Experimental system and method for synchronously measuring internal and external flow fields of cross-medium water inlet cavitation

Abstract

The invention provides a synchronous measurement experiment system and method for internal and external flow fields of a cross-medium water inlet cavitation bubble, and belongs to the field of flow field measurement tests. The problems that an existing particle sowing mode cannot be effectively applied to the cross-medium water entry process and particles cannot be evenly sown to the air domain in an undisturbed mode are solved. A cross-medium water entry cavitation internal and external flow field synchronous measurement experiment system comprises a test water tank which is internally provided with water mixed with a certain number of liquid-phase fluorescent particles; the particle sowing device is used for releasing gas-phase fluorescent particles with preset concentration and preset speed, so that the gas-phase fluorescent particles stall when moving to the central area of the release path of the water-entering structure; the inlet end of the particle dispersing assembly is connected with the ventilation system, and the particle dispersing assembly is used for mixing the gas-phase fluorescent particles and the gas to the preset concentration under the control of the ventilation system and conveying the gas-phase fluorescent particles and the gas to the particle sowing device according to the preset speed. The device is mainly used for the synchronous measurement experiment of the internal and external flow fields of the cross-medium water inlet cavitation.

Description

Technical Field

[0001] The present invention belongs to the field of flow field measurement experiments, and in particular relates to a system and method for synchronously measuring the internal and external flow fields of a cross-medium water-entering cavitation bubble. Background Art

[0002] Marine engineering projects such as large ship bow slamming, high-speed entry, and unmanned submersible deployment involve cross-media entry. Structural entry often generates splash and cavitation, which affect the structure's entry load and posture. The development and evolution of splash and cavitation are the result of the interaction between the gas and liquid phases. Understanding the gas-liquid flow field during this process is fundamental to studying the mechanisms of splash and cavitation evolution. Traditional particle image velocimetry (PIV) can only measure the liquid phase flow field (outside the entry cavitation) during entry. Measuring the flow field in the air domain and within the entry cavitation during entry requires addressing the issues of uniform and stable seeding of tracer particles in the air domain and the disturbance of the original flow field during seeding. The key to achieving simultaneous measurement of the flow field inside and outside the cross-media entry cavitation is to achieve efficient, convenient, stable, controllable, uniform, and disturbance-free seeding of tracer particles into the air domain, while ensuring that the tracer particles in the gas phase are drawn into the cavitation during entry and cavitation development.

[0003] Publication No. CN106644353A discloses a PIV wind tunnel test method for measuring the air flow field of ships. This method relies on the wind tunnel flow itself to carry tracer particles to achieve the measurement of the single-phase flow field in the air domain. However, this method can only achieve particle spreading in the air domain and gas phase flow field tracing, and can only perform particle spreading and tracing in an environment where the air itself is flowing. For the cross-medium water entry process, the air domain is in a static state before the structure moves. This method cannot effectively spread particles, and is even less suitable for measuring the flow field inside the air domain and the water-entering cavitation during the cross-medium water entry process. Publication No. CN104729827A discloses a device for observing the laws of ventilation cavitation flow fields. The device pre-places particles in the internal cavity of the test model and sprays the particles out with ventilation gas to achieve the spreading of tracer particles in the cavitation. However, this spreading device cannot achieve long-term, continuous and stable spreading of particles in the cavitation and control the spreading concentration. Publication No. CN108020168B discloses a three-dimensional measurement system and method for gas-liquid two-phase flow fields near the free surface based on particle image velocimetry. This method achieves simultaneous observation of the two-phase flow fields near the free surface, in the air domain above and the water domain below, by simultaneously seeding particles in the water domain and air domain. However, the air domain and water domain are actually separate single-phase flow field observations, making them unsuitable for measuring the flow fields inside and outside cavitation under cross-media conditions. Furthermore, this method and experimental system also rely on the air domain itself to achieve particle seeding, making them unsuitable for situations where the air domain is initially static. Summary of the Invention

[0004] In view of this, the present invention aims to propose an experimental system and method for synchronous measurement of the internal and external flow fields of a cross-media water entry cavitation, so as to solve the problem that the existing particle seeding method cannot be effectively applied to the cross-media water entry process and cannot seed particles into the air domain evenly and undisturbedly.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions. According to one aspect of the present invention, a cross-medium water-entry cavitation internal and external flow field synchronous measurement experimental system is provided, comprising:

[0006] A test water tank is provided with water mixed with a certain amount of liquid fluorescent particles, and a release component is arranged above the water for releasing the structure into the water at a preset time;

[0007] A particle spreading device is provided above the test water tank and is used to release gas-phase fluorescent particles of a predetermined concentration and a predetermined speed toward the periphery of the release path of the submerged structure, so that the gas-phase fluorescent particles stall when they reach the center of the release path of the submerged structure;

[0008] A particle dispersion assembly, the inlet of which is connected to the ventilation system, and the outlet of which is connected to the inlet of the particle sowing device, is used to mix the gas-phase fluorescent particles with the gas to a predetermined concentration under the control of the ventilation system and deliver the gas-phase fluorescent particles to the particle sowing device at a predetermined speed;

[0009] Laser systems for irradiating areas above and below the water;

[0010] The high-speed camera system is used to record the motion state of liquid-phase fluorescent particles and gas-phase fluorescent particles during the process of the submerged structure crossing the medium.

[0011] Furthermore, a structural frame is provided around the test water tank for fixing the release assembly.

[0012] Furthermore, the particle spreading device includes a first air inlet, an oblique air outlet and an annular shell. The central axis of the annular shell is coaxial with the release route of the water-entering structure. A plurality of oblique air outlets inclined away from the central axis are arranged on the circumference of the annular shell. The first air inlet is connected to the annular shell for introducing gaseous fluorescent particles.

[0013] Furthermore, the particle dispersion component includes a particle holding part, which is provided with a second air inlet and an air outlet, a plurality of porous plates are arranged between the second air inlet and the air outlet, and a particle addition port is arranged between the two porous plates near the second air inlet.

[0014] Furthermore, a gas blocking portion for guiding the airflow toward the peripheral side is provided at the second air inlet.

[0015] Furthermore, the diameters of the plurality of porous plates decrease sequentially along the direction of airflow movement.

[0016] Furthermore, the ventilation system includes an air compressor, a pressure regulating valve, a solenoid valve, a gas flow meter and a throttle valve connected in sequence, and the throttle valve is communicated with the inlet end of the particle dispersion component.

[0017] Furthermore, the laser system includes a laser generator, a light guide arm connected to the laser generator, and an optical lens connected to the light guide arm.

[0018] Furthermore, the high-speed camera system includes a high-speed camera, a filter, and a computer. The filter is set in front of the high-speed camera lens, and the high-speed camera is connected to the computer.

[0019] According to another aspect of the present invention, a method for synchronously measuring the internal and external flow fields of a cross-medium water-entry cavitation bubble using the above-mentioned experimental system is provided, comprising the following steps:

[0020] A certain amount of liquid-phase fluorescent particles is mixed into the water in the test water tank, a predetermined concentration of gas-phase fluorescent particles is set in the particle dispersion assembly, and the gas and gas-phase fluorescent particles are fully mixed, and the submerged structure is lifted to a predetermined height and fixed;

[0021] After turning on the laser system, the particle spreading device spreads gaseous fluorescent particles of a predetermined concentration at a certain speed and observes and records them through a high-speed camera system. After the gaseous fluorescent particles are evenly distributed, the spreading of the gaseous fluorescent particles is stopped, the particles are released into the water structure and recorded by the high-speed camera system. After the shooting is completed, the experimental system is turned off.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This system can spread particles in the static air domain. Combined with the high-speed camera system and the synchronous triggering of the water-entering structure, it can realize the synchronous observation of the multiphase flow field in the air domain above the liquid surface, the gas domain inside the water-entering cavitation domain and the external water domain during the cross-medium water entry process.

[0024] 2. The particle dispersion component adopts a cylindrical structure, with a double-layer gradient porous plate structure in the middle and lower layers. The coarse-porous plate in the lower layer initially disperses the particles, and the fine-porous plate in the middle layer secondary enhances turbulent shear, achieving efficient dispersion and atomization of fluorescent particles and uniform mixing with the gas, ensuring long-term stable suspension and continuous supply of gas-phase tracer particles. A particle addition hole is also provided for convenient addition of tracer particles.

[0025] 3. The particle spreading device is a circular hollow tube with a first air inlet and an annular oblique air outlet on the lower surface. Utilizing an annular symmetrical layout and low-speed laminar flow release, the particles are evenly diffused 360° from the periphery to the center, with the momentum gradually decaying to zero. This ensures that the particle spreading process does not disturb the central area and does not interfere with the flow field measurement results during the structure entering the water.

[0026] 4. Integrated pressure regulating valve, throttle valve and high-precision flow meter to achieve closed-loop control of air pressure, flow rate and particle concentration. Through the rapid response of the solenoid valve and real-time flow monitoring, the particle seeding speed is controlled, and the initial particle concentration in the air domain is regulated. It can also adapt to the dynamic experimental requirements of different water entry velocities and cavitation sizes.

[0027] 5. The overall structure is simple and the modular design is easy to disassemble and debug quickly, which greatly reduces the time and economic costs of the experiment;

[0028] 6. It can be applied to complex cross-media multiphase flow problems such as ship bow slamming and structure entry and exit of water across media. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 This is a schematic structural diagram of an experimental system for synchronously measuring the internal and external flow fields of a cross-medium water-entry cavitation according to the present invention;

[0031] Figure 2 is a front view of the particle dispersion assembly of the present invention;

[0032] Figure 3 is a cross-sectional view of the particle dispersion assembly of the present invention;

[0033] Figure 4 is an outline diagram of the particle spreading device according to the present invention;

[0034] Figure 5 A half-sectional view of the particle spreading device according to the present invention;

[0035] Figure 6 This is a flow chart of the method of using the experimental system for synchronously measuring the internal and external flow fields of a cross-media water-entering cavitation according to the present invention.

[0036] Test water tank 1; structural frame 2; support frame 3; electromagnet 4; particle spreading device 5; first air inlet 5-1; oblique air outlet 5-2; annular shell 5-3; particle dispersion component 6; air outlet 6-1; particle holding part 6-2; particle adding port 6-3; second air inlet 6-4; gas blocking part 6-5; lower porous plate 6-6; middle porous plate 6-7; throttle valve 7; gas flow meter 8; solenoid valve 9; pressure regulating valve 10; air compressor 11; laser generator 12; light guide arm 13; optical lens 14; high-speed camera 15; filter 16; computer 17; liquid-phase fluorescent particles 18; gas-phase fluorescent particles 19. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0038] It should be noted that the descriptions of the present invention regarding directions such as "left", "right", "left side", "right side", "upper", "lower", "top", and "bottom" are all defined based on the relationship between the orientations or positions shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure described must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0039] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0040] Referring to the accompanying drawings, this embodiment is described. According to one aspect of the present invention, a cross-medium water-entry cavitation internal and external flow field synchronous measurement experimental system is provided, comprising:

[0041] A test water tank 1 is filled with water mixed with a predetermined number of liquid-phase fluorescent particles 18. Above the water, a release assembly is positioned for releasing a submerged structure at a predetermined time. A structural frame 2 is provided around the test water tank 1 to secure the release assembly, specifically an electromagnet 4 secured to the structural frame 2 via a support frame 3. The length and position of the support frame 3 can be adjusted to ensure that the electromagnet 4 is positioned above the center of the test water tank 1. The submerged structure is a small ball that can be attracted by the electromagnet 4.

[0042] The particle spreading device 5 is arranged above the test water tank 1 and is used to release gaseous fluorescent particles 19 of a predetermined concentration and a predetermined speed to the periphery of the release path of the water-entering structure, so that the gaseous fluorescent particles 19 stall when they move to the central area of ​​the release path of the water-entering structure; the particle spreading device 5 is set to evenly spread the particles and at the same time make the particles stall in the central area, so as to prevent the speed of the particles themselves from affecting the water entry process.

[0043] The particle dispersing assembly 6 has an inlet connected to the ventilation system and an outlet connected to the inlet of the particle sowing device 5, and is used to mix the gas phase fluorescent particles 19 with the gas to a predetermined concentration under the control of the ventilation system and deliver the gas phase fluorescent particles 19 to the particle sowing device 5 at a predetermined speed;

[0044] Laser systems for irradiating areas above and below the water;

[0045] The high-speed camera system is used to record the motion state of the liquid-phase fluorescent particles 18 and the gas-phase fluorescent particles 19 during the process of the submerged structure crossing the medium.

[0046] In this embodiment, the particle spreading device 5 comprises a first air inlet 5-1, oblique air outlets 5-2, and an annular housing 5-3. The central axis of the annular housing 5-3 is coaxial with the release path of the submerged structure. Several oblique air outlets 5-2 are disposed on the periphery of the annular housing 5-3, tilted away from the central axis. The first air inlet 5-1 is connected to the annular housing 5-3 for introducing gaseous fluorescent particles 19. The annular housing 5-3 is specifically connected to the support frame 3 to secure it. The oblique air outlets 5-2 serve primarily to guide the gaseous fluorescent particles 19. They can be located on the bottom wall of the annular housing 5-3 or on the periphery. Their primary purpose is to uniformly diffuse the gaseous fluorescent particles 19 from the periphery 360° toward the center, gradually decaying their momentum to zero. This allows the decelerated particle-containing gas to uniformly diffuse toward the periphery in a low-speed laminar flow, ensuring that the particle spreading process does not disturb the central region and interfere with flow field measurements during the submerged structure. After entering through inlet 5-1, the gas mixed with the gas-phase fluorescent particles 19 circulates to both sides through annular housing 5-3, reducing gas momentum and preventing the formation of a high-speed jet. The gas is then evenly and stably dispersed into the air domain through outlet 5-2. The particle dispersing device 5 is installed so that its axis coincides with the vertical line of the structure's descent, ensuring a smooth descent and more uniform particle distribution. During the structure's descent, the gas-phase fluorescent particles 19 dispersed in the air domain are entrained and enter the water cavitation, dispersing the particles within the gas domain within the cavitation.

[0047] In this embodiment, the particle dispersing assembly 6 includes a particle container 6-2 in a cylindrical housing. The particle container 6-2 is provided with a second air inlet 6-4 and an air outlet 6-1. A plurality of porous plates are positioned between the second air inlet 6-4 and the air outlet 6-1. A particle addition port 6-3 is positioned between two porous plates near the second air inlet 6-4. The particle addition port 6-3 is used to add gas-phase fluorescent particles 19. A portion of the particles can be pre-added before the experiment, and further additions can be made in real time based on the actual concentration required.

[0048] In this embodiment, a gas blocking portion 6-5 is provided at the second air inlet 6-4 for directing the airflow toward the periphery. The gas blocking portion 6-5 is provided primarily to divert the gas from the second air inlet 6-4 so that the gas is uniformly ejected along the gas blocking portion 6-5 to the periphery, thereby ensuring sufficient contact between the gas and the particles.

[0049] In this embodiment, the diameters of the plurality of porous plates decrease sequentially along the direction of airflow. Specifically, two porous plates are provided: a lower porous plate 6-6 located near the second air inlet 6-4, and a middle porous plate 6-7 located near the air outlet 6-1, specifically in the middle of the particle holding portion 6-2. Both the lower porous plate 6-6 and the middle porous plate 6-7 are provided with evenly spaced openings, and the diameter of the openings in the lower porous plate 6-6 is larger than the diameter of the openings in the middle porous plate 6-7. As the gas flowing through the gas blocking portion 6-5 first passes through the lower porous plate 6-6, it exerts a strong turbulent shearing effect on the particles, causing the particles to be fully dispersed and mixed with the gas. The particle-carrying gas then passes through the middle porous plate 6-7, further strengthening the turbulent shearing effect, causing the gas-phase fluorescent particles 19 to be further dispersed and fully mixed with the gas. After mixing with the fluorescent particles, the gas flows out through the air outlet 6-1.

[0050] In this embodiment, the ventilation system includes an air compressor 11, a pressure regulating valve 10, a solenoid valve 9, a gas flow meter 8, and a throttle valve 7, which are connected in sequence. The throttle valve 7 is connected to the inlet end of the particle dispersion component 6. The air compressor 11 is used to store compressed gas, and a pressure gauge is installed on it to ensure pressure safety; the pressure regulating valve 10 can adjust the appropriate ventilation pressure and ensure that the test has a stable pressure output; the solenoid valve 9 can quickly control the opening and closing of the gas path; the gas flow meter 8 is used to obtain the flow rate of the test gas path, making the test more refined and ensuring the repeatability of the test particle sowing effect; the throttle valve 7 is used to adjust the flow rate of the test gas path to adjust the ventilation volume to the best particle sowing effect. The particle dispersion component and the particle sowing device are connected in sequence to the end of the ventilation system. The three together realize the efficient, convenient, continuous, stable, controllable, uniform and disturbance-free sowing of gas-phase fluorescent particles.

[0051] In this embodiment, the laser system includes a laser generator 12, a light-guiding arm 13 connected to the laser generator 12, and an optical lens 14 connected to the light-guiding arm 13. The laser sheet illumination range must cover both the upper and lower sides of the free liquid surface. Specifically, the laser is illuminated from the side, and the light sheet must cover both the upper and lower sides of the free liquid surface to meet the background light source requirements for synchronous capture of multiphase flow fields.

[0052] In this embodiment, the high-speed imaging system includes a high-speed camera 15, a filter 16, and a computer 17. The filter 16 is positioned in front of the lens of the high-speed camera 15, which is connected to the computer 17. Specifically, two high-speed cameras 15 are arranged vertically, and the two high-speed cameras capture images perpendicular to the light curtain, enabling simultaneous observation of the multiphase flow field in the air domain above the liquid surface, the gas domain within the water-entering cavitation, and the external water domain. The filter 16 is positioned in front of the lens of the high-speed camera 15 to eliminate strong reflections from the gas-liquid interface.

[0053] According to another aspect of the present invention, a method for synchronously measuring the internal and external flow fields of a cross-medium water-entry cavitation bubble using the above-mentioned experimental system is provided, comprising the following steps:

[0054] Before the test, set up the high-speed camera 15 and the laser system, adjust the focus plane of the high-speed camera 15, the laser light curtain, and the vertical line of the water structure to be coplanar, mix the liquid-phase fluorescent particles 18 of appropriate concentration into the water in the test water tank 1, and observe the mixing effect of the liquid-phase fluorescent particles 18 through the high-speed camera 15. Set the gas-phase fluorescent particles 19 of a predetermined concentration in the particle dispersion component 6 and fully mix the gas and gas-phase fluorescent particles 19 to achieve the best effect. Record the readings of the pressure regulating valve 10 and the gas flow meter 8 at this time to ensure the repeatability of the particle mixing effect. Set the electromagnet 4 switch and the high-speed camera 15 for synchronous triggering. Lift the water structure to the predetermined height and fix it. At this point, the preparations before the experiment are completed.

[0055] During the test, the laser generator 12 of the laser system is turned on and the solenoid valve 9 is opened. The particle sowing device 5 sows gas-phase fluorescent particles 19 of a predetermined concentration at a certain speed and observes and records it through the high-speed camera system and the computer 17 screen. After the gas-phase fluorescent particles 19 are evenly distributed, the solenoid valve 9 is closed to stop sowing the gas-phase fluorescent particles 19. The synchronous trigger switch is pressed, the submerged structure is released and recorded by the high-speed camera system. After the shooting is completed, the experimental system is closed.

[0056] The pre-mixing method ensures that the gas phase fluorescent particles 19 are fully mixed with the gas, and the deceleration injection and the center zone stall method shield the impact on the water entry process of the water entry structure, so that the test results are highly accurate and repeatable.

[0057] The embodiments of the present invention disclosed above are intended only to illustrate the present invention. The embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A cross-medium water-entry cavitation internal and external flow field synchronous measurement experimental system, characterized by: include: A test water tank (1) is provided with water mixed with a certain amount of liquid-phase fluorescent particles (18) and a release component is arranged above the water for releasing the structure into the water at a preset time; A particle spreading device (5) is arranged above the test water tank (1) and is used to release gas-phase fluorescent particles (19) of a predetermined concentration and a predetermined speed toward the periphery of the release path of the water-entering structure, so that the gas-phase fluorescent particles (19) stall when they move to the central area of ​​the release path of the water-entering structure; A particle dispersing assembly (6) having an inlet end connected to a ventilation system and an outlet end connected to an inlet end of a particle spreading device (5), for mixing gaseous fluorescent particles (19) with gas to a predetermined concentration under the control of the ventilation system and delivering the gaseous fluorescent particles (19) to the particle spreading device (5) at a predetermined speed; Laser systems for irradiating areas above and below the water; A high-speed camera system is used to record the motion state of liquid-phase fluorescent particles (18) and gas-phase fluorescent particles (19) during the process of a structure entering water and crossing a medium.

2. The synchronous measurement experimental system for the internal and external flow fields of a cross-medium water-entry cavitation according to claim 1 is characterized by: A structural frame (2) is provided on the periphery of the test water tank (1) for fixing the release assembly.

3. The synchronous measurement experimental system for the internal and external flow fields of a cross-medium water-entry cavitation according to claim 1 is characterized by: The particle spreading device (5) comprises a first air inlet (5-1), an oblique air outlet (5-2) and an annular shell (5-3); the central axis of the annular shell (5-3) is coaxial with the release route of the water-entering structure; a plurality of oblique air outlets (5-2) inclined away from the central axis are provided on the circumference of the annular shell (5-3); the first air inlet (5-1) is connected to the annular shell (5-3) for introducing gas-phase fluorescent particles (19).

4. A cross-medium water-entry cavitation internal and external flow field synchronous measurement experimental system according to claim 1, 2 or 3, characterized in that: The particle dispersion assembly (6) comprises a particle holding portion (6-2) of a cylindrical shell, wherein the particle holding portion (6-2) is provided with a second air inlet (6-4) and an air outlet (6-1), a plurality of porous plates are provided between the second air inlet (6-4) and the air outlet (6-1), and a particle addition port (6-3) is arranged between two porous plates near the second air inlet (6-4).

5. The synchronous measurement experimental system for the internal and external flow fields of a cross-medium water-entry cavitation according to claim 4 is characterized by: The second air inlet (6-4) is provided with a gas blocking portion (6-5) for guiding the air flow toward the peripheral side.

6. The cross-medium water-entry cavitation internal and external flow field synchronous measurement experimental system according to claim 4, characterized in that: The diameters of the plurality of porous plates decrease sequentially along the direction of air flow.

7. A cross-medium water-entry cavitation internal and external flow field synchronous measurement experimental system according to claim 1, 2, 3, 5 or 6, characterized in that: The ventilation system comprises an air compressor (11), a pressure regulating valve (10), a solenoid valve (9), a gas flow meter (8) and a throttle valve (7) connected in sequence, and the throttle valve (7) is communicated with the inlet end of the particle dispersion component (6).

8. The cross-medium water-entry cavitation internal and external flow field synchronous measurement experimental system according to claim 7, characterized in that: The laser system comprises a laser generator (12), a light guide arm (13) connected to the laser generator (12), and an optical lens (14) connected to the light guide arm (13).

9. The cross-medium water-entry cavitation internal and external flow field synchronous measurement experimental system according to claim 1, characterized in that: The high-speed camera system comprises a high-speed camera (15), a filter (16), and a computer (17). The filter (16) is arranged in front of the lens of the high-speed camera (15), and the high-speed camera (15) is connected to the computer (17).

10. A method for using the cross-medium water-entry cavitation internal and external flow field synchronous measurement experimental system according to claim 1, 2, 3, 5, 6, 8 or 9, characterized in that: The steps include: A certain amount of liquid-phase fluorescent particles (18) is mixed into the water in the test water tank (1), a predetermined concentration of gas-phase fluorescent particles (19) is set in the particle dispersion component (6), and the gas and the gas-phase fluorescent particles (19) are fully mixed, and the submerged structure is lifted to a predetermined height and fixed; after the laser system is turned on, the particle spreading device (5) spreads the gas-phase fluorescent particles (19) of the predetermined concentration at a certain speed and observes and records them through a high-speed camera system; after the gas-phase fluorescent particles (19) are evenly distributed, the spreading of the gas-phase fluorescent particles (19) is stopped, the submerged structure is released, and the high-speed camera system is used to record the situation; after the shooting is completed, the experimental system is closed.

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