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 experimental device comprises a fluid loading tank and an air pressure loading unit, the air pressure loading unit comprises an air supply device and a pressure stabilizing cylinder, the pressure stabilizing cylinder is provided with a cylinder body and an elastic diaphragm arranged in the cylinder body, the elastic diaphragm divides the internal space of the pressure stabilizing cylinder into a first chamber and a second chamber, and the first chamber and the second chamber are communicated with each other. And air conveyed by the air supply device is fed into the fluid loading tank through the first chamber. According to the embodiment of the utility model, the experimental water is loaded to the water tunnel device at a high speed through the loading of the high-pressure gas and the air pressure, so that the cavitation experiment is carried out in the water tunnel device, the vibration and noise of the loaded gas are relatively small, and the pulse pressure of the filled air can be eliminated by the elastic diaphragm in the pressure stabilizing cylinder; the pressure of gas in the fluid loading tank is kept stable, experimental water is stably pressed to the water tunnel device, the experimental water cannot be disturbed or generate turbulent flow, and pulsating pressure cannot be generated.

Description

Technical Field

[0001] This utility model 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 Technology

[0002] A cavitation tunnel is a key instrument used in fluid dynamics research and to observe cavitation phenomena. Its main applications include three aspects: first, research on ship propulsion performance, simulating different propeller operating conditions to observe the generation, development, and collapse of cavitation bubbles, thus helping to optimize propeller design, reduce cavitation erosion, and improve propulsion efficiency; second, serving hydrodynamic research, simulating water flow conditions under different speeds and attitudes of underwater vehicles to study the characteristics of objects flowing around water; and third, benefiting underwater weapon performance research, simulating torpedo navigation to explore the impact of cavitation on its stability and find ways to improve it, as well as studying how to reduce noise generated by cavitation and enhance weapon stealth.

[0003] With the development of underwater hypersonic weapons and the needs of hypersonic fluid dynamics research, cavitation water tunnels are evolving towards higher flow velocities, lower noise, and more precise flow field control. Currently, most cavitation water tunnel devices, both domestically and internationally, accelerate the fluid using water pumps. This loading method has the following drawbacks: 1. The water pump motor unit generates severe vibrations during startup and operation, which are transmitted through the pipe wall to the experimental section, affecting structural stability; 2. The water pump unit generates significant noise during operation, affecting noise measurement; 3. The fluid experiences disturbances and turbulence as it passes through the water pump, greatly reducing the quality of the flow field; 4. Water pump loading generates pulsating pressure due to the impeller, affecting the pressure stability of the experimental section. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a pressure-stabilized loading system for a cavitation water tunnel experimental device, which solves the problem of poor experimental results caused by vibration, noise, turbulence, and pulse pressure generated by current water pump loading.

[0005] This utility model provides a voltage-stabilized loading system for a cavitation water tunnel experimental apparatus, comprising:

[0006] A fluid loading vessel, which contains experimental water and is connected to a water tunnel device;

[0007] The pneumatic loading unit is connected to the fluid loading tank and is used to fill the fluid loading tank with air and load the experimental water inside into the water tunnel device under the pressure of the high-pressure air.

[0008] The pneumatic loading unit includes:

[0009] Gas supply device;

[0010] The pressure stabilizing cylinder has a cylinder body and an elastic diaphragm installed inside the cylinder body. The elastic diaphragm divides the internal space of the pressure stabilizing cylinder into a first chamber and a second chamber. Air supplied by the air supply device is sent into the fluid loading tank through the first chamber.

[0011] In some embodiments, the elastic diaphragm is tubular, with a first chamber located inside the elastic diaphragm and a second chamber located outside the elastic diaphragm and surrounding the first chamber.

[0012] In some embodiments, the 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 aligned with the first chamber.

[0013] In some embodiments, the pneumatic loading unit further includes a pressure-stabilizing loading device that supplies gas to the second chamber to make the gas pressure in the first chamber the same as the gas pressure in the second chamber.

[0014] In some embodiments, the gas density in the second chamber filled by the voltage-stabilizing loading device is less than that of air.

[0015] In some embodiments, the air supply device includes an air compressor and an air storage tank connected to the air compressor, the air storage tank being connected to a first chamber.

[0016] In some embodiments, an oil film is present on the surface of the experimental water in the fluid loading tank to isolate the experimental water from the air.

[0017] In some embodiments, a flow-rectifying grid is installed in the fluid loading chamber, which is located in the experimental water and above the output port of the fluid loading chamber, which is connected to a water tunnel device.

[0018] In some embodiments, a water storage tank and a return pump are further included. The water tunnel device and the fluid loading tank are both connected to the water storage tank, and the return pump pumps the water pumped from the water tunnel device into the water storage tank back to the fluid loading tank.

[0019] In some embodiments, the pressure stabilizing cylinder is connected to the top of the fluid loading tank, and the water tunnel device is connected to the bottom of the fluid loading tank.

[0020] Compared with the prior art, the beneficial effects of this application are as follows: In the embodiments of this utility model, high-pressure gas is used to load experimental water at high speed into the water tunnel device, thereby conducting cavitation experiments in the water tunnel device. The vibration and noise of the loaded gas are relatively small, and the elastic diaphragm in the pressure stabilizing cylinder can eliminate the pulse pressure of the injected air, so that the gas pressure in the fluid loading tank remains stable, and the experimental water is stably pressed into the water tunnel device. The experimental water will not be disturbed or generate turbulence, nor will it generate pulsating pressure. This solves the problem that the vibration, noise, turbulence and pulse pressure generated by the current water pump loading cause poor experimental results. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the voltage-stabilized loading system of the present invention used in a cavitation water tunnel experimental device;

[0023] Figure 2 This is a schematic diagram of the pressure-stabilizing cylinder in the pressure-stabilizing loading system of the cavitation water tunnel experimental device of this utility model;

[0024] In the picture:

[0025] 1. Fluid loading tank; 11. Experimental water; 12. Oil film; 13. Rectifying grid; 14. Outlet;

[0026] 2. Pneumatic loading unit; 21. Air supply device; 211. Air compressor; 212. Air storage tank; 22. Pressure stabilizing cylinder; 221. Cylinder body; 222. Elastic diaphragm; 223. First chamber; 224. Second chamber; 225. End plate; 226. Vent; 23. Pressure stabilizing loading device;

[0027] 3. Water tunnel device; 4. Water storage tank; 5. Return water pump. Detailed Implementation

[0028] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] like Figures 1 to 2 As shown, in one illustrative embodiment of the pressure-stabilizing loading system for the cavitation water tunnel experimental device of this utility model, the pressure-stabilizing loading system for the cavitation water tunnel experimental device includes a fluid loading tank 1 and a pneumatic loading unit 2.

[0033] The fluid loading tank 1 contains experimental water 11 and is connected to the water tunnel device 3. The pneumatic loading unit 2 is connected to the fluid loading tank 1. The pneumatic loading unit 2 includes a gas supply device 21 and a pressure stabilizing cylinder 22. The pressure stabilizing cylinder 22 has a cylinder body 221 and an elastic diaphragm 222 installed inside the cylinder body 221. The elastic diaphragm 222 divides the internal space of the pressure stabilizing cylinder 22 into a first chamber 223 and a second chamber 224.

[0034] The gas supply device 21 is connected to the pressure stabilizing cylinder 22, which is connected to the fluid loading tank 1. The gas supply device 21 delivers gas to the first chamber 223 inside 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. Under the action of the high-pressure air, the experimental water 11 in the fluid loading tank 1 is forced out, so that it is forced 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 observe the fluid state of the fluid passing through the model, thereby studying the fluid dynamic characteristics of different models.

[0035] Compared to pumping experimental water 11 into the water tunnel device 3 using a water pump for fluid experiments, using high-pressure gas to force the experimental water 11 into the water tunnel device 3 eliminates the vibration and noise generated by the water pump operation. This avoids the vibration being transmitted to the experimental section of the water tunnel device 3, which could affect the structural stability, and also avoids the water pump noise being transmitted to the water tunnel device 3, which could affect the measurement of fluid noise. Furthermore, the experimental water 11 forced into the water tunnel device 3 is not agitated by the impeller, avoiding disturbances and turbulence in the experimental water 11, as well as the generation of pulse pressure in the experimental water 11. This ensures the smooth flow quality in the water tunnel device 3, guarantees the stability of the pressure in the experimental section of the water tunnel device 3, and ensures the accuracy of the fluid experiment results.

[0036] In addition, the air supply device 21 inflates the fluid loading tank 1 through the pressure stabilizing cylinder 22, thereby forcing the experimental water 11 in the fluid loading tank 1 into the water tunnel device 3 with high-pressure air. The air supply device 21 is far from the water tunnel device 3, and the vibration and noise generated by its operation are unlikely to be transmitted to the water tunnel device 3, thus not affecting the fluid experiment conducted in the water tunnel device 3. When the air supply device 21 inflates, it generates pulse pressure in the air. During the process of inflating the fluid loading tank 1, the air passes through the pressure stabilizing cylinder 22. The elastic diaphragm 222 in the pressure stabilizing cylinder 22 buffers the passing air, transmitting the pulse pressure in the air to the second chamber 224, thereby eliminating the pulse pressure and ensuring that the gas pressure reaching the fluid loading tank 1 is within a stable range, meeting the requirements for stable loading energy. This allows the experimental water 11 to be 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 decreases, the air supply device 21 continuously replenishes the fluid loading tank 1 with air, ensuring the stability of the internal air pressure and thus continuously and stably outputting water.

[0037] In the above illustrative embodiment, the pressure-stabilizing loading system for the cavitation water tunnel experimental device uses high-pressure gas to load the experimental water 11 at high speed into the water tunnel device 3, thereby conducting cavitation experiments in the water tunnel device 3. The vibration and noise of the loading gas are relatively small, and the elastic diaphragm 222 in the pressure-stabilizing cylinder 22 can eliminate the pulse pressure of the injected air, keeping the gas pressure in the fluid loading tank 1 stable and stably pressing the experimental water 11 into the water tunnel device 3. The experimental water 11 will not be disturbed or generate turbulence, nor will it generate pulsating pressure, thus solving the problem of poor experimental results caused by vibration, noise, turbulence and pulse pressure generated by the current water pump loading.

[0038] In some embodiments, the elastic diaphragm 222 is tubular, with a first chamber 223 located inside the elastic diaphragm 222 and a second chamber 224 located outside the elastic diaphragm 222 and surrounding the first chamber 223.

[0039] During the process of air being fed into the fluid loading tank 1 through the pressure stabilizing cylinder 22, the air passes through the tubular elastic diaphragm 222. The elastic diaphragm 222 forms a comprehensive covering of the flowing air, thus buffering the air from multiple angles and efficiently transmitting the pulse pressure outward to the annular second chamber 224. This ensures that the pulse pressure is completely eliminated when the air flows out of the pressure stabilizing cylinder 22, ensuring that the gas pressure reaching the fluid loading tank 1 remains within a stable range, meeting the requirements for stable loading energy. In addition, it 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 deformation or even vibration under pressure, ensuring the stability of the pressure stabilizing cylinder 22, and preventing vibration caused by air pressure from affecting the fluid experiment.

[0040] In some embodiments, the ports at both ends of the elastic diaphragm 222 are fixedly installed on the end plates 225 at both ends of the cylinder 221. Both end plates 225 are provided with vents 226 that are aligned with the first chamber 223. The two vents 226 are respectively connected to the air supply device 21 and the fluid loading tank 1.

[0041] The elastic diaphragm 222 is arranged along the axial direction of the cylinder 221 to maximize its length within the limited space inside the cylinder 221, thereby maximizing the surface area of ​​the elastic diaphragm 222 and ensuring its efficient buffering and outward transmission of pulse vibrations.

[0042] In some embodiments, the pneumatic loading unit 2 further includes a pressure stabilizing loading device 23 connected to the pressure stabilizing cylinder 22, thereby delivering gas to the second chamber 224 so that the gas pressure in the first chamber 223 is the same as the gas pressure in the second chamber 224.

[0043] The pressure stabilizing loading device 23 is a storage tank containing high-pressure gas. By controlling the valve installed on the pipeline connected to the pressure stabilizing cylinder 22, 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 second chamber 224 with gas from the pressure stabilizing loading device 23. When the gas pressure in the second chamber 224 is the same as the set pressure value, the valve is closed to stop filling the second chamber 224 with gas, so that the gas pressure in the second chamber 224 is maintained at the set pressure value. The air supply device 21 pressurizes the fluid loading tank 1, maintaining the air pressure within it at a set pressure value. The air pressure in the first chamber 223, connected to the fluid loading tank 1, is also at the set pressure value. This ensures that the air pressure in the first chamber 223 is the same as that in the second chamber 224, preventing the elastic diaphragm 222 from being constantly deformed to one side due to a pressure difference between the two chambers. This keeps the elastic diaphragm 222 constantly tense, making it difficult for it to expand or contract under pulse pressure. This ensures that when pulse pressure occurs or the pressure is unstable, the elastic diaphragm 222 expands or contracts with the pressure change, maintaining stable pressure inside the first chamber 223 and effectively eliminating pulse pressure. To ensure gas is supplied to 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, allowing air from the pressure stabilizing loading device 23 to be pumped into the second chamber 224.

[0044] In some embodiments, the gas density in the second chamber 224 filled by the pressure stabilizing loading device 23 is less than that of air, thereby ensuring that when the elastic diaphragm 222 expands or contracts, the spatial change of the second chamber 224 will not cause the gas density in the second chamber 224 to be higher than the air density in the first chamber 223. This avoids the elastic diaphragm 222 from being unable to deform in the second chamber 224 with the pulse pressure due to the gas density in the second chamber 224 being higher than the air density in the first chamber 223. This ensures that when pulse pressure or pressure instability occurs, the elastic diaphragm 222 will expand or contract with the pressure change, maintaining the internal pressure of the first chamber 223 stable and effectively eliminating the pulse pressure.

[0045] In some embodiments, the air supply device 21 includes an air compressor 211 and an air storage tank 212 connected to the air compressor 211. The air storage tank 212 is connected to the first chamber 223. The air compressor 211 first compresses air and fills the air storage tank 212, and then the air storage tank 212 sends the air into the pressure stabilizing cylinder 22, so that the gas can be buffered in the air storage tank 212. Compared with the air compressor 211 directly sending the compressed air into the pressure stabilizing cylinder 22, the pulse pressure generated by the air supply in the air storage tank 212 is smaller. Excessive pulse pressure cannot be completely eliminated by the elastic diaphragm 222, ensuring that the air pressure in the fluid loading tank 1 is stable.

[0046] In some embodiments, an oil film 12 is present on the surface of the experimental water 11 in the fluid loading tank 1, separating the experimental water 11 from the air. Since high-pressure gas increases the solubility of air in water, causing more air to dissolve into the experimental water 11 and affecting the observation of supercavitation in the experimental section of the water tunnel device 3 during fluid experiments, the oil film 12 prevents air in the space above the fluid loading tank 1 from dissolving into the experimental water 11 below, ensuring that the supercavitation phenomenon is not affected by other external factors.

[0047] In some embodiments, a flow-rectifying grid 13 is installed in the fluid loading tank 1. The flow-rectifying grid 13 is located in the experimental water 11 and above the output port 14 of the fluid loading tank 1, which is connected to the water tunnel device 3. The flow-rectifying grid 13 located at the bottom of the fluid loading tank 1 can eliminate turbulence and vortices caused by high-speed jets, making the state of the experimental water 11 in the fluid loading tank 1 more stable, and allowing the experimental water 11 to be delivered into the water tunnel device 3 in a more stable state, thereby improving the quality of the flow field in the water tunnel device 3. In addition, when there is an oil film 12 in the fluid loading tank 1, it can also prevent the generated turbulence and vortices from mixing the oil film 12 with the experimental water 11, ensuring that the oil film 12 stably covers the liquid surface, continuously blocking the experimental water 11 from high-pressure air, preventing more air from dissolving in the experimental water 11, and ensuring that the supercavitation phenomenon is not affected by other factors.

[0048] In some embodiments, the 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 both connected to the water storage tank 4, and the return water pump 5 pumps the water sent from the water tunnel device 3 into the water storage tank 4 back to the fluid loading tank 1.

[0049] After the experimental water 11 is used for fluid experiments through the water tunnel device 3, 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 between the fluid loading tank 1 and the water storage tank 4 is opened, and the return water 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 and ensure that the experimental water 11 always remains in a stable state.

[0050] 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 top connection of the pressure stabilizing cylinder 22 prevents air from directly entering the experimental water 11, causing air to dissolve in the experimental water 11 and affecting the observation of supercavitation. The bottom connection of the water tunnel device 3 allows for maximum flow of experimental water 11 into the water tunnel device 3, ensuring that the fluid experiment can continue at high flow rates for a longer period, allowing for more comprehensive observation of the experiment.

[0051] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0052] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A voltage-stabilized loading system for a cavitation water tunnel experimental apparatus, characterized in that, include: A fluid loading vessel, which contains experimental water and is connected to a water tunnel device; A pneumatic loading unit, connected to the fluid loading tank, is used to fill the fluid loading tank with air and load the experimental water therein into the water tunnel device under the pressure of high-pressure air. The pneumatic loading unit includes: Gas supply device; A pressure stabilizing cylinder has a cylinder body and an elastic diaphragm installed inside the cylinder body. The elastic diaphragm divides the internal space of the pressure stabilizing cylinder into a first chamber and a second chamber. Air supplied by the air supply device is sent into the fluid loading tank through the first chamber.

2. The voltage-stabilized loading system for the cavitation water tunnel experimental apparatus according to claim 1, characterized in that, The elastic diaphragm is tubular, with the first chamber located inside the elastic diaphragm and the second chamber located outside the elastic diaphragm, surrounding the first chamber.

3. The voltage-stabilized loading system for the cavitation water tunnel experimental apparatus according to claim 2, characterized in that, The ports at both ends of the elastic diaphragm are fixedly installed on the end plates at both ends of the cylinder, and each of the two end plates is provided with a vent that is aligned with the first chamber.

4. The voltage-stabilized loading system for the cavitation water tunnel experimental apparatus according to claim 1, characterized in that, The pneumatic loading unit further includes a pressure stabilizing loading device, which supplies gas to the second chamber to make the gas pressure in the first chamber the same as the gas pressure in the second chamber.

5. The voltage-stabilized loading system for the cavitation water tunnel experimental apparatus according to claim 4, characterized in that, The gas density in the second chamber filled by the voltage-stabilizing loading device is less than that of air.

6. The voltage-stabilized loading system for the cavitation water tunnel experimental apparatus according to claim 1, characterized in that, The air supply device includes an air compressor and an air storage tank connected to the air compressor, the air storage tank being connected to the first chamber.

7. The voltage-stabilized loading system for the cavitation water tunnel experimental apparatus according to claim 1, characterized in that, An oil film is present on the surface of the experimental water in the fluid loading tank to isolate the experimental water from the air.

8. The voltage-stabilized loading system for the cavitation water tunnel experimental apparatus according to claim 1, characterized in that, The fluid loading tank is equipped with a flow rectifier grid, which is located in the experimental water and above the output port of the fluid loading tank. The output port is connected to the water tunnel device.

9. The voltage-stabilized loading system for the cavitation water tunnel experimental apparatus according to claim 1, characterized in that, It further includes a water storage tank and a return water pump. The water tunnel device and the fluid loading tank are both connected to the water storage tank. The return water pump pumps the water sent by the water tunnel device into the water storage tank back to the fluid loading tank.

10. The voltage-stabilized loading system for the cavitation water tunnel experimental apparatus according to claim 1, characterized in that, The pressure stabilizing cylinder is connected to the top of the fluid loading tank, and the water tunnel device is connected to the bottom of the fluid loading tank.

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