduced. The occurrence of supercavitation in an underwater vehicle is directly related to not only the vaporization pressure of the fluid, but also the size and number of nuclei in the liquid. The cavitation bubbles are in different shapes due to different flow field conditions, geometry of the moving body (head shape of the moving body-cavitation device) and the like. In recent years, some results have been achieved for the study of supercavitation, but the results obtained by experimental means are relatively few and the data are insufficient compared with the theoretical and numerical simulation aspects.
Disclosure of Invention
In order to overcome the defects of the prior art lacking in drag reduction test research and test of the underwater high-speed navigation body, the invention provides a supercavitation generation and control device capable of generating and collapsing supercavitation of the underwater navigation body running at high speed under different cavitation conditions.
The technical scheme adopted for solving the technical problems is as follows:
The supercavitation generation and control device comprises a transmitting device, a water tank, a cavitation generator and a waterway circulation device, wherein the cavitation generator comprises a jet spray pipe and a glass plate, a gap is arranged between an outlet of the jet spray pipe and the glass plate, and the gap is a cavitation water outflow port; the launching device comprises a high-pressure gas cylinder, a barometer, a high-pressure gas cylinder and a launching tube, wherein an outlet of the high-pressure gas cylinder is connected with an inlet of the high-pressure gas cylinder through a gas pipe, the barometer is arranged on the high-pressure gas cylinder, an outlet of the high-pressure gas cylinder is connected with the launching tube, and a navigation body model is positioned in the launching tube; the waterway circulation device comprises a centrifugal pump, straight pipes and bent pipes, wherein the straight pipes are connected with the bent pipes, the centrifugal pump is arranged between the two bent pipes, and the cavitation generator is arranged at the joint of one straight pipe and the water tank.
Further, the high-pressure cylinder is connected with the transmitting pipe and the transmitting pipe is connected with the water tank through flanges and threads.
Still further, the straight pipe and the bent pipe are connected through a flange and threads.
The water tank is connected with the other straight pipe through welding.
The front of the water tank is provided with a water hole sight glass.
Driving the model of the navigation body to accelerate in the launching tube, and enabling the model to obtain enough initial speed at the outlet of the launching tube to be ejected into the water tank; the initial velocity is used for realizing the required value of the model by changing the pressure of an initial air chamber of the high-pressure air cylinder, and the initial velocity is required to satisfy the following conditions:
Wherein V is the initial velocity of the model injected into the water; ρ is the model density; Is spring bottom pressure; l is the length of the model; l is the length of the transmitting tube; d is the diameter of the emitting tube.
The beneficial effects of the invention are mainly shown in the following steps: the drag reduction test research test of the underwater high-speed navigation body which is lacking at present is made up; the test platform can be used for generating and collapsing supercavitation of the underwater vehicle running at high speed under different cavitation conditions.
Drawings
Fig. 1 is a schematic diagram of a cavitation generator.
Fig. 2 is a schematic view of the emitting device and the water tank.
Fig. 3 is a schematic diagram of a supercavitation generation and control device.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 3, a supercavitation generation and control device includes a transmitting device 15, a water tank 8, a cavitation generator 14 and a waterway circulation device 13,
The cavitation generator 14 is constructed as shown in fig. 1, and includes a jet nozzle 2 and a glass sheet 1, with the jet striking the glass sheet 1 to generate cavitation bubbles.
The structure of the launching device 15 is shown in fig. 2, and the main structure of the launching device comprises a high-pressure gas cylinder 3, a barometer 4, a high-pressure gas cylinder 5 and a launching tube 6, wherein the high-pressure gas cylinder 3 directly uses gas in a compressed state as a power source, an outlet of the high-pressure gas cylinder 3 is connected with an inlet of the high-pressure gas cylinder 5 through a gas pipe, the barometer 4 is arranged on the high-pressure gas cylinder 5, an outlet of the high-pressure gas cylinder 5 is connected with the launching tube 6, a navigation body model 7 is driven to accelerate in the launching tube 6, and the model obtains enough initial speed at the outlet of the launching tube 6 and is launched into a water tank.
The high-pressure cylinder 5 is connected with the transmitting pipe 6 and the transmitting pipe 6 is connected with the water tank 8 through flanges and threads
The initial speed can be changed to conveniently realize the required value of the model by changing the pressure of an initial air chamber of the high-pressure air cylinder, and the initial speed is as follows:
Wherein V is the initial velocity of the model injected into the water; ρ is the model density; Is spring bottom pressure; l is the length of the model; l is the length of the transmitting tube; d is the diameter of the emitting tube.
The waterway circulation device is shown in fig. 3 and comprises a centrifugal pump 12, a straight pipe 10 and bent pipes 11, wherein the straight pipe 10 is connected with the bent pipes 11, the centrifugal pump 12 is arranged between the two bent pipes 11, and a cavitation generator 14 is arranged at the joint of one straight pipe and the water tank 8. The centrifugal pump 12 not only enables the water in the water tank 8 to be recycled, but also enables the cavitation bubbles generated by the cavitation bubble generator 14 to flow into the whole circulation system, so as to change the number of hollowness of the whole water tank 8. And the size of bubbles is controlled by changing the flow rate Q and the interval H of water flow. The cavitation generation system guides generated cavitation bubbles into the water inlet tank 8, so that the water in the water tank 8 has a certain bubble number.
The straight pipe 10 and the bent pipe 11 are connected through flanges and threads.
The water tank 8 is connected with the other straight pipe through welding.
The front of the water tank 8 is provided with a water hole sight glass 9, a high-speed photographing technology is adopted to observe the generation condition of bubbles around the navigation body, and the generation condition of supercavitation of the navigation body under different gasification conditions is studied.
The scheme of the embodiment makes up for the lack of drag reduction test research tests of the underwater high-speed navigation body at present. The device can provide a test platform for generating and collapsing supercavitation of an underwater vehicle running at a high speed under different cavitation conditions. The method provides an experimental foundation for researching the supercavitation drag reduction technology and the working efficiency of the underwater moving object and the subsequent experiment table design, simulation and simulation experiment.
The scope of the present invention includes, but is not limited to, the above embodiments, and any alterations, modifications, and improvements made by those skilled in the art are intended to fall within the scope of the invention.
Claims (4)
1. The supercavitation generation and control device is characterized by comprising a transmitting device, a water tank, a cavitation generator and a waterway circulation device, wherein the cavitation generator comprises a jet spray pipe and a glass plate, a gap is arranged between an outlet of the jet spray pipe and the glass plate, and the gap is a cavitation water outflow opening; the launching device comprises a high-pressure gas cylinder, a barometer, a high-pressure gas cylinder and a launching tube, wherein an outlet of the high-pressure gas cylinder is connected with an inlet of the high-pressure gas cylinder through a gas pipe, the barometer is arranged on the high-pressure gas cylinder, an outlet of the high-pressure gas cylinder is connected with the launching tube, and a navigation body model is positioned in the launching tube; the waterway circulation device comprises a centrifugal pump, straight pipes and bent pipes, wherein the straight pipes are connected with the bent pipes, the centrifugal pump is arranged between the two bent pipes, and the cavitation generator is arranged at the joint of one straight pipe and the water tank; the straight pipe and the bent pipe are connected through a flange and threads, and the water tank is connected with another straight pipe through welding.
2. The supercavitation generation and control device according to claim 1, wherein the high-pressure cylinder is connected with the transmitting pipe and the transmitting pipe is connected with the water tank through flanges and threads.
3. A supercavitation generation and control device according to claim 1 or 2, characterised in that a water tunnel mirror is provided on the front face of the tank.
4. A supercavitation generation and control device according to claim 1 or claim 2, wherein the model of the vehicle is driven to accelerate in the launch tube and to achieve a sufficient initial velocity of the model at the launch tube outlet into the tank; the initial velocity is used for realizing the required value of the model by changing the pressure of an initial air chamber of the high-pressure air cylinder, and the initial velocity is required to satisfy the following conditions:
Wherein V is the initial velocity of the model injected into the water; ρ is the model density; Is spring bottom pressure; l is the length of the model; l is the length of the transmitting tube; d is the diameter of the emitting tube.
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| CN201910196061.2A CN109916590B (en) | 2019-03-15 | 2019-03-15 | Supercavitation generation and control device |
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| CN201910196061.2A CN109916590B (en) | 2019-03-15 | 2019-03-15 | Supercavitation generation and control device |
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| CN114199507B (en) * | 2021-12-10 | 2023-06-09 | 哈尔滨工程大学 | Model device of navigation body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN209707063U (en) * | 2019-03-15 | 2019-11-29 | 浙江工业大学 | A kind of supercavity generates and control device |
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| JP2000272582A (en) * | 1999-03-26 | 2000-10-03 | Tech Res & Dev Inst Of Japan Def Agency | Underwater sailing body for scattering bubble |
| CN102322770B (en) * | 2011-09-14 | 2013-12-04 | 浙江理工大学 | Launching device for water super cavity and high-speed object to access water |
| CN202255829U (en) * | 2011-10-14 | 2012-05-30 | 浙江理工大学 | Combined water tank for researching gas jet in water and supercavity |
| CN204043888U (en) * | 2014-07-28 | 2014-12-24 | 浙江理工大学 | A kind of sail body band supercavity water outlet experimental provision of variable water tank volume |
| CN208108927U (en) * | 2018-04-13 | 2018-11-16 | 大连理工大学 | A kind of high pressure light-gas gun emitter of adjustable immersion angle degree |
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| CN209707063U (en) * | 2019-03-15 | 2019-11-29 | 浙江工业大学 | A kind of supercavity generates and control device |
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