Dual-ventilation supercavity experimental model capable of continuously adjusting spacing and use method thereof

Abstract

The invention discloses a dual-ventilation supercavity experimental model capable of continuously adjusting spacing and a use method thereof, and relates to the technical field of water tunnel experimental equipment. The problems that an existing supercavitation experiment model cannot continuously adjust the parallel model distance, and due to discrete distance adjustment, cavitation coupling mechanism research is incomplete, and critical state capture is not accurate are solved. The device comprises a spacing-adjustable base and two groups of ventilation models which are mounted at the upper end of the spacing-adjustable base and are arranged in parallel, a cavitator is mounted at the rear end of a multidirectional connection supporting system in each group of ventilation model, and a flow stabilizing assembly is mounted at the front end of the multidirectional connection supporting system; the lower ends of the multi-direction connection supporting systems of the two ventilation models are connected with the two rotating parts in the distance-adjustable base correspondingly, and continuous adjustment of the distance between the two ventilation models is achieved. According to the cavitator, the cavitation coupling critical state can be accurately captured by uniformly distributing the ventilation micropores in the cavitator head in the circumferential direction and combining the independent adjustment function of the double models. The method is mainly used for double-ventilation supercavitation research.

Description

Technical Field

[0001] The present invention relates to the technical field of water tunnel experimental equipment, and particularly relates to a double-ventilated supercavitation experimental model with continuously adjustable spacing and a using method thereof. Background Technique

[0002] The supercavitation drag reduction technology forms a cavitation structure that wraps the underwater vehicle through active ventilation, which can significantly reduce the viscous drag when the underwater vehicle moves at high speed, and shows important application value in the fields of submarine-launched weapons and underwater vehicles. With the in-depth development of the concept of cluster warfare, the research on the coupled flow characteristics of parallel double-ventilated supercavitation has become a frontier hot spot, and its cavitation interaction mechanism directly affects the stability and strike effectiveness of the cluster movement of underwater vehicles. However, the double-ventilated supercavitation flow involves strong coupling of solid-liquid-gas multiphases. The cavitation interface evolution process is accompanied by complex vortex shedding and pressure pulsation phenomena, with significant nonlinear characteristics. Thoroughly mastering its internal mechanical mechanism is a huge challenge.

[0003] The current research on the flow characteristics of double cavitation mainly relies on the circulating water tunnel experimental system. By fixing the relative positions of the double underwater vehicle models and controlling the oncoming flow conditions for observation and analysis, there are still defects in the key technical links of the existing experimental models. Most traditional experimental devices adopt a mechanical positioning structure with pre-processed fixed installation positions. This design not only leads to repeated processing of structural models with different spacings for multi-condition experiments, resulting in increased experimental costs and waste of resources; more importantly, the adjustment of the double-model spacing always shows discrete changes, and continuous and smooth adjustment and multi-directional position adjustment cannot be achieved. This high-cost and discretized parameter control mode is not only difficult to accurately capture the critical conditions of the sudden change of the double-cavitation flow state, but also difficult to effectively reveal the non-linear relationship between the double-cavitation flow state and the spacing.

[0004] To sum up, the existing supercavitation experimental models have problems that the spacing of the parallel models cannot be continuously adjusted, the research on the cavitation coupling mechanism is incomplete due to discrete spacing adjustment, and the critical state capture is inaccurate. Therefore, it is necessary to develop an experimental model with the ability to continuously adjust the spacing to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems that the existing supercavitation experimental models have the inability to continuously adjust the spacing of the parallel models, the incomplete research on the cavitation coupling mechanism due to discrete spacing adjustment, and the inaccurate capture of the critical state, and further provide a double-ventilated supercavitation experimental model with continuously adjustable spacing and a using method thereof.

[0006] The technical solution of the present invention is as follows:

[0007] A double-ventilated supercavitation experimental model with continuously adjustable spacing, which includes an adjustable-spacing base and two groups of ventilated models arranged in parallel at the upper end of the adjustable-spacing base. Each group of ventilated models includes a cavitator, a multi-directional connection support system, and a flow-stabilizing component. The multi-directional connection support system includes a tail support rod 3, a tee connection support rod 5, and a side support rod 7. The tee connection support rod 5 is provided with three connection ports. The connection port at the rear end of the tee connection support rod 5 is connected to the front end of the horizontally arranged tail support rod 3. The rear end of the tail support rod 3 is connected to the cavitator. The flow-stabilizing component includes a flow-stabilizing tail cone 6. The connection port at the front end of the tee connection support rod 5 is connected to the horizontally arranged flow-stabilizing tail cone 6. The connection port at the lower end of the tee connection support rod 5 is connected to the upper end of the vertically arranged tee connection support rod 5. The adjustable-spacing base includes a support frame 12, two rotating disks 9, two rotating disk pressing plates 10, and a tubular gasket 11. Two rotating disk embedding holes are symmetrically opened on both sides of the central axis on the upper surface of the support frame 12. The rotating disk 9 is a circular stepped structure. An eccentric hole is opened on the upper surface of the rotating disk 9. The upper small-diameter ends of the two rotating disks 9 are respectively rotatably embedded in the two rotating disk embedding holes. Two rotating disk pressing plates 10 are respectively provided below the lower large-diameter ends of the two rotating disks 9. Each rotating disk pressing plate 10 is detachably connected to the support frame 12 through a rotating disk pressing plate - support frame connecting piece. The lower ends of the side support rods 7 in the two groups of ventilated models respectively pass through the two eccentric holes, the two rotating disk pressing plates 10, and the tubular gasket 11 from bottom to top and are connected through a side support rod - rotating disk connecting piece.

[0008] Further, the cavitator includes a cavitator head 1 and a cavitator base 2. The front end of the cavitator base 2 is connected to the rear end of the tail support rod 3. A stepped inner cavity is opened at the rear end of the cavitator base 2. The cavitator head 1 includes a front-end cylindrical section and a rear-end frustum section integrally formed with the front-end cylindrical section. The front-end cylindrical section of the cavitator head 1 is embedded in the small-diameter hole section of the stepped inner cavity. A plurality of ventilation micropores are circumferentially distributed on the wall surface of the front-end cylindrical section of the cavitator head 1. The plurality of ventilation micropores are all located in the large-diameter section of the stepped inner cavity of the cavitator base 2.

[0009] Further, the number of ventilation micropores on the cavitator head 1 is four. The ventilation diameters of the four ventilation micropores are all 1 mm, and the ventilation micropores are 6 mm away from the end face of the cavitator head 1.

[0010] Further, two pressure measurement holes are evenly distributed on the wall surface of the tail support rod 3 and are arranged obliquely.

[0011] Further, the diameter of the pressure measurement hole on the tail support rod 3 is 3 mm. The pressure measurement hole is 30 mm away from the front end face of the tail support rod 3, and the inclination angle of the pressure measurement hole is 45°.

[0012] Furthermore, the flow stabilizing assembly also includes a flow stabilizing wing 8 , which is a streamlined structure. A vertically arranged flow stabilizing wing mounting hole is provided on the upper surface of the flow stabilizing wing 8 , and the flow stabilizing wing 8 is sleeved on the side support rod 7 .

[0013] Furthermore, the multi-directional connection support system also includes a locking sleeve 4, the front end of the tail support rod 3 is inserted into the inner cavity of the connection port at the front end of the three-way connection support rod 5, the front end side of the three-way connection support rod 5 is provided with an external thread, the locking sleeve 4 includes a cylindrical section and a truncated cone section integrally formed with the cylindrical section, the inner hole of the truncated cone section of the locking sleeve 4 matches the tail support rod 3, the inner hole of the cylindrical section of the locking sleeve 4 is provided with an internal thread, and the locking sleeve 4 is threadedly connected to the tail support rod 3.

[0014] Furthermore, the rotating disk pressure plate-support frame connecting member is a bolt, and the number of the rotating disk pressure plate-support frame connecting bolts is multiple. A plurality of evenly arranged threaded holes are provided on the lower surface of the support frame 12, and a plurality of pressure plate mounting holes are provided on the upper surface of the rotating disk pressure plate 10. The plurality of pressure plate mounting holes correspond one-to-one to the plurality of threaded holes, respectively. The rotating disk pressure plate 10 and the support frame 12 are connected by a plurality of bolts.

[0015] Furthermore, the side support rod-rotating disk connecting piece is a nut, an external thread is processed on the lower side of the side support rod 7, a nut is installed on the lower threaded section of the side support rod 7, and the side support rod 7 and the rotating disk 9 are fixed by tightening the nut.

[0016] The present invention also provides a method for using a double-ventilation supercavitation experimental model with continuously adjustable spacing, which is achieved by the following method:

[0017] Before the experiment, the spacing between the two groups of ventilation models is adjusted; first, the two groups of ventilation models are installed on the adjustable spacing base by inserting the two side support rods 7 into the eccentric holes of the two rotating disks 9, the central hole of the rotating disk pressure plate 10 and the tubular pad 11 from top to bottom, and then the multiple bolts on the rotating disk pressure plate 10 are loosened; then, the two rotating disks 9 are manually rotated respectively to change the angle of the eccentric hole of each rotating disk 9, thereby changing the spacing between the two side support rods 7; finally, when the angle direction of the two side support rods 7 and the ventilation model reaches the predetermined working condition of the experiment, tighten the multiple bolts of the rotating disk pressure plate 10 and the nuts under the tubular pad 11 to ensure that the rotating disk 9 and the side support rods 7 are fixed and there is no relative sliding between the two, so as to achieve the fixation of the two groups of ventilation models;

[0018] During the experiment, first, gas is introduced into the two groups of ventilation models, and the gas is transported to the cavitator head 1 through the inner cavity of the side support rod 7, the three-way connecting support rod 5 and the tail support rod 3 in turn, and it is ensured that the gas is evenly discharged only through the four ventilation micropores on the cavitator head 1; then, the airflow is led out through the pressure-leading pipe and the pressure inside the cavitation is collected by a pressure sensor, and then the flow characteristics are observed by a high-speed camera; finally, when the predetermined flow conditions are reached, the internal pressure and flow characteristics of the cavitation are recorded, and the first round of experiments is completed;

[0019] After each experiment, repeat the above steps to proceed to the next round of experiments.

[0020] Compared with the prior art, the present invention has the following effects:

[0021] 1. In the dual-ventilation supercavitation experimental model with continuously adjustable spacing of the present invention, the ventilation model is provided with an adjustable spacing base, and the spacing between the side support rods 7 inserted in the eccentric holes of the two movable rotating disks 9 is changed by rotating the two rotating disks 9 respectively, so that the spacing between the two groups of ventilation models can be continuously adjusted. The model device of the present invention is simple, stable and reliable.

[0022] 2. The double-ventilated supercavitation experimental model with continuously adjustable spacing of the present invention can specifically adjust the model distance according to the experimental results obtained, accurately capture the critical conditions for the sudden change of the double-cavitation flow state, and avoid the limitation of the traditional technology that requires pre-processing of multiple spacing models.

[0023] 3. The ventilation model in the dual-ventilation supercavitation experimental model with continuously adjustable spacing of the present invention can realize independent active ventilation of two groups of ventilation models, support asymmetric ventilation volume setting, is closer to reality, and thus makes the experimental results more convincing.

[0024] 4. In the dual-ventilation supercavitation experimental model with continuously adjustable spacing of the present invention, the wall surface of the cavitator head 1 in the ventilation model is provided with four ventilation micropores evenly distributed along the circumferential direction, so that the gas can be discharged evenly and stable supercavitation can be easily and quickly formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view of a ventilation model in a double-ventilation supercavitation experimental model with continuously adjustable spacing according to the present invention;

[0026] Figure 2 It is a cross-sectional view of an adjustable spacing base in a double-ventilation supercavitation experimental model with continuously adjustable spacing of the present invention;

[0027] Figure 3 It is an axonometric diagram of the double-ventilation supercavitation experimental model with continuously adjustable spacing of the present invention;

[0028] Figure 4It is a schematic structural diagram after the assembly of the side support rod, rotating disk, rotating disk pressing plate and tubular pad in the double-ventilated supercavitation experimental model with continuously adjustable spacing of the present invention;

[0029] Figure 5 It is a schematic structural diagram of the cavitator in the double-ventilated supercavitation experimental model with continuously adjustable spacing of the present invention;

[0030] Figure 6 It is a schematic structural diagram of the rotating disk in the double-ventilated supercavitation experimental model with continuously adjustable spacing of the present invention.

[0031] In the figure: 1, cavitator head; 2, cavitator base; 3, tail support rod; 4, locking sleeve; 5, three-way connecting support rod; 6, steady-flow tail cone; 7, side support rod; 8, steady-flow wing; 9, rotating disk; 10, rotating disk pressing plate; 11, tubular pad; 12, support frame. Detailed implementation mode

[0032] Detailed implementation mode one: In combination with Figures 1 to 6 To illustrate this implementation mode, a double-ventilated supercavitation experimental model with continuously adjustable spacing of this implementation mode includes an adjustable-spacing base and two groups of ventilated models arranged in parallel on the upper end of the adjustable-spacing base. Each group of ventilated models includes a cavitator, a multi-directional connection support system and a steady-flow component. The multi-directional connection support system includes a tail support rod 3, a three-way connecting support rod 5 and a side support rod 7. Three connection ports are provided on the three-way connecting support rod 5. The connection port at the rear end of the three-way connecting support rod 5 is connected to the front end of the horizontally arranged tail support rod 3. The rear end of the tail support rod 3 is connected to the cavitator. The steady-flow component includes a steady-flow tail cone 6. The connection port at the front end of the three-way connecting support rod 5 is connected to the horizontally arranged steady-flow tail cone 6. The connection port at the lower end of the three-way connecting support rod 5 is connected to the upper end of the vertically arranged three-way connecting support rod 5. The adjustable-spacing base includes a support frame 12, two rotating disks 9, two rotating disk pressing plates 10 and a tubular pad 11. Two rotating disk embedding holes are symmetrically provided on both sides of the central axis on the upper surface of the support frame 12. The rotating disk 9 is a circular stepped structure. An eccentric hole is provided on the upper surface of the rotating disk 9. The upper small-diameter ends of the two rotating disks 9 are respectively rotatably embedded in the two rotating disk embedding holes. Two rotating disk pressing plates 10 are respectively provided below the lower large-diameter ends of the two rotating disks 9. Each rotating disk pressing plate 10 is detachably connected to the support frame 12 through a rotating disk pressing plate - support frame connecting piece. The lower ends of the side support rods 7 in the two groups of ventilated models respectively pass through the two eccentric holes, the two rotating disk pressing plates 10 and the tubular pad 11 from bottom to top and are connected through a side support rod - rotating disk connecting piece.

[0033] In this embodiment, sealing rubber rings are provided at the three connection ports of the tee connection support rod 5 to achieve sealing. A sealing rubber ring is provided between the side surface of the rotating disk 9 and the rotating disk embedding hole of the support frame 12 to achieve sealing. Sealing rubber rings are provided at the three connection ports of the tee connection support rod 5 to achieve sealing.

[0034] In this embodiment, the cavitator base 2 is connected to the front end of the tail support rod 3 by threads. Three threaded connection ports are provided on the tee connection support rod 5. The first threaded connection port is connected to the rear end of the tail support rod 3, the second threaded connection port is connected to the steady flow tail cone 6, and the third threaded connection port is connected to the upper end of the side support rod 7. The steady flow tail cone 6 and the upper end of the side support rod 7 are fixed by screwing into the tee connection support rod 5 through threads.

[0035] Specific embodiment two: Figures 1 to 6 This embodiment will be described in combination with the cavitator of this embodiment including a cavitator head 1 and a cavitator base 2. The front end of the cavitator base 2 is connected to the rear end of the tail support rod 3. A stepped inner cavity is provided at the rear end of the cavitator base 2. The cavitator head 1 includes a front cylindrical section and a rear frustum section integrally formed with the front cylindrical section. The front cylindrical section of the cavitator head 1 is embedded in the small diameter hole section of the stepped inner cavity. A plurality of air vent micropores are circumferentially distributed on the wall surface of the front cylindrical section of the cavitator head 1, and the plurality of air vent micropores are all located in the large diameter section of the stepped inner cavity of the cavitator base 2. Other components and connection relationships are the same as those in the first specific embodiment.

[0036] In this embodiment, an anti-slip rubber ring is provided on the cavitator head 1 and is in contact and cooperation with the inner wall of the cavitator base 2 to achieve fixation.

[0037] Specific embodiment three: Figures 1 to 6 This embodiment will be described in combination with the cavitator head 1 in this embodiment having four air vent micropores. The air vent diameters of the four air vent micropores are all 1 mm, and the air vent micropores are 6 mm away from the end face of the cavitator head 1. With such a setting, uniform gas leakage is achieved, and it is easy to quickly form a stable supercavity. Other components and connection relationships are the same as those in the first or second specific embodiment.

[0038] Specific embodiment four: Figures 1 to 6 This embodiment will be described in combination with the tail support rod 3 in this embodiment having two pressure measurement holes uniformly distributed and obliquely arranged on its wall surface. Other components and connection relationships are the same as those in the first, second, or third specific embodiment.

[0039] Specific embodiment five: Figures 1 to 6To describe this embodiment, the diameter of the pressure measurement hole on the tail support rod 3 of this embodiment is 3 mm, the pressure measurement hole is 30 mm away from the front end face of the tail support rod 3, and the inclination angle of the pressure measurement hole is 45°. Such a setting facilitates the connection of the pressure guiding pipe and realizes the measurement of the internal pressure of the ventilation cavity. The other components and connection relationships are the same as those in the first, second, third, or fourth specific embodiments.

[0040] Specific Embodiment Six: In combination with Figures 1 to 6 To describe this embodiment, the flow stabilizing component of this embodiment further includes a flow stabilizing wing 8. The flow stabilizing wing 8 has a streamlined structure. A vertically arranged flow stabilizing wing mounting hole is provided on the upper surface of the flow stabilizing wing 8, and the flow stabilizing wing 8 is sleeved on the side support rod 7. The other components and connection relationships are the same as those in the first, second, third, fourth, or fifth specific embodiments.

[0041] In this embodiment, the flow stabilizing wing 8 is connected to the side support rod 7 by welding and is subjected to streamlined grinding treatment.

[0042] Specific Embodiment Seven: In combination with Figures 1 to 6 To describe this embodiment, the multi-directional connection support system of this embodiment further includes a locking sleeve 4. The front end of the tail support rod 3 is inserted into the inner cavity of the connection port at the front end of the three-way connection support rod 5. An external thread is provided on the side surface of the front end of the three-way connection support rod 5. The locking sleeve 4 includes a cylindrical section and a frustum section integrally formed with the cylindrical section. The inner hole of the frustum section of the locking sleeve 4 matches the tail support rod 3, and an internal thread is provided in the inner hole of the cylindrical section of the locking sleeve 4. The locking sleeve 4 is threadedly connected to the tail support rod 3. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth, or sixth specific embodiments.

[0043] Specific Embodiment Eight: In combination with Figures 1 to 6 To describe this embodiment, the rotating disk pressing plate - support frame connecting member of this embodiment is a bolt. The number of the rotating disk pressing plate - support frame connecting bolts is multiple. A plurality of uniformly arranged threaded holes are provided on the lower surface of the support frame 12, and a plurality of pressing plate mounting holes are provided on the upper surface of the rotating disk pressing plate 10. The plurality of pressing plate mounting holes respectively correspond to the plurality of threaded holes one by one, and the rotating disk pressing plate 10 and the support frame 12 are connected by a plurality of bolts. With such a setting, the rotating disk pressing plate 10 is connected to the support frame 12 by bolts. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, or seventh specific embodiments.

[0044] Specific Embodiment Nine: In combination with Figures 1 to 6To describe this embodiment, the side support rod - rotating disk connector in this embodiment is a nut. External threads are machined on the lower side surface of the side support rod 7. A nut is installed on the lower threaded section of the side support rod 7. The side support rod 7 and the rotating disk 9 are fixed by tightening the nut. With such a setting, the lower end of the side support rod 7 is threaded, and the side support rod 7 and the rotating disk 9 are fixed by tightening the nut. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, seventh, or eighth specific embodiments.

[0045] Specific embodiment ten: In combination with Figures 1 to 6 To describe this embodiment, a method for using a double - ventilation supercavitation experimental model with continuously adjustable spacing in this embodiment is achieved through the following means.

[0046] Before the experiment, adjust the spacing between the two ventilation models. First, insert the two side support rods 7 into the eccentric holes of the two rotating disks 9, the central holes of the rotating disk pressing plates 10, and the tubular gaskets 11 from top to bottom in sequence to install the two ventilation models on the adjustable - spacing base, and then loosen the multiple bolts on the rotating disk pressing plates 10. Then, manually (or in the way that the rotating shaft of a servo motor or a stepping motor is connected to the lower end of the side support rod 7 through a coupling, and the servo motor or the stepping motor is connected to the controller through a cable to drive the side support rod 7 to rotate) rotate the two rotating disks 9 respectively, so that the eccentric holes of each rotating disk 9 generate angular changes, and further change the spacing between the two side support rods 7. Finally, when the angular directions of the two side support rods 7 and the ventilation models (the rotation angle can be measured by an angle - measuring tool; or the rotation angle can be measured by pre - setting a graduated disk on the upper surface of the cavitator base 2 around the rotating disk 9) reach the predetermined experimental conditions, tighten the multiple bolts of the rotating disk pressing plates 10 and the nuts below the tubular gaskets 11 to ensure that the rotating disk 9 and the side support rod 7 are fixed and there is no relative sliding between them, so as to fix the two ventilation models.

[0047] During the experiment, first, introduce gas (inert gas such as helium or other gases insoluble in water can be used) into the two ventilation models. The gas is transported to the cavitator head 1 through the inner cavities of the side support rod 7, the three - way connecting support rod 5, and the tail support rod 3 in sequence, and ensure that the gas only leaks out evenly through the four ventilation micropores on the cavitator head 1. Then, lead out the air flow through a pressure - guiding pipe and collect the internal pressure of the cavitation bubble with a pressure sensor, and observe the flow characteristics with a high - speed camera. Finally, when the predetermined flow conditions (the required flow velocity and ventilation volume for the experiment) are reached, start to record the internal pressure of the cavitation bubble and the flow characteristics (such as the cavitation bubble shape, etc.). Thus, the first - round experiment is completed.

[0048] Repeat the above steps for the next - round experiment after each experiment.

[0049] Other compositions and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, seventh, eighth, or ninth specific embodiments.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-ventilated supercavitation experimental model with continuously adjustable spacing, characterized in that: It includes an adjustable-spacing base and two groups of ventilation models installed in parallel at the upper end of the adjustable-spacing base. Each group of ventilation models includes a cavitator, a multi-directional connection support system, and a flow-stabilizing component. The multi-directional connection support system includes a tail support rod (3), a tee connection support rod (5), and a side support rod (7). Three connection ports are provided on the tee connection support rod (5). The connection port at the rear end of the tee connection support rod (5) is connected to the front end of the horizontally arranged tail support rod (3). The rear end of the tail support rod (3) is connected to the cavitator. The flow-stabilizing component includes a flow-stabilizing tail cone (6). The connection port at the front end of the tee connection support rod (5) is connected to the horizontally arranged flow-stabilizing tail cone (6). The connection port at the lower end of the tee connection support rod (5) is connected to the upper end of the vertically arranged tee connection support rod (5). The adjustable-spacing base includes a support frame (12), two rotating disks (9), two rotating disk pressing plates (10), and a tubular gasket (11). Two rotating disk embedding holes are symmetrically provided on both sides of the central axis on the upper surface of the support frame (12). The rotating disk (9) is a circular stepped structure. An eccentric hole is provided on the upper surface of the rotating disk (9). The upper small-diameter ends of the two rotating disks (9) are respectively rotatably embedded in the two rotating disk embedding holes. Two rotating disk pressing plates (10) are respectively provided below the lower large-diameter ends of the two rotating disks (9). Each rotating disk pressing plate (10) is detachably connected to the support frame (12) through a rotating disk pressing plate - support frame connecting piece. The lower ends of the side support rods (7) in the two groups of ventilation models respectively pass through the two eccentric holes, the two rotating disk pressing plates (10), and the tubular gasket (11) from bottom to top and are connected through a side support rod - rotating disk connecting piece.

2. The double-ventilated supercavitation experimental model with continuously adjustable spacing according to claim 1, wherein: The cavitator includes a cavitator head (1) and a cavitator base (2). The front end of the cavitator base (2) is connected to the rear end of the tail support rod (3). A stepped inner cavity is provided at the rear end of the cavitator base (2). The cavitator head (1) includes a front-end cylindrical section and a rear-end frustum section integrally formed with the front-end cylindrical section. The front-end cylindrical section of the cavitator head (1) is embedded in the small-diameter hole section of the stepped inner cavity. A plurality of ventilation micropores are circumferentially distributed on the wall surface of the front-end cylindrical section of the cavitator head (1). The plurality of ventilation micropores are all located in the large-diameter section of the stepped inner cavity of the cavitator base (2).

3. A double-ventilated supercavitation experimental model with continuously adjustable spacing according to claim 2, characterized in that: The number of ventilation micropores on the cavitator head (1) is four. The ventilation diameters of the four ventilation micropores are all 1 mm. The ventilation micropores are 6 mm away from the end face of the cavitator head (1).

4. A double-ventilated supercavitation experimental model with continuously adjustable spacing according to claim 3, characterized in that: Two pressure measurement holes are evenly distributed on the wall surface of the tail support rod (3) and are arranged obliquely.

5. A double-ventilated supercavitation experimental model with continuously adjustable spacing according to claim 4, characterized in that: The diameter of the pressure measurement hole on the tail support rod (3) is 3 mm. The pressure measurement hole is 30 mm away from the front end face of the tail support rod (3). The inclination angle of the pressure measurement hole is 45°.

6. The double-ventilated supercavitation experimental model with continuously adjustable spacing according to claim 5, wherein: The flow-stabilizing component further includes a flow-stabilizing wing (8). The flow-stabilizing wing (8) is of a streamlined structure. A vertically arranged flow-stabilizing wing mounting hole is provided on the upper surface of the flow-stabilizing wing (8). The flow-stabilizing wing (8) is sleeved on the side support rod (7).

7. A double-ventilated supercavitation experimental model with continuously adjustable spacing according to claim 6, characterized in that: The multi-directional connection support system further includes a locking sleeve (4). The front end of the tail support rod (3) is inserted into the inner cavity of the connection port at the front end of the tee connection support rod (5). The outer thread is provided on the side surface of the front end of the tee connection support rod (5). The locking sleeve (4) includes a cylindrical section and a frustum section integrally formed with the cylindrical section. The inner hole of the frustum section of the locking sleeve (4) matches the tail support rod (3). The inner hole of the cylindrical section of the locking sleeve (4) is provided with an internal thread, and the locking sleeve (4) is threadedly connected with the tail support rod (3).

8. A double-ventilated supercavitation experimental model with continuously adjustable spacing according to claim 7, characterized in that: The rotating disk pressing plate - support frame connecting piece is a bolt. The number of the rotating disk pressing plate - support frame connecting bolts is multiple. A plurality of uniformly arranged threaded holes are formed on the lower surface of the support frame (12). A plurality of pressing plate mounting holes are formed on the upper surface of the rotating disk pressing plate (10). The plurality of pressing plate mounting holes respectively correspond to the plurality of threaded holes one by one. The rotating disk pressing plate (10) and the support frame (12) are connected by a plurality of bolts.

9. The double-ventilated supercavitation experimental model with continuously adjustable spacing according to claim 8, characterized in that: The side support rod - rotating disk connecting piece is a nut. The external thread is machined on the lower side surface of the side support rod (7). The nut is installed on the lower threaded section of the side support rod (7). The side support rod (7) and the rotating disk (9) are fixed by tightening the nut.

10. A method for using a double-ventilated supercavitation experimental model with continuously adjustable spacing according to any one of claims 1 to 9, characterized in that: The method is realized by the following means. Before the experiment, the distance between two groups of ventilation models is adjusted. First, the two side support rods (7) are sequentially inserted into the eccentric holes of the two rotating disks (9), the central holes of the rotating disk pressing plates (10), and the tubular gaskets (11) from top to bottom. The two groups of ventilation models are installed on the adjustable - distance base, and then the plurality of bolts on the rotating disk pressing plate (10) are loosened. Then, the two rotating disks (9) are manually rotated respectively, so that the angle of the eccentric hole of each rotating disk (9) changes, and further the distance between the two side support rods (7) changes. Finally, when the angle directions of the two side support rods (7) and the ventilation models reach the predetermined experimental conditions, the plurality of bolts of the rotating disk pressing plate (10) and the nuts below the tubular gasket (11) are tightened to ensure that the rotating disk (9) and the side support rod (7) are fixed and there is no relative sliding between them, so as to realize the fixation of the two groups of ventilation models. During the experiment, first, gas is introduced into the two groups of ventilation models. The gas is sequentially transported to the cavitator head (1) through the inner cavities of the side support rod (7), the tee connection support rod (5), and the tail support rod (3), and it is ensured that the gas only leaks out evenly through the four ventilation micropores on the cavitator head (1). Then, the air flow is led out through the pressure - guiding pipe, and the internal pressure of the cavitation bubble is collected by the pressure sensor, and the flow characteristics are observed by the high - speed camera. Finally, when the predetermined flow conditions are reached, the internal pressure of the cavitation bubble and the flow characteristics are recorded, and thus the first - round experiment is completed. Repeat the above steps for the next - round experiment after each experiment.

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