An internal wave experiment device and method

Abstract

An internal wave experiment device and method of the present invention belong to the technical field of ocean internal wave simulation; it includes a brine tank, a fresh water tank and a water tank, and the three are connected by pipelines; a pipeline booster pump, a throttle valve and a flowmeter are arranged on the pipeline between the brine tank and the fresh water tank for adjusting and monitoring the flow rate of the brine flowing from the brine tank into the fresh water tank; a throttle valve and a flowmeter are arranged on the pipeline between the fresh water tank and the water inlet at the bottom of the water tank for adjusting and monitoring the flow rate of the mixed brine flowing from the fresh water tank into the water tank; gate valves are arranged on the pipelines between the top opening of the fresh water tank and the water tank and the water inlet at the bottom of the water tank for controlling the on-off of the mixed brine in the fresh water tank. By controlling the gate valves, throttle valves and pipeline booster pumps arranged on each connecting pipeline, the present invention can not only produce continuous stratified fluid, but also produce strongly stratified fluid with any thickness, eliminating the limitation that it is difficult to produce different stratified fluid thicknesses in the same device in the drawplate method.

Description

Technical Field

[0001] The present invention belongs to the technical field of ocean internal wave simulation, and particularly relates to an internal wave experimental device and method. Background Art

[0002] Ocean internal waves are waves generated in a stably stratified ocean with the maximum amplitude occurring inside the ocean, and are a wave phenomenon that almost penetrates the entire depth of the ocean. Generally, there are density or temperature differences in the seawater in the gravity direction, which is due to the perennial heating of the ocean by solar radiation. The solar radiation energy enters the ocean through the ocean surface, causing the surface water body of the ocean to be directly heated by solar radiation, and the underlying water body is little affected by solar radiation. When the temperature of the surface water body of the ocean rises due to solar radiation, the density decreases accordingly. The perennial action of solar radiation makes the entire ocean form a stratification structure with increasing density from the surface to the bottom layer. In an ocean with a stable stratification structure, when an external force disturbance destroys this stratification structure, internal waves may be generated. Ocean internal waves will cause large-amplitude vertical fluctuations inside the ocean. Large-amplitude internal solitary waves carry huge energy and will cause sudden strong currents (wave-induced currents) and significant amplitude convergence and divergence during propagation, causing the seawater above and below the pycnocline to shear flow. Therefore, it poses a major threat to ocean engineering structures, especially submerged structures spanning the pycnocline. Since ocean internal waves are three-dimensional waves inside the ocean, and remote sensing observations can only obtain some characteristics of internal waves at the ocean surface, there are certain limitations to the entire evolution process. Therefore, it is quite necessary to carry out experimental research to explore the generation and evolution mechanisms. Two necessary conditions for the generation of internal waves are a stably stratified ocean structure and the existence of a disturbance source. Therefore, the basis for conducting internal wave experiments is to first prepare the stratified fluid required for the experiment. Currently, most physical experiments use the double-cylinder method to prepare stratified fluid. The double-cylinder method can obtain a uniformly stratified fluid with a linearly varying density with depth and a strongly stratified fluid with different densities in the upper and lower layers, but there are still some deficiencies. The traditional double-cylinder method cannot prepare a fluid with an arbitrary density profile according to requirements. In addition, when preparing a strongly stratified fluid in the upper and lower layers, due to large disturbances, the fluid mixing (molecular diffusion) is relatively obvious.

[0003] At present, in the prior art, the opening degree of an electric valve is adjusted by PID to control the flow rates of brine and fresh water, a booster pump is set, and stirring is carried out in a mixer to achieve an ideal density profile. It is necessary to control the opening degrees of two electric valves simultaneously, which is not easy to control, and there is a large disturbance when preparing a strongly stratified fluid. There is an opening and closing mechanism with a telescopic function set at the water injection port. By manually controlling the telescopic angle of the opening and closing mechanism, the flow rate and direction of brine flowing into the water tank are changed, so that the impact effect of brine on water is different, thereby forming a mixed layer with different concentration gradients. However, the opening and closing structure will cause a large disturbance to the fluid in the water tank during the telescopic process and when brine impacts water, causing molecular diffusion between the upper clear water and brine, and it is difficult to control when generating the required density profile. There is also the preparation of stratified fluid based on the drawplate method. Its stratified water tank consists of an experimental water tank and an auxiliary water tank, which are separated by a partition plate. Different concentration stratified fluids are prepared by moving the baffle in the experimental water tank. However, it is difficult to prepare stratified fluids with different heights. When the height changes, a new stratified water tank needs to be replaced, and continuous stratified fluid cannot be prepared. In addition, the experimental space required is large. Summary of the Invention

[0004] Technical problems to be solved:

[0005] In order to avoid the deficiencies of the prior art, the present invention provides an internal wave experimental device, which is an internal wave experimental device with the functions of preparing strongly stratified and continuously stratified fluids. The double-cylinder method can be used to prepare fluids with any density profile; continuous stratified fluids and strongly stratified fluids with any thickness can be prepared by an integrated device, solving the limitation in the prior art drawplate method that it is difficult to prepare stratified fluids with different thicknesses in the same device.

[0006] The technical solution of the present invention is: an internal wave experimental device, characterized in that: it includes a brine tank, a fresh water tank and a water tank, and the three are connected by pipelines; the water tank is used for storing stratified fluids;

[0007] A pipeline booster pump, a throttle valve and a flow meter are arranged in the pipeline between the brine tank and the fresh water tank, for adjusting and monitoring the flow rate of brine flowing from the brine tank into the fresh water tank;

[0008] A throttle valve and a flow meter are arranged in the pipeline between the fresh water tank and the water inlet at the bottom of the water tank, for adjusting and monitoring the flow rate of the mixed brine flowing from the fresh water tank into the water tank;

[0009] Gate valves are arranged in the pipelines between the top opening of the fresh water tank and the water inlet at the bottom of the water tank, for controlling the on-off of the mixed brine in the fresh water tank.

[0010] A further technical solution of the present invention is that: the water outlet of the pipeline where the clear water tank extends to the top opening of the water tank is an expanded water outlet, which increases the contact area between the water outlet and the floating body block, effectively reduces the impact of the water outlet on the floating body block, and further reduces the disturbance caused when preparing the strongly stratified fluid.

[0011] A further technical solution of the present invention is that: it further includes a floating body block, which is located on the liquid surface in the water tank and is opposite to the water outlet of the pipeline where the clear water tank extends to the top opening of the water tank, so that after the water flow in the clear water tank flows onto the floating body block, it overflows from the periphery of the floating body block onto the fluid in the water tank, reducing the disturbance to the fluid in the water tank.

[0012] A further technical solution of the present invention is that: the water inlet at the bottom end of the water tank is mushroom-shaped, which increases the water outlet area.

[0013] A further technical solution of the present invention is that: a stirrer is arranged in the clear water tank for uniformly mixing the high-concentration brine in the brine tank and the clear water in the clear water tank.

[0014] A further technical solution of the present invention is that: a branch pipeline is arranged on the pipeline between the clear water tank and the water inlet at the bottom end of the water tank, and a gate valve is installed; the branch pipeline is used to release the stratified fluid that is not needed after the experiment, and the on-off of the fluid in the branch pipeline is controlled by the gate valve.

[0015] A further technical solution of the present invention is that: the heights of the brine tank and the clear water tank are higher than the height of the water tank.

[0016] A method for preparing a continuous stratified fluid with an arbitrary density profile, characterized in that the specific steps are as follows:

[0017] Step 1: Close all gate valves;

[0018] Step 2: Inject the prepared high-concentration brine and clear water into the brine tank and the clear water tank respectively;

[0019] Step 3: Connect the pipeline booster pump to make the pressure on the brine tank side higher than the water pressure of the clear water tank;

[0020] Step 4: After the high-concentration brine flows into the clear water tank, it is mixed evenly;

[0021] Step 5: Open the gate valve between the clear water tank and the water inlet at the bottom end of the water tank, and adjust the two throttle valves respectively to make the flow rate of the high-concentration brine from the brine tank to the clear water tank be q, and the flow rate of the mixed brine from the clear water tank to the water tank be Q;

[0022] Step 6: When the prepared stratified fluid reaches the specified height, close the pipeline booster pump and the gate valve between the clear water tank and the water inlet at the bottom end of the water tank, and the work is completed.

[0023] A method for preparing a strongly stratified fluid, characterized in that the specific steps are as follows:

[0024] Step 1: Close the pipeline booster pump, all gate valves, and the throttle valve between the brine tank and the clear water tank;

[0025] Step 2: Prepare brine with a set density in the clear water tank and mix it evenly;

[0026] Step 3: Open the gate valve between the clear water tank and the water inlet at the bottom of the water tank, and adjust the throttle valve between the clear water tank and the water inlet at the bottom of the water tank to its maximum opening, so that the prepared brine in the clear water tank can be quickly injected into the water tank;

[0027] Step 4: When the lower-layer fluid is injected to the specified height, close the gate valve between the clear water tank and the water inlet at the bottom of the water tank;

[0028] Step 5: Drain the remaining brine in the pipeline and clean the clear water tank;

[0029] Step 6: Inject clear water with a set density into the clear water tank and place the floating body block into the water tank;

[0030] Step 7: Open the gate valve of the pipeline between the clear water tank and the opening at the top of the water tank, so that there is a certain distance between the expanding water outlet and the floating body block, and it is directly opposite to the middle part of the floating body block to prevent the floating body block from tilting; when the water flows onto the floating body block, it overflows from the four sides of the floating body block onto the lower-layer fluid, reducing the disturbance to the lower-layer fluid;

[0031] Step 8: When the upper-layer fluid reaches the specified height, close the gate valve of the pipeline between the clear water tank and the opening at the top of the water tank, and take out the floating body block, and the preparation of the strongly stratified fluid is completed.

[0032] A further technical solution of the present invention is that the pipeline between the clear water tank and the opening at the top of the water tank can adopt a flexible hose.

[0033] Beneficial effects

[0034] The beneficial effects of the present invention are as follows:

[0035] 1. Based on the double-cylinder method, the present invention adds equipment such as a pipeline booster pump and a throttle valve, can prepare fluids with any density profile, and is easy to operate; the pipeline booster pump can increase the water pressure on the side of the high-concentration brine tank, so that the flow rate flowing into the clear water tank can be adjusted as required; a flow meter is respectively arranged between the brine tank and the clear water tank, and between the clear water tank and the water tank, which can respectively monitor the brine flow rate flowing into the clear water tank and the water tank, and formulate the indicators of any density profile according to the monitoring data.

[0036] 2. Design the water outlet of the pipeline between the water tank and the top inlet of the water trough as an expanding shape to increase the contact area between the water outlet and the floating body block, effectively reducing the impact of the water outlet on the floating body block, thereby reducing the disturbance caused when producing a strongly stratified fluid; and set a floating body block on the water surface below the expanding water outlet to replace the baffle between different layers of fluid in the drawplate method, enabling it to float up automatically with the water level for easy removal; when the water flows onto the floating body block, it overflows to the lower layer of fluid from the surrounding of the floating body block, and can reduce the disturbance between the stratified fluids.

[0037] 3. The present invention combines the drawplate method and adds a floating body block, effectively reducing the disturbance caused by the drawplate.

[0038] 4. Design the water inlet at the bottom of the water trough as a mushroom shape to increase the water outlet area, so that when injecting fluid from the bottom of the water trough, the impact of the newly injected fluid on the existing fluid in the water trough can be reduced (when the water pressure injected into the water trough is constant, increasing the acting area reduces the acting force), achieving the effect of reducing the molecular diffusion caused by the disturbance when producing a continuous stratified fluid.

[0039] Through the control of the gate valves, throttle valves, and pipeline booster pumps set on each connecting pipeline, the present invention can produce both continuous stratified fluids and strongly stratified fluids with any thickness, eliminating the limitation that it is difficult to produce different stratified fluid thicknesses in the same device in the drawplate method. Description of the Drawings

[0040] Figure 1 is a schematic structural diagram of the present invention;

[0041] Description of the reference numerals: 1 - brine tank, 2 - stirrer, 3 - water tank, 4 - gate valve, 5 - expanding water outlet, 6 - floating body block, 7 - water trough, 8 - mushroom-shaped water inlet, 9 - gate valve, 10 - gate valve, 11 - flowmeter, 12 - throttle valve, 13 - flowmeter, 14 - throttle valve, 15 - pipeline booster pump. Detailed Embodiment

[0042] The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0044] Refer to Figure 1 As described above, an internal wave experimental device with the functions of both strong stratification and continuous stratified flow preparation in this embodiment includes a brine tank 1, a fresh water tank 2 and a water tank 7, which are connected by pipelines; the water tank 7 is used to store stratified fluid;

[0045] A pipeline between the brine tank 1 and the fresh water tank 2 is provided with a pipeline booster pump 15, a throttle valve 14 and a flow meter 13 for adjusting and monitoring the flow rate of brine flowing from the brine tank 1 into the fresh water tank 3;

[0046] A pipeline between the fresh water tank and the water inlet at the bottom of the water tank is provided with a throttle valve 12 and a flow meter 11 for adjusting and monitoring the flow rate of the mixed brine flowing from the fresh water tank 3 into the water tank 7;

[0047] The pipelines between the top opening of the fresh water tank 3 and the water tank 7 and the water inlet at the bottom of the water tank 7 are respectively provided with a gate valve 4 and a gate valve 9 for controlling the on-off of the mixed brine in the fresh water tank 3. A branch pipeline is provided on the pipeline between the fresh water tank 3 and the water inlet at the bottom of the water tank 7, and a gate valve 10 is installed; the branch pipeline is used to release the unused stratified fluid after the experiment, and the on-off of the fluid in the branch pipeline is controlled by the gate valve 10.

[0048] The water outlet of the pipeline where the fresh water tank 3 extends to the top opening of the water tank 7 is an expanded water outlet 5, which increases the contact area between the water outlet and the floating body block, effectively reduces the impact of the water outlet on the floating body block, and further reduces the disturbance caused during the preparation of strong stratified fluid. A floating body block 6 is arranged directly below the expanded water outlet 5, and the floating body block 6 is located on the liquid surface in the water tank 7, so that after the water flow in the fresh water tank flows onto the floating body block, it overflows from the surrounding of the floating body block onto the water tank fluid, reducing the disturbance to the water tank fluid.

[0049] Preferably, the water inlet at the bottom of the water tank 7 is mushroom-shaped, which increases the water outlet area.

[0050] Preferably, a stirrer 2 is arranged in the fresh water tank 3 for uniformly mixing the high-concentration brine in the brine tank 1 and the fresh water in the fresh water tank 3.

[0051] Example 1, the specific steps for preparing continuous stratified fluid with an arbitrary density profile:

[0052] (1) Ensure that the gate valves 4, 9, and 10 are in the closed state;

[0053] (2) Prepare the required high-concentration brine and fresh water in the brine tank 1 and the fresh water tank 3 respectively (the concentration can be detected by a conductivity meter);

[0054] (3) Connect the pipeline booster pump 15 so that its pressure is higher than the water pressure in the fresh water tank 3;

[0055] (4) Start the stirrer 2 and mix evenly when the high-concentration brine flows in;

[0056] (5) Open the gate valve 9 and adjust the throttle valves 12 and 14 respectively to make the flow rate from the brine tank 1 to the fresh water tank 3 be q, and the flow rate from the fresh water tank 3 to the water tank 7 be Q;

[0057] (6) When the stratified fluid produced reaches the specified height, close the pipeline booster pump 15 and the gate valve 9, and the work is completed.

[0058] During the above process, the two tanks are at a relatively high position relative to the water tank 7, and the fluid in the fresh water tank 3 can flow smoothly into the water tank 7. When the water in the fresh water tank 3 is mixed with the high-concentration brine, it is injected into the bottom of the water tank 7 at a flow rate of Q. At this time, the water volume in the fresh water tank 3 gradually decreases, but the high-concentration brine in the brine tank 1 still flows into the fresh water tank 3 at a flow rate of q and mixes evenly with the fresh water inside. As the high-concentration brine gradually increases, the brine concentration in the right fresh water tank 3 also becomes higher and higher, and the brine concentration flowing into the water tank 7 gradually becomes larger. Since the brine concentration injected into the water tank 7 first is smaller than that injected later, the denser brine injected later can "push" the less dense brine in the water tank 7 upward. When it reaches the specified height, a continuously stratified stratified fluid is formed. Among them, after calculation, when , the brine density in the water tank 7 can increase linearly with depth, and a stratified fluid with a linearly varying density with depth can be obtained. In addition, from ρ = 1006.0 + 737.7S - 0.311c - 1.993×10 -3 c 2 (where ρ is the brine density, S is the mass concentration of the brine, and c is the Celsius temperature of the brine), it can be seen that when the temperature remains unchanged, the brine density and the mass concentration of the brine are in a linear relationship. Taking the mass concentration of the brine as an intermediate variable, by keeping the opening of the throttle valve 12 unchanged, that is, Q remains unchanged, and then adjusting the pipeline booster pump 15 according to the required density profile and changing the opening of the throttle valve 14, so that the high-concentration brine flows into the fresh water tank 3 at a flow rate of q(t), a density profile that changes as required can be obtained. Among them, according to the relationship between the increase in the total salt content of the brine in the fresh water tank 3 and time, we can get:

[0059]

[0060] where S0 is the concentration of the high-concentration brine, S(t) is the brine concentration in the fresh water tank 3 at time t, S(0) is the brine concentration in the fresh water tank 3 at the initial time, V is the volume of the fluid in the fresh water tank, q(ξ) is the flow rate flowing into the fresh water tank, and Q is the flow rate flowing into the water tank.

[0061] The salt water in the fresh water tank 3 is obtained by uniformly mixing the high-concentration salt water flowing from the salt water tank 1, and then injected into the experimental water tank 7. The left side of the above equation represents the increased mass of salt in the fresh water tank 3 at time t relative to the initial time. The first term on the right side represents the total mass of salt in the fresh water tank 3 at time t, and the second term represents the total mass of salt in the fresh water tank 3 at the initial time. The subtraction of the two terms gives the increased mass of salt in the fresh water tank at time t relative to the initial time. Differentiate and transform the relationship between the salt mass increment and time in the fresh water tank 3, and let It can be obtained that:

[0062]

[0063] (When t = 0, S(0) is a known condition, then )

[0064] Example 2, specific steps to prepare a strongly stratified fluid (upper layer density is 1023 kg / m 3， lower layer density is 995 kg / m 3 ):

[0065] Generally, in order to simplify the experiment, the continuously stratified ocean structure is simplified into a strongly stratified model. The following are the steps to prepare a strongly stratified fluid using this device:

[0066] (1) Close the pipeline booster pump 15, and keep the throttle valve 13, gate valves 4, 9, and 10 in the closed state;

[0067] (2) Prepare salt water with a density of 1023 kg / m 3 in the fresh water tank 3, and use the stirrer 2 to mix it evenly during preparation;

[0068] (3) Open the gate valve 9, and keep the valve orifice of the throttle valve 12 at the maximum opening to quickly inject the prepared salt water into the water tank 7;

[0069] (4) When the lower layer of fluid is injected to the specified height, close the gate valve 9;

[0070] (5) Open the gate valve 10, empty the remaining salt water, and wash the fresh water tank 3 once. After washing, close the gate valve 10;

[0071] (6) Inject fresh water with a density of 995 kg / m 3 into the fresh water tank 3, and put the floating block 6 into the water tank;

[0072] (7) Open the gate valve 4, and fix the hose by hand to keep the expanding water outlet 5 at a certain distance from the floating block 6 and in the middle position of the floating block 6 to prevent the floating block 6 from tilting significantly. When the water flows onto the floating block, it overflows from the four sides of the floating block onto the lower layer of fluid, reducing the disturbance to the lower layer of fluid;

[0073] When the upper fluid reaches the specified height, close the gate valve 4, remove the floating body block 6, and store the unused hose at the specified position. The preparation of the strong stratified fluid is completed.

[0074] When preparing the strong stratified fluid by the double-cylinder method, when injecting water through the bottom of the water tank 7, the denser brine "pushes" the less dense fluid, resulting in relatively large disturbances and obvious mixing. Therefore, when preparing the strong stratified fluid, the floating body block 6 is used to replace the baffle based on the principle of the drawplate method, which can effectively reduce the diffusion between the stratified fluids caused by the drawplate. In addition, the pipe connected to the expanding water outlet in the original figure is a flexible hose that can be bent at will, which is convenient for removal and can maintain the relative distance between the expanding water outlet 5 and the floating body block 6 at any time.

[0075] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principle and spirit of the present invention.

Claims

1. An internal wave experimental device, characterized in that: The invention comprises a salt water tank, a clean water tank and a water tank, which are connected by a pipe. The water tank is used to store stratified fluid. The water outlet of the pipe extending from the clean water tank to the top opening of the water tank is an expansion-shaped water outlet, which increases the contact area between the outlet water and the float block, effectively reduces the impact of the outlet water on the float block, and thus reduces the disturbance caused when the strongly stratified fluid is prepared. The invention also comprises a float block, which is located on the liquid surface in the water tank and is opposite to the water outlet of the pipe extending from the clean water tank to the top opening of the water tank, so that after the water in the clean water tank flows to the float block, it overflows from the surroundings of the float block to the water tank fluid, thereby reducing the disturbance to the water tank fluid. The pipeline between the salt water tank and the clean water tank is provided with a pipeline booster pump, a throttle valve and a flow meter for adjusting and monitoring the flow of salt water from the salt water tank into the clean water tank; A throttle valve and a flow meter are provided in the pipeline between the clean water tank and the water inlet at the bottom of the water tank, which are used to adjust and monitor the flow rate of the mixed salt water flowing from the clean water tank into the water tank; The pipelines between the clean water tank and the top opening of the water tank and the water inlet at the bottom of the water tank are all provided with gate valves for on-off control of the mixed salt water in the clean water tank; The method for preparing a continuous layered fluid with an arbitrary density profile using the internal wave experimental device comprises the following specific steps: Step 1: Close all gate valves; Step 2: injecting the prepared high-concentration salt water and clean water into the salt water tank and the clean water tank respectively; Step 3: Connect the pipeline booster pump to make the pressure on one side of the salt water tank higher than the water pressure in the clean water tank; Step 4: High-concentration salt water flows into the clean water tank and is mixed evenly; Step 5: Open the gate valve between the clean water tank and the water inlet at the bottom of the water tank, and adjust the two throttle valves respectively so that the high-concentration brine flow from the brine tank to the clean water tank is q, and the mixed brine flow from the clean water tank to the water tank is Q; Step 6: When the prepared stratified fluid reaches the specified height, close the gate valve between the pipeline booster pump and the clean water tank and the water inlet at the bottom of the water tank, and the work is completed; The specific steps of the method for preparing a strongly stratified fluid using the internal wave experimental device are as follows: Step 1: Close the pipeline booster pump, all gate valves, and the throttle valve between the salt water tank and the clean water tank; Step 2: preparing salt water with a set density in the clean water tank and mixing it evenly; Step 3: Open the gate valve between the clean water tank and the water inlet at the bottom of the water tank, adjust the valve port of the throttle valve between the clean water tank and the water inlet at the bottom of the water tank to the maximum opening, so that the prepared brine in the clean water tank is quickly injected into the water tank; Step 4: After the lower layer of fluid is injected to a specified height, the gate valve between the clean water tank and the water inlet at the bottom of the water tank is closed; Step 5: Drain the remaining brine in the pipeline and clean the clean water tank; Step 6: inject clean water of a set density into the clean water tank, and place the float block into the water tank; Step 7: Open the gate valve of the pipeline between the clean water tank and the top opening of the water tank, so that the expanded water outlet is kept at a certain distance from the floating block and directly faces the middle of the floating block to prevent the floating block from tilting; when the water flows onto the floating block, it overflows from the surroundings of the floating block to the lower fluid, reducing the disturbance to the lower fluid; Step 8: When the upper fluid reaches the specified height, close the gate valve of the pipeline between the fresh water tank and the top opening of the water tank, and take out the floating body block. The preparation of the strong stratified fluid is completed.

2. The internal wave experiment device according to claim 1, wherein: The water inlet at the bottom of the water tank is mushroom-shaped, which increases the water outlet area.

3. The internal wave experimental device according to claim 1, characterized in that: A stirrer is arranged in the fresh water tank for uniformly mixing the high-concentration brine in the brine tank and the fresh water in the fresh water tank.

4. The internal wave experiment device according to claim 1, wherein: A branch pipeline is arranged on the pipeline between the fresh water tank and the water inlet at the bottom of the water tank, and a gate valve is installed; the branch pipeline is used to release the unused stratified fluid after the experiment, and the on-off of the fluid in the branch pipeline is controlled by the gate valve.

5. The internal wave experimental device according to claim 1, wherein: The heights of the brine tank and the fresh water tank are higher than the height of the water tank.

6. The internal wave experimental device according to claim 1, characterized in that: The pipeline between the fresh water tank and the top opening of the water tank can adopt a flexible hose.

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