A multifunctional cavitation jet test device

Abstract

This application relates to the technical field of cavitation jet equipment, and particularly to a multifunctional cavitation jet test device, including: a mounting frame; a main body of a circulating water tunnel, which is installed on the mounting frame. A water tunnel space is formed inside the main body of the circulating water tunnel, and an observation window is provided on the main body of the circulating water tunnel; a circulation unit, which is connected to the mounting frame and is connected to the main body of the circulating water tunnel for changing the liquid flow rate and liquid pressure in the water tunnel space; a cavitation nozzle, which is connected to the main body of the circulating water tunnel and is located in the water tunnel space, and the cavitation jet emitted by the cavitation nozzle is located in the interval directly opposite to the observation window. This application has the effect that it is convenient for a high-speed camera to photograph and record the formation, development, and collapse process of cavitation of the cavitation jet under different liquid flow states through the observation window, and it is convenient to emit the cavitation jet through the cavitation nozzle, and cooperate with the main body of the circulating water tunnel and the circulation unit to complete the research on the influence of flow field characteristics on the action mechanism of the cavitation jet.

Description

Technical Field

[0001] This application relates to the technical field of cavitating jet equipment, and in particular to a multifunctional cavitating jet test device. Background Art

[0002] Cavitating jet technology is a jet enhancement technology based on the principle of hydrodynamic cavitation. Through a specific nozzle structure, the pressure in certain areas is reduced below the liquid saturation vapor pressure, resulting in the formation of a large number of cavitation bubbles in the jet beam. When the jet acts on the target object, the bubbles will rupture and generate a certain local high pressure, enhancing the erosion ability and efficiency of the jet, improving the cleaning effect and fragmentation effect. And the cavitation test device is a necessary condition for carrying out cavitation research. Through controllable parameter tests, the mechanisms and laws related to the formation, development, and collapse of cavitation are explored, discovered, and verified.

[0003] The general cavitation test water tunnel is the most common cavitation test device, mainly used for studying the cavitation characteristics of underwater vehicles and fluid machinery. However, due to the relatively low flow velocity, it is difficult to form obvious material erosion in a short time, and a special cavitation erosion test device is required. Currently, the standard device for jet cavitation erosion research is a submerged water jet test bench that meets the ASTM G134 standard. A high-pressure nozzle is used to generate high-speed jet cavitation in a sealed container, and the test piece is placed in the cavitation collapse area to carry out cavitation erosion tests. On this basis, a prior art discloses an underwater cavitating jet cleaning test bench, which includes: a test bench frame, on which a water tank is provided; a motion mechanism, which includes a first motion device, a second motion device, and a third motion device. The first motion device is connected to the test bench frame, the second motion device is connected to the first motion device, and the third motion device is connected to the second motion device. The first motion device drives the second motion device to move along a first direction, and the second motion device drives the third motion device to move along a second direction; a spraying device, installed at the end of the third motion device and extending into the experimental space of the water tank, and the third motion device drives the spraying device to move along a third direction, where the first direction, the second direction, and the third direction are different from each other; a control device, which is electrically connected to the motion mechanism and the spraying device.

[0004] In view of the above related technologies, although the disclosed underwater cavitating jet cleaning test bench can explore the cavitation erosion effect by adjusting test parameters such as jet velocity, jet angle, action target distance, and nozzle type, however, in addition to being affected by the above factors, cavitating jets are also affected by the flow field characteristics, and the underwater cavitating jet cleaning test bench cannot complete the research on the influence of flow field characteristics on the action mechanism of cavitating jets. Summary of the Invention

[0005] In order to be able to study the influence of flow field characteristics on the action mechanism of cavitating jets, this application provides a multifunctional cavitating jet test device.

[0006] A multifunctional cavitating jet test device provided by this application adopts the following technical solution:

[0007] A multifunctional cavitating jet test device, comprising:

[0008] An installation frame;

[0009] A main body of a circulating water tunnel, the main body of the circulating water tunnel is installed on the installation frame, a water tunnel space is formed inside the main body of the circulating water tunnel, and an observation window is provided on the main body of the circulating water tunnel;

[0010] A circulation unit, the circulation unit is connected to the installation frame, and the circulation unit is connected to the main body of the circulating water tunnel for changing the liquid flow rate and liquid pressure in the water tunnel space;

[0011] A cavitating nozzle, the cavitating nozzle is connected to the main body of the circulating water tunnel and is located in the water tunnel space, and the cavitating jet emitted by the cavitating nozzle is located in the interval directly opposite to the observation window.

[0012] By adopting the above technical solution, liquid is input into the main body of the circulating water tunnel through the circulation unit, and the liquid flow rate in the main body of the circulating water tunnel is changed by adjusting the input parameters of the circulation unit such as the liquid input speed, or the liquid pressure in the main body of the circulating water tunnel is changed by adjusting the input parameters of the circulation unit such as the liquid input-output ratio. Then, an external high-pressure unit inputs liquid into the cavitating nozzle, and the liquid is ejected from the cavitating nozzle to form a cavitating jet. The emission direction of the cavitating jet is parallel to the liquid flow direction in the main body of the circulating water tunnel. Then, with the aid of a high-speed camera, the cavitation formation, development, and collapse processes of the cavitating jet under different liquid flow states are recorded through the observation window on the main body of the circulating water tunnel. Then, by studying and comparing the cavitation formation, development, and collapse processes under different liquid flow states, the research on the influence of flow field characteristics on the action mechanism of the cavitating jet is completed; the designed multifunctional cavitating jet test device can form a closed water tunnel space through the main body of the circulating water tunnel, and then cooperate with the circulation unit to control the flow field characteristics such as fluid velocity and liquid pressure in the water tunnel space. And through the observation window, it is convenient for the high-speed camera to photograph and record the cavitation formation, development, and collapse processes of the cavitating jet under different liquid flow states. Through the cavitating nozzle, it is convenient to emit the cavitating jet to cooperate with the main body of the circulating water tunnel and the circulation unit to complete the research on the influence of flow field characteristics on the action mechanism of the cavitating jet.

[0013] In a specific feasible embodiment, the main body of the circulating water tunnel comprises:

[0014] The test section is connected to the installation frame. A transparent viewing window serving as an observation window is connected to the test section. The cavitation nozzle is detachably and fixedly connected to the test section. A fixture for clamping a test specimen is connected inside the test section;

[0015] Two steady flow sections are symmetrically arranged with respect to the test section and are connected to the test section. The liquid inlet and outlet of the circulation unit are respectively connected to the two steady flow sections.

[0016] By adopting the above technical solution, the designed main body of the circulating water tunnel can provide an installation basis for the cavitation nozzle and the steady flow section through the test section, form an observation window through the transparent viewing window, and clamp the object to be measured through the fixture, so as to study the cavitation erosion effect of the cavitation jet on the object to be measured under different flow field characteristics.

[0017] In a specific feasible implementation, the steady flow section includes:

[0018] A hollow shell is connected to the test section and is also connected to the circulation unit;

[0019] A porous partition is installed inside the hollow shell, and the connection between the circulation unit and the hollow shell is located on the side of the porous partition away from the test section;

[0020] Multiple flow guiding plates are connected to the hollow shell and are located between the porous partition and the test section.

[0021] By adopting the above technical solution, the designed steady flow section can provide an installation space for the porous partition and the flow guiding plates through the hollow shell, and cooperate with the test section to form a water tunnel space. The porous partition can reduce the vortex scale of the liquid inflow and lower the inflow turbulence intensity. The flow guiding plates can further promote the flow uniformity of the fluid and further reduce the influence of the turbulence intensity on the stability of the fluid flow pattern, ensuring the accuracy of the research on the action mechanism of the cavitation jet.

[0022] In a specific feasible implementation, a maintenance door is detachably connected to the hollow shell.

[0023] By adopting the above technical solution, the designed maintenance door can facilitate the cleaning, maintenance and replacement operations of the porous partition and the flow guiding plates, and can quickly remove the test residues intercepted at the porous partition.

[0024] In a specific feasible implementation, the inner hole size of the side of the hollow shell facing the test section gradually decreases.

[0025] By adopting the above technical solution, a hollow shell with a gradually decreasing inner hole size on the side facing the test section can further promote the uniformization of fluid flow, thereby reducing the influence of turbulence intensity on the stability of the fluid flow pattern and ensuring the accuracy of the research on the mechanism of cavitating jet action.

[0026] In a specific feasible implementation, a safety valve and an automatic exhaust valve are connected to the steady flow section.

[0027] By adopting the above technical solution, the designed safety valve and automatic exhaust valve can automatically discharge the liquid when the liquid pressure in the water tunnel space is too high, and the automatic exhaust valve can discharge the bubbles generated after the cavitating jet contacts the flow field in the water tunnel space.

[0028] In a specific feasible implementation, a storage rack is connected to the installation frame, and the storage rack forms a placement platform on one side of the main body of the circulating water tunnel.

[0029] By adopting the above technical solution, the designed storage rack can facilitate the placement of observation and recording instruments such as high-speed cameras and lighting fixtures.

[0030] In a specific feasible implementation, the circulation unit includes a circulation pump, a water tank, at least one filter, two solenoid valves, and multiple circulation pipes;

[0031] The circulation pump, the water tank, and the filter are connected in series through the circulation pipes to form a circulation main body, and the circulation pipes connect the circulation main body to the steady flow section;

[0032] The solenoid valves are connected to the circulation pipes, and the two solenoid valves are respectively located at the water outlet end and the water inlet end of the circulation pump.

[0033] By adopting the above technical solution, the designed circulation unit can provide power for the liquid circulation in the water tunnel space through the circulation pump, temporarily store the extra liquid required for pressurization in the water tunnel space through the water tank, purify the liquid through the filter to reduce the influence of liquid impurities on the research of the cavitating jet action mechanism or the cavitation effect research on the object to be tested, control the input and output flow rates of the water tunnel space through the opening and closing of the solenoid valves, thereby changing the liquid pressure in the water tunnel space, and form a complete loop by connecting various components through the circulation pipes.

[0034] In a specific feasible implementation, a plurality of fixed feet are connected to the test section, horizontal strip-shaped grooves are provided on the fixed feet, and the connecting piece between the fixed feet and the installation frame is arranged through the strip-shaped grooves.

[0035] By adopting the above technical solution, the designed fixed feet can adjust the horizontal position of the test section while realizing the installation and fixation of the test section.

[0036] In a specific feasible embodiment, a cover plate is detachably connected to the test section, and a three-axis platform is detachably connected to the test section. The cavitation nozzle can be installed on the three-axis platform to achieve three-dimensional spatial movement.

[0037] By adopting the above technical solution, first open the cover plate, then remove the connection structure between the cavitation nozzle and the test section, and then install the three-axis platform on the test section. The three-axis platform extends into the water tunnel space through the notch corresponding to the cover plate to fix the cavitation nozzle, and then the three-axis platform drives the cavitation nozzle to move according to a preset trajectory, so that the cavitation jet ejected by the cavitation nozzle acts on the object to be measured at different jet velocities, jet angles, action target distances, etc., further improving the research on the influence of the parameter changes brought by the three-dimensional trajectory movement of the cavitation nozzle on the cavitation erosion effect of the object to be measured; the designed cover plate and three-axis platform can cooperate to achieve the three-dimensional spatial movement of the cavitation nozzle, further improving the research on the influence of the parameter changes brought by the three-dimensional trajectory movement of the cavitation nozzle on the cavitation erosion effect of the object to be measured.

[0038] In summary, the present application includes at least one of the following beneficial technical effects:

[0039] 1. The designed multifunctional cavitation jet test device can form a closed water tunnel space through the circulating water tunnel main body, and then cooperate with the circulation unit to control the flow field characteristics in the water tunnel space, such as fluid velocity and liquid pressure. And through the observation window, it is convenient for the high-speed camera to shoot and record the cavitation formation, development and collapse processes of the cavitation jet under different liquid flow states. Through the cavitation nozzle, it is convenient to emit the cavitation jet to cooperate with the circulating water tunnel main body and the circulation unit to complete the research on the influence of the flow field characteristics on the action mechanism of the cavitation jet.

[0040] 2. The designed multifunctional cavitation jet test device can provide an installation space for the porous partition plate and the flow guide plate through the hollow shell, and cooperate with the test section to form a water tunnel space. Through the porous partition plate, the vortex scale of the liquid inflow can be reduced, and the incoming flow turbulence can be reduced. Through the flow guide plate, the fluid flow uniformity can be further promoted, and the influence of the turbulence on the fluid flow state stability can be further reduced, ensuring the accuracy of the research on the action mechanism of the cavitation jet.

[0041] 3. The designed multifunctional cavitation jet test device can cooperate to achieve the three-dimensional spatial movement of the cavitation nozzle through the cover plate and the three-axis platform, further improving the research on the influence of the parameter changes brought by the three-dimensional trajectory movement of the cavitation nozzle on the cavitation erosion effect of the object to be measured. Description of the Drawings

[0042] Figure 1 It is a schematic structural diagram of the multifunctional cavitation jet test device according to the embodiment of the present application.

[0043] Figure 2 yes Figure 1 Schematic diagram of the relative position structure of the fixture and cavitation nozzle in the water hole space.

[0044] Figure 3 yes Figure 2 Schematic diagram of the local structure of the medium steady flow section.

[0045] Figure 4 is Figure 3 Schematic diagram of the structure after further optimization of the foundation.

[0046] Figure 5 is Figure 2 On this basis, a schematic diagram of the assembly structure of the three-axis platform and the test section during the open experiment is shown.

[0047] Figure 6 yes Figure 5 Schematic diagram of the planar structure, mainly used to show the structure of the circulation unit.

[0048] Figure 7 It is a schematic diagram of the three-dimensional structure of the three-axis platform in the embodiment of the present application.

[0049] Explanation of the reference numerals: 1. Mounting frame; 2. Circulating water tunnel body; 21. Test section; 211. Transparent window; 212. Clamp; 213. Cover plate; 22. Flow stabilization section; 221. Hollow shell; 222. Porous partition; 223. Guide plate; 224. Inspection door; 23. Safety valve; 24. Automatic exhaust valve; 3. Circulation unit; 31. Circulation pump; 32. Water tank; 33. Filter; 34. Solenoid valve; 35. Circulation pipe; 4. Cavitation nozzle; 5. Storage rack; 6. Fixed leg; 61. Strip groove; 7. Three-axis platform; 8. Sensor group. DETAILED DESCRIPTION

[0050] The following is combined with Figures 1-7 This application is described in further detail.

[0051] The embodiment of the present application discloses a multifunctional cavitation jet testing device.

[0052] Reference Figure 1 A multifunctional cavitation jet test device includes a mounting frame 1 and a circulating water tunnel body 2. The circulating water tunnel body 2 is connected to the mounting frame 1, and a water tunnel space is formed inside the circulating water tunnel body 2. In order to facilitate the observation of the test conditions in the water tunnel space, the circulating water tunnel body 2 is provided with an observation window. In the present application, the number of observation windows on the circulating water tunnel body 2 can be one, two, or three, as long as the test conditions in the water tunnel space can be fully observed. In the present embodiment, the number of observation windows on the circulating water tunnel body 2 is two.

[0053] Referring to Figure 2 , in order to be able to complete the research on the action mechanism of cavitating jet by flow field characteristics in the main body 2 of the circulating water tunnel, the multifunctional cavitating jet test device further includes a circulating unit 3 and a cavitating nozzle 4. The circulating unit 3 is connected to the mounting frame 1, and the circulating unit 3 is connected to the main body 2 of the circulating water tunnel and communicates with the water tunnel space, and is used to change the liquid flow velocity and liquid pressure in the water tunnel space; the cavitating nozzle 4 is installed on the main body 2 of the circulating water tunnel, and the cavitating nozzle 4 is located in the water tunnel space, and the cavitating jet emitted by the cavitating nozzle 4 is located in the observation interval facing the observation window, and the formation, development and collapse processes of cavitation of the cavitating jet in the water tunnel space under different liquid flow states are photographed and recorded by a high-speed camera.

[0054] Referring to Figure 2 and Figure 3 , in order to facilitate the formation of a stable circulating flow field in cooperation with the circulating unit 3, the main body 2 of the circulating water tunnel includes a test section 21 and two steady flow sections 22. The test section 21 is connected to the mounting frame 1, and a transparent window 211 serving as an observation window is hermetically connected to the test section 21 through a flange. The cavitating nozzle 4 is connected to the inner cavity of the test section 21 through a cavitating jet gun handle. In order to facilitate the fixation of the object to be measured, a fixture 212 for clamping and fixing the test specimen is bolted in the test section 21. In this application, the fixture 212 is similar to a bench vise and can clamp plate-shaped or cylindrical objects to be measured. The fixture 212 is a slide rail and slider structure. In terms of absolute coordinates, it can move back and forth, left and right, and up and down. Taking the direction towards the fixture 212 as the Z-axis as the coordinate system reference, the cavitating jet gun handle can drive the cavitating nozzle 4 to achieve displacement movement in the X-axis direction or the Y-axis direction alone.

[0055] Referring to Figure 2 , in order to be able to measure the flow field characteristic parameters in the water tunnel space such as liquid flow velocity, liquid pressure, and liquid temperature, a sensor group 8 is flange-connected to the bottom wall of the test section 21. The sensor group 8 contains corresponding sensor types required for measuring the foregoing flow field characteristic parameters, such as liquid flow velocity sensors, liquid pressure sensors, and liquid temperature sensors, etc.

[0056] Referring to Figure 2 and Figure 3 , the steady flow sections 22 are symmetrically arranged with respect to the test section 21, and the steady flow sections 22 and the test section 21 are hermetically connected through connecting flanges. The test section 21 and the two steady flow sections 22 cooperate to form a closed water tunnel space, and the liquid inlet and outlet of the circulating unit 3 are respectively flange-connected to the two steady flow sections 22.

[0057] Referring to Figure 2 and Figure 3, Further, in order to improve the fluid flow uniformity in the water tunnel space through the flow stabilization section 22, the flow stabilization section 22 includes a hollow shell 221, a porous partition 222, and multiple flow guiding plates 223. The hollow shell 221 is flange-connected to the test section 21 and is connected to the circulation unit 3. The porous partition 222 is bolted to the hollow shell 221, and the porous partition 222 divides the inner cavity of the hollow shell 221 into two chambers. The connection between the circulation unit 3 and the hollow shell 221 is located on the side of the porous partition 222 away from the test section 21. When the oncoming flow passes through the multiple through-holes on the porous partition 222, the vortex scale of the liquid oncoming flow can be reduced, the oncoming flow turbulence intensity can be lowered, and the water flow kinetic energy can be offset, slowing down the flow velocity of the water flow.

[0058] Refer to Figure 3 and Figure 4 , in the present application, the number of the porous partitions 222 can be multiple. The multiple porous partitions 222 are arranged in a fitting manner to form a porous group. The hollow shell 221 is provided with multiple bolt holes arranged in a straight line. When the porous partition 222 is fixed, bolts are inserted into different bolt holes, so that the overlapping area range of the holes between the multiple porous partitions 222 is changed, thereby changing the size of the communication path between the two chambers on both sides of the porous group, and the holes on the multiple porous partitions 222 can completely coincide; by providing multiple porous partitions 222, on the basis that the circulation unit 31 can adjust the fluid turbulence intensity in the test section 21, by changing the overlapping area size between the multiple porous partitions 222, an adjustable parameter can be added to the adjustment of the fluid turbulence intensity in the test section 21. When changing the fluid parameters in the test section 21, it can be achieved either by changing the input parameters of the circulation unit 3 or by changing the position parameters of the porous partition 222.

[0059] Refer to Figure 2 and Figure 3 , the flow guiding plates 223 are bolted to the hollow shell 221. The flow guiding plates 223 are located between the porous partition 222 and the test section 21, and the multiple flow guiding plates 223 are arranged parallel to each other. By changing the distance between the flow guiding plates 223 or the included angle between the flow guiding plates 223 and the cavitation nozzle 4, the fluid flow uniformity can be further promoted, the influence of the turbulence intensity on the fluid flow state stability can be further reduced, and the accuracy of the research on the cavitation jet action mechanism can be ensured.

[0060] Refer to Figure 2 and Figure 3 , in order to facilitate the cleaning, maintenance, and replacement operations of the porous partition 222 and the flow guiding plates 223, and to be able to quickly remove the test residues intercepted at the porous partition 222, a maintenance door 224 is bolted to the hollow shell 221, and a sealing ring is embedded between the maintenance door 224 and the hollow shell 221 to ensure the sealing of the water tunnel space.

[0061] Refer toFigure 3 , in order to further promote the uniformization of fluid flow, thereby reducing the influence of turbulence intensity on the stability of fluid flow pattern and ensuring the accuracy of the research on the mechanism of cavitating jet, the inner hole size of the side of the hollow shell 221 facing the test section 21 gradually decreases. By changing the inner hole size and matching the fluid flow direction in the water tunnel space, the uniformization of flow can be promoted, and the effect of further reducing turbulence intensity can be achieved.

[0062] Refer to Figure 3 , in order to automatically discharge the liquid when the liquid pressure in the water tunnel space is too high, the automatic exhaust valve 24 can discharge the bubbles generated after the cavitating jet contacts the flow field in the water tunnel space. The flange of the hollow shell 221 is connected with a safety valve 23 and an automatic exhaust valve 24. The liquid is automatically discharged through the safety valve 23, and the bubbles in the water tunnel space are discharged through the automatic exhaust valve 24.

[0063] Refer to Figure 5 , in order to facilitate the placement of observation and recording instruments such as high-speed cameras and lighting fixtures, a storage rack 5 is connected to the installation frame 1. The storage rack 5 is located on one side of the test section 21, and a placement platform is formed on one side of the transparent window 211. In order to facilitate the height adjustment of the storage rack 5, a vertical adjustment groove is opened on the installation frame 1. The sliding end of the storage rack 5 is slidably connected to the vertical adjustment groove, and the position of the storage rack 5 is fixed by bolts.

[0064] Refer to Figure 5 , in order to realize the horizontal position adjustment of the test section 21 along the connection direction of the two steady flow sections 22, a plurality of fixed feet 6 are welded and fixed on the test section 21. A horizontally arranged strip-shaped groove 61 is opened on the fixed feet 6. A plurality of connecting shafts are integrally connected to the installation frame 1. The connecting shafts pass through the strip-shaped groove 61, and fastening bolts are threadedly connected to the connecting shafts.

[0065] Refer to Figure 6 , in order to adjust the characteristic parameters of the flow field in the water tunnel space, it is further disclosed that the circulation unit 3 includes a circulation pump 31, a water tank 32, a filter 33, a solenoid valve 34 and a circulation pipe 35. The circulation pump 31, the water tank 32 and the filter 33 are flange-connected and connected in series through the circulation pipe 35 to form a circulation main body, and the circulation pipe 35 connects and communicates the circulation main body with the hollow shell 221 to form a complete liquid circulation loop; in this application, the number of filters 33 can be one, two, or three, as long as the cleanliness of the liquid can be ensured. In this embodiment, the number of filters 33 is two, and the two filters 33 are respectively arranged close to the two hollow shells 221.

[0066] Refer to Figure 6, in the present application, the number of the solenoid valves 34 is two. The solenoid valves 34 are flange-connected to the circulation pipe 35, and the two solenoid valves 34 are respectively arranged close to the two hollow shells 221 in the liquid circulation loop, that is, the solenoid valves 34 are located on the water outlet side and the water inlet side of the circulation pump 31. By changing the flow-through diameters of the two solenoid valves 34, the liquid input and liquid output amounts in the water cavity space can be changed, and finally the liquid pressure control in the water cavity space can be realized.

[0067] Referring to Figure 5 , Figure 6 and Figure 7 , in order to improve the research on the influence of the parameter changes brought by the three-dimensional trajectory movement of the cavitation nozzle 4 on the cavitation effect of the object to be measured, an operation port is opened on the test section 21, and a cover plate 213 for blocking the operation port is bolted to the test section 21. A three-axis platform 7 is bolted to the test section 21. After the cavitation nozzle 4 is removed from the test section 21, it can be installed and fixed on the moving end of the three-axis platform 7 to realize the three-dimensional movement of the cavitation nozzle 4 in space. Among them, the three-axis platform 7 includes a mounting substrate, a three-axis platform X-axis, a three-axis platform Y-axis and a three-axis platform Z-axis. The mounting substrate is bolted to the test section 21, and the three-axis platform Z-axis is used to mount the cavitation jet gun handle of the cavitation nozzle 4.

[0068] The implementation principle of a multifunctional cavitation jet test device in an embodiment of the present application is as follows: in a closed state, liquid is input into the circulating water tunnel main body 2 through the circulation unit 3, and the liquid flow rate in the circulating water tunnel main body 2 is changed by adjusting the input parameters of the circulation unit 3, such as the liquid input speed, or the liquid pressure in the circulating water tunnel main body 2 is changed by adjusting the input parameters of the circulation unit 3, such as the liquid input-output ratio. Then, the external high-pressure unit inputs liquid into the cavitation nozzle 4, and the liquid sprays out through the cavitation nozzle 4 to form a cavitation jet. The emission direction of the cavitation jet is parallel to the liquid flow direction in the circulating water tunnel main body 2. Then, with the help of a high-speed camera, the cavitation formation, development and collapse processes of the cavitation jet under different liquid flow states are recorded through the observation window on the circulating water tunnel main body 2. Then, by studying and comparing and analyzing the cavitation formation, development and collapse processes under different liquid flow states, the research on the influence mechanism of the flow field characteristics on the cavitation jet is completed.

[0069] In the open state, first open the cover plate 213, then remove the connection structure between the cavitation nozzle 4 and the test section 21, then install the three-axis platform 7 on the test section 21. The three-axis platform 7 extends into the water cavity space through the notch corresponding to the cover plate 213 to fix the cavitation nozzle 4, and then the three-axis platform 7 drives the cavitation nozzle 4 to move according to a preset trajectory, so that the cavitation jet ejected by the cavitation nozzle 4 acts on the object to be measured with different jet speeds, jet angles and action target distances, etc., further improving the research on the influence of the parameter changes brought by the three-dimensional trajectory movement of the cavitation nozzle 4 on the cavitation effect of the object to be measured.

[0070] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A multifunctional cavitation jet test method, comprising: Mounting frame (1); A circulating water tunnel body (2), the circulating water tunnel body (2) being mounted on the mounting frame (1), a water tunnel space being formed inside the circulating water tunnel body (2), and an observation window being provided on the circulating water tunnel body (2); A circulation unit (3), the circulation unit (3) being connected to the mounting frame (1), and the circulation unit (3) being connected to the circulation water tunnel body (2), and being used for changing the liquid flow rate and liquid pressure in the water tunnel space; a cavitation nozzle (4), the cavitation nozzle (4) being connected to the circulating water tunnel body (2) and being located in the water tunnel space, and the cavitation jet emitted by the cavitation nozzle (4) being located in the area directly facing the observation window; The circulating water tunnel body (2) comprises a test section (21), the test section (21) is connected to the mounting frame (1), a transparent window (211) serving as an observation window is connected to the test section (21), the cavitation nozzle (4) is detachably fixedly connected to the test section (21), and a fixture (212) for clamping a test sample is connected inside the test section (21); The test section (21) is detachably connected to a cover plate (213), and the test section (21) is detachably connected to a three-axis platform (7), and the cavitation nozzle (4) can be installed on the three-axis platform (7) to achieve three-dimensional movement in space; In a closed state, liquid is input into the circulating water tunnel body (2) through the circulating unit (3), and the liquid flow rate in the circulating water tunnel body (2) is changed by adjusting the liquid input speed of the circulating unit (3), or the liquid input and output volume of the circulating unit (3) is adjusted to change the liquid pressure in the circulating water tunnel body (2); An external high-pressure unit inputs liquid into the cavitation nozzle (4), and the liquid is ejected through the cavitation nozzle (4) to form a cavitation jet, and the emission direction of the cavitation jet is parallel to the flow direction of the liquid in the circulating water tunnel body (2); Using a high-speed camera, the cavitation formation, development and collapse process of the cavitation jet under different liquid flow states is recorded through an observation window on the circulating water tunnel body (2); By studying and comparing the formation, development and collapse of cavitation under different liquid flow states, the influence of flow field characteristics on the mechanism of cavitation jet is studied; In the open state, the cover plate (213) is first opened, and then the connection structure between the cavitation nozzle (4) and the test section (21) is removed, and then the three-axis platform (7) is installed on the test section (21), and the three-axis platform (7) extends into the water tunnel space through the notch corresponding to the cover plate (213) to fix the cavitation nozzle (4); The three-axis platform (7) drives the cavitation nozzle (4) to move along a preset trajectory, so that the cavitation jet ejected by the cavitation nozzle (4) acts on the object to be measured at different jet velocities, jet angles and target distances, thereby improving the study on the influence of parameter changes caused by the movement of the cavitation nozzle (4) along a three-dimensional trajectory on the cavitation effect of the object to be measured.

2. The multifunctional cavitation jet test method according to claim 1, characterized in that: The circulating water tunnel body (2) also includes: Two flow stabilizing sections (22), the two flow stabilizing sections (22) are symmetrically arranged with respect to the test section (21), the flow stabilizing sections (22) are connected to the test section (21), and the liquid inlet and outlet of the circulation unit (3) are respectively connected to the two flow stabilizing sections (22).

3. The multifunctional cavitation jet test method according to claim 2, characterized in that: The flow stabilizing section (22) comprises: A hollow shell (221), wherein the hollow shell (221) is connected to the test section (21), and the hollow shell (221) is connected to the circulation unit (3); A porous partition (222), wherein the porous partition (222) is installed in the hollow shell (221), and a connection between the circulation unit (3) and the hollow shell (221) is located on a side of the porous partition (222) away from the test section (21); A plurality of guide plates (223), wherein the guide plates (223) are connected to the hollow shell (221), and the guide plates (223) are located between the porous partition plate (222) and the test section (21); and an inspection door (224) is detachably connected to the hollow shell (221).

4. The multifunctional cavitation jet test method according to claim 3, characterized in that: The inner hole size of the hollow shell (221) gradually decreases toward one side of the test section (21).

5. The multifunctional cavitation jet test method according to claim 2, characterized in that: The flow stabilizing section (22) is connected to a safety valve (23) and an automatic exhaust valve (24).

6. The multifunctional cavitation jet test method according to claim 1, characterized in that: The installation frame (1) is connected to a storage rack (5), and the storage rack (5) forms a placement platform on one side of the circulating water tunnel body (2).

7. The multifunctional cavitation jet test method according to claim 2, characterized in that: The circulation unit (3) comprises a circulation pump (31), a water tank (32), at least one filter (33), two solenoid valves (34) and a plurality of circulation pipes (35); The circulation pump (31), the water tank (32) and the filter (33) are connected in series via the circulation pipe (35) to form a circulation body, and the circulation pipe (35) connects the circulation body with the steady flow section (22); The solenoid valve (34) is connected to the circulation pipe (35), and the two solenoid valves (34) are respectively located at the water outlet and water inlet of the circulation pump (31).

8. The multifunctional cavitation jet test method according to claim 2, characterized in that: The test section (21) is connected to a plurality of fixed legs (6), the fixed legs (6) are provided with horizontally arranged strip grooves (61), and the connecting pieces between the fixed legs (6) and the mounting frame (1) are arranged through the strip grooves (61).

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