Internal solitary wave experiment water tank device capable of controlling inclined return

Abstract

The invention discloses an internal solitary wave experiment water tank device capable of controlling inclination and return. The internal solitary wave experiment 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, the inclination angle and the angular speed of the water tank are controlled through a hydraulic system, and background flow is generated through conversion from fluid gravitational potential energy to kinetic energy in the inclination-return process. The blades are driven by the steering engine to open and close synchronously, so that internal solitary waves are generated; simulation of the coupling process of the solitary wave and the background shear flow in different parameters is achieved by adjusting the inclination angle of the water tank, the return speed and the opening and closing time sequence of the blades.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrodynamics, and particularly relates to an experimental water tank device for controllable tilting and righting of internal solitary waves. Background Technique

[0002] Internal waves are large-scale waves occurring inside the ocean. Their amplitude can reach more than 200 meters, the wavelength can reach the kilometer level, and the wave-induced velocity can reach more than 2 m / s. They are an important part of ocean environmental transport. During the propagation process, internal waves will gradually split into a series of individual internal solitary waves. Under the balance of nonlinear characteristics and dispersion characteristics, they can maintain a stable waveform and propagate for thousands of kilometers. They are catastrophic environmental factors that must be considered for ocean structures and submarines. However, in addition to internal waves, there are also a large number of other flow phenomena in the ocean, such as ocean currents, tidal currents, coastal currents, etc. These flows will cause changes in the characteristics of internal solitary waves, and then lead to changes in their impact on ocean structures and submarines. Therefore, revealing the influence of background flow on the characteristics of internal solitary waves has important scientific significance and engineering value.

[0003] At present, the research on internal waves mainly relies on four types of means: on-site observation using equipment such as mooring 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 tests using stratified water tanks, which have advantages such as controllable parameters, strong visualization, and repeatability, and are the core means to verify the accuracy of theories and numerical simulations. In the prior art, the patent with the application number CN201720006660.X proposed 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 the application number CN201710550644.1 proposed an experimental water tank suitable for internal solitary waves and internal waves, which generates internal solitary waves using the gravity collapse method and generates internal waves through the up-and-down periodic motion of a circular box; the patent with the application number CN202011379879.7 proposed an experimental water tank suitable for mono-modal and bi-modal internal solitary waves, which separates the gravity collapse area and the experimental area through a shutter door, reducing the disturbance during the process of removing the partition; the patent with the application number CN202411072111.3 uses a shutter-type gate to generate waves and realizes the transformation of functions through different movement modes of the shutter door. To sum up, existing laboratory devices (such as gravity collapse baffles or wave generators) can generate internal solitary waves, but cannot synchronously form a background flow, resulting in significant differences between experimental conditions and the real ocean environment. Summary of the Invention

[0004] To overcome the deficiencies of the prior art, the present invention provides an experimental water tank device for internal solitary waves with controllable tilting and righting, which includes a tempered glass water tank, a shutter door system, a water tank support, cylindrical pins, a hydraulic system, a connecting rod system, and a control system. By controlling the tilting angle and angular velocity of the water tank through the hydraulic system, and utilizing the conversion of the gravitational potential energy of the fluid to kinetic energy during the tilting-righting process, the generation of the background flow is achieved. By driving the blades to open and close synchronously through a servo motor, the generation of internal solitary waves is realized. By adjusting the tilting angle of the water tank, the righting speed, and the opening and closing timing of the blades, the simulation of the coupling process of internal solitary waves with different parameters and the background shear flow is realized.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0006] An experimental water tank device for internal solitary waves with controllable tilting and righting, which includes a tempered glass water tank, a shutter door system, a water tank support, cylindrical pins, a hydraulic system, a connecting rod system, and a control system;

[0007] The tempered glass water tank includes tempered glass, aluminum alloy profiles, and a wave-absorbing plate. The tempered glass is fixed by the aluminum alloy profiles. Four water inlets are arranged on the tempered glass at the bottom of the tempered glass water tank and are connected to the water inlet and drainage mechanism through pipes for injecting experimental fluids. The wave-absorbing plate is located on the right side inside the tempered glass water tank, and damping holes are evenly distributed on the wave-absorbing plate to generate a hindering effect on the nearby fluid for eliminating internal solitary waves. A hinge seat structure is provided at each of the four corners at the bottom of the tempered glass water tank;

[0008] The shutter door system includes a shutter door support, blade connecting rods, blades, convex structures, a first rope, a second rope, and a servo motor. The shutter door support is installed on the aluminum alloy profiles, and the left side of the shutter door support is the wave-making area. Sealing strips are pasted on both sides of each blade. There are multiple blades, and each blade is installed on the shutter door support through a blade connecting rod, and the blade and the blade connecting rod can rotate synchronously. Two convex structures are installed at the top of each blade connecting rod, and the included angle between the line connecting the two convex structures and the blade is 45°. The servo motor is installed on the shutter door support, and two convex structures are installed on the output shaft of the servo motor. The convex structures on both sides of all the blade connecting rods and the output shaft of the servo motor are respectively connected by the first rope and the second rope;

[0009] The bottom of the water tank support is placed on the ground. Two hinge seat structures are provided in the upper left of the water tank support, which cooperate with the hinge seat structures at the lower left two corners of the tempered glass water tank and form a hinge connection system with the cylindrical pins, enabling the tempered glass water tank to rotate around the cylindrical pin as the rotation center. Multiple hinge seat structures are fixedly provided on the base of the water tank support;

[0010] Multiple cylindrical pins are provided in the experimental water tank device for forming a hinge connection system with other components;

[0011] The hydraulic system includes a cylinder block, a first hinge hole, a first oil inlet, a second oil inlet, a piston rod, a piston, a second hinge hole, a rod chamber, and a rodless chamber; the cylinder block and the first hinge hole are an integral structure, and the hinge hole, the hinge seat structure fixed on the base of the water tank bracket, and the cylindrical pin form a hinge connection system, enabling the hydraulic system to rotate around the cylindrical pin; one end of the piston rod is connected to the piston, and the piston divides the cylinder block into a rod chamber and a rodless chamber; a second oil inlet is provided on the cylinder wall of the rod chamber, and a first oil inlet is provided on the cylinder wall of the rodless chamber; a second hinge hole is provided at the other end of the piston rod; both the first oil inlet and the second oil inlet are connected to the fuel 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, the cylindrical pin, and the hinge seat structure fixed on the base of the water tank bracket form a hinge connection system, enabling the first connecting rod to rotate around the cylindrical pin; 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 form 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 form 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 water tank form a hinge connection system;

[0013] The control system is used to control the hydraulic system and the shutter door system, and set the tilt angle, return speed, and blade opening and closing timing of the tempered glass water tank 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 extends, the connecting rod system pushes the right side of the tempered glass water tank to lift, showing a counterclockwise deflection state; when the piston rod of the hydraulic system shortens, the connecting rod system pulls the right side of the tempered glass water tank to drop, showing a clockwise deflection state.

[0015] Preferably, the tilt angle range of the tempered glass water tank is -15° to 15°, and the maximum return speed is 30° / s. Through the conversion of the gravitational potential energy of the density stratified fluid caused by the tilt-return process of the tempered glass water tank, a background flow with controllable parameters is generated.

[0016] Preferably, when the servo motor rotates clockwise, it pulls the second rope to move, and further pulls all the blade connecting rods and blades to rotate clockwise to realize the opening of the blades; when the servo motor rotates counterclockwise, it pulls the first rope to move, and further pulls all the blade connecting rods and blades to rotate counterclockwise to realize the closing of the blades.

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

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

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

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

[0021] 1. The present invention controls the tilt angle and angular velocity of the water tank through a hydraulic system, and utilizes the conversion of the gravitational potential energy of the fluid to kinetic energy during the tilting - righting process to generate the background flow; the servo motor is used to drive the blades to open and close synchronously to generate internal solitary waves; by adjusting the tilt angle of the water tank, the righting speed and the opening and closing sequence of the blades, the simulation of the coupling process of internal solitary waves with different parameters and the background shear flow is realized.

[0022] 2. The present invention controls the tilt angle of the water tank to be 0 and does not rotate through the hydraulic system, which can be compatible with the internal solitary wave - related experiments under the traditional condition of no background flow.

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

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

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

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

[0027] Figure 4 is the structure diagram of the hydraulic system and the connecting rod system, (a) is the overall structure diagram of the hydraulic system and the connecting rod system, (b) is the hinge structure diagram between the hydraulic system and the connecting rod system, (c) is the hinge connection structure diagram between the connecting rods;

[0028] Figure 5 is the schematic diagram of the tilt angles of three tempered glass water tanks, (a) is the state where the water tank is righted, (b) is the state where the water tank is tilted counterclockwise, (c) is the state where the water tank is tilted clockwise;

[0029] Figure 6Schematic diagram of the opening and closing states of the louver door. (a) shows the louver door in the closed state, and (b) shows the louver door in the open state;

[0030] Figure 7 Schematic diagram of the coupling effect experiment of the embodiment of the present invention. (a) shows the inclined state of the water tank, (b) shows the gravitational potential well generated in the inclined water tank, (c) shows the right-propagating internal solitary wave generated after releasing the gravitational potential well, and (d) shows the waveform after the water tank returns to the upright position.

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

[0032] Marking description in the figure: 1 - tempered glass water tank, 11 - tempered glass, 12 - aluminum alloy profile, 13 - wave dissipating plate, 2 - louver door system, 21 - louver door bracket, 22 - blade connecting rod, 23 - blade, 24 - convex structure, 25 - first rope, 26 - second rope, 27 - servo motor, 3 - water tank bracket, 4 - cylindrical pin, 5 - hydraulic system, 51 - cylinder block, 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 implementation manners

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

[0034] The object of the present invention is to overcome the defect that the existing experimental water tank cannot generate internal solitary waves and background flow synchronously, and provide a controllable tilting and righting internal solitary wave experimental water tank device, which can realize the simulation of wave-flow coupling and wave-flow-fluid multi-field interaction at the laboratory scale, and has the advantages of controllable parameters, convenient operation and compatibility with traditional non-flow experiments.

[0035] As Figure 1 shown, a controllable tilting and righting internal solitary wave experimental water tank device includes a tempered glass water tank 1, a louver 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 toughened glass water tank 1 includes toughened glass 11, aluminum alloy profiles 12, and a wave damping plate 13; the toughened glass 11 is fixed by the aluminum alloy profiles 12; four water inlets are provided on the toughened glass 11 at the bottom of the toughened glass water tank 1 and are connected to the water inlet and drainage mechanism through pipes for injecting experimental fluids; the wave damping plate 13 is located on the right side inside the toughened glass water tank 1, and damping holes are evenly distributed on the wave damping plate 13 to obstruct the nearby fluid and eliminate internal solitary waves; there is a hinge seat structure at each of the four corners at the bottom of the toughened glass water tank 1 for connecting to other systems;

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

[0038] The bottom of the water tank bracket 3 is placed on the ground; As Figure 3 shown, two hinge seat structures are provided in the upper left of the water tank bracket 3, which cooperate with the hinge seat structures at the two lower left corners of the toughened glass water tank 1 and form a hinge connection system with the cylindrical pin 4, enabling the toughened glass water tank 1 to rotate around the cylindrical pin 4 as the rotation center; multiple hinge seat structures are fixedly provided on the base of the water tank bracket 3;

[0039] Multiple cylindrical pins 4 are provided in the experimental water tank device for forming a hinge connection system with other components;

[0040] As Figure 4As shown in the figure, the hydraulic system 5 includes a cylinder block 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 chamber 58 and a rodless chamber 59; the cylinder block 51 and the first hinge hole 52 are an integral structure, and the first hinge hole 52, the hinge seat structure fixed on the base of the water tank bracket 3 and the cylindrical pin 4 form a hinge connection system, enabling the hydraulic system 5 to rotate around the cylindrical pin 4; one end of the piston rod 55 is connected to the piston 56, and the piston 56 divides the cylinder block 51 into two parts: the rod chamber 58 and the rodless chamber 59; the cylinder wall of the rod chamber 58 is provided with the second oil inlet 54, and the cylinder wall of the rodless chamber 59 is provided with the first oil inlet 53; the other end of the piston rod 55 is provided with the second hinge hole 57; both the first oil inlet 53 and the second oil inlet 54 are connected to the fuel 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; one end of the first connecting rod 61 is provided with the third hinge hole 63, and the third hinge hole 63, the cylindrical pin 4 and the hinge seat structure fixed on the base of the water tank bracket 3 form a hinge connection system, enabling the first connecting rod 61 to rotate around the cylindrical pin 4; 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 form a hinge connection system; the other end of the first connecting rod 61 is provided with the fifth hinge hole 65, 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 form a hinge connection system; the other end of the second connecting rod 62 is provided with the seventh hinge hole 67, and the seventh hinge hole 67, the cylindrical pin 4 and the hinge seat structure at the lower right corner of the tempered glass water tank 1 form a hinge connection system;

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

[0043] As Figure 5 shown in (a) of Figure 5 , 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; as Figure 5 shown in (b) of

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

[0045] As Figure 6 shown in (a) and (b) of

[0046] When the steering gear 27 rotates clockwise, it pulls the second rope 26 to move, and further pulls all the blade connecting rods 22 and the blades 23 to rotate clockwise to realize the opening of the blades 23; when the steering gear 27 rotates counterclockwise, it pulls the first rope 25 to move, and further pulls all the blade connecting rods 22 and the blades 23 to rotate counterclockwise to realize the closing of the blades 23.

[0047] The diameter of the damping holes on the wave dissipating plate 13 is 5 mm.

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

[0049] Embodiment:

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

[0051] 1) Adjust the hydraulic system 5 to make the tempered glass water tank 1 in a horizontal state.

[0052] 2) Adjust the steering gear 27 to make the blades 23 in a closed state.

[0053] 3) Inject fresh water (1000 kg / m 3 3) and brine (1000 kg / m 3 3) successively through the water injection port on the tempered glass 11 at the bottom of the tempered glass water tank 1. The volume ratio of fresh water to brine is 1:5.

[0054] 4) Slowly and uniformly inject pressure oil into the rodless cavity 59 from the first oil inlet 53, and at the same time slowly and uniformly extract pressure oil from the rod chamber 58 from the second oil inlet 54 to push the piston rod 55, the piston 56 and the second hinge hole 57 to move outwards, and further push the link system 6 to move, slowly push the tempered glass water tank 1 to a counterclockwise deflection state, and stop when the deflection angle of the tempered glass water tank 1 reaches 10° ( Figure 7 as shown in (a) of

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

[0056] 6) Control the servo 27 to rotate clockwise by 90°, drive all the blades 23 to open, release the gravity collapse area, and form an internal solitary wave propagating to the right ( Figure 7 as shown in (c) of

[0057] ). 7) Rapidly and uniformly extract the pressure oil from the rodless cavity 59 at the first oil inlet 53, and at the same time, rapidly and uniformly inject the pressure oil into the rod cavity 58 at the second oil inlet 54, drive the piston rod 55, the piston 56 and the second hinge hole 57 to move inward, further drive the linkage system 6 to move, and make the toughened glass water tank 1 quickly return to the horizontal state ( Figure 7 as shown in (d) of Figure 8 ); Under the action of gravity, a background flow propagating to the right is formed, and the fluid velocity is as shown in (a) of Figure 8 . The propagation direction of the fluid is the same as that of the internal solitary wave, which is called the positive background flow;

[0058] 8) During the propagation process, the internal solitary wave and the background flow undergo a coupling effect, resulting in changes in the characteristics of the internal solitary wave such as the waveform, manifested as a wider waveform and a smaller wave amplitude. The morphology of the internal solitary wave can be obtained in real time by using fluid dyeing ( Figure 8 as shown in (b) of

[0059] ). In this embodiment, the volume, density, collapse area parameters, water tank tilt angle, pressure oil injection and extraction speed of the light brine, etc. can all be adjusted. The transparent toughened glass water tank is combined with high-precision sensors to support PIV measurement and real-time observation of the flow field. Terrain, structures, etc. can also be installed in the water tank for further research to expand the scope of use.

Claims

1. An experimental water tank device for an internal solitary wave with controllable tilt and self-righting, characterized in that, It includes a tempered 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 tempered glass water tank includes tempered glass, aluminum alloy profiles, and a wave damping plate; the tempered glass is fixed by the aluminum alloy profiles; four water inlets are provided on the tempered glass at the bottom of the tempered glass water tank and are connected to the water inlet and drainage mechanism through pipes for injecting experimental fluids; the wave damping plate is located on the right side inside the tempered glass water tank, and damping holes are evenly distributed on the wave damping plate to generate an obstructive effect on the nearby fluid for eliminating internal solitary waves; hinge seat structures are provided at all four corners of the bottom of the tempered glass water tank; The louver door system includes a louver door support, blade connecting rods, blades, raised structures, a first rope, a second rope, and a servo motor; the louver door support is installed on the aluminum alloy profile, and the left side of the louver door support is the wave-making area; sealing strips are pasted on both sides of the blades, there are multiple blades, and each blade is installed on the louver door support through a blade connecting rod, and the blade and the blade connecting rod can rotate synchronously; two raised structures are installed on the top of each blade connecting rod, and the included angle between the connection line of the two raised structures and the blade is 45°; the servo motor is installed on the louver door support, and two raised structures are installed on the output shaft of the servo motor; the raised structures on both sides of all the blade connecting rods and the output shaft of the servo motor are respectively connected by the first rope and the second rope; The bottom of the water tank support is placed on the ground; two hinge seat structures are provided in the upper left of the water tank support, which cooperate with the hinge seat structures at the lower left two corners of the tempered glass water tank and form a hinge connection system with the cylindrical pin, enabling the tempered glass water tank to rotate with the cylindrical pin as the rotation center; multiple hinge seat structures are fixedly provided on the base of the water tank support; Multiple cylindrical pins are provided in the experimental water tank device for forming a hinge connection system with other components; The hydraulic system includes a cylinder block, a first hinge hole, a first oil inlet, a second oil inlet, a piston rod, a piston, a second hinge hole, a rod chamber, and a rodless chamber; the cylinder block and the first hinge hole are an integral structure, and the hinge hole, the hinge seat structure fixed on the base of the water tank support, and the cylindrical pin form a hinge connection system, enabling the hydraulic system to 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 block into two parts: a rod chamber and a rodless chamber; a second oil inlet is provided on the cylinder wall of the rod chamber, and a first oil inlet is provided on the cylinder wall of the rodless chamber; a second hinge hole is provided at the other end of the piston rod; both the first oil inlet and the second oil inlet are connected to the fuel tank; The link system includes a first link, a second link, 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 link, and the third hinge hole, a cylindrical pin, and a hinge seat structure fixed on the base of the sink bracket form a hinge connection system, enabling the first link to rotate around the cylindrical pin; a fourth hinge hole is provided in the middle of the first link, and the fourth hinge hole, a cylindrical pin, and a second hinge hole form a hinge connection system; a fifth hinge hole is provided at the other end of the first link, and the fifth hinge hole, a cylindrical pin, and a sixth hinge hole provided at one end of the second link form a hinge connection system; a seventh hinge hole is provided at the other end of the second link, and the seventh hinge hole, a cylindrical pin, and a hinge seat structure at the lower right corner of the tempered glass sink form a hinge connection system; The control system is used to control the hydraulic system and the louver door system, and the tilt angle, return speed, and blade opening and closing timing of the tempered glass sink are set through programming.

2. The controllable tilt and self-righting internal solitary wave experimental flume device according to claim 1, wherein, When the piston rod of the hydraulic system is in the middle position, the tempered glass sink is in a horizontal state; when the piston rod of the hydraulic system extends, the link system pushes the right side of the tempered glass sink to lift, showing a counterclockwise deflection state; when the piston rod of the hydraulic system shortens, the link system pulls the right side of the tempered glass sink to drop, showing a clockwise deflection state.

3. The controllable tilt and self-righting internal solitary wave experimental flume device according to claim 1, characterized in that, The tilt angle range of the tempered glass sink is -15° to 15°, and the maximum return speed is 30° / s. Through the conversion of the gravitational potential energy of the density stratified fluid caused by the tilt-return process of the tempered glass sink, a background flow with controllable parameters is generated.

4. A controllable tilt and self-righting internal solitary wave experimental flume device according to claim 1, characterized in that, When the servo motor rotates clockwise, it pulls the second rope to move, and further pulls all the blade connecting rods and blades to rotate clockwise to realize the opening of the blades; when the servo motor rotates counterclockwise, it pulls the first rope to move, and further pulls all the blade connecting rods and blades to rotate counterclockwise to realize the closing of the blades.

5. A controllable tilt and self-righting internal solitary wave experimental flume device according to claim 1, characterized in that, The opening and closing angle of the blades is adjustable from 0° to 90°, the error is less than or equal to 1°, and the blades can be closed and opened within 0.2 seconds at the fastest.

6. The controllable tilt and self-righting internal solitary wave experimental flume device according to claim 1, wherein The diameter of the damping holes on the wave dissipating plate is 10 mm.

7. A controllable tilt and self-righting internal solitary wave experimental flume device according to claim 1, characterized in that, The piston rod and the second hinge hole are of an integral structure.

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