Pressure stabilizing and loading system for cavitation bubble water tunnel experimental device

Abstract

A pressure stabilizing and loading system for a cavitation bubble water tunnel experiment device comprises a fluid loading tank and an air pressure loading unit, the air pressure loading unit comprises an air supply device, a pressure stabilizing cylinder and a pressure stabilizing and loading device, the pressure stabilizing cylinder is provided with a cylinder body and an elastic diaphragm arranged in the cylinder body, a first cavity is located in the elastic diaphragm, and a second cavity is located in the elastic diaphragm. Air conveyed by the air supply device is fed into the fluid loading tank through the first cavity, and the pressure stabilizing loading device is connected with the pressure stabilizing cylinder and conveys air into the second cavity so that the air pressure in the first cavity can be the same as the air pressure in the second cavity. According to the embodiment of the invention, in the process of loading the air into the fluid loading tank, the air passes through the pressure stabilizing cylinder, and the elastic diaphragm in the pressure stabilizing cylinder can eliminate the pulse pressure of the filled air, so that the pressure of the high-pressure gas in the fluid loading tank is kept stable, and the experimental water is stably pressed to the water tunnel device.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid mechanics experimental equipment, and in particular relates to a pressure-stabilizing loading system for a cavitation water tunnel experimental device. Background Art

[0002] The cavitation water tunnel is a main equipment used for fluid dynamics research and observation of cavitation phenomena. Its main uses include three aspects: first, it is used for ship propulsion performance research. It can simulate different working conditions of propellers, observe the generation, development and collapse of cavitation, help optimize propeller design, reduce cavitation erosion and improve propulsion efficiency; second, it serves hydrodynamic research. It can simulate the water flow conditions of underwater vehicles at different speeds and postures, and study the flow characteristics of objects; third, it is beneficial to the performance research of underwater weapons. It can simulate the navigation state of torpedoes, explore the impact of cavitation on its stability and find ways to improve it. It can also study how to reduce the noise generated by cavitation and enhance the concealment of weapons.

[0003] With the development of underwater hypervelocity weapons and the need for research on hypervelocity fluid dynamics, cavitation water tunnels are developing towards high flow rate, low noise and precise control of flow field. At present, most cavitation water tunnel devices at home and abroad use water pumps to accelerate the fluid. This loading method has the following defects: 1. The water pump motor unit will generate violent vibrations during startup and operation, and the vibrations will be transmitted to the experimental section through the pipe wall, affecting the structural stability; 2. The water pump unit will generate huge noise during operation, thus affecting the noise measurement; 3. The fluid will generate disturbances and turbulence when passing through the water pump, greatly reducing the quality of the flow field; 4. The water pump loading will generate pulsating pressure due to the action of the impeller, affecting the pressure stability of the experimental section.

[0004] In order to solve the above-mentioned defects of loading fluid with water pump, a method of loading fluid with air pressure has emerged, which eliminates the vibration caused by the operation of the water pump and the disturbance and turbulence caused by the action on the fluid. However, the method of loading fluid with air pressure requires maintaining the pressure of the gas and continuously replenishing the gas. The gas filled in during the inflation process still has a pulse pressure, which leads to the instability of the pressure of the high-pressure gas and cannot stably load the fluid into the water tunnel device. Summary of the invention

[0005] In view of the deficiencies existing in the related art, the present invention provides a pressure-stabilizing loading system for a cavitation water tunnel experimental device to solve the problem of unstable loading caused by pulse pressure of the current air pressure loading fluid.

[0006] The present invention provides a pressure-stabilizing loading system for a cavitation water tunnel experimental device, comprising: A fluid loading tank, which contains experimental water and is connected to the water tunnel device; The air pressure loading unit is connected to the fluid loading tank and is used to fill air into the fluid loading tank, so that the experimental water therein is loaded into the water tunnel device under the pressure of the high-pressure air; The pneumatic loading unit includes: Gas supply device; The pressure stabilizing cylinder comprises a cylinder body and an elastic diaphragm installed in the cylinder body. The elastic diaphragm is tubular and divides the space inside the cylinder body into a first chamber and a second chamber. The first chamber is located inside the elastic diaphragm, and the second chamber is located outside the elastic diaphragm and is arranged around the first chamber. The air delivered by the air supply device is delivered into the fluid loading tank through the first chamber. The pressure-stabilizing loading device is connected to the pressure-stabilizing cylinder and delivers gas to the second chamber so as to make the gas pressure in the first chamber the same as the gas pressure in the second chamber.

[0007] In some embodiments, the density of the gas filled into the second chamber by the pressure-stabilizing loading device is less than that of air.

[0008] In some of the embodiments, the air supply device includes an air compressor and an air storage tank connected to the air compressor, and the air storage tank is connected to the first chamber.

[0009] In some embodiments, ports at both ends of the elastic diaphragm are fixedly mounted on end plates at both ends of the cylinder, and both end plates are provided with vents coaxially arranged with the elastic diaphragm; One vent is connected to the air supply device through an air inlet pipe, and the other vent is connected to the fluid loading tank through an air supply pipe. Both the air inlet pipe and the air supply pipe are coaxially arranged with the elastic diaphragm.

[0010] Experimental Water in the Fluid Loading Tank There is an oil film on the water surface of the experimental water in the fluid loading tank to separate the experimental water from the air.

[0011] In some of the embodiments, a rectifying grid is installed in the fluid loading tank, the rectifying grid is located in the experimental water and above the output port provided in the fluid loading tank, and the output port is connected to the water tunnel device.

[0012] In some of the embodiments, a water storage tank and a water return pump are further included, the water tunnel device and the fluid loading tank are both connected to the water storage tank, and the water return pump pumps the water sent into the water storage tank by the water tunnel device back to the fluid loading tank.

[0013] In some of the embodiments, an industrial computer is further included, a gas charging valve is installed on the pipeline between the gas supply device and the pressure stabilizing cylinder, a pressure stabilizing valve is installed on the pipeline between the pressure stabilizing loading device and the pressure stabilizing cylinder, a loading pressure gauge is installed on the fluid loading tank, a pressure stabilizing pressure gauge for measuring the air pressure of the second chamber is installed on the pressure stabilizing cylinder, and a loading valve is installed on the pipeline between the fluid loading tank and the water tunnel device; The industrial computer is electrically connected to the air supply device, the charging valve and the loading pressure gauge. The industrial computer measures the loading air pressure in the fluid loading tank through the loading pressure gauge. When the loading air pressure is lower than the set pressure value, the industrial computer opens the charging valve and controls the air supply device to charge the fluid loading tank until the loading air pressure reaches the set pressure value and the charging valve is closed. The industrial computer is electrically connected to the loading valve, the industrial computer opens the pressure stabilizing valve and controls the pressure stabilizing loading device to inflate the second chamber until the pressure value measured by the pressure stabilizing barometer reaches the set pressure value, and then closes the pressure stabilizing valve; The industrial computer is electrically connected to the loading valve, and after the air pressure value of the loading pressure gauge and the air pressure value of the pressure-stabilizing pressure gauge both reach the set pressure value, the industrial computer opens the loading valve.

[0014] In some of the embodiments, when the industrial computer opens the loading valve, it controls the opening and closing of the inflation valve and the operation of the air supply device, and replenishes air to the fluid loading tank so that the loading air pressure is maintained at a set pressure value.

[0015] In some embodiments, a loading level gauge is installed on the fluid loading tank, and the industrial computer is electrically connected to the loading level gauge. When the loading level gauge measures that the liquid level of the experimental water drops to a minimum liquid level threshold, the industrial computer closes the loading valve.

[0016] Compared with the prior art, the beneficial effect of the present application is that in the process of loading air into the fluid loading tank in the embodiment of the present invention, the air passes through the pressure stabilizing cylinder, and the elastic diaphragm in the pressure stabilizing cylinder can eliminate the pulse pressure of the filled air, so that the pressure of the high-pressure gas in the fluid loading tank remains stable, and the experimental water is stably pressed toward the water tunnel device, which solves the problem of unstable loading caused by the pulse pressure of the current air pressure loading fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a structural schematic diagram of a pressure-stabilizing loading system for a cavitation water tunnel experimental device of the present invention; Figure 2 It is a structural schematic diagram of a pressure stabilizing cylinder in a pressure stabilizing loading system for a cavitation water tunnel experimental device of the present invention; In the figure: 1. Fluid loading tank; 11. Experimental water; 12. Oil film; 13. Rectifier grid; 14. Output port; 15. Loading pressure gauge; 16. Loading liquid level gauge; 17. Loading valve; 2. Air pressure loading unit; 21. Air supply device; 211. Air compressor; 212. Air storage tank; 22. Pressure stabilizing cylinder; 221. Cylinder; 222. Elastic diaphragm; 223. First chamber; 224. Second chamber; 225. End plate; 226. Air vent; 23. Pressure stabilizing loading device; 24. Air inlet pipe; 25. Air supply pipe; 26. Inflating valve; 27. Pressure stabilizing valve; 28. Pressure stabilizing barometer; 3. Water tunnel device; 4. Water storage tank; 5. Return water pump; 6. Industrial computer. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Fluid loading tank 1 and fluid loading tank 1 and air pressure loading unit 2. The fluid loading tank 1 contains experimental water 11 and is connected to the water tunnel device 3 through a pipeline. The air pressure loading unit 2 is connected to the fluid loading tank 1 and the air pressure loading unit 2.

[0023] The fluid loading tank 1 contains experimental water 11 and is connected to the water tunnel device 3 through a pipeline. The air pressure loading unit 2 is connected to the fluid loading tank 1. The air pressure loading unit 2 includes an air supply device 21 and a pressure stabilizing cylinder 22. The pressure stabilizing cylinder 22 has a cylinder 221 and an elastic diaphragm 222 installed in the cylinder 221. The elastic diaphragm 222 is tubular and divides the space inside the cylinder 221 into a first chamber 223 and a second chamber 224. The first chamber 223 is located inside the elastic diaphragm 222, and the second chamber 224 is located outside the elastic diaphragm 222 and is arranged around the periphery of the first chamber 223. The pressure stabilizing loading device 23 is connected to the pressure stabilizing cylinder 22, so as to transport gas to the second chamber 224, so that the air pressure in the first chamber 223 is the same as the air pressure in the second chamber 224.

[0024] The air supply device 21 is connected to the pressure stabilizing cylinder 22 through a pipeline, and the pressure stabilizing cylinder 22 is connected to the fluid loading tank 1 through a pipeline. The air supply device 21 conveys gas to the first chamber 223 in the pressure stabilizing cylinder 22, thereby sending air into the fluid loading tank 1 through the first chamber 223, so that the air in the fluid loading tank 1 is in a high-pressure state, and the valve installed on the pipeline between the water tunnel device 3 and the fluid loading tank 1 is opened. Under the action of high-pressure air, the experimental water 11 in the fluid loading tank 1 is pressed out and pressed into the water tunnel device 3 at a stable speed, and flows through the model placed in the water tunnel device 3, so as to realize the observation of the fluid state of the fluid passing through the model, thereby studying the fluid dynamics characteristics of different models.

[0025] The air supply device 21 inflates the fluid loading tank 1 through the pressure stabilizing cylinder 22, so that the air in the fluid loading tank 1 is in a high-pressure state, and the high-pressure air presses the experimental water 11 in the fluid loading tank 1 into the water tunnel device 3. The air supply device 21 is far away from the water tunnel device 3, and the vibration and noise generated by its operation are difficult to be transmitted to the water tunnel device 3, and will not affect the fluid experiment conducted in the water tunnel device 3. When the air supply device 21 is inflated, a pulse pressure is generated in the air. In the process of filling the air into the fluid loading tank 1, the air passes through the first chamber 223 of the pressure stabilizing cylinder 22, that is, the air passes through the pressure stabilizing cylinder 22 axially from the internal space of the elastic diaphragm 222. The elastic diaphragm 222 forms an all-round covering for the air flowing through, and expands or contracts under the action of the pulse pressure in the air, so that it is wavy in the axial direction, fully buffers the air passing through at multiple angles, and transmits the pulse pressure in the air 360 degrees radially outward to the second chamber 224, thereby eliminating the pulse pressure, so that the gas pressure reaching the fluid loading tank 1 can be within a stable range, meet the demand for stable loading energy, and make the experimental water 11 stably output from the fluid loading tank 1 and sent to the water tunnel device 3. During the fluid experiment, as the water level in the fluid loading tank 1 drops, the air supply device 21 continuously replenishes air into the fluid loading tank 1 to ensure the stability of the internal air pressure, so as to continuously and stably output the water flow. In addition, the elastic diaphragm 222 covers the flowing air in all directions and prevents the air from contacting the inner wall of the cylinder 221 when entering the first chamber 223, thereby eliminating the direct effect of air pressure on the cylinder 221, preventing it from deforming or even vibrating under pressure, ensuring the stability of the pressure stabilizing cylinder 22, and preventing the vibration caused by the air pressure on the pressure stabilizing cylinder 22 from affecting the fluid experiment.

[0026] Among them, the pressure-stabilizing loading device 23 is a storage tank storing high-pressure gas. By controlling the valve installed on the pipeline connected to the pressure-stabilizing cylinder 22 to open, the gas can flow from the pressure-stabilizing loading device 23 on the high-pressure side to the second chamber 224 on the low-pressure side, thereby filling the gas from the pressure-stabilizing loading device 23 into the second chamber 224. When the gas pressure in the second chamber 224 is the same as the set pressure value, the valve is closed and the inflation into the second chamber 224 is stopped, so that the gas pressure in the second chamber 224 is maintained at the set pressure value. The air supply device 21 inflates and pressurizes the fluid loading tank 1, so that the air pressure therein is maintained at a set pressure value, and the air pressure of the first chamber 223 connected to the fluid loading tank 1 is also the set pressure value, so that the air pressure in the first chamber 223 is the same as the air pressure in the second chamber 224, avoiding the elastic diaphragm 222 always being in a state of deformation to one side due to the air pressure difference between the inner and outer chambers, so that the elastic diaphragm 222 is always in an inward or outward tension state, and it is difficult to produce corresponding expansion or contraction under the action of pulse pressure, so as to ensure that when pulse pressure or pressure instability occurs, the elastic diaphragm 222 will expand or contract with the change of pressure, effectively absorb and diffuse the pulse pressure in the air, keep the internal pressure of the first chamber 223 stable, and thus ensure the stability of the internal air pressure of the fluid loading tank 1. In order to ensure that the gas is filled into the second chamber 224, an air pump can be installed on the pipeline between the pressure stabilizing loading device 23 and the pressure stabilizing cylinder 22, so that the air in the pressure stabilizing loading device 23 can be pumped into the second chamber 224.

[0027] In the above-mentioned exemplary embodiment, the pressure-stabilizing loading system for the cavitation water tunnel experimental device uses the air supply device 21 to fill air into the fluid loading tank 1, so that the pressure of the air in the fluid loading tank 1 reaches the set pressure value of the high pressure, thereby using the high-pressure air to press out the experimental water 11 in the fluid loading tank 1, and realize the loading of the experimental water 11 to the water tunnel device 3, eliminating the vibration, noise, turbulence and pulse pressure problems caused by water pump loading. When the fluid loading tank 1 is inflated, the injected air passes through the pressure-stabilizing cylinder 22. The elastic diaphragm 222 surrounding the circulating air in the pressure-stabilizing cylinder 22 can eliminate the pulse pressure in all directions, so that the pressure of the high-pressure gas in the fluid loading tank 1 remains stable, and the experimental water 11 is stably pressed toward the water tunnel device 3, which solves the problem of unstable loading caused by the pulse pressure of the current air pressure loading fluid.

[0028] In some embodiments, the density of the gas filled into the second chamber 224 by the pressure-stabilizing loading device 23 is lower than that of air. The pressure-stabilizing loading device 23 fills the second chamber 224 with a gas having a density lower than that of air, such as hydrogen or helium, so that when the air pressure inside and outside the elastic diaphragm 222 is the same, the density of the gas inside the elastic diaphragm 222 is ensured to be greater than that outside the elastic diaphragm 222, so that when the elastic diaphragm 222 expands outwards and causes the space of the second chamber 224 to decrease, the gas inside the second chamber 224 will not be compressed to cause its density to be greater than that of the air in the first chamber 223, thereby avoiding the obstruction of the outward expansion of the elastic diaphragm 222 due to the increase of the density of the gas outside the elastic diaphragm 222 to be higher than that of the air inside the elastic diaphragm 222, ensuring that the elastic diaphragm 222 is deformed toward the second chamber 224 under the action of the pulse pressure of the air, ensuring that when pulse pressure or pressure instability occurs, the elastic diaphragm 222 will expand or contract with the change of pressure, keep the pressure inside the first chamber 223 stable, and effectively eliminate the pulse pressure. In addition, the gas with a density less than that of air provides upward support around the elastic diaphragm 222, which can prevent the elastic diaphragm 222 from bending downward under the action of its own weight, so that the elastic diaphragm 222 does not need to be tensioned when fixed in the voltage-stabilizing tube. The elastic diaphragm 222 can have a larger radial range of motion under the action of pulse pressure, and can more effectively eliminate the pulse pressure in the air flowing through.

[0029] In some embodiments, the pressure-stabilizing loading device 23 is disposed below the pressure-stabilizing tube 22, so that the gas is filled into the second chamber 224 from bottom to top. Since the density of the filled gas is lower than that of air, the gas will also float up and enter the second chamber 224, thereby increasing the efficiency of the gas filling into the second chamber 224, ensuring that the gas in the second chamber 224 can be filled to the set pressure value. In addition, since the pressure-stabilizing loading device 23 is connected to the pressure-stabilizing tube 22 through a pipeline, the pressure-stabilizing loading device 23 can also support the pressure-stabilizing tube 22 through the pipeline, thereby improving the stability of the pressure-stabilizing tube at a high position.

[0030] In some embodiments, the air supply device 21 includes an air compressor 211 and an air tank 212 connected to the air compressor 211, and the air tank 212 is connected to the first chamber 223. The air compressor 211 first compresses the air and fills it into the air tank 212, stores it in the air tank 212, opens the valve on the pipeline between the air tank 212 and the pressure stabilizing cylinder 22, and then the air tank 212 sends the air into the pressure stabilizing cylinder 22, so that the gas introduced into the system by the air compressor 211 can be concentrated and buffered in the air tank 212, which not only ensures that the air can be effectively transported and supplied to the fluid loading tank 1 in large quantities, and ensures that the air pressure in the fluid loading tank 1 is maintained at a set pressure value during the fluid loading period, but also, compared with the air compressor 211 directly passing the compressed air into the pressure stabilizing cylinder 22, the pulse pressure generated by the air transport of the air tank 212 is smaller, so as to avoid that the excessive pulse pressure cannot be completely eliminated by the elastic diaphragm 222, and ensure the stability of the air pressure entering the fluid loading tank 1.

[0031] In some embodiments, the ports at both ends of the elastic diaphragm 222 are fixedly mounted on the end plates 225 at both ends of the cylinder 221, and both end plates 225 are provided with vents 226 coaxially arranged with the elastic diaphragm 222. One vent 226 is connected to the air supply device 21 through the air inlet pipe 24, and the other vent 226 is connected to the fluid loading tank 1 through the air supply pipe 25. Both the air inlet pipe 24 and the air supply pipe 25 are coaxially arranged with the elastic diaphragm 222.

[0032] During the process of fluid loading tank 1, the flow path remains straight, and air can be smoothly filled into fluid loading tank 1, and the air will not increase the flow resistance due to the tortuous path during the flow of fluid, thereby avoiding the increase of local air pressure and causing the elastic diaphragm 222 in the pressure stabilizing cylinder 22 to expand, ensuring that the expansion of the elastic diaphragm 222 is caused by the pulse pressure, that is, ensuring that the deformation of the elastic diaphragm 222 can fully act on the effective buffering of the pulse pressure, thereby ensuring that the pulse pressure can be fully released after the air flows through the pressure stabilizing cylinder 22, and ensuring the stability of the air pressure in the fluid loading tank 1.

[0033] In some embodiments, there is an oil film 12 on the surface of the experimental water 11 in the fluid loading tank 1, and the oil film 12 separates the experimental water 11 from the air. Since high-pressure gas increases the solubility of air in water, more air is dissolved in the experimental water 11, which affects the observation of the supercavitation phenomenon in the experimental section of the water tunnel device 3 during the fluid experiment, the oil film 12 is generally set to a thickness of 2 to 3 cm. The oil film 12 prevents the air in the space above the fluid loading tank 1 from dissolving in the experimental water 11 below, ensuring that the supercavitation phenomenon will not be affected by other external factors.

[0034] In some embodiments, a rectifying grid 13 is installed in the fluid loading tank 1. The rectifying grid 13 is located in the experimental water 11 and above the output port 14 provided in the fluid loading tank 1. The output port 14 is connected to the water tunnel device 3. Most of the experimental water 11 in the fluid loading tank 1 is loaded into the water tunnel device 3 after flowing through the rectifying grid 13. The rectifying grid 13 located at the bottom of the fluid loading tank 1 can eliminate the turbulence and vortex caused by the high-speed jet, making the state of the experimental water 11 in the fluid loading tank 1 more stable, so that the experimental water 11 is sent to the water tunnel device 3 in a more stable state, and the quality of the flow field in the water tunnel device 3 is improved. In addition, when there is an oil film 12 in the fluid loading tank 1, it can also avoid the turbulence and vortex generated to cause the oil film 12 to mix with the experimental water 11, ensure that the oil film 12 stably covers the liquid surface, so that it continues to block the experimental water 11 from the high-pressure air, prevent more air from dissolving in the experimental water 11, and ensure that the supercavitation phenomenon is not affected by other factors.

[0035] In some embodiments, the pressure-stabilizing loading system further includes a water storage tank 4 and a return water pump 5. The water tunnel device 3 and the fluid loading tank 1 are connected to the water storage tank 4 through two pipelines respectively. The return water pump 5 is installed on the pipeline between the water storage tank 4 and the fluid loading tank 1, and is used to pump the water sent into the water storage tank 4 by the water tunnel device 3 back to the fluid loading tank 1.

[0036] After the experimental water 11 passes through the water tunnel device 3 for fluid experiment, it enters the water storage tank 4 for storage. After the experiment is completed, the valves at both ends of the water tunnel device 3 are closed, the valve installed on the pipeline between the fluid loading tank 1 and the water storage tank 4 is opened, and the return pump 5 is started to send the experimental water 11 in the water storage tank 4 back to the fluid loading tank 1, so as to realize the recycling of the experimental water 11, ensure that the experimental water 11 always remains in a stable state, ensure that the air content in the experimental water 11 in the system remains stable, and ensure the accurate observation of the supercavitation phenomenon in the fluid experiment.

[0037] In some embodiments, the pressure stabilizing cylinder 22 is connected to the top of the fluid loading tank 1, and the water tunnel device 3 is connected to the bottom of the fluid loading tank 1. The pressure stabilizing cylinder 22 is connected at the top to prevent air from being directly charged into the experimental water 11, causing the air to dissolve in the experimental water 11, thereby affecting the observation of the supercavitation phenomenon. The water tunnel device 3 is connected at the bottom to maximize the delivery of the experimental water 11 into the water tunnel device 3, ensuring that the fluid experiment can last longer at a high flow rate, so as to observe the experiment more fully.

[0038] In some embodiments, the pressure stabilizing loading system further includes an industrial computer 6. A charging valve 26 is installed on the pipeline between the gas supply device 21 and the pressure stabilizing cylinder 22, a pressure stabilizing valve 27 is installed on the pipeline between the pressure stabilizing loading device 23 and the pressure stabilizing cylinder 22, a loading pressure gauge 15 is installed on the fluid loading tank 1, a pressure stabilizing pressure gauge 28 for measuring the air pressure of the second chamber 224 is installed on the pressure stabilizing cylinder 22, and a loading valve 17 is installed on the pipeline between the fluid loading tank 1 and the water tunnel device 3.

[0039] The industrial computer 6 is electrically connected to the air supply device 21, the inflation valve 26 and the loading pressure gauge 15. The industrial computer 6 measures the loading air pressure in the fluid loading tank 1 through the loading pressure gauge 15. When the loading air pressure is lower than the set pressure value, the industrial computer 6 opens the inflation valve 26 and controls the air supply device 21 to inflate the fluid loading tank 1 until the loading air pressure reaches the set pressure value and the inflation valve 26 is closed. Therefore, before the experimental water 11 is loaded into the water tunnel device 3, the air pressure in the fluid loading tank 1 is increased to the set pressure value, so that the experimental water 11 can be loaded into the water tunnel device 3 with high-pressure gas that reaches the set pressure value.

[0040] The industrial computer 6 is electrically connected to the loading valve 17. The industrial computer 6 opens the pressure-stabilizing valve 27 and controls the pressure-stabilizing loading device 23 to inflate the second chamber 224 until the pressure value measured by the pressure-stabilizing barometer 28 reaches the set pressure value, and then closes the pressure-stabilizing valve 27, so that before the experimental water 11 is loaded, the first chamber 223 and the second chamber 224 inside and outside the pressure-stabilizing cylinder 22 are adjusted to the same pressure value. When the pressure-stabilizing loading device 23 is a storage tank, the industrial computer 6 only needs to control the opening and closing of the loading valve 17 according to the measured pressure value. If an air pump is installed on the pipeline between the pressure-stabilizing loading device 23 and the pressure-stabilizing cylinder 22, the industrial computer 6 starts the air pump when the loading valve 17 is opened, and closes the loading valve 17 when the pressure value reaches the set pressure value, and stops the operation of the air pump at the same time.

[0041] After the air pressure value of the loading pressure gauge and the air pressure value of the stabilizing pressure gauge reach the set pressure value, the loading valve 17 is opened to allow the high-pressure gas at the set pressure value to press the experimental water 11 out of the fluid loading tank 1 and load it into the water tunnel device 3.

[0042] In some embodiments, when the industrial computer 6 opens the loading valve 17, it controls the opening and closing of the inflation valve and the operation of the air supply device, that is, after opening the loading valve 17, the industrial computer 6 controls the opening of the inflation valve 26 and the operation of the air supply device 21, so that the air supply device 21 replenishes air to the fluid loading tank 1 through the pressure stabilizing cylinder 22, so that the air pressure in the fluid loading tank 1 is maintained at the set pressure value. More specifically, when the air pressure in the fluid loading tank 1 drops, the inflation valve 26 is opened and the air supply device 21 starts to operate; once the air pressure in the fluid loading pipe rises back to the set pressure value, the inflation valve 26 is closed and the operation of the air supply device 21 is stopped, thereby dynamically maintaining the air pressure in the fluid loading tank 1.

[0043] In some embodiments, a loading level meter 16 is installed on the fluid loading tank 1, and the industrial computer 6 is electrically connected to the loading level meter 16 to collect the liquid level of the experimental water 11 in the fluid loading tank 1. When the liquid level drops to the minimum liquid level threshold, the industrial computer 6 closes the loading valve 17 and stops loading the experimental water 11 into the water tunnel device 3 to prevent air or oil film 12 from flowing into the water tunnel device 3 and causing damage or contamination thereof.

[0044] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0045] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A pressure-stabilizing loading system for a cavitation water tunnel experimental device, characterized in that: include: A fluid loading tank, which contains experimental water and is connected to the water tunnel device; The air pressure loading unit is connected to the fluid loading tank and is used to fill air into the fluid loading tank, so that the experimental water therein is loaded into the water tunnel device under the pressure of the high-pressure air; The pneumatic loading unit includes: Gas supply device; A pressure stabilizing cylinder, comprising a cylinder body and an elastic diaphragm installed in the cylinder body, wherein the elastic diaphragm is tubular and divides the space inside the cylinder body into a first chamber and a second chamber, wherein the first chamber is located inside the elastic diaphragm, and the second chamber is located outside the elastic diaphragm and is arranged around the first chamber, and the air delivered by the air supply device is delivered into the fluid loading tank through the first chamber; A pressure-stabilizing loading device is connected to the pressure-stabilizing cylinder and delivers gas to the second chamber to make the gas pressure in the first chamber the same as the gas pressure in the second chamber.

2. The pressure-stabilizing loading system for the cavitation water tunnel experimental device according to claim 1 is characterized in that: The density of the gas filled into the second chamber by the pressure-stabilizing loading device is less than that of air.

3. The pressure-stabilizing loading system for the cavitation water tunnel experimental device according to claim 1 is characterized in that: The air supply device comprises an air compressor and an air storage tank connected to the air compressor, and the air storage tank is connected to the first chamber.

4. The pressure-stabilizing loading system for the cavitation water tunnel experimental device according to claim 1 is characterized in that: The ports at both ends of the elastic diaphragm are fixedly mounted on the end plates at both ends of the cylinder, and both end plates are provided with vents coaxially arranged with the elastic diaphragm; One of the air vents is connected to the air supply device through an air inlet pipe, and the other air vent is connected to the fluid loading tank through an air supply pipe. Both the air inlet pipe and the air supply pipe are coaxially arranged with the elastic diaphragm.

5. The pressure-stabilizing loading system for the cavitation water tunnel experimental device according to claim 1 is characterized in that: An oil film is provided on the water surface of the experimental water in the fluid loading tank to separate the experimental water from air.

6. The pressure-stabilizing loading system for the cavitation water tunnel experimental device according to claim 1 is characterized in that: The fluid loading tank is provided with a rectifying grid, which is located in the experimental water and above the output port provided in the fluid loading tank, and the output port is connected to the water tunnel device.

7. The pressure-stabilizing loading system for the cavitation water tunnel experimental device according to claim 1 is characterized in that: It further comprises a water storage tank and a water return pump, wherein the water tunnel device and the fluid loading tank are both connected to the water storage tank, and the water return pump pumps the water sent into the water storage tank by the water tunnel device back to the fluid loading tank.

8. The pressure-stabilizing loading system for the cavitation water tunnel experimental device according to claim 1 is characterized in that: It further comprises an industrial computer, an air charging valve is installed on the pipeline between the air supply device and the pressure stabilizing cylinder, a pressure stabilizing valve is installed on the pipeline between the pressure stabilizing loading device and the pressure stabilizing cylinder, a loading pressure gauge is installed on the fluid loading tank, a pressure stabilizing pressure gauge for measuring the air pressure of the second chamber is installed on the pressure stabilizing cylinder, and a loading valve is installed on the pipeline between the fluid loading tank and the water tunnel device; The industrial computer is electrically connected to the air supply device, the inflation valve and the loading pressure gauge. The industrial computer measures the loading air pressure in the fluid loading tank through the loading pressure gauge. When the loading air pressure is lower than a set pressure value, the industrial computer opens the inflation valve and controls the air supply device to inflate the fluid loading tank until the loading air pressure reaches the set pressure value and the inflation valve is closed. The industrial computer is electrically connected to the loading valve, and the industrial computer opens the pressure-stabilizing valve and controls the pressure-stabilizing loading device to inflate the second chamber until the pressure value measured by the pressure-stabilizing barometer reaches a set pressure value, and then closes the pressure-stabilizing valve; The industrial computer is electrically connected to the loading valve. After the air pressure values ​​of the loading pressure gauge and the pressure stabilizing pressure gauge both reach set pressure values, the industrial computer opens the loading valve.

9. The pressure-stabilizing loading system for the cavitation water tunnel experimental device according to claim 8, characterized in that: When the industrial computer opens the loading valve, it controls the opening and closing of the inflation valve and the operation of the air supply device, and replenishes air to the fluid loading tank so that the loading air pressure is maintained at a set pressure value.

10. The pressure-stabilizing loading system for the cavitation water tunnel experimental device according to claim 8, characterized in that: The fluid loading tank is equipped with a loading level gauge, the industrial computer is electrically connected to the loading level gauge, and when the loading level gauge measures that the liquid level of the experimental water drops to a minimum liquid level threshold, the industrial computer closes the loading valve.

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