An experimental device and method for wind-wave-current-sea ice coupling based on an internal circulation

Abstract

The present invention provides a wind-wave-current-sea ice coupling experimental device and an experimental method based on an internal circulation, belonging to the field of ship and ocean engineering experiments. It solves the problem that the existing solutions cannot meet the requirements of wind-wave-current-sea ice coupling experiments. The experimental device includes a wind generation system, a wave generation system, a current generation system and a wave dissipation device. The wind generation system and the wave generation system are both arranged on the same side of the slender ice tank. The wind generation system is located outside the slender ice tank, and the wave generation system is located inside the slender ice tank. Wave dissipation devices are arranged on both sides inside the slender ice tank. The current generation system is arranged along the length direction in the center of the slender ice tank. The current generation system includes a two-way current pump, a split fairing, an integrated fairing and a sandwich bottom. The split fairing is located on the side close to the wave generation system. It is mainly used for conducting wind-wave-current-sea ice coupling experiments.

Description

Technical Field

[0001] The present invention belongs to the field of ship and ocean engineering experiments, and particularly relates to a wind-wave-current-sea ice coupling experimental device and experimental method based on internal circulation. Background Technique

[0002] In the past four decades, the coverage area and thickness of Arctic sea ice have been continuously decreasing, and the attention of various countries to the Arctic has been increasing. The polar regions are rich in oil and gas, fishery and other resources. In addition, the opening of the Arctic shipping route has reduced the voyage by at least 40%, greatly improving the shipping efficiency. In order to develop Arctic resources and the Arctic shipping route, countries have increased their research and development efforts on polar navigation ships and floating structures. The extreme load environment conditions in the polar regions have also caused many complex mechanical problems. Compared with conventional sea areas, the research on the unique sea ice load in the polar regions is particularly important. The wind-wave-current load in the ocean induces the drift and accumulation of sea ice and interacts with structures, which has always been an issue that needs to be studied.

[0003] The sea ice encountered by polar ships during icebreaking navigation is divided into two types according to its surface characteristics: level ice and deformed ice. Civil ships are mainly applicable to level ice. Therefore, by analyzing the dynamic response of level ice under the coupling conditions of wind, wave and current, the icebreaking ability of civil ships and merchant ships can be improved, the icebreaking efficiency can be increased, and the benefits can be enhanced.

[0004] In the existing related research, there has not been an experimental device for observing the dynamic response of level ice under the coupling conditions of wind, wave, current and sea ice in a slender ice tank. The flow-making area of a square ice tank is usually only within 1 / 2 - 1 / 3 of the tank width, which allows the sea current generated by the flow-making machine to flow back in the non-flow-making area and rotate at the far end of the experiment, as Figure 13 shown. For a slender long towing tank, the flow-making area usually needs to be equal to or slightly smaller than the tank width, and the traditional long towing tank cannot meet the requirements of wind-wave-current-sea ice coupling experiments.

[0005] Chinese Patent No. CN114910249A discloses a wind-wave-current and sea ice dynamic coupling experimental device and a sea ice drift and accumulation experimental method, which mainly aims to observe the dynamic response of ocean engineering structures under the coupling conditions of wind, wave, current and sea ice in a square tank. The flow-making method adopted is the conventional external circulation flow-making method, which is not applicable to flow-making in a slender ice tank. And the main experimental object it aims at is to analyze the drift and accumulation of broken ice, which is not applicable to the damage and fracture analysis of large-size sea ice. Summary of the Invention

[0006] In view of this, the present invention aims to provide a wind-wave-current-sea ice coupling experimental device and experimental method based on internal circulation to solve the problem that the existing solutions cannot meet the requirements of wind-wave-current-sea ice coupling experiments.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A wind-wave-current-sea ice coupling experimental device based on an internal circulation, which includes a wind generation system, a wave generation system, a current generation system, and a wave dissipation device. The wind generation system and the wave generation system are both arranged on the same side of the slender ice tank. The wind generation system is located outside the slender ice tank, and the wave generation system is located inside the slender ice tank. Wave dissipation devices are arranged on both sides inside the slender ice tank. The current generation system is arranged along the length direction in the center of the slender ice tank. The current generation system includes a two-way current pump, a split fairing, an integrated fairing, and a sandwich bottom. The split fairing is located on the side close to the wave generation system. The integrated fairing is horizontally arranged opposite to the split fairing. The sandwich bottom is horizontally arranged between the split fairing and the integrated fairing. The number of the two-way current pumps is two, and the two two-way current pumps are respectively arranged on the split fairing and the integrated fairing, and the two two-way current pumps are located below the sandwich bottom. The split fairing includes multiple split fairing plates with adjustable angles.

[0008] Furthermore, the wind generation system includes a fan, a double-direction adjustable grille, and an adjustable fan base. The fan and the double-direction adjustable grille are both installed on the adjustable fan base. The double-direction adjustable grille is arranged in front of the air outlet of the fan. The adjustable fan base is connected to the slender ice tank.

[0009] Furthermore, the double-direction adjustable grille includes a longitudinal angle regulator, multiple longitudinal blades, a transverse angle regulator, and multiple transverse blades. The multiple transverse blades are all connected to the transverse angle regulator, and the multiple longitudinal blades are all connected to the longitudinal angle regulator.

[0010] Furthermore, the wave generation system is a rocker wave generator. The rocker wave generator includes a rocker support, an arc-shaped connecting plate, a driving motor, and a fan-shaped rocker. The arc-shaped connecting plate is connected to the driving motor. The lower part of the fan-shaped rocker is rotatably connected to the rocker support, and the upper part of the fan-shaped rocker is connected to the arc-shaped connecting plate. The rocker support is connected to the slender ice tank.

[0011] Furthermore, the wave dissipation device includes a bottom slide rail, a vertical slide rail, a pulley, and a wave dissipation plate. The bottom slide rail is connected to the bottom surface of the slender ice tank, the vertical slide rail is connected to the side wall of the slender ice tank, and both sides of the wave dissipation plate are respectively connected to the bottom slide rail and the vertical slide rail through pulleys.

[0012] Furthermore, a number of perforations are formed on the split fairing plate.

[0013] Furthermore, the perforations are square structures.

[0014] Furthermore, the detachable fairing further includes a fairing base, and the number of detachable fairing plates is three, and the three detachable fairing plates are arranged above the fairing base.

[0015] Furthermore, the detachable fairing plate is made of composite material, and the clamping bottom is made of alloy material.

[0016] The present invention also provides an experimental method for a wind-wave-current-sea ice coupling experiment device based on an internal circulation, which includes the following steps:

[0017] Step 1: Install the experimental device, where the uppermost side of the current generation system is between 15 - 20 cm from the still water surface;

[0018] Step 2: Place the layer ice, the thickness of the layer ice is 5 mm, and the left side of the layer ice is between 1.5 - 2.5 m from the rightmost side that the wave generation system can reach;

[0019] Step 3: Turn on the wind generation system and adjust the left - right wind direction and up - down wind direction, with the wind speed of 2 - 10 m / s;

[0020] Step 4: Turn on two two - way current pumps, and the two two - way current pumps respectively perform pushing flow and suction flow to generate a flow direction that is the same as or opposite to the wave direction. The water flow rotates clockwise or counterclockwise around the clamping bottom to form an internal circulation water flow. Adjust the power of the two - way current pumps to control the flow rate between 0.02 - 0.2 m / s. After the flow rate is stable, adjust the angle between the detachable fairing plate and the oncoming flow to simulate the polar flow field;

[0021] Step 5: Turn on the wave generation system, adjust the power and intensity of the wave generation system, and then control the wave height and wavelength, with the wave height controlled within 0.1 m and the wavelength between 1.5 - 2 m;

[0022] Step 6: Adjust the wave - eliminating device until at least 85% of the waves are eliminated;

[0023] Step 7: Record the experimental data, collect the experimental images, and observe the fracture length and damage form of the layer ice.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a wind - wave - current - sea ice coupling experiment device and an experimental method applicable to an elongated ice tank. It can generate wind and waves relying on the wind generation system and the wave generation system, and generate current relying on the internal - circulation type current generation system, thereby completing the coupling of wind - wave - current and sea ice in the ice tank and conducting the dynamic response of the sea ice structure.

[0025] Specific advantages are as follows:

[0026] 1. It fills the blank of the experiment for observing and analyzing the damage and fracture of large - size sea ice under the coupling conditions of simulating wind - wave - current - sea ice in the existing elongated ice tank.

[0027] 2. The method of creating a current by using an internal circulation can ensure the uniformity and continuity of the ocean current in the experiment, and at the same time reduce the influence of the outside of the ice tank.

[0028] 3. By using an internal circulation to create a current and utilizing a sandwich bottom to achieve up-and-down circulation of the current, the required space is relatively small, which makes up for the deficiency that the existing lateral circulation for creating a current is only applicable to square ice tanks and solves the problem of inconvenient current creation in slender ice tanks.

[0029] 4. The internal circulation current creation system adopts a split fairing, which meets the requirement of unidirectional fluid flow, reduces the energy attenuation of waves, and at the same time the split fairing also reduces the obstruction to the waves in the upper part of the sandwich bottom, and can more accurately simulate the coupling of the polar region and the flowing region.

[0030] 5. The internal circulation current creation system adopts a two-way current creation pump, which can achieve two-way current creation and is convenient for simulating and observing different working conditions.

[0031] 6. A detachable double-directional grille is adopted in front of the wind generation system, which is convenient for controlling the wind direction and simulating various working conditions.

[0032] 7. The wave dissipation system adopts a slide rail device, which can adjust the angle and is convenient for the experiment to be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0034] Figure 1 is a schematic structural diagram of a wind-wave-current-sea ice coupling experiment device based on internal circulation according to the present invention;

[0035] Figure 2 is a schematic structural diagram of the wind generation system according to the present invention;

[0036] Figure 3 is a schematic structural diagram of the double-directional grille according to the present invention;

[0037] Figure 4 is a schematic horizontal direction diagram of the wind wave and current according to the present invention;

[0038] Figure 5 is a schematic vertical direction diagram of the wind wave and current according to the present invention;

[0039] Figure 6 is a schematic structural diagram of the wave generation system according to the present invention;

[0040] Figure 7 is a schematic structural diagram of the current creation system according to the present invention;

[0041] Figure 8 is a schematic structural diagram of the split fairing according to the present invention;

[0042] Figure 9 Schematic diagram of the split rectifier plate structure according to the present invention;

[0043] Figure 10 Schematic diagram of the wave elimination device structure according to the present invention;

[0044] Figure 11 Schematic diagram of the wave elimination plate structure according to the present invention;

[0045] Figure 12 Schematic diagram of the state of laminated ice damage according to the present invention;

[0046] Figure 13 Schematic diagram of the existing flow generation method in a square ice tank according to the present invention.

[0047] In the figure: 1: Wind generation system, 2: Wave generation system, 3: Flow generation system, 4: Wave elimination device, 5: Laminated ice, 6: Slender ice tank, 7: Square ice tank, 8: Flow generator, 9: Flow generation test section, 10: Return flow, 1-1: Fan, 1-2: Double-adjustable grille, 1-3: Adjustable fan base, 1-2-1: Longitudinal angle adjuster, 1-2-2: Longitudinal blade, 1-2-3: Transverse angle adjuster, 1-2-4: Transverse blade, 2-1: Rocker plate support, 2-2: Arc-shaped connecting plate, 2-3: Driving motor, 2-4: Sector-shaped rocker plate, 3-1: Bidirectional flow generation pump, 3-2: Split rectifier cover, 3-3: Integral rectifier cover, 3-4: Clamped bottom, 4-1: Bottom slide rail, 4-2: Vertical slide rail, 4-3: Pulley, 4-4: Wave elimination plate. Specific embodiments

[0048] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0049] See Figures 1-12 Describing this embodiment, a wind-wave-flow-sea ice coupling experimental device based on internal circulation, which includes a wind generation system 1, a wave generation system 2, a flow generation system 3 and a wave elimination device 4. The wind generation system 1 and the wave generation system 2 are both arranged on the same side of the slender ice tank 6. The wind generation system 1 is located outside the slender ice tank 6, and the wave generation system 2 is located inside the slender ice tank 6. Wave elimination devices 4 are arranged on both sides inside the slender ice tank 6. The flow generation system 3 is arranged along the length direction in the center of the slender ice tank 6 and is fixed to the bottom of the slender ice tank 6 with screws.

[0050] The flow generating system 3 includes a bidirectional flow generating pump 3-1, a separable fairing 3-2, an integral fairing 3-3 and a sandwich bottom 3-4. The separable fairing 3-2 is located on the side close to the wave generating system 2. The integral fairing 3-3 is arranged horizontally opposite to the separable fairing 3-2. The sandwich bottom 3-4 is horizontally arranged between the separable fairing 3-2 and the integral fairing 3-3. The number of the bidirectional flow generating pumps 3-1 is two, and the two bidirectional flow generating pumps 3-1 are respectively arranged on the separable fairing 3-2 and the integral fairing 3-3, and the two bidirectional flow generating pumps 3-1 are located below the sandwich bottom 3-4. The separable fairing 3-2 includes a plurality of separable fairing plates with adjustable angles. Bidirectional flow can be realized during the experiment by the two bidirectional flow generating pumps 3-1. The sandwich bottom 3-4 isolates the flow near the water surface and the flow near the bottom of the slender ice tank 6 to avoid mutual interference between them.

[0051] The separable fairing 3-2 includes a fairing base and a plurality of separable fairing plates with adjustable angles. The plurality of separable fairing plates are arranged above the fairing base. Preferably, the number of the separable fairing plates is three. The separable fairing plates are made of composite materials and can be adjusted in angle. The angles of the three separable fairing plates are adjusted respectively according to different oncoming flow velocities and directions, so as to obtain the oncoming flow that meets the experimental requirements and make the oncoming flow above the sandwich bottom parallel to the wave direction.

[0052] Preferably, a plurality of perforations are formed on the separable fairing plates. The perforations are square structures, so that the waves can pass through the perforations, which can reduce the consumption of wave energy to the greatest extent and enable the waves to be coupled with the waves on the sandwich bottom 3-4.

[0053] The integral fairing 3-3 can adjust the flow direction on the right side of the device, so that the backflow above and below the sandwich bottom 3-4 can be completed and then enter the bidirectional flow generating pump 3-1 on the right side. The sandwich bottom 3-4 is a horizontal alloy material plate located between the separable fairing 3-2 and the integral fairing 3-3, which separates the oncoming flows with different flow directions above and below the sandwich bottom 3-4 to avoid mutual interference between them.

[0054] The wind generating system 1 includes a fan 1-1, a double-directional grille 1-2 and an adjustable fan base 1-3. The adjustable fan base 1-3 is adjusted to a suitable height, and then the fan 1-1 and the double-directional grille 1-2 are installed on the upper part of the adjustable fan base 1-3 by screws. The double-directional grille 1-2 is arranged in front of the air outlet of the fan 1-1. The adjustable fan base 1-3 is connected to the slender ice tank 6. The wind generating system 1 is placed on the left side outside the slender ice tank 6.

[0055] The double-directional grille 1-2 includes a longitudinal angle adjuster 1-2-1, a plurality of longitudinal blades 1-2-2, a transverse angle adjuster 1-2-3 and a plurality of transverse blades 1-2-4. The plurality of transverse blades 1-2-4 are all connected to the transverse angle adjuster 1-2-3, and the plurality of longitudinal blades 1-2-2 are all connected to the longitudinal angle adjuster 1-2-1. The double-directional grille 1-2 can change the wind direction. The left-right wind direction is adjusted by the longitudinal angle adjuster 1-2-1, and the up-down wind direction is adjusted by the transverse angle adjuster 1-2-3, thereby changing the magnitudes of the wind direction angles α and β.

[0056] Taking the flap wave maker as an example, the wave-making system 2 is a flap wave maker. The flap wave maker is placed on the left side inside the slender ice tank 6 and fixed to the bottom of the tank and the inner bottom plate with screws. The flap wave maker includes a flap bracket 2-1, an arc-shaped connecting plate 2-2, a driving motor 2-3 and a sector flap 2-4. The arc-shaped connecting plate 2-2 is connected to the driving motor 2-3. The lower part of the sector flap 2-4 is rotatably connected to the flap bracket 2-1, and the upper part of the sector flap 2-4 is connected to the arc-shaped connecting plate 2-2. The flap bracket 2-1 is connected to the slender ice tank 6. By driving the arc-shaped connecting plate 2-2 with the driving motor 2-3, and then driving the sector flap 2-4, the swaying speed and swaying intensity of the sector flap 2-4 are changed by changing the frequency and power of the driving motor 2-3, thereby controlling variables such as the wave height.

[0057] The wave-dissipating device 4 includes a bottom slide rail 4-1, a vertical slide rail 4-2, a pulley 4-3 and a wave-dissipating plate 4-4. The bottom slide rail 4-1 is connected to the bottom surface of the slender ice tank 6, the vertical slide rail 4-2 is connected to the side wall of the slender ice tank 6, and both sides of the wave-dissipating plate 4-4 are respectively connected to the bottom slide rail 4-1 and the vertical slide rail 4-2 through the pulley 4-3. The angle of the wave-dissipating plate 4-4 is adjustable. The wave-dissipating plate 4-4 is made of a composite material, and the bottom slide rail 4-1 and the vertical slide rail 4-2 are made of alloy steel to slow down corrosion and are fixed to the bottom on the left and right sides inside the slender ice tank 6.

[0058] This embodiment is an experimental method for an in-circulation-based wind-wave-current-sea ice coupling experimental device, which includes the following steps:

[0059] Step 1: Install the experimental device. Adjust the adjustable fan base 1-3 to an appropriate height, and then install the fan 1-1 and the double-directional grille 1-2 on the upper part of the adjustable fan base 1-3 with screws. Fix the slide rails of the wave-making system 2, the current-making system 3 and the wave-dissipating device 4 inside the slender ice tank 6 with screws. The uppermost side of the current-making system 3 is between 15 - 20 cm from the still water surface to avoid the mutual interference between the waves and the flow field.

[0060] Step 2: Place the layer of ice 5 with a thickness of about 5 mm. The distance between the left side of the layer of ice 5 and the rightmost reachable position of the sector-shaped rocker 2-4 of the wave-making system 2 is between 1.5 - 2.5 m. Since the first wave generated by the wave-making system 2 is relatively unstable, a distance of about one wavelength needs to be reserved to meet the development requirements of the wave.

[0061] Step 3: Turn on the fan 1-1, change the wind direction through the double-directional grille 1-2, adjust the left-right wind direction through the longitudinal angle regulator 1-2-1 to an appropriate α angle; adjust the up-down wind direction through the transverse angle regulator 1-2-3 to an appropriate β angle, and control the wind speed at 2 - 10 m / s to simulate the polar wind field.

[0062] Step 4: Turn on the two bidirectional flow pumps 3-1. The two bidirectional flow pumps 3-1 respectively perform pushing flow and suction flow. If the left bidirectional flow pump 3-1 performs pushing flow and the right bidirectional flow pump 3-1 performs suction flow, the water flow will flow clockwise in the internal circulation flow system 3; if the left bidirectional flow pump 3-1 performs suction flow and the right bidirectional flow pump 3-1 performs pushing flow, the water flow will flow counterclockwise in the internal circulation flow system 3. Thus, a water flow direction same as or opposite to the wave direction is generated. Adjust the power of the bidirectional flow pump 3-1 to make the water flow reach a velocity of 0.02 - 0.2 m / s. After the velocity is stable, adjust the angle between the separated rectifying plate and the oncoming flow to simulate the polar flow field.

[0063] Step 5: Turn on the wave-making system 2, adjust the power and intensity of the driving motor 2-3. Drive the arc-shaped connecting plate 2-2 through the driving motor 2-3, and then drive the sector-shaped rocker 2-4. By changing the frequency and power of the driving motor 2-3, change the rocking speed and rocking intensity of the sector-shaped rocker 2-4, and then control variables such as the wave height, with the wave height controlled within 0.1 m and the wavelength between 1.5 - 2 m.

[0064] Step 6: Adjust the angle of the wave-dissipating plate 4-4 in the wave-dissipating device 4 until at least 85% of the waves are dissipated, achieving a good wave-dissipating effect.

[0065] Step 7: Record the experimental data, collect the experimental images, and observe the fracture length and damage form of the layer of ice 5. The damage form of the layer of ice 5 is as Figure 12 shown.

[0066] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. According to the content of this specification, many modifications and variations can be made. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the relevant technical field can well understand and utilize the present invention.

Claims

1. An experimental device for wind-wave-current-sea ice coupling based on internal circulation, Characterized in that: It includes a wind generation system (1), a wave generation system (2), a current generation system (3) and a wave dissipation device (4). The wind generation system (1) and the wave generation system (2) are both arranged on the same side of the slender ice tank (6). The wind generation system (1) is located outside the slender ice tank (6), and the wave generation system (2) is located inside the slender ice tank (6). Wave dissipation devices (4) are arranged on both sides inside the slender ice tank (6). The current generation system (3) is arranged along the length direction in the center of the slender ice tank (6). The current generation system (3) includes a two-way current pump (3-1), a split fairing (3-2), an integrated fairing (3-3) and a sandwich bottom (3-4). The split fairing (3-2) is located on the side close to the wave generation system (2). The integrated fairing (3-3) is horizontally opposite to the split fairing (3-2). The sandwich bottom (3-4) is horizontally arranged between the split fairing (3-2) and the integrated fairing (3-3). The number of the two-way current pumps (3-1) is two, and the two two-way current pumps (3-1) are respectively arranged on the split fairing (3-2) and the integrated fairing (3-3), and the two two-way current pumps (3-1) are located below the sandwich bottom (3-4). The split fairing (3-2) includes multiple split fairing plates with adjustable angles. The wave dissipation device (4) includes a bottom slide rail (4-1), a vertical slide rail (4-2), a pulley (4-3) and a wave dissipation plate (4-4). The bottom slide rail (4-1) is connected to the bottom surface of the slender ice tank (6), the vertical slide rail (4-2) is connected to the side wall of the slender ice tank (6), and both sides of the wave dissipation plate (4-4) are respectively connected to the bottom slide rail (4-1) and the vertical slide rail (4-2) through the pulley (4-3).

2. The experimental device for wind-wave-current-sea ice coupling based on internal circulation according to claim 1, Characterized in that: The wind generation system (1) includes a fan (1-1), a double-directional grille (1-2) and an adjustable fan base (1-3). The fan (1-1) and the double-directional grille (1-2) are both installed on the adjustable fan base (1-3). The double-directional grille (1-2) is arranged in front of the air outlet of the fan (1-1), and the adjustable fan base (1-3) is connected to the slender ice tank (6).

3. The experimental device for wind-wave-current-sea ice coupling based on internal circulation according to claim 2, Characterized in that: The double-directional grille (1-2) includes a longitudinal angle regulator (1-2-1), a plurality of longitudinal blades (1-2-2), a transverse angle regulator (1-2-3) and a plurality of transverse blades (1-2-4). The plurality of transverse blades (1-2-4) are all connected to the transverse angle regulator (1-2-3), and the plurality of longitudinal blades (1-2-2) are all connected to the longitudinal angle regulator (1-2-1).

4. The experimental device for wind-wave-current-sea ice coupling based on internal circulation according to claim 1, Characterized in that: The wave-making system (2) is a flap wave maker, which includes a flap support (2-1), an arc connecting plate (2-2), a driving motor (2-3) and a sector flap (2-4). The arc connecting plate (2-2) is connected to the driving motor (2-3). The lower part of the sector flap (2-4) is rotationally connected to the flap support (2-1). The upper part of the sector flap (2-4) is connected to the arc connecting plate (2-2). The flap support (2-1) is connected to the slender ice tank (6).

5. The experimental device for wind-wave-current-sea ice coupling based on internal circulation according to claim 1, characterized in that: A plurality of perforations are provided on the separated flow rectifying plate.

6. The experimental device for wind-wave-current-sea ice coupling based on internal circulation according to claim 5, characterized in that: The perforations are of square structure.

7. The experimental device for wind-wave-current-sea ice coupling based on internal circulation according to claim 1, characterized in that: The separated flow rectifying cover (3-2) further includes a rectifying cover base. The number of the separated flow rectifying plates is three, and the three separated flow rectifying plates are arranged above the rectifying cover base.

8. The experimental device for wind-wave-current-sea ice coupling based on internal circulation according to claim 1, characterized in that: The separated flow rectifying plate is made of composite material, and the clamping bottom (3-4) is made of alloy material.

9. An experimental method for the experimental device for wind-wave-current-sea ice coupling based on internal circulation according to claim 1, characterized in that: It includes the following steps: Step 1: Install the experimental device, where the uppermost side of the flow-making system (3) is between 15-20 cm from the still water surface; Step 2: Place the layer ice (5) with a thickness of 5 mm. The left side of the layer ice is between 1.5-2.5 m from the rightmost side that the wave-making system (2) can reach; Step 3: Turn on the wind-making system (1) and adjust the left-right wind direction and up-down wind direction, with a wind speed of 2-10 m / s; Step 4: Turn on two two-way flow-making pumps (3-1). The two two-way flow-making pumps (3-1) respectively perform pushing flow and suction flow to generate a flow direction that is the same as or opposite to the wave direction. The water flow rotates clockwise or counterclockwise around the clamping bottom (3-4) to form an internal circulation water flow. Adjust the power of the two-way flow-making pumps (3-1) to control the flow rate between 0.02-0.2 m / s. After the flow rate is stable, adjust the angle between the separated flow rectifying plate and the oncoming flow to simulate the polar flow field; Step 5: Turn on the wave-making system (2) and adjust the power and intensity of the wave-making system (2) to control the wave height and wavelength, with the wave height controlled within 0.1 m and the wavelength between 1.5-2 m; Step 6: Adjust the wave elimination device (4) until at least 85% of the waves are eliminated; Step 7: Record the experimental data, collect the experimental images, and observe the fracture length and damage form of the layer ice (5).

Images