A circulating water tunnel with low noise environment

Abstract

The present invention relates to the technical field of fluid dynamics experimental equipment, and in particular to a circulating water tunnel in a low-noise environment, comprising: a water source power mechanism, including a high-level water tank and a water flow regulating module, the high-level water tank is used to carry water, and the water flow regulating module is used to provide power for the flow of water in the high-level water tank through air pressure driving; a rectification test mechanism, used to adjust the water flow and conduct a water flow test; a water source recovery mechanism, used to collect the water source discharged by the rectification test mechanism, and to transport the discharged water source to the high-level water tank of the water source power mechanism to maintain the water balance of the circulating water tunnel; a noise reduction mechanism, including a muffler, an iron sand frame and a flexible rubber plate; a data acquisition mechanism is used to obtain the water level of the high-level water tank, the water flow velocity of the test section and the noise intensity generated by the water flow regulating module during the air pressure driving process. The present invention can effectively reduce noise.

Description

Technical Field

[0001] The invention relates to the technical field of fluid dynamics experimental equipment, and in particular to a circulating water tunnel in a low-noise environment. Background Art

[0002] In the field of scientific research and engineering applications, in-depth understanding and simulation testing of fluid dynamics are crucial. Especially in the field of low noise environment requirements, such as acoustic testing, underwater equipment performance evaluation, marine biological behavior research, etc., it is particularly important to build a circulating water tunnel system that can accurately simulate and maintain low noise levels.

[0003] Traditional circulating water tunnel design mainly focuses on the regulation of basic physical parameters such as water velocity, pressure, and temperature to simulate and analyze fluid dynamic characteristics. However, with the development of science and technology, especially the advancement of acoustic technology, the control requirements for fluid environment noise level are becoming increasingly stringent. In the fields of deep-sea exploration, underwater communications, underwater vehicle design, etc., low-noise environment has become a key factor affecting equipment performance evaluation and optimization.

[0004] Although the existing circulating water tunnel technology has made some progress, there are still many challenges in simulating and maintaining a low-noise environment. For example, the mechanical noise generated by the operation of the water pump, the turbulent noise when the water flows through the pipes and devices, and the interference noise of the external environment on the experimental cavity are all important factors affecting the low-noise performance of the circulating water tunnel. Therefore, the development of a low-noise environment circulating water tunnel system that can effectively reduce and control the noise level and meet the needs of fluid dynamics simulation is of great significance to improving the accuracy and reliability of scientific research and engineering tests in related fields. Summary of the invention

[0005] To this end, the present invention provides a circulating water tunnel in a low-noise environment to overcome the problem that the circulating water tunnel in the prior art cannot effectively reduce noise.

[0006] To achieve the above object, the present invention provides a circulating water tunnel in a low-noise environment, comprising:

[0007] A water source power mechanism, comprising a high-level water tank and a water flow regulating module, wherein the high-level water tank is used to carry water source, and the water flow regulating module is connected to the high-level water tank to provide power for the water flow in the high-level water tank through air pressure driving;

[0008] A rectification test mechanism, which is used to adjust the water flow and conduct a water flow test, wherein the rectification test mechanism comprises a rectification section, a contraction section and a test section, wherein the rectification section, the contraction section and the test section are sequentially connected end to end, one end of the rectification section is connected to the high-level water tank, and the other end is connected to the contraction section, and the test section is connected to a test device;

[0009] A water source recovery mechanism, which is respectively connected to the rectification test mechanism and the water source power mechanism, and is used to collect the water source discharged from the rectification test mechanism, and transport the discharged water source to the high-level water tank of the water source power mechanism to maintain the water balance of the circulating water tunnel;

[0010] A noise reduction mechanism, comprising a muffler, an iron sand frame and a flexible rubber sheet, wherein the muffler is connected to the water source power mechanism to absorb the noise generated by the water flow regulating module during air pressure driving, and the iron sand frames for absorbing the vibration of the cave body are respectively arranged on the cave walls at both ends of the test section, and the flexible rubber sheet is covered and connected to the inner wall of the water source power mechanism, the rectification test mechanism and the water source recovery mechanism to absorb the vibration and noise generated by the fluid during the flow process;

[0011] The data acquisition mechanism is respectively connected to the water source power mechanism and the rectification test mechanism to obtain the water level of the high-level water tank, the water flow velocity of the test section and the noise intensity generated by the water flow regulating module during the air pressure driving process.

[0012] Further, the water flow regulating module includes an air storage tank, a motorized water tank and a regulating unit;

[0013] Wherein, the gas storage tank is used to store and release gas, and the gas storage tank is provided with a plurality of air inlets, and the air inlets are arranged inside the motorized water tank, so as to release the gas in the gas storage tank into the motorized water tank; the motorized water tank is respectively connected to the air inlets and the high-level water tank, so as to store water, and push the water in the motorized water tank into the high-level water tank when the gas is released from the air inlets;

[0014] The control unit is respectively connected to the data acquisition mechanism, the gas storage tank and the air inlet, and is used to adjust the air pressure of the gas storage tank and the opening of the air inlet according to the water level of the high-level water tank.

[0015] Furthermore, the water source recovery mechanism comprises a diffusion section, a corner, a round and square floor, a rubber tube and a water pool, wherein the diffusion section, the corner, the round and square floor, the rubber tube and the water pool are sequentially connected end to end;

[0016] Wherein, one end of the diffusion section is connected to the water outlet of the test section to reduce the water flow velocity;

[0017] The corner is used to reduce the impact force of water flow on the elbow;

[0018] The rubber tube is used to change the water flow velocity by squeezing, wherein the inner wall cross-sectional area of ​​the rubber tube is smaller than the inner wall cross-sectional area of ​​the round sky and square earth;

[0019] The round top and square bottom are used to reduce the impact force on the corner when the rubber tube is squeezed;

[0020] The water pool is connected to the water source power mechanism, and is used to collect the water source discharged from the rectification test mechanism, and to transport the discharged water source to the motorized water tank through a circulation pump to maintain the water balance of the circulating water tunnel.

[0021] Furthermore, it also includes an extrusion mechanism; the extrusion mechanism includes an extrusion analysis module and an extrusion mechanical module, wherein:

[0022] The extrusion analysis module is connected to the data acquisition mechanism and is used to determine whether the rubber tube needs to be squeezed according to the water flow velocity of the test section;

[0023] The extrusion mechanical module is respectively connected to the extrusion analysis module and the outer wall of the rubber tube, and is used to adjust the extrusion force of the extrusion mechanical module according to the determination result of the extrusion analysis module.

[0024] Furthermore, the extrusion analysis module determines the extrusion force of the extrusion mechanical module according to the water flow velocity of the test section and the noise intensity.

[0025] Furthermore, the control unit compares the water level of the high-level water tank with a preset water level threshold, and adjusts the air pressure of the gas storage tank according to the comparison result, and adjusts the opening of the air inlet according to the water level of the high-level water tank and the air pressure of the gas storage tank.

[0026] Furthermore, a flow regulating valve is provided on the inner wall of the middle part of the rubber tube, and the water flow regulating module adjusts the water flow cross-sectional area in the rubber tube according to the change in noise intensity generated by the front and rear water flow regulating modules during air pressure driving according to the extrusion force adjustment.

[0027] Furthermore, the flexible rubber sheet is covered and connected to the inner wall of the contraction section, the rectification section, the high-level water tank, the motorized water tank, the round sky and square earth, the corner and the diffusion section.

[0028] Furthermore, the rectification test mechanism determines the length of the test section according to the ratio of the inlet cross-sectional area to the outlet cross-sectional area of ​​the contraction section.

[0029] Furthermore, damping nets are provided at the inlet and outlet of the contraction section.

[0030] Compared with the prior art, the beneficial effect of the present invention is that the water source power mechanism of the present invention replaces the water pump to drive the water source transmission through air pressure drive, which can reduce the noise generated by the drive. The rectification test mechanism can reduce the eddy current generated during the flow of the water source, reduce the turbulence of the test section, and improve the quality of the test flow field by setting the rectification section, the contraction section and the test section. The water source recovery mechanism maintains the water volume balance and stabilizes the water flow of the circulating water tunnel by collecting the water source. The noise reduction mechanism further reduces the noise generated during the air pressure drive by setting a muffler, and the iron sand frame can absorb the vibration energy generated by the cave body under the action of the fluid and suppress the generation of noise. The soft rubber plate can not only improve the sealing performance, but also effectively absorb the vibration generated by the fluid during the flow process and reduce the propagation of noise. The data acquisition mechanism can provide data support for data analysis by collecting the water level of the high-level water tank and the water flow velocity of the test section.

[0031] Furthermore, the water flow regulating module of the present invention utilizes the high-pressure gas stored in the gas storage tank to release it into the motorized water tank through the water inlet to push the water in the motorized water tank to the high-level water tank, and then provides the required flow rate for the test section by gravity overflow, which can effectively reduce noise; by setting a control unit, the air pressure in the gas storage tank and the opening of the air inlet are adjusted according to the water level in the high-level water tank, so as to accurately control the fluid transfer and improve the test accuracy.

[0032] Furthermore, the water source recovery mechanism of the present invention can reduce the resistance and noise of water flow, reduce the impact of water flow on the cave wall and the flow rate, and reduce energy loss by arranging a diffusion section, a corner, and a round top and a square bottom; arranging a rubber tube instead of a valve to control the opening of the flow channel can effectively absorb the impact of the fluid and reduce the generation of noise; and by arranging a water pool for water source collection, it can reduce the vibration of water returning to the circulation system, reduce noise, and improve the utilization rate of water resources.

[0033] Furthermore, the present invention provides an extrusion mechanism to extrude the rubber tube, thereby controlling the opening of the flow channel, which can reduce fluid disturbance and noise.

[0034] Furthermore, the present invention arranges damping nets at the inlet and outlet of the contraction section to reduce the turbulence of the water flow, so that the water flow entering the test section is more stable and uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a structural block diagram of a circulating water tunnel in a low noise environment according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of a circulating water tunnel in a low-noise environment according to an embodiment of the present invention;

[0037] Figure 3This is a logic judgment diagram of the extrusion analysis module of the embodiment of the present invention for determining whether the rubber tube needs to be extruded;

[0038] Figure 4 A logic judgment diagram of the control unit adjusting the gas pressure of the gas storage tank according to an embodiment of the present invention;

[0039] In the figure: 1. Test section; 2. Contraction section; 3. Rectification section; 4. High-level water tank; 5. Air inlet; 6. Muffler; 7. Motorized water tank; 8. Air storage tank; 9. Pool; 10. Rubber tube; 11. Round sky and square earth; 12. Corner; 13. Diffusion section; 14. Iron sand frame. DETAILED DESCRIPTION

[0040] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0042] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0043] In addition, it should be noted that in the description of the present invention, 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] See also Figure 1 and Figure 2 As shown, it is a structural block diagram of a circulating water tunnel in a low-noise environment according to an embodiment of the present invention; Figure 2 Schematic diagram of the structure of a circulating water tunnel in a low-noise environment according to an embodiment of the present invention; in the figure: a test section 1, a contraction section 2, a rectification section 3, a high-level water tank 4, an air inlet 5, a muffler 6, a motorized water tank 7, an air storage tank 8, a water pool 9, a rubber tube 10, a round sky and a square earth 11, a corner 12, a diffusion section 13, and an iron sand frame 14.

[0045] The embodiment of the present invention provides a circulating water tunnel in a low-noise environment, comprising:

[0046] The water source power mechanism comprises a high-level water tank 4 and a water flow regulating module. The high-level water tank 4 is used to provide a water source. The water flow regulating module is connected to the high-level water tank 4 to provide power for the water flow in the high-level water tank 4 through air pressure driving.

[0047] A rectification test mechanism, which is used to adjust the water flow and conduct a water flow test, wherein the rectification test mechanism comprises a rectification section 3, a contraction section 2 and a test section 1, wherein the rectification section 3, the contraction section 2 and the test section 1 are connected end to end in sequence, wherein one end of the rectification section 3 is connected to the high-level water tank 4, and the other end is connected to the contraction section 2, and the test section 1 is connected to a test device;

[0048] It is understandable that multiple layers of porous plates, rectifying grids, honeycombs and other structures can be set in the rectifying section to maintain uniform flow of water along the holes, destroy local large circulations that may be formed, and divide larger-scale vortices into small-scale vortices.

[0049] In practice, the test section 1 is connected to a test device for conducting fluid mechanics tests, etc. The test device can be placed inside the test section or connected to the wall of the test section, and can be set according to actual conditions.

[0050] The data acquisition mechanism is respectively connected to the water source power mechanism and the rectification test mechanism to obtain the water level of the high-level water tank 4, the water flow velocity of the test section 1, and the noise intensity generated by the water flow regulating module during the air pressure driving process.

[0051] It should be noted that those skilled in the art know that any device and method in the prior art that can collect the water level of the high-level water tank 4, the water flow velocity of the test section 1, and the noise intensity generated by the water flow regulating module during the air pressure drive process falls within the protection scope of the present invention and will not be repeated here.

[0052] Specifically, the water flow regulating module includes an air storage tank 8, a motorized water tank 7 and a control unit;

[0053] The gas storage tank 8 is used to store and release gas. The gas storage tank 8 is provided with a plurality of air inlets 5. The air inlets 5 are provided inside the motorized water tank 7 to release the gas in the gas storage tank 8 into the motorized water tank. The motorized water tank 7 is connected to the air inlets 5 and the high-level water tank 4, respectively, to store water, and to push the water in the motorized water tank 7 into the high-level water tank 4 when the air inlets 5 release gas.

[0054] In practice, before the experiment begins, an air compressor can be used to pump high-pressure gas into the gas tank 8 for storage. During the test, the gas in the gas tank 8 is subjected to noise reduction treatment through the muffler 6 and then pressed into the motorized water tank 7. As the gas is pressed in, the water in the motorized water tank 7 is compressed and pushed into the high-level water tank 4. During the experiment, the liquid level in the high-level water tank 4 can be ensured to remain constant by precisely controlling the opening of the air inlet 5, thereby ensuring a constant flow rate in the test section 1, thereby ensuring the accuracy and reliability of the experimental results.

[0055] The control unit is respectively connected to the data acquisition mechanism, the gas storage tank 8 and the air inlet 5, and is used to adjust the air pressure of the gas storage tank 8 and the opening of the air inlet 5 according to the water level of the high-level water tank 4.

[0056] Specifically, the control unit compares the water level of the high-level water tank 4 with a preset water level threshold, adjusts the air pressure of the gas storage tank 8 according to the comparison result, and adjusts the opening of the air inlet 5 according to the water level of the high-level water tank 4 and the air pressure of the gas storage tank 8.

[0057] During implementation, the water level of the high-level water tank 4 is compared with the preset water level threshold. If the water level of the high-level water tank 4 is greater than the preset water level threshold, the air pressure of the gas storage tank 8 is reduced. If the water level of the high-level water tank 4 is less than or equal to the preset water level threshold, the air pressure of the gas storage tank 8 is increased, and the reduction / increase amplitude of the air pressure of the gas storage tank 8 is determined according to the difference between the water level of the high-level water tank 4 and the preset water level threshold.

[0058] In implementation, the first coefficient is determined according to the ratio of the water level of the high-level water tank 4 to the preset water level threshold, and the second coefficient is determined according to the ratio of the air pressure of the gas storage tank 8 to the preset air pressure threshold. The opening coefficient is determined according to the product of the first coefficient and the second coefficient, and the opening of the air inlet 5 is determined according to the product of the opening coefficient and 90°. For example: the water level of the high-level water tank 4 is 30mm, and the preset water level threshold is 20mm, then the first coefficient is 30 / 20=1.5, the air pressure of the gas storage tank 8 is 50Pa, and the preset air pressure threshold is 100Pa, then the second coefficient is 50 / 100=0.5, then the opening coefficient is 1.5×0.5=0.75, and the opening of the air inlet 5 is 0.75×90=67.5°.

[0059] It can be understood that the actual implementers can determine the preset water level threshold according to the actual situation or the average water level of the high-level water tank 4 in the fluid experiment that has passed the qualification test based on historical data or the height of the high-level water tank 4. The actual implementers can determine the preset air pressure threshold according to the actual situation or the average air pressure of the air tank 8 in the fluid experiment that has passed the qualification test based on historical data. Preferably, the preset water level threshold is set to 3 / 5 to 7 / 10 of the height of the high-level water tank 4, and the preset air pressure threshold is set to 0.5MPa to 2MPa.

[0060] Specifically, the rectification test mechanism determines the length of the test section 1 according to the ratio of the inlet cross-sectional area to the outlet cross-sectional area of ​​the contraction section 2 .

[0061] In implementation, the length of the test section 1 is determined according to the product of the ratio of the inlet cross-sectional area to the outlet cross-sectional area of ​​the contraction section 2 and the standard length. The actual implementation personnel can set the standard length according to the actual situation or based on the average length of the test section 1 that has passed the qualification test in historical data. Preferably, the standard length is 500 mm to 700 mm.

[0062] Specifically, damping nets are arranged at the inlet and outlet of the contraction section 2 .

[0063] It can be understood that damping nets of different thicknesses are arranged before and after the contraction section to make the water flow evenly along the hole net, divide the large-scale vortex into small-scale vortices, eliminate the rotational motion in the water flow, reduce the lateral flow, make the water flow direction consistent with the axis of the test section, reduce the turbulence of the water flow, and improve the flow field quality. In actual implementation, the damping net can be made of organic glass plates. Preferably, the inlet damping net is 15 to 25 meshes, and the outlet damping net is finer than the inlet damping net, which can be set to 28 to 35 meshes. This is a prior art and will not be elaborated here.

[0064] The present invention arranges damping nets at the inlet and outlet of the contraction section 2 to reduce the turbulence of the water flow, so that the water flow entering the test section 1 is more stable and uniform.

[0065] It can be understood that the high-level water tank 4 is provided with a water inlet and a water outlet, the water inlet of the high-level water tank 4 is connected to the water outlet of the motorized water tank 7, the water outlet of the high-level water tank 4 is connected to the end of the rectifying section 3 away from the contraction section 2, and the height of the high-level water tank 4 is greater than the height of the water tank. Preferably, the height of the high-level water tank 4 is 2 to 3 times the height of the motorized water tank.

[0066] The water flow regulating module of the present invention utilizes the high-pressure gas stored in the air tank 8 to release it into the motorized water tank through the water inlet to push the water in the motorized water tank to the high-level water tank 4, and then provides the required flow rate for the test section 1 through gravity overflow, which can effectively reduce noise; by setting a control unit, the air pressure in the air tank 8 and the opening of the air inlet 5 are adjusted according to the water level in the high-level water tank 4, so as to accurately control the fluid transfer and improve the test accuracy.

[0067] A water source recovery mechanism, which is respectively connected to the rectification test mechanism and the water source power mechanism, and is used to collect the water source discharged from the rectification test mechanism, and transport the discharged water source to the high-level water tank of the water source power mechanism to maintain the water balance of the circulating water tunnel;

[0068] Specifically, the water source recovery mechanism includes a diffusion section 13, a corner 12, a round top and a square bottom 11, a rubber tube 10 and a pool 9, wherein the diffusion section 13, the corner 12, the round top and the square bottom 11, the rubber tube 10 and the pool 9 are sequentially connected end to end;

[0069] One end of the diffusion section 13 is connected to the corner 12, and the other end is connected to the water outlet of the test section 1, so as to reduce the water flow speed;

[0070] The corner 12 is used to reduce the impact force of water flow on the elbow;

[0071] The rubber tube 10 is used to change the water flow velocity by squeezing, wherein the inner wall cross-sectional area of ​​the rubber tube is smaller than the inner wall cross-sectional area of ​​the round-sky-square-square;

[0072] The round top and square bottom 11 is used to reduce the impact force on the corner 12 when the rubber tube 10 is squeezed;

[0073] The water pool 9 is connected to the water source power mechanism, and is used to collect the water source discharged from the rectification test mechanism, and to transport the discharged water source to the motorized water tank through a circulation pump to maintain the water balance of the circulating water tunnel.

[0074] It can be understood that one end of the diffusion section 13 is connected to the test section 1, and the other end is connected to the corner 12. The other end of the corner 12 is connected to the round bottom square 11. The other end of the round bottom square 11 is connected to the rubber tube 10. The other end of the rubber tube 10 is connected to the water inlet of the pool 9. The water outlet of the pool 9 is connected to the water inlet of the motorized water tank through an inlet pipe. An inlet valve is provided on the inlet pipe to control the process of water delivery to the motorized water tank.

[0075] In implementation, the expansion angle of the diffusion section wall can be set at 3°~5°; the corner can be set to a square, and guide vanes can be installed inside to comb the flow at the corner, reduce eddy currents and disturbances, and improve the stability of the flow field; the round sky and square earth is a transition area, which is a pipe connector, usually set to a transition from square to round to connect round and square pipes, which can reduce flow resistance and disturbances.

[0076] The water source recovery mechanism of the present invention can reduce the resistance and noise of water flow, reduce the impact of water flow on the cave wall and the flow rate, and reduce energy loss by arranging the diffusion section 13, the corner 12, and the round top and square bottom 11; the rubber tube 10 is arranged to replace the valve to control the opening of the flow channel, which can effectively absorb the impact of the fluid and reduce the generation of noise; by arranging the water pool 9 for water source collection, the vibration of water returning to the circulation system can be reduced, the noise can be reduced, and the utilization rate of water resources can be improved.

[0077] Specifically, it also includes an extrusion mechanism, which includes an extrusion analysis module and an extrusion mechanical module, wherein:

[0078] The extrusion analysis module is connected to the data acquisition mechanism and is used to determine whether the rubber tube 10 needs to be squeezed according to the water flow velocity of the test section 1;

[0079] The extrusion mechanical module is respectively connected to the extrusion analysis module and the outer wall of the rubber tube 10, and is used to adjust the extrusion force of the extrusion mechanical module according to the determination result of the extrusion analysis module.

[0080] Specifically, the extrusion analysis module determines the extrusion force of the extrusion mechanical module according to the water flow velocity of the test section 1 and the noise intensity generated by the water flow regulation module during the air pressure driving process.

[0081] During implementation, if the water flow velocity of the test section 1 is less than the preset water flow velocity, it is determined that the rubber tube 10 needs to be squeezed, and the squeezing mechanical module starts squeezing. If the water flow velocity of the test section 1 is greater than or equal to the preset water flow velocity, it is determined that the rubber tube 10 does not need to be squeezed, and the squeezing mechanical module does not work. The actual implementer can set the preset water flow velocity according to the actual situation or based on the average water flow velocity of the test section that has passed the qualification test in the historical data. Preferably, the preset water flow velocity value range is set to 0.1m / s to 0.5m / s.

[0082] It can be understood that the water flow velocity of the test section 1 is negatively correlated with the extrusion force of the extrusion mechanical module, and is negatively correlated with the noise intensity generated by the water flow regulation module during the air pressure driving process. The actual implementers can perform data fitting based on the water flow velocity of the test section during the test of historical data, the noise intensity generated by the water flow regulation module during the air pressure driving process, and the extrusion force of the extrusion mechanical module to determine the extrusion coefficient (related to the water flow velocity and noise intensity), for example: extrusion force JY=JA / (SV×Q), JA is the extrusion coefficient (unit: (dB·N) / (m·s)), SV is the water flow velocity of the test section (unit: m / s), and Q is the noise intensity (unit: dB).

[0083] The present invention provides an extrusion mechanism to extrude the rubber tube 10, thereby controlling the opening of the flow channel and reducing fluid disturbance and noise.

[0084] A noise reduction mechanism, comprising a muffler 6, an iron sand frame 14 and a flexible rubber sheet, wherein the muffler 6 is connected to the water source power mechanism to absorb the noise generated by the water flow regulating module during air pressure driving, and the iron sand frames 14 for absorbing the vibration of the cave body are respectively arranged on the cave walls (outer walls) at both ends of the test section 1, and the flexible rubber sheet is covered and connected to the inner walls of the water source power mechanism, the rectification test mechanism and the water source recovery mechanism to absorb the vibration and noise generated by the fluid during the flow process;

[0085] Specifically, a flow regulating valve is provided on the inner wall of the middle part of the rubber tube, and the water flow regulating module adjusts the water flow cross-sectional area in the rubber tube according to the change in noise intensity generated by the front and rear water flow regulating modules during air pressure driving according to the extrusion force adjustment.

[0086] It can be understood that if the noise intensity generated by the water flow regulating module during the air pressure driving process increases before and after the extrusion force is adjusted, it indicates that the water flow velocity is too fast during the air pressure driving process, resulting in noise during the water flow process. In this case, the flow regulating valve is adjusted to reduce the water flow cross-sectional area in the rubber tube, so that the water flow velocity change rate is reduced, thereby reducing the noise intensity generated by the water flow regulating module during the air pressure driving process before and after the extrusion force is adjusted. If the noise intensity generated by the water flow regulating module during the air pressure driving process before and after the extrusion force is adjusted is reduced, the flow regulating valve can be adjusted to increase the water flow cross-sectional area in the rubber tube, thereby increasing the water flow velocity change rate and increasing the water source recovery efficiency.

[0087] In implementation, the water flow cross-sectional area adjustment amount in the rubber tube is adjusted according to the change amount of the noise intensity generated by the water flow regulating module during the air pressure driving process before and after the squeezing force adjustment, the first ratio is determined according to the ratio of the change amount of the noise intensity generated by the water flow regulating module during the air pressure driving process before and after the squeezing force adjustment to the noise intensity before the adjustment, and the water flow cross-sectional area in the rubber tube after adjustment is determined according to the product of the first ratio and the standard cross-sectional area. The actual implementation personnel can set the standard cross-sectional area according to the water flow cross-sectional area in the rubber tube corresponding to the minimum value of the change amount of the noise intensity generated during the air pressure driving process in the experimental process that has passed the qualification inspection in the actual situation or based on historical data, or set the standard cross-sectional area based on 2 / 3 to 4 / 5 of the cross-sectional area of ​​the rubber tube.

[0088] Specifically, the flexible rubber sheet is covered and connected to the inner walls of the contraction section 2 , the rectification section 3 , the high-level water tank 4 , the motorized water tank 7 , the round top and square bottom 11 , the corner 12 and the diffusion section 13 .

[0089] Specifically, the iron sand frame 14 is filled with iron sand.

[0090] It can be understood that during the bonding process, it is ensured that the rubber sheet fits tightly against the inner wall of the cave body, and that the inner wall of the entire flow channel is smooth and has no protrusions, so as to reduce the resistance and noise during fluid flow. The selected rubber sheet material is as soft as possible to better absorb the noise generated during the fluid flow, thereby further enhancing the noise reduction effect of the entire circulating water tunnel.

[0091] It should be noted that there is no limitation on the specific structure and equipment of the silencer, as long as it can eliminate gas noise.

[0092] The water source power mechanism of the present invention replaces the water pump driving water source transmission by air pressure drive, which can reduce the noise generated by the drive. The rectification test mechanism can reduce the eddy current generated during the flow of the water source, reduce the turbulence of the test section 1, and improve the quality of the test flow field by setting the rectification section 3, the contraction section 2 and the test section 1. The water source recovery mechanism maintains the water volume balance and stabilizes the water flow of the circulating water tunnel by collecting the water source. The noise reduction mechanism further reduces the noise generated during the air pressure drive by setting the muffler 6, and the iron sand frame 14 is set to absorb the vibration energy generated by the cave body under the action of the fluid and suppress the generation of noise. The soft rubber plate can not only improve the sealing performance, but also effectively absorb the vibration generated by the fluid during the flow process and reduce the propagation of noise. The data acquisition mechanism can provide data support for data analysis by collecting the water level of the high-level water tank 4 and the water flow velocity of the test section 1.

[0093] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A circulating water tunnel with a low noise environment, characterized in that: include: A water source power mechanism, comprising a high-level water tank and a water flow regulating module, wherein the high-level water tank is used to carry water source, and the water flow regulating module is connected to the high-level water tank to provide power for the water flow in the high-level water tank through air pressure driving; A rectification test mechanism, which is used to adjust the water flow and conduct a water flow test, wherein the rectification test mechanism comprises a rectification section, a contraction section and a test section, wherein the rectification section, the contraction section and the test section are sequentially connected end to end, one end of the rectification section is connected to the high-level water tank, and the other end is connected to the contraction section, and the test section is connected to a test device; A water source recovery mechanism, which is respectively connected to the rectification test mechanism and the water source power mechanism, and is used to collect the water source discharged by the rectification test mechanism, and transport the discharged water source to the high-level water tank of the water source power mechanism to maintain the water balance of the circulating water tunnel; the water source recovery mechanism includes a rubber tube, and the rubber tube is used to change the water flow speed by squeezing; A noise reduction mechanism, comprising a muffler, an iron sand frame and a flexible rubber sheet, wherein the muffler is connected to the water source power mechanism to absorb the noise generated by the water flow regulating module during air pressure driving, and the iron sand frames for absorbing the vibration of the cave body are respectively arranged on the cave walls at both ends of the test section, and the flexible rubber sheet is covered and connected to the inner wall of the water source power mechanism, the rectification test mechanism and the water source recovery mechanism to absorb the vibration and noise generated by the fluid during the flow process; A data acquisition mechanism, which is respectively connected to the water source power mechanism and the rectification test mechanism, and is used to obtain the water level of the high-level water tank, the water flow velocity of the test section, and the noise intensity generated by the water flow regulation module during the air pressure driving process; The water flow regulating module includes an air storage tank, a motorized water tank and a regulating unit; Wherein, the gas storage tank is used to store and release gas, and the gas storage tank is provided with a plurality of air inlets, and the air inlets are arranged inside the motorized water tank to release the gas in the gas storage tank into the motorized water tank; The motorized water tank is connected to the air inlet and the high-level water tank respectively, and is used to store water, and when the air inlet releases gas, the water in the motorized water tank is pushed up to the high-level water tank; The control unit is connected to the data acquisition mechanism, the gas storage tank and the air inlet respectively, and is used to adjust the air pressure of the gas storage tank and the opening of the air inlet according to the water level of the high-level water tank; An extrusion mechanism, which is used to control the opening of the flow channel; The extrusion mechanism includes an extrusion analysis module and an extrusion mechanical module, wherein: The extrusion analysis module is connected to the data acquisition mechanism and is used to determine whether the rubber tube needs to be squeezed according to the water flow velocity of the test section; The extrusion mechanical module is respectively connected to the extrusion analysis module and the outer wall of the rubber tube, and is used to adjust the extrusion force of the extrusion mechanical module according to the determination result of the extrusion analysis module.

2. The low-noise environment circulating water tunnel according to claim 1 is characterized in that: The water source recovery mechanism comprises a diffusion section, a corner, a round top and a square bottom, a rubber tube and a pool, wherein the diffusion section, the corner, the round top and the square bottom, the rubber tube and the pool are sequentially connected end to end; Wherein, one end of the diffusion section is connected to the water outlet of the test section to reduce the water flow velocity; The corner is used to reduce the impact force of water flow on the elbow; The inner wall cross-sectional area of ​​the rubber tube is smaller than the inner wall cross-sectional area of ​​the round-sky-square-square; The round top and square bottom are used to reduce the impact force on the corner when the rubber tube is squeezed; The water pool is connected to the water source power mechanism, and is used to collect the water source discharged from the rectification test mechanism, and to transport the discharged water source to the motorized water tank through a circulation pump to maintain the water balance of the circulating water tunnel.

3. The low-noise environment circulating water tunnel according to claim 2 is characterized in that: The extrusion analysis module determines the extrusion force of the extrusion mechanical module according to the water flow velocity of the test section and the noise intensity.

4. The low-noise environment circulating water tunnel according to claim 3 is characterized in that: The control unit compares the water level of the high-level water tank with a preset water level threshold, adjusts the air pressure of the gas storage tank according to the comparison result, and adjusts the opening of the air inlet according to the water level of the high-level water tank and the air pressure of the gas storage tank.

5. The low-noise environment circulating water tunnel according to claim 4, characterized in that: A flow regulating valve is provided on the inner wall of the middle part of the rubber tube, and the water flow regulating module adjusts the water flow cross-sectional area in the rubber tube according to the change in noise intensity generated by the front and rear water flow regulating modules during air pressure driving according to the extrusion force adjustment.

6. The low-noise environment circulating water tunnel according to claim 5, characterized in that: The flexible rubber sheet is covered and connected to the inner wall of the contraction section, the rectification section, the high-level water tank, the motorized water tank, the round top and square bottom, the corner and the diffusion section.

7. The low-noise environment circulating water tunnel according to claim 6, characterized in that: The rectification test mechanism determines the length of the test section according to the ratio of the inlet cross-sectional area to the outlet cross-sectional area of ​​the contraction section.

8. The low-noise environment circulating water tunnel according to claim 7, characterized in that: Damping nets are arranged at the inlet and outlet of the contraction section.

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