Controllable tilting and rectifying internal solitary wave experimental flume device

Abstract

The application discloses a controllable internal solitary wave experimental water tank device with tilting and righting, which comprises a toughened glass water tank, a louver door system, a water tank support, a cylindrical pin, a hydraulic system, a connecting rod system and a control system; the hydraulic system is used for controlling the tilting angle and angular velocity of the water tank, the generation of background flow is realized by using the conversion of the gravitational potential energy of fluid into kinetic energy during the tilting and righting process; the generation of internal solitary waves is realized by synchronously opening and closing the blades driven by a steering engine; and the simulation of the coupling process of internal solitary waves with different parameters and background shear flow is realized by adjusting the tilting angle of the water tank, the righting speed and the opening and closing timing sequence of the blades.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid mechanics, and in particular relates to an internal solitary wave experimental water tank device with controllable tilt and return function. Background Art

[0002] Internal waves are large-scale fluctuations occurring within the ocean, with amplitudes exceeding 200 meters, wavelengths reaching kilometers, and wave-induced velocities exceeding 2 m / s. They are a crucial component of marine environmental transport. During propagation, internal waves gradually split into a series of individual internal solitary waves. By balancing nonlinear and dispersive properties, these waves can maintain a stable waveform and propagate for thousands of kilometers, presenting a catastrophic environmental risk that must be considered for marine structures and submersibles. However, in addition to internal waves, the ocean also contains numerous other flow phenomena, such as ocean currents, tidal currents, and coastal currents. These flows can alter the characteristics of internal solitary waves, and thus their impact on marine structures and submersibles. Therefore, revealing the influence of background flows on the characteristics of internal solitary waves has important scientific and engineering significance.

[0003] At present, internal wave research mainly relies on four types of methods: field observation using equipment such as buoys and acoustic Doppler current profilers, which has disadvantages such as high cost and poor repeatability; numerical calculation using computational fluid dynamics, which has disadvantages such as high computational cost and insufficient accuracy; analysis using theories such as the Korteweg-de Vries (KdV) equation, which has disadvantages such as too many assumptions and poor applicability; laboratory experiments using stratified water tanks, which have the advantages of controllable parameters, strong visualization, and repeatability, and are the core means to verify the accuracy of theoretical and numerical simulations. In the prior art, the patent with application number CN201720006660.X proposes an experimental water tank based on double push plates, which generates internal solitary waves through the velocity difference of different fluid layers; the patent with application number CN201710550644.1 proposes an experimental water tank suitable for internal solitary waves and internal waves, which uses the gravity collapse method to generate internal solitary waves, and generates internal waves through the up and down periodic movement of a circular box; the patent with application number CN202011379879.7 proposes an experimental water tank suitable for one-mode and two-mode internal solitary waves, which separates the gravity collapse area and the experimental area through a louver door, reducing the disturbance during the partition removal process; the patent with application number CN202411072111.3 uses a louver gate to generate waves, and realizes the functional transformation through different movement modes of the louver door. In summary, existing laboratory devices (such as gravity collapse baffles or wave generators) can generate internal solitary waves, but cannot synchronously form background flows, resulting in significant differences between experimental conditions and real ocean environments. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the present invention provides an internal solitary wave experimental water tank device with controllable tilt and return, including a tempered glass water tank, a shutter door system, a water tank bracket, a cylindrical pin, a hydraulic system, a connecting rod system and a control system; the hydraulic system controls the tilt angle and angular velocity of the water tank, and utilizes the conversion of fluid gravitational potential energy into kinetic energy during the tilt-return process to achieve the generation of background flow; the steering gear drives the blades to open and close synchronously to achieve the generation of internal solitary waves; and the adjustment of the water tank tilt angle, return speed and blade opening and closing timing is utilized to achieve the simulation of the coupling process of internal solitary waves and background shear flow with different parameters.

[0005] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0006] A controllable tilt and return internal solitary wave experimental water tank device comprises a tempered glass water tank, a shutter door system, a water tank bracket, a cylindrical pin, a hydraulic system, a connecting rod system and a control system;

[0007] The tempered glass water tank comprises tempered glass, an aluminum alloy profile, and a wave-breaking plate; the tempered glass is fixed by the aluminum alloy profile; four water inlets are provided on the tempered glass at the bottom of the tempered glass water tank, connected to the inlet and outlet mechanism via pipes for injecting experimental fluid; the wave-breaking plate is located on the right side of the tempered glass water tank, and damping holes are evenly distributed on the wave-breaking plate to produce an obstruction effect on the nearby fluid, thereby eliminating internal solitary waves; a hinge seat structure is provided at each of the four corners of the bottom of the tempered glass water tank;

[0008] The louver door system includes a louver door bracket, a blade connecting rod, a blade, a raised structure, a first rope, a second rope, and a steering gear; the louver door bracket is mounted on an aluminum alloy profile, and the left side of the louver door bracket is a wave-making area; sealing strips are affixed to both sides of the blade, and there are multiple blades, each of which is mounted to the louver door bracket via a blade connecting rod, and the blade and the blade connecting rod can rotate synchronously; two raised structures are mounted on the top of each blade connecting rod, and the angle between the connecting line of the two raised structures and the blade is 45 degrees; the steering gear is mounted on the louver door bracket, and two raised structures are mounted on the output shaft of the steering gear; the two sides of the raised structures on all blade connecting rods and the steering gear output shaft are respectively connected by a first rope and a second rope;

[0009] The bottom of the sink bracket is placed on the ground; two hinge seat structures are set on the upper left of the sink bracket, which cooperate with the hinge seat structures at the two corners of the lower left of the tempered glass sink, and then form a hinge connection system with the cylindrical pin, so that the tempered glass sink can rotate with the cylindrical pin as the rotation center; multiple hinge seat structures are fixed on the base of the sink bracket;

[0010] The cylindrical pins are provided in plurality in the experimental water tank device and are used to form a hinge connection system with other components;

[0011] The hydraulic system includes a cylinder body, a first hinge hole, a first oil inlet, a second oil inlet, a piston rod, a piston, a second hinge hole, a rod cavity and a rodless cavity; the cylinder body and the first hinge hole are an integrated structure, and the hinge hole and a hinge seat structure fixed to the base of the sink bracket and a cylindrical pin constitute a hinge connection system, so that the hydraulic system can rotate with the cylindrical pin as the rotation center; one end of the piston rod is connected to the piston, and the piston divides the cylinder body into two parts, a rod cavity and a rodless cavity; the cylinder wall of the rod cavity is provided with a second oil inlet, and the cylinder wall of the rodless cavity is provided with a first oil inlet; the other end of the piston rod is provided with a second hinge hole; the first oil inlet and the second oil inlet are both connected to the oil tank;

[0012] The connecting rod system includes a first connecting rod, a second connecting rod, a third hinge hole, a fourth hinge hole, a fifth hinge hole, a sixth hinge hole and a seventh hinge hole; a third hinge hole is provided at one end of the first connecting rod, and the third hinge hole, a cylindrical pin and a hinge seat structure fixed to the base of the sink bracket constitute a hinge connection system, so that the first connecting rod can rotate with the cylindrical pin as the rotation center; a fourth hinge hole is provided in the middle of the first connecting rod, and the fourth hinge hole, the cylindrical pin and the second hinge hole constitute a hinge connection system; a fifth hinge hole is provided at the other end of the first connecting rod, and the fifth hinge hole, the cylindrical pin and the sixth hinge hole provided at one end of the second connecting rod constitute a hinge connection system; a seventh hinge hole is provided at the other end of the second connecting rod, and the seventh hinge hole, the cylindrical pin and the hinge seat structure at the lower right corner of the tempered glass sink constitute a hinge connection system;

[0013] The control system is used to control the hydraulic system and the shutter door system, and the tilt angle, return speed and blade opening and closing timing of the tempered glass water tank are set through programming.

[0014] Preferably, when the piston rod of the hydraulic system is in the middle position, the tempered glass water tank is in a horizontal state; when the piston rod of the hydraulic system is extended, the connecting rod system pushes the right side of the tempered glass water tank to lift up, and it is in a counterclockwise deflection state; when the piston rod of the hydraulic system is shortened, the connecting rod system pulls the right side of the tempered glass water tank down, and it is in a clockwise deflection state.

[0015] Preferably, the tilt angle range of the tempered glass water tank is -15°~15°, and the maximum return speed is 30° / s. The tilt-return process of the tempered glass water tank triggers the conversion of gravitational potential energy of the density stratified fluid to generate a parameter-controllable background flow.

[0016] Preferably, when the servo rotates clockwise, the second rope is pulled to move, further pulling all the blade connecting rods and the blades to rotate clockwise to achieve the opening of the blades; when the servo rotates counterclockwise, the first rope is pulled to move, further pulling all the blade connecting rods and the blades to rotate counterclockwise to achieve the closing of the blades.

[0017] Preferably, the blade opening and closing angle is adjustable from 0° to 90°, with an error of less than or equal to 1°, and the blade can be closed and opened within 0.2 seconds at the fastest.

[0018] Preferably, the diameter of the damping hole on the wave-breaking plate is 10 mm.

[0019] Preferably, the piston rod and the second hinge hole are an integral structure.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The present invention controls the inclination angle and angular velocity of the water tank through a hydraulic system, and utilizes the conversion of the fluid's gravitational potential energy into kinetic energy during the tilt-and-reset process to generate background flow. The servo drives the blades to open and close synchronously to generate internal solitary waves. Adjusting the water tank's inclination angle, return velocity, and blade opening and closing timing allows simulation of the coupling process between internal solitary waves and background shear flow with different parameters.

[0022] 2. The present invention controls the water tank's tilt angle to 0 and does not rotate through a hydraulic system, which is compatible with traditional internal solitary wave related experiments in the absence of background flow.

[0023] 3. The present invention uses a hydraulic system to control the water tank's tilt angle to be non-zero but not to rotate. The bottom of the water tank can be regarded as a gentle slope terrain at different angles, which is used to study the climbing or descending process of internal solitary waves. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the overall structural diagram of the present invention;

[0025] Figure 2 The structure diagram of the shutter door system, (a) is the overall diagram of the shutter door system, (b) is the structure diagram of the blade connecting rod, (c) is the top view of the shutter door blade in the closed state, and (d) is the top view of the shutter door blade in the open state;

[0026] Figure 3 It is the structural diagram of the hinge connection system;

[0027] Figure 4 The structural diagrams of the hydraulic system and the connecting rod system are shown in Figure 2. (a) is the overall structural diagram of the hydraulic system and the connecting rod system, (b) is the hinge structural diagram between the hydraulic system and the connecting rod system, and (c) is the hinge connection structural diagram between the connecting rods.

[0028] Figure 5 Schematic diagram of three types of tempered glass sink tilt angles: (a) shows the sink in the normal position, (b) shows the sink tilted counterclockwise, and (c) shows the sink tilted clockwise.

[0029] Figure 6Schematic diagram of the shutter door opening and closing states, (a) is the shutter door closed state, (b) is the shutter door open state;

[0030] Figure 7 Schematic diagram of the coupling experiment of an embodiment of the present invention, (a) shows the tilted state of the water tank, (b) shows the gravity potential well generated in the tilted water tank, (c) shows the rightward propagating internal solitary wave generated after the gravity potential well is released, and (d) shows the waveform after the water tank returns to the normal position.

[0031] Figure 8 Result diagram of an embodiment of the present invention, (a) is the horizontal velocity of the background flow, and (b) is the comparison of the internal solitary wave waveform with and without the background flow.

[0032] Explanation of the marks in the figure: 1-tempered glass water tank, 11-tempered glass, 12-aluminum alloy profile, 13-wave-breaking plate, 2-louver door system, 21-louver door bracket, 22-blade connecting rod, 23-blade, 24-raised structure, 25-first rope, 26-second rope, 27-servo engine, 3-water tank bracket, 4-cylindrical pin, 5-hydraulic system, 51-cylinder body, 52-first hinge hole, 53-first oil inlet, 54-second oil inlet, 55-piston rod, 56-piston, 57-second hinge hole, 58-rod chamber, 59-rodless chamber, 6-connecting rod system, 61-first connecting rod, 62-second connecting rod, 63-third hinge hole, 64-fourth hinge hole, 65-fifth hinge hole, 66-sixth hinge hole, 67-seventh hinge hole, 7-control system. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings and examples.

[0034] The purpose of the present invention is to overcome the defect that the existing experimental water tank cannot synchronously generate internal solitary waves and background flows, and to provide an internal solitary wave experimental water tank device with controllable tilt and return, which can realize the simulation of wave-flow coupling and wave-flow-body multi-field effects at the laboratory scale, and has the advantages of parameter controllability, convenient operation and compatibility with traditional flowless experiments.

[0035] like Figure 1 As shown, a controllable tilt and return internal solitary wave experimental water tank device includes a tempered glass water tank 1, a shutter door system 2, a water tank bracket 3, a cylindrical pin 4, a hydraulic system 5, a connecting rod system 6 and a control system 7;

[0036] The tempered glass water tank 1 includes a tempered glass 11, an aluminum alloy profile 12, and a wave-breaking plate 13; the tempered glass 11 is fixed by the aluminum alloy profile 12; four water inlets are provided on the tempered glass 11 at the bottom of the tempered glass water tank 1, which are connected to the water inlet and outlet mechanism via pipes for injecting experimental fluid; the wave-breaking plate 13 is located on the right side of the interior of the tempered glass water tank 1, and damping holes are evenly distributed on the wave-breaking plate 13 to produce an obstruction effect on the nearby fluid and to eliminate internal solitary waves; the four corners of the bottom of the tempered glass water tank 1 each have a hinge seat structure for connecting to other systems;

[0037] like Figure 2 As shown, the shutter door system 2 includes a shutter door bracket 21, a blade connecting rod 22, a blade 23, a protruding structure 24, a first rope 25, a second rope 26 and a steering gear 27; the shutter door bracket 21 is mounted on the aluminum alloy profile 12, and the left side of the shutter door bracket 21 is a wave-making area; sealing strips are affixed to both sides of the blade 23, and there are multiple blades 23, each of which is mounted on the shutter door bracket 21 through a blade connecting rod 22, and the blade 23 and the blade connecting rod 22 can rotate synchronously; two protruding structures 24 are mounted on the top of each blade connecting rod 22, and the angle between the connecting line of the two protruding structures 24 and the blade 23 is 45 degrees; the steering gear 27 is mounted on the shutter door bracket 21, and two protruding structures 24 are mounted on the output shaft of the steering gear 27; the two sides of the protruding structures 24 on all the blade connecting rods 22 and the output shaft of the steering gear 27 are connected by a first rope 25 and a second rope 26 respectively;

[0038] The bottom of the water tank bracket 3 is placed on the ground; Figure 3 As shown, two hinge seat structures are set on the upper left of the sink bracket 3, which cooperate with the hinge seat structures at the two lower left corners of the tempered glass sink 1, and then form a hinge connection system with the cylindrical pin 4, so that the tempered glass sink 1 can rotate with the cylindrical pin 4 as the rotation center; multiple hinge seat structures are fixed on the base of the sink bracket 3;

[0039] The cylindrical pins 4 are provided in plurality in the experimental water tank device, and are used to form a hinge connection system with other components;

[0040] like Figure 4As shown, the hydraulic system 5 includes a cylinder body 51, a first hinge hole 52, a first oil inlet 53, a second oil inlet 54, a piston rod 55, a piston 56, a second hinge hole 57, a rod cavity 58 and a rodless cavity 59; the cylinder body 51 and the first hinge hole 52 are an integral structure, and the first hinge hole 52 and the hinge seat structure fixed to the base of the sink bracket 3 and the cylindrical pin 4 constitute a hinge connection system, so that the hydraulic system 5 can rotate with the cylindrical pin 4 as the rotation center; one end of the piston rod 55 is connected to the piston 56, and the piston 56 divides the cylinder body 51 into two parts, a rod cavity 58 and a rodless cavity 59; the cylinder wall of the rod cavity 58 is provided with a second oil inlet 54, and the cylinder wall of the rodless cavity 59 is provided with a first oil inlet 53; the other end of the piston rod 55 is provided with a second hinge hole 57; the first oil inlet 53 and the second oil inlet 54 are both connected to the oil tank;

[0041] The connecting rod system 6 includes a first connecting rod 61, a second connecting rod 62, a third hinge hole 63, a fourth hinge hole 64, a fifth hinge hole 65, a sixth hinge hole 66 and a seventh hinge hole 67; a third hinge hole 63 is provided at one end of the first connecting rod 61, and the third hinge hole 63, the cylindrical pin 4 and the hinge seat structure fixed to the base of the sink bracket 3 constitute a hinge connection system, so that the first connecting rod 61 can rotate with the cylindrical pin 4 as the rotation center; a fourth hinge hole 64 is provided in the middle of the first connecting rod 61, and the fourth hinge hole 64, the cylindrical pin 4 and the second hinge hole 57 constitute a hinge connection system; a fifth hinge hole 65 is provided at the other end of the first connecting rod 61, and the fifth hinge hole 65, the cylindrical pin 4 and the sixth hinge hole 66 provided at one end of the second connecting rod 62 constitute a hinge connection system; a seventh hinge hole 67 is provided at the other end of the second connecting rod 62, and the seventh hinge hole 67, the cylindrical pin 4 and the hinge seat structure at the lower right corner of the tempered glass sink 1 constitute a hinge connection system;

[0042] The control system 7 is used to control the hydraulic system and the shutter door system, and the tilt angle, return speed and blade opening and closing timing of the tempered glass water tank 1 are set through programming.

[0043] like Figure 5 As shown in (a), when the piston rod 55 of the hydraulic system 5 is in the middle position, the tempered glass water tank 1 is in a horizontal state; Figure 5 As shown in (b), when the piston rod 55 of the hydraulic system 5 is extended, the connecting rod system 6 pushes the right side of the tempered glass water tank 1 to rise, and the water tank is deflected counterclockwise; Figure 5 As shown in (c), when the piston rod 55 of the hydraulic system 5 is shortened, the connecting rod system 6 pulls the right side of the tempered glass water tank 1 to fall, and is in a clockwise deflection state.

[0044] The tilt angle range of the tempered glass water tank 1 is -15° to 15°, and the maximum return speed is 30° / s. The tilt-return process of the tempered glass water tank 1 triggers the conversion of gravitational potential energy of the density stratified fluid to generate a parameter-controllable background flow.

[0045] like Figure 6 As shown in (a) and (b), when the servo 27 rotates clockwise, it pulls the second rope 26 to move, further pulling all the blade connecting rods 22 and the blades 23 to rotate clockwise, thereby opening the blades 23; when the servo 27 rotates counterclockwise, it pulls the first rope 25 to move, further pulling all the blade connecting rods 22 and the blades 23 to rotate counterclockwise, thereby closing the blades 23.

[0046] The opening and closing angle of the blade 23 is adjustable from 0° to 90°, with an error of less than or equal to 1°, and the closing and opening of the blade 23 can be completed within 0.2 seconds at the fastest.

[0047] The diameter of the damping hole on the wave-breaking plate 13 is 5 mm.

[0048] The piston rod 55 and the second hinge hole 57 are an integral structure.

[0049] Example:

[0050] Experiment on the coupling effect between positive background flow and internal solitary wave using the device of the present invention:

[0051] 1) Adjust the hydraulic system 5 so that the tempered glass water tank 1 is in a horizontal state.

[0052] 2) Adjust the steering gear 27 so that the blade 23 is in the closed state.

[0053] 3) Fresh water (1000kg / m 3 ) and salt water (1000kg / m 3 ), the volume ratio of fresh water to salt water is 1:5.

[0054] 4) Slowly and evenly inject pressurized oil into the rodless chamber 59 from the first oil inlet 53, and at the same time slowly and evenly pump out pressurized oil from the rod chamber 58 from the second oil inlet 54, pushing the piston rod 55, piston 56 and second hinge hole 57 outward, further pushing the connecting rod system 6 to move, slowly pushing the tempered glass water tank 1 to a counterclockwise deflection state, and stopping when the deflection angle of the tempered glass water tank 1 reaches 10° ( Figure 7 (a) in the figure.

[0055] 5) Slowly inject fresh water into the upper surface of the left area of ​​the shutter door system 2 to form a gravity collapse area ( Figure 7 (b) in the figure).

[0056] 6) Control the steering gear 27 to rotate 90° clockwise, driving all blades 23 to open, releasing the gravity collapse area, and forming an internal solitary wave propagating to the right ( Figure 7 (c) in the figure).

[0057] 7) The pressure oil is quickly and evenly extracted from the rodless cavity 59 through the first oil inlet 53, and at the same time, the pressure oil is quickly and evenly injected into the rod cavity 58 through the second oil inlet 54, driving the piston rod 55, the piston 56 and the second hinge hole 57 to move inward, further driving the connecting rod system 6 to move, so that the tempered glass water tank 1 quickly returns to a horizontal state ( Figure 7 (d) in the figure); Under the action of gravity, a background flow propagating to the right is formed, and the fluid velocity is as follows: Figure 8 As shown in (a), the propagation direction of the fluid is consistent with the propagation direction of the internal solitary wave, which is called the positive background flow;

[0058] 8) During the propagation process, the internal solitary wave couples with the background flow, causing the waveform and other characteristics of the internal solitary wave to change, which is manifested as a wider waveform and smaller amplitude. The shape of the internal solitary wave can be obtained in real time by using fluid coloring ( Figure 8 (b) in the figure).

[0059] In this embodiment, the volume, density, collapse zone parameters, tank tilt angle, and pressure oil injection and withdrawal rates of the saltwater can all be adjusted. The transparent tempered glass tank, combined with high-precision sensors, supports flow field PIV measurement and real-time observation. Terrain and structures can also be installed within the tank for further research, expanding its scope of application.

Claims

1. A water tank device for internal solitary wave experiment with controllable tilt and return, characterized in that: Including water tank, shutter door system, water tank bracket, cylindrical pin, hydraulic system, connecting rod system and control system; The water tank includes tempered glass and a wave-breaking plate; four water inlets are provided on the tempered glass at the bottom of the water tank; the wave-breaking plate is located on the right side of the water tank, and damping holes are evenly distributed on the wave-breaking plate; The louver door system includes a louver door bracket, a blade connecting rod, a blade, a raised structure, a first rope, a second rope, and a steering gear; the louver door bracket is mounted on an aluminum alloy profile, with a wave-generating area on the left side of the louver door bracket; each blade is mounted on the louver door bracket via a blade connecting rod, and the blade and blade connecting rod are capable of synchronous rotation; two raised structures are mounted on the top of each blade connecting rod; the steering gear is mounted on the louver door bracket, and two raised structures are mounted on the output shaft of the steering gear; both sides of the raised structures on all blade connecting rods and the steering gear output shaft are connected by a first rope and a second rope, respectively; Two hinge seat structures are set on the upper left of the sink bracket, which cooperate with the hinge seat structures at the two corners of the lower left of the sink, and then form a hinge connection system with the cylindrical pin, so that the sink can rotate with the cylindrical pin as the rotation center; The hydraulic system includes a cylinder body, a first hinge hole, a first oil inlet, a second oil inlet, a piston rod, a piston, and a second hinge hole; the hinge hole and a hinge seat structure fixed to the base of the water tank bracket and a cylindrical pin constitute a hinge connection system, so that the hydraulic system can rotate with the cylindrical pin as the rotation center; one end of the piston rod is connected to the piston, and the piston divides the cylinder body into two parts: a rod chamber and a rodless chamber; the second oil inlet is provided on the cylinder wall of the rod chamber, and the first oil inlet is provided on the cylinder wall of the rodless chamber; the second hinge hole is provided on the other end of the piston rod; The connecting rod system includes a first connecting rod, a second connecting rod, a third hinge hole, a fourth hinge hole, a fifth hinge hole, a sixth hinge hole and a seventh hinge hole; a third hinge hole is provided at one end of the first connecting rod, and the third hinge hole, a cylindrical pin and a hinge seat structure fixed to the base of the sink bracket constitute a hinge connection system, so that the first connecting rod can rotate with the cylindrical pin as the rotation center; a fourth hinge hole is provided in the middle of the first connecting rod, and the fourth hinge hole, the cylindrical pin and the second hinge hole constitute a hinge connection system; a fifth hinge hole is provided at the other end of the first connecting rod, and the fifth hinge hole, the cylindrical pin and the sixth hinge hole provided at one end of the second connecting rod constitute a hinge connection system; a seventh hinge hole is provided at the other end of the second connecting rod, and the seventh hinge hole, the cylindrical pin and the hinge seat structure at the lower right corner of the sink constitute a hinge connection system; The control system is used to control the hydraulic system and the shutter door system, and to set the tilt angle and return speed of the water tank and the opening and closing timing of the blades of the shutter door system.

2. The internal solitary wave experimental water tank device with controllable tilt and return to normal position according to claim 1 is characterized in that: When the piston rod of the hydraulic system is in the middle position, the water tank is in a horizontal state; when the piston rod of the hydraulic system is extended, the connecting rod system pushes the right side of the water tank to lift up, and it is in a counterclockwise deflection state; when the piston rod of the hydraulic system is shortened, the connecting rod system pulls the right side of the water tank down, and it is in a clockwise deflection state.

3. The internal solitary wave experimental water tank device with controllable tilt and return to normal position according to claim 1 is characterized in that: The tilt angle range of the water tank is -15° to 15°, and the maximum return speed is 30° / s. The gravitational potential energy conversion of the density stratified fluid is triggered by the tilt-return process of the water tank to generate a parameter-controllable background flow.

4. The internal solitary wave experimental water tank device with controllable tilt and return to normal position according to claim 1 is characterized in that: When the steering engine rotates clockwise, the second rope is pulled to move, and further all the blade connecting rods and blades are pulled to rotate clockwise to open the blades; when the steering engine rotates counterclockwise, the first rope is pulled to move, and further all the blade connecting rods and blades are pulled to rotate counterclockwise to close the blades.

5. The internal solitary wave experimental water tank device with controllable tilt and return to normal position according to claim 1 is characterized in that: The blade opening and closing angle is adjustable from 0° to 90°, with an error of less than or equal to 1°, and the blade can be closed and opened within 0.2 seconds at the fastest.

6. The internal solitary wave experimental water tank device with controllable tilt and return to normal position according to claim 1 is characterized in that: The diameter of the damping hole on the wave-breaking plate is 10 mm.

7. The internal solitary wave experimental water tank device with controllable tilt and return to normal position according to claim 1 is characterized in that: The piston rod and the second hinge hole are an integrated structure.

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