A container for inhibiting liquid level fluctuation and a method for stabilizing flow of a water tank of a gravity water tunnel

Abstract

This invention discloses a container for suppressing liquid surface fluctuations and a method for stabilizing the flow of a water tank in a gravity-type water tunnel, belonging to the technical field of liquid storage equipment. The container for suppressing liquid surface fluctuations includes a semi-enclosed container and a resistance module and a wave-absorbing module placed inside the container. The inlet and outlet of the semi-enclosed container are both located on the bottom surface of the container. The resistance module is disposed in the space inside the container between the inlet and outlet to reduce the flow velocity of the liquid in the container. The wave-absorbing module is placed at the top of the container and opposite to the inlet to absorb the energy generated by liquid fluctuations. This invention solves the problem of water flow disturbance on the liquid surface at the inlet and outlet of the water tank.

Description

Technical Field

[0001] This invention belongs to the field of liquid storage equipment technology, specifically relating to a container for suppressing liquid level fluctuations and a method for stabilizing the flow of a water tank in a gravity-type water tunnel. Background Technology

[0002] A water tunnel is a fluid dynamics experimental apparatus primarily used for studying cavitation phenomena, drag reduction, and noise reduction. A gravity water tunnel utilizes the gravity of the water in the upper tank to generate velocity, eliminating the need for a pump and thus exhibiting low noise, making it suitable for measuring flow noise. However, its flow velocity is somewhat affected by the liquid level in the upper tank, and the presence of inlet and outlet disturbs the liquid level, causing significant fluctuations in the outflow velocity, which impacts the complexity of the experimental setup and the accuracy of the results. Containers that suppress liquid level fluctuations can greatly mitigate these problems.

[0003] Currently, methods for suppressing liquid level fluctuations within containers can be categorized into active and passive approaches, depending on whether energy is injected. Active control primarily involves introducing gas to apply and release pressure; passive control mainly involves adding structures at the inlet or inside the container. However, the following shortcomings still exist:

[0004] (1) Active control requires more energy, and the injection of gas places greater demands on the container volume and structural strength.

[0005] (2) Passive control The current technology for suppressing liquid surface fluctuations is mainly used in closed containers. The internal liquid fluctuations are caused only by the vibration of the container's carrier. For example, a flow-locking groove or other structure is set at the bottom of the container. This structure consumes the power of the liquid's up-and-down vibration through the compressibility of the gas film layer, thus suppressing the liquid surface fluctuations. However, in the water tunnel experiment, the liquid in the tank is in a flowing state, and the disturbance of the liquid surface is affected by the inlet and outlet. Therefore, what needs to be eliminated is the disturbance of the liquid surface caused by the water flow at the inlet and outlet. However, the existing structure set at the bottom of the container cannot solve this problem.

[0006] (3) The size and position of the existing structures at the bottom of the container cannot be adjusted, and different arrangement methods cannot be adopted according to the different liquids in the water tank to achieve the maximum inhibition effect. Summary of the Invention

[0007] The technical problem to be solved:

[0008] To avoid the shortcomings of the prior art, the present invention provides a container for suppressing liquid surface fluctuations and a method for stabilizing the flow of a water tank in a gravity-type water tunnel. A resistance module and a wave-absorbing module are coupled inside the container. The positions and sizes of the bead-shaped resistance component, the perforated plate, and the sponge are designed according to the position of the container inlet and the flow velocity at the inlet to solve the problem of water flow disturbance on the liquid surface at the inlet and outlet of the water tank.

[0009] The technical solution of the present invention is: a container for suppressing liquid surface fluctuations, comprising a semi-enclosed container and a resistance module and a wave-absorbing module placed inside the container. The inlet and outlet of the semi-enclosed container are both located on the bottom surface of the container. The resistance module is disposed in the space inside the container between the inlet and the outlet to reduce the flow velocity of the liquid in the container. The wave-absorbing module is placed at the top of the container and opposite to the inlet to absorb the energy generated by the liquid fluctuations.

[0010] A further technical solution of the present invention is: the resistance module includes a perforated plate and a bead-shaped resistance element. The space between the inlet and outlet of the container is divided into multiple spaces by multiple perforated plates, and a number of bead-shaped resistance elements are installed in the space between adjacent perforated plates to generate resistance to the flow of liquid in the container from the inlet to the outlet.

[0011] A further technical solution of the present invention is that the diameter of the bead-shaped resistance element is greater than or equal to 2 cm.

[0012] A further technical solution of the present invention is: the number of perforated plates is three, and the container is divided into four independent spaces by the three mutually parallel perforated plates. The two middle spaces are equipped with bead-shaped resistance components to form a resistance module.

[0013] A further technical solution of the present invention is: the wave-absorbing module includes a sponge assembly, wherein the first sponge in the sponge assembly is located directly above the water inlet of the container, the second sponge is located above the space adjacent to the water inlet, and the first sponge and the second sponge are immersed below the liquid surface to eliminate the free liquid surface above the water inlet in the container.

[0014] A further technical solution of the present invention is: the semi-enclosed container is a box structure with an open top, and the inlet and outlet are located at the two ends of the bottom plate of the box respectively; the inlet is sealed to the inlet pipe through an inlet threaded water pipe joint and an O-ring, and the outlet is covered with a screen and sealed to the outlet pipe through an outlet threaded water pipe joint and an O-ring.

[0015] A further technical solution of the present invention is: a liquid level adjustment component and an auxiliary water tank are provided on the outer side wall of the tank near the water outlet;

[0016] The liquid level adjustment component includes a through hole on its side wall, a baffle with a width larger than the through hole, and a sliding component for pressing and adjusting the position of the baffle relative to the through hole. The sliding component presses the baffle against the outside of the side wall near the outlet, and the area covered by the baffle in the through hole is changed by adjusting the pressing position of the baffle, thereby adjusting the liquid level. A rubber sheet is provided on the inner wall of the baffle for sealing contact between the baffle and the side wall.

[0017] The auxiliary water tank is used to hold the liquid flowing out from the through hole, and its outlet is located at the bottom of the tank.

[0018] A further technical solution of the present invention is: the sliding assembly includes an L-shaped plate, a square slider, and a screw. A groove is opened on one side of the L-shaped plate along the length direction. The slider is placed against the other side wall of the L-shaped plate. The screw passes through the groove and is screwed into the threaded hole of the slider. The position of the slider relative to the groove is limited by tightening the slider.

[0019] Two sets of sliding components are symmetrically installed on both sides of the through hole on the side of the container. The other side wall of the L-shaped plate is attached and fixed to the side of the container. The baffle is inserted between the two sliders and the other side wall of the two L-shaped plates. The baffle is pressed and fixed by the sliders. When it is necessary to adjust the position of the baffle, loosen the screws and slide the baffle. After determining the position, tighten the screws and sliders.

[0020] A method for stabilizing the flow of a water tank in a gravity-fed water tunnel, characterized by the following specific steps:

[0021] Water flows in from the inlet of the water tank, causing ripples on the liquid surface above the inlet and forming a water column between the inlet and the liquid surface. By placing a sponge component on the liquid surface above the inlet, the ripples on the liquid surface and the disturbance of the water column are eliminated.

[0022] The water flows from the inlet to the outlet, and the energy generated by the fluctuations is eliminated by the resistance module composed of perforated plates and bead-shaped resistance components.

[0023] When water flows out of the outlet, the vortex structure is disturbed by the screen, thereby maintaining the stability of the liquid surface, which completes the steady flow.

[0024] A further technical solution of the present invention is: when the water flows from the inlet to the outlet, it passes through a perforated plate - a bead-shaped resistance element stack - a perforated plate - a bead-shaped resistance element stack - a perforated plate in sequence.

[0025] Beneficial effects

[0026] The beneficial effects of this invention are as follows:

[0027] 1. This invention adopts passive control with coupling of resistance module and wave absorption module. By designing the two modules separately, the water tank achieves versatility. It does not require additional energy input, nor does it require thickening or selecting new materials to improve structural strength. It overcomes the shortcomings of the prior art, and is more practical and innovative with broad application prospects.

[0028] 2. The liquid surface at the inlet of the water tank in this invention exhibits the greatest fluctuation. Therefore, a sponge is placed above it to absorb the fluctuation. For the sponge, pores that are too small or too large will affect its energy absorption, causing the liquid to receive greater pressure, which in turn will have a greater impact on other areas of the liquid, resulting in even greater fluctuations. For the perforated plate, compared to not installing a perforated plate, the perforated plate, when present alone, can effectively reduce fluctuations by separating areas and filtering large-scale flow structures. Combined with the placement of the small balls and the sponge, the perforated plate also serves a load-bearing and supporting function. Since the function of the small holes on the plate is similar to that of the small balls, but their spatial distribution is much smaller, the influence of the pore size is no longer significant compared to not placing the small balls. The small balls mainly increase the internal resistance of the water tank, thereby consuming liquid energy and achieving stable flow. When their diameter is too small, the resistance will be too large, thus increasing liquid surface fluctuations; when their diameter is too large, the gaps increase and the resistance decreases, which will also increase liquid surface fluctuations.

[0029] When the liquid enters the tank, its significant fluctuations are first absorbed by the sponge. It then passes through a perforated plate into the area where the small balls are located. Here, the large-scale internal structure of the liquid is filtered by the gaps between the balls and the openings in the perforated plate. Finally, the liquid reaches the outlet, where a mesh screen further filters the large-scale structure, reducing fluctuations at the outlet. This three-part process effectively addresses the problem of water flow disturbance on the liquid surface at both the inlet and outlet of the tank.

[0030] 3. The components used in the resistance module and wave-absorbing module of this invention are simple to process and have low manufacturing costs.

[0031] 4. The present invention uses slots or the like to connect the additional structure to the water tank, which facilitates the installation and disassembly of the additional structure and allows for the selection of different structures and arrangements based on the characteristics of different liquids to achieve the maximum suppression effect.

[0032] 5. In this invention, the inlet water rate is greater than the outlet water rate, and the outlet water rate can be changed by adjusting the height of the slotted container to control the liquid level. Therefore, the container can be guaranteed to supply water continuously with a stable and adjustable speed. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the water tank structure for suppressing liquid level fluctuations according to the present invention;

[0034] Figure 2 This is a front view of the perforated plate of the present invention;

[0035] Figure 3 This is a front view of the side wall of the water tank near the outlet of the present invention;

[0036] Figure 4 This is a schematic diagram of the card slot structure of the present invention;

[0037] Figure 5This is a schematic diagram of the metal plate height adjustment and clamping device of the present invention;

[0038] Figure 6 This is a diagram showing the variation of liquid level fluctuations at the inlet and outlet of the present invention with the diameter of the small ball;

[0039] Figure 7 This is a diagram showing the variation of liquid level fluctuations at the inlet and outlet of the present invention with the pore size of the sponge.

[0040] Figure 8 This is a diagram showing the variation of liquid level fluctuations at the inlet and outlet of the present invention with the number of perforated plates;

[0041] Explanation of reference numerals in the attached diagram: 1-Inlet, 2-Sponge 1, 3-Top cover, 4-Sponge 2, 5-Perforated plate, 6-Glass bead, 7-Mesh screen, 8-Outlet, 9-Metal plate with rubber sheet attached, 10-Outlet of auxiliary water tank. Detailed Implementation

[0042] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] The existing passive control methods for suppressing liquid surface fluctuations within containers are mainly used for closed containers. These methods eliminate internal liquid fluctuations caused by the vibration of the container's carrier and cannot be used for stabilizing the flow in water tanks in water tunnel experiments. This invention provides a container for suppressing liquid surface fluctuations and a method for stabilizing the flow in a gravity-type water tunnel water tank. The container for suppressing liquid surface fluctuations includes a semi-closed container and a resistance module and a wave-absorbing module placed inside the container. The inlet and outlet of the semi-closed container are both located on the bottom surface of the container. The resistance module is set in the space inside the container between the inlet and outlet to reduce the flow velocity of the liquid in the container. The wave-absorbing module is placed at the top of the container and opposite the inlet to absorb the energy generated by the liquid fluctuations.

[0045] Specifically, the resistance module includes a perforated plate and bead-shaped resistance components. The space between the container inlet and outlet is divided into multiple spaces by multiple perforated plates, and several bead-shaped resistance components are installed in the space between adjacent perforated plates to generate resistance to the flow of liquid in the container from the inlet to the outlet.

[0046] Specifically, the diameter of the bead-shaped resistance element is greater than or equal to 2 cm.

[0047] Specifically, there are three perforated plates, which divide the container into four independent spaces. The two middle spaces are equipped with bead-shaped resistance components to form a resistance module.

[0048] Specifically, the wave-absorbing module includes a sponge assembly. The first sponge in the sponge assembly is located directly above the water inlet of the container, and the second sponge is located above the space adjacent to the water inlet. The first and second sponges are immersed below the liquid surface to eliminate the free liquid surface above the water inlet inside the container.

[0049] Specifically, the semi-enclosed container is a box structure with an open top, and the inlet and outlet are located at the two ends of the bottom plate of the box, respectively. The inlet is sealed to the inlet pipe through an inlet threaded water pipe joint and an O-ring, and the outlet is covered with a screen and sealed to the outlet pipe through an outlet threaded water pipe joint and an O-ring.

[0050] Specifically, a liquid level adjustment assembly and a secondary water tank are provided on the outer side wall of the tank near the water outlet;

[0051] The liquid level adjustment component includes a through hole on its side wall, a baffle with a width larger than the through hole, and a sliding component for pressing and adjusting the position of the baffle relative to the through hole. The sliding component presses the baffle against the outside of the side wall near the outlet, and the area covered by the baffle in the through hole is changed by adjusting the pressing position of the baffle, thereby adjusting the liquid level. A rubber sheet is provided on the inner wall of the baffle for sealing contact between the baffle and the side wall.

[0052] The auxiliary water tank is used to hold the liquid flowing out from the through hole, and its outlet is located at the bottom of the tank.

[0053] Specifically, the sliding assembly includes an L-shaped plate, a square slider, and a screw. A groove is formed along the length of one side of the L-shaped plate. The slider is placed against the other side wall of the L-shaped plate. The screw passes through the groove and is screwed into the threaded hole of the slider. Tightening the slider limits its position relative to the groove. Two sets of sliding assemblies are symmetrically installed on both sides of the through hole on the side of the container. The other side wall of the L-shaped plate is fixed to the side of the container. A baffle is inserted between the two sliders and the other side walls of the two L-shaped plates, and the baffle is pressed and fixed by the sliders. When it is necessary to adjust the position of the baffle, the screw is loosened, the baffle is slid, and after determining the position, the screw and slider are tightened.

[0054] The specific steps of the flow stabilization method for the gravity-type water tunnel upper water tank that can stabilize the flow are as follows:

[0055] Water flows in from the inlet of the water tank, causing ripples on the liquid surface above the inlet and forming a water column between the inlet and the liquid surface. By placing a sponge component on the liquid surface above the inlet, the ripples on the liquid surface and the disturbance of the water column are eliminated.

[0056] Water flows from the inlet to the outlet, where it passes through a resistance module consisting of a perforated plate and bead-shaped resistance components to eliminate the energy generated by the fluctuations. As the water flows from the inlet to the outlet, it passes through a perforated plate-bead-shaped resistance component stack-perforated plate-bead-shaped resistance component stack-perforated plate in sequence.

[0057] When water flows out of the outlet, the vortex structure is disturbed by the screen, thereby maintaining the stability of the liquid surface, which completes the steady flow.

[0058] This invention employs a passive control system that couples a resistance module and a wave-absorbing module. By designing the two modules separately, the water tank achieves versatility, eliminating the need for additional energy input or the need to thicken the structure or select new materials to improve structural strength. This overcomes the shortcomings of existing technologies, making it more practical, innovative, and promising for future applications.

[0059] The above technical solution will be further explained below with reference to the accompanying drawings:

[0060] Reference Figure 1 As shown, in this embodiment, the container for suppressing liquid level fluctuations is a gravity-type water tank, including an inlet 1, a first sponge 2, a top cover 3, a second sponge 4, a perforated plate 5, glass beads 6, a mesh screen 7, an outlet 8, a metal plate 9 with a rubber sheet attached, and a secondary water tank outlet 10. All components are fixed to the outer shell of the water tank. The inlet 1 and outlet 8 are both at the bottom. Horizontally, the components are arranged in the following order: inlet 1, perforated plate 5, glass beads 6, and mesh screen 7. Vertically, from bottom to top, they are sponges 2 and 4, and the top cover 3. The threaded water pipe connector at the inlet is fixed and sealed to the inlet using threads and O-rings. The top cover 3 is connected to the top of the water tank near the inlet via a vertical groove. The groove structure is as follows... Figure 4As shown. The sponge is glued to the top cover 3. Sponge 2 is located directly above the water outlet, and sponge 4 is located above the area adjacent to the water inlet. The main view of the perforated plate is shown below. Figure 2 As shown, it is inserted in Figure 4 The glass beads 6 are placed near the inlet and secured with two or three perforated plates. Their diameter, number, and placement can be adjusted according to the type of liquid. A mesh screen 7 covers the outlet and is welded to the water tank. The threaded water pipe connector 9 at the outlet is threaded and sealed with an O-ring.

[0061] Reference Figure 3 As shown, the water tank has an opening on its side wall at the outlet to control the liquid level. Slides are installed on both sides of the opening, and sliders and screws are mounted on these slides, as shown in the diagram. Figure 5 As shown, a metal plate with a rubber sheet attached to one side is pressed and fixed to the side wall opening by screws. The metal plate is welded to the bottom of the sliders on both sides. An auxiliary water tank is located outside the side wall opening, fixed to the side wall of the main water tank outlet by welding. The bottom of the auxiliary water tank has an opening and is connected and sealed to an O-ring via a threaded water pipe connector. In principle, the water surface near the inlet fluctuates too much, and a high water column easily forms directly above the inlet. Therefore, a thick sponge is installed above it. The sponge's porous structure absorbs the energy of the liquid surface fluctuations, significantly reducing the fluctuations. Glass beads increase flow resistance, thus slowing down the liquid flow. After passing through a large number of glass beads, the water flow becomes slower, avoiding fluctuations caused by high speed. The outlet opening easily generates vortices, causing the liquid level to be lower than other parts of the tank. Therefore, a screen is installed to disrupt the vortex structure and maintain a stable liquid surface. The side wall opening is used to control the water level and thus the speed. Since the inlet speed is greater than the outlet speed, an opening is placed in the side wall. The water level in the tank can be adjusted by loosening the screw, moving the slider, and then retightening the screw; the rubber sheet acts as a seal. Water flowing out of the side opening enters the auxiliary water tank and flows out from its bottom. In summary, this water tank can achieve a stable liquid level.

[0062] Test results:

[0063] To verify the current stabilization effect, according to Figure 1 A water tank with dimensions of 80×60×35cm was used for testing, with inlet and outlet diameters of 8cm and 4cm respectively. A ruler was attached to the wall to observe the liquid level. Different numbers of perforated plates, sponges with different pore sizes, and small balls of different diameters were added individually to measure the liquid level at the inlet and outlet. The side wall opening height was maintained at 20cm throughout the test.

[0064] Without any attachments, the water surface ripples the most at the inlet, with a ripple amplitude of 15cm, which is 75% of the liquid level. At the outlet, the ripple is about 8cm, which is about 40% of the liquid level. Figure 6 This indicates that the small ball can effectively stabilize the flow, but its diameter has little effect on the fluctuation of the liquid surface. Figure 7 The results show that the effect of the sponge pore size on suppressing liquid surface fluctuations at the outlet first increases and then decreases, therefore a sponge with a medium pore size (25 PPI) is used. Figure 8 This indicates that the perforated plate can effectively suppress liquid level fluctuations. Taking into account the suppression effect and the support and fixation of various structures in the water tank, three perforated plates are used.

[0065] In summary, using a 2cm diameter ball, installing three perforated plates, and arranging 25PPI sponges, the results show that after the combined arrangement of these three factors, the ripples at the inlet are completely absorbed by the sponges, and the ripples at the outlet are less than 1cm, demonstrating a significant suppression effect.

[0066] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled 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 principles and spirit of the present invention.

Claims

1. A container for suppressing liquid level fluctuations, characterized in that: The device includes a semi-enclosed container and a resistance module and a wave-absorbing module placed inside the container. The inlet and outlet of the semi-enclosed container are both located on the bottom surface of the container. The resistance module is set in the space inside the container between the inlet and outlet to reduce the flow velocity of the liquid in the container. The wave-absorbing module is placed at the top of the container and opposite to the inlet to absorb the energy generated by the liquid wave. The resistance module includes a perforated plate and bead-shaped resistance components. The space between the inlet and outlet of the container is divided into multiple spaces by multiple perforated plates, and several bead-shaped resistance components are installed in the space between adjacent perforated plates to generate resistance to the flow of liquid in the container from the inlet to the outlet. The wave-absorbing module includes a sponge assembly. The first sponge in the sponge assembly is located directly above the water inlet of the container, and the second sponge is located above the space adjacent to the water inlet. The first and second sponges are immersed below the liquid surface to eliminate the free liquid surface above the water inlet in the container.

2. The container for suppressing liquid level fluctuations according to claim 1, characterized in that: The diameter of the bead-shaped resistance element is greater than or equal to 2 cm.

3. The container for suppressing liquid level fluctuations according to claim 1, characterized in that: The container is divided into four independent spaces by three parallel perforated plates. The two middle spaces are equipped with bead-shaped resistance components, forming a resistance module.

4. The container for suppressing liquid level fluctuations according to claim 1, characterized in that: The semi-enclosed container is a box structure with an open top. The inlet and outlet are located at the two ends of the bottom plate of the box, respectively. The inlet is sealed to the inlet pipe through an inlet threaded water pipe joint and an O-ring. The outlet is covered with a screen and is sealed to the outlet pipe through an outlet threaded water pipe joint and an O-ring.

5. The container for suppressing liquid level fluctuations according to claim 4, characterized in that: The outer side wall of the tank near the outlet is equipped with a liquid level adjustment component and a secondary water tank; The liquid level adjustment component includes a through hole on its side wall, a baffle with a width larger than the through hole, and a sliding component for pressing and adjusting the position of the baffle relative to the through hole. The sliding component presses the baffle against the outside of the side wall near the outlet, and the area covered by the baffle in the through hole is changed by adjusting the pressing position of the baffle, thereby adjusting the liquid level. A rubber sheet is provided on the inner wall of the baffle for sealing contact between the baffle and the side wall. The auxiliary water tank is used to hold the liquid flowing out from the through hole, and its outlet is located at the bottom of the tank.

6. The container for suppressing liquid level fluctuations according to claim 5, characterized in that: The sliding assembly includes an L-shaped plate, a square slider, and a screw. A groove is formed on one side of the L-shaped plate along the length direction. The slider is placed against the other side wall of the L-shaped plate. The screw passes through the groove and is screwed into the threaded hole of the slider. Tightening the slider limits the position of the slider relative to the groove. Two sets of sliding components are symmetrically installed on both sides of the through hole on the side of the container. The other side wall of the L-shaped plate is attached and fixed to the side of the container. The baffle is inserted between the two sliders and the other side wall of the two L-shaped plates. The baffle is pressed and fixed by the sliders. When it is necessary to adjust the position of the baffle, loosen the screws and slide the baffle. After determining the position, tighten the screws and sliders.

7. A method for stabilizing the flow of a gravity-fed water tank in a water tunnel, wherein the water tank comprises the container for suppressing liquid level fluctuations as described in any one of claims 1-6; characterized in that... The specific steps are as follows: Water flows in from the inlet of the water tank, causing ripples on the liquid surface above the inlet and forming a water column between the inlet and the liquid surface. By placing a sponge component on the liquid surface above the inlet, the ripples on the liquid surface and the disturbance of the water column are eliminated. The water flows from the inlet to the outlet, and the energy generated by the fluctuations is eliminated by the resistance module composed of perforated plates and bead-shaped resistance components. When water flows out of the outlet, the vortex structure is disturbed by the screen, thereby maintaining the stability of the liquid surface, which completes the steady flow.

8. The flow stabilization method for a gravity-type water tank in a water tunnel according to claim 7, characterized in that: As the water flows from the inlet to the outlet, it passes through a perforated plate, a bead-shaped resistance element stack, another perforated plate, another bead-shaped resistance element stack, and another perforated plate in sequence.

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