A variable angle of attack dike simulation scour test flume device

Abstract

The utility model discloses a dike simulation scour test water tank device of variable top angle of attack, include: water tank, one end sets up water inlet connection water supply unit, the other end sets up water outlet connection backwater, and the water tank is close to the sand trap of setting the water outlet end on, and the block is set up in the water tank inside, and is located between the water inlet and sand trap, and the side of face A of close water inlet sets up the opening, and has the cavity in, and the model dike is placed in the cavity, the block can rotate in the water tank, with the adjustment water flow top angle of attack, camera, set up in the water tank outside, to shoot the breach process of dike when different water flow top angle of attack. The utility model can solve the problem of the limitation of the existing dike scour test device top angle of attack adjustment, the limitation of observation visual angle misalignment.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic engineering model experiment, specifically relating to a levee scour simulation test flume with a variable top impact angle. Background Technology

[0002] River levees are water-retaining structures built along rivers, canals, lakes, coastlines, or the edges of floodplains. As core infrastructure for flood control, their erosion resistance directly impacts the safety of people's livelihoods. While the risk of overtopping and breaching has been effectively controlled through standardized construction of existing levee projects, the risk of levee erosion and breach still exists. Existing research indicates that the angle of impact is a key hydrodynamic parameter affecting levee erosion, influencing the erosion failure mode and the erosion development process by altering the near-levee velocity field distribution.

[0003] Current research on the process and mechanism of levee breaching mainly relies on fixed top-angle test devices, which have the following drawbacks: First, due to the limitations of the flume structure, it is impossible to construct continuously adjustable dynamic top-angle test conditions; second, traditional angle adjustment requires manual disassembly and reassembly of test components, resulting in low accuracy of repeated positioning and high time consumption; third, the non-linked design of the observation system and model angle causes asynchronous observation perspective deviation and image distortion errors, which directly affect the observation accuracy.

[0004] Therefore, there is an urgent need to develop a scour test device with a precisely adjustable top scour angle and synchronous observation function. Through this device, we can conduct tests on the scour process of dikes, study the "erosion-deformation-breakdown" process of model dikes under different near-dike flow velocities and different scour angles, propose the critical flow conditions for dike scour, and reveal the formation mechanism of dike scour risk. Utility Model Content

[0005] The purpose of this invention is to provide a flume device for simulating scour testing of dikes with a variable top impact angle, thereby solving the limitations of existing dike scour testing devices, such as limited adjustment of the top impact angle and inaccurate observation angle.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a water tank device for simulating scour testing of dikes with a variable top impact angle, comprising:

[0007] The water tank has an inlet at one end connected to the water supply unit and an outlet at the other end connected to the return water. A sedimentation tank is set on the water tank near the outlet.

[0008] A baffle is set inside the water tank and located between the water inlet and the sedimentation tank. An opening is provided on the side A near the water inlet, and a cavity is provided inside. A model embankment is placed in the cavity. The baffle can rotate inside the water tank to adjust the angle of the water flow.

[0009] A camera, positioned outside the water tank, is used to film the breaching process of the levee as the water flow surges at different angles.

[0010] Furthermore, the stop block is made of transparent material and is a column with a quarter-sector shape when viewed from above; a waterstop is provided between the model embankment and the inner wall of the cavity of the stop block to prevent water from entering the cavity; an opening is provided on one side of the wall of the water tank, and the spindle at the center of the sector-shaped column is connected to one side of the opening via a rotating shaft, on which an angle adjustment device is connected.

[0011] When the stop block rotates horizontally around the pivot in the water tank, the arc surface of the column can maintain a water seal with the other side of the opening.

[0012] Furthermore, the angle adjustment device includes:

[0013] The turntable is connected to the lower part of the shaft;

[0014] The turntable is connected to the turntable via a gear transmission mechanism, and an operating rocker arm is mounted on the turntable.

[0015] Furthermore, a reduction gearbox is provided between the rotating shaft and the turntable. The input end of the reduction gearbox is coaxially connected to the output shaft of the rotating shaft through a flexible coupling, and the output end of the reduction gearbox is connected to the main shaft of the turntable through a spline sleeve to form a torque transmission fit.

[0016] Furthermore, the camera is connected to the rotating shaft via a support rod, which is telescopic and connected to a liftable support platform. The camera is mounted on the support platform to ensure that the viewing angle of the camera device is synchronized with the rotation angle of the dike.

[0017] Furthermore, the top of the column is provided with a corner angle scale line.

[0018] Furthermore, a flow stabilizer plate is installed inside the water tank at the water inlet.

[0019] Furthermore, the water tank is equipped with a tailgate for adjusting the water level, which is installed between the sedimentation tank and the outlet.

[0020] Furthermore, the side walls and bottom of the water tank are made of 5mm thick transparent plexiglass.

[0021] Furthermore, the water supply unit includes a water tank, which is connected to a water tank pipe, and a valve is installed on the pipe;

[0022] The return water includes a water storage tank, which is connected to a water tank pipe;

[0023] The water tank is connected to the water storage tank by a pipeline, and a water pump is installed on the pipeline.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] First, this utility model can adjust the angle of the dike, thereby achieving precise changes in the angle of water flow impact. It can study the dike breaching process under different water flow impact angles, and can better simulate various situations of actual water flow contacting the dike. It breaks through the limitation of traditional flume equipment that can only conduct single-angle tests, and has higher test flexibility and applicability.

[0026] Secondly, the design of the quarter-sector column embankment scour zone allows for smooth adjustment of the rotation angle, ensuring that the model embankment can rotate smoothly within its maximum angle. This simulates the embankment breach process under conditions of water flow surging against the embankment and flood discharge along the embankment. Simultaneously, due to the geometric characteristics of the cylinder, the contact surface exhibits less friction, reducing wear caused by friction and enabling precise angle control.

[0027] Third, by connecting the camera device to the rotating shaft via a support rod, the camera's viewing angle can be synchronized with the dike's rotation angle, ensuring consistent observation angles across different experiments. This provides accurate and consistent data recording, guaranteeing the reliability of the experiments. Furthermore, the fixed design of the camera device avoids the tedious operation of constantly adjusting the camera's position during experiments, reducing human interference and making the experiments more efficient.

[0028] Fourth, the structure of this utility model is simple and easy to adjust, which can facilitate multiple tests and save modification time, reduce the complexity and cycle of experiments, and save researchers a lot of time and costs. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] Figure 2 This is a schematic cross-sectional view of the stop block of this utility model;

[0031] Figure 3 , 4 5 are top views of the embankment scour area at different rotation angles according to this utility model;

[0032] Figure 6 This is a side view of the embankment erosion area and the linked camera device of this utility model;

[0033] Among them: 1-Water tank, 2-Block, 2-1, Surface A, 3-Rotating shaft, 4-Turntable, 5-Turntable, 6-Rock arm, 7-Support rod, 8-Bracket platform, 9-Camera, 10-Reservoir, 11-Valve, 12-Flange, 13-Flow stabilizer, 14-Sedimentation tank, 15-Tailgate, 16-Water pipe, 17-Water storage tank, 18-Gearbox, 19-Scale line, 20-Water pump, 21-Model embankment, 22-Waterstop. Detailed Implementation

[0034] A flume device for simulating scour of a dike with a variable apex angle includes:

[0035] Water tank 1 is a rectangular water tank with 5mm thick transparent plexiglass side walls and bottom. One end is set with an inlet to connect to the water supply unit, and the other end is set with an outlet to connect to the return water. A sedimentation tank 14 is set near the outlet end, and an opening is set on the side to fit the size of the baffle 2.

[0036] The baffle 2 is made of transparent material and is a column with a quarter-fan shape when viewed from above. An opening is provided on the side A2-1 near the water inlet, and there is a cavity inside. A model embankment 21 is placed in the cavity. A waterstop 22 is provided between the model embankment 21 and the inner wall of the cavity of the baffle 2 to prevent water from entering the cavity. Angle scale lines 19 are provided.

[0037] A rotating shaft 3 is coaxially arranged at the central axis, and the rotating shaft 3 is located on the side of the water tank 1; the rotating shaft 3 is mechanically coupled to the angle adjustment device.

[0038] The angle adjustment device includes: a turntable 4 connected to the lower part of the rotating shaft 3; a turntable 5, which is linked to the turntable 4 through gears; an operating rocker arm 6 is mounted on the turntable 5, and the rotating shaft 3 can be rotated by shaking the operating rocker arm 6; a reduction gearbox 18 is provided between the rotating shaft 3 and the turntable 5. The reduction gearbox 18 adopts a flange-type two-stage installation. The input end is coaxially connected to the output shaft of the rotating shaft 3 through a flexible coupling. The output end of the reduction gearbox 18 forms a torque transmission fit with the main shaft of the turntable 5 through a spline sleeve.

[0039] Camera 9 is connected to the rotating shaft 3 via a support rod 7. The support rod 7 is telescopic and connected to a liftable support platform 8, on which camera 9 is mounted.

[0040] The water supply unit includes a water tank 10, which is connected to a water trough 1 via a pipe, and a valve 11 is installed on the pipe. The return water unit includes a water storage tank 17, which is connected to the water trough 1 via a pipe. The water tank 10 is connected to the water storage tank 17 via a pipe, and a water pump 20 is installed on the pipe.

[0041] The water tank 1 is equipped with a flow stabilizer 13 installed at the water inlet. The water tank 1 is also equipped with a tailgate 15 installed at the water outlet to regulate the water level.

[0042] This utility model provides a levee scour simulation test flume with a variable top impact angle, and the experimental method is as follows:

[0043] After placing the model embankment in the embankment placement area of ​​the block cavity, rotate the block to the corresponding angle using the rotating shaft of the turntable according to the required jacking angle reference scale line. After fixing the angle, seal the joint between the arc surface and the side wall of the water tank with glass glue to prevent water leakage. Then turn on the camera device, set the relevant parameters, and record the video. At this time, turn on the water supply module to start working, turn on the water pump and control the test flow rate. Control the test water level and jacking flow rate through the flow stabilizer plate. The water flow impacts the block, and part of the water flow washes over the model embankment. Then, together with the other part of the water flow, it enters the circulation device of the water tank. The washed-down soil flows into the sedimentation tank. After the experiment, collect the soil. Stop the experiment when a large area of ​​damage to the model embankment is observed.

Claims

1. A flume device for simulating scour of a dike with a variable top impact angle, characterized in that, include: The water tank (1) has an inlet at one end connected to the water supply unit and an outlet at the other end connected to the return water. A sedimentation tank (14) is set on the water tank near the outlet. The baffle (2) is set inside the water tank and is located between the water inlet and the sedimentation tank (14). The side A (2-1) near the water inlet has an opening and a cavity. A model embankment (21) is placed inside the cavity. The baffle (2) can rotate inside the water tank to adjust the angle of the water flow. A camera (9) is set outside the water tank to capture the process of the levee breaking when the water flow hits at different angles.

2. The levee scour simulation test flume device with variable apex angle according to claim 1, characterized in that, The baffle (2) is made of transparent material and is a column with a quarter-fan shape when viewed from above; a waterstop (22) is provided between the model embankment (21) and the inner wall of the cavity of the baffle (2) to prevent water from entering the cavity; an opening is provided on one side of the wall of the water tank (1), and the spindle where the center of the fan-shaped column is located is connected to one side of the opening through a rotating shaft (3), and an angle adjustment device is connected to the rotating shaft (3); When the stop block (2) rotates horizontally around the pivot (3) in the water tank, the arc surface of the column can maintain a water seal with the other side of the opening.

3. The levee scour simulation test flume device with variable apex angle according to claim 2, characterized in that, The angle adjustment device includes: The turntable (4) is connected to the lower part of the rotating shaft (3); The turntable (5) is connected to the turntable (4) via a gear transmission mechanism, and an operating rocker arm (6) is installed on the turntable (5).

4. The levee scour simulation test flume device with variable apex angle according to claim 3, characterized in that, A reduction gearbox (18) is provided between the rotating shaft (3) and the turntable (5). The input end of the reduction gearbox (18) is coaxially connected to the output shaft of the rotating shaft (3) through an elastic coupling. The output end of the reduction gearbox (18) is connected to the main shaft of the turntable (5) through a spline sleeve to form a torque transmission fit.

5. The levee scour simulation test flume device with variable apex angle according to claim 2, characterized in that, The camera (9) is connected to the rotating shaft (3) via a support rod (7). The support rod (7) is telescopic and connected to a liftable support platform (8). The camera (9) is mounted on the support platform (8) to achieve synchronization between the viewing angle of the camera device and the rotation angle of the dike.

6. The levee scour simulation test flume device with variable apex angle according to claim 2, characterized in that, The top of the column is provided with a corner angle scale line (19).

7. The levee scour simulation test flume device with variable apex angle according to claim 1, characterized in that, The water tank (1) is equipped with a flow stabilizer plate (13) installed at the water inlet.

8. The levee scour simulation test flume device with variable apex angle according to claim 1, characterized in that, The water tank (1) is equipped with a tailgate (15) for adjusting the water level, which is installed between the sedimentation tank (14) and the outlet.

9. The levee scour simulation test flume device with variable apex angle according to claim 1, characterized in that, The side walls and bottom of the water tank (1) are made of 5mm thick transparent organic glass.

10. The levee scour simulation test flume device with variable apex angle according to claim 1, characterized in that, The water supply unit includes a water tank (10), which is connected to the water tank (1) by a pipe, and a valve (11) is installed on the pipe. The return water includes a water storage tank (17), which is connected to the water tank (1) by a pipe; The water tank (10) is connected to the water storage tank (17) by a pipeline, and a water pump (20) is installed on the pipeline.

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