CN110763426A - Method and device for simulating rip current in a pool - Google Patents

Abstract

The invention belongs to the technical field of fluid mechanics of dragging pools, and in particular relates to a method and a device for simulating offshore flow in a pool, which consists of a lower bracket, a liftable hydraulic expansion device, a middle concave inclined plate, a connecting device, an upper bracket and bolts , the upper surface of the lower bracket is fixed with a liftable hydraulic expansion device, one end of the middle concave inclined plate is hinged with the lower bracket, and the lower surface of the middle depressed inclined plate is fixed with the upper part of the liftable hydraulic expansion device. At the same time, a bracket perpendicular to the lower bracket is fixed at one end of the lower bracket away from the hinged with the middle concave inclined plate. The present invention is simple in structure, easy to install, and can realize the simulation of the offshore current. The device can satisfy the size of the offshore current in different degrees, can carry out controllable research on the offshore current, and can better study the velocity and flow of the offshore current. Field characteristics, using PIV fluid testing technology to test and study the fine flow field of the rip current.

Description

Method and device for simulating rip current in a pool

technical field

The invention belongs to the technical field of fluid mechanics of dragging pools, and in particular relates to a method and a device for simulating offshore flow in a pool.

Background technique

Rip currents are common in the sea, and the existence of rip currents brings danger to people on the shore. The so-called rip current, also known as the rip current, is a narrow and strong jet-like current that flows out to the sea in a direction perpendicular or nearly perpendicular to the coast. Danger to life by entering the sea. The offshore current has been studied before, and the performance prediction and safety rescue of the offshore current have been carried out. In order to study the flow state of the offshore current and the motion mechanism of the fluid more accurately, the fine flow field analysis of the offshore current is carried out, and each part is analyzed. It is necessary to carry out control research in the experimental pool to study the hazards of rip currents in different states, so as to well solve the hazards caused by rip currents and forecast rip currents.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for simulating rip current and an experimental device for testing rip current in a pool.

A device for simulating off-shore flow in a pool is composed of a lower bracket 1, a liftable hydraulic expansion device 2, a middle concave inclined plate 3, a connecting device 4, an upper bracket 5, and a bolt 6. The upper surface of the lower bracket 1 is fixed with The liftable hydraulic expansion device 2, one end of the middle concave inclined plate 3 is hinged with the lower bracket 1, the lower surface of the middle depressed inclined plate 3 is fixed with the upper part of the liftable hydraulic expansion device 2, A bracket perpendicular to the lower bracket 1 is fixed at one end of the lower bracket 1 away from hinged with the middle concave inclined plate 3 , the bracket and the connecting device 4 are fixed together by bolts 6 , and the connecting device 4 and the upper bracket 5 are fixed together.

The length of the connecting means 4 can be adjusted.

A method for simulating rip current in a pool, comprising the following steps:

(1) A device for simulating rip current of a pool is installed on the central side bridge of the trailer;

(2) Adjust the connecting device so that the waves caused can rush to the inclined plate;

(3) Adjust the liftable hydraulic telescopic device to change the different inclination of the inclined plate;

(4) Spread colored particles on the inclined plate;

(5) Start the wave generator on the other side of the pool, input waves of different amplitudes and wavelengths, the resulting waves hit the inclined plate, and the waves on the inclined plate converge to the low-lying part of the inclined plate to form a rapid return flow. into the pool.

The beneficial effects of the present invention are:

The present invention is simple in structure, easy to install, and can realize the simulation of the offshore current. The device can satisfy the size of the offshore current in different degrees, can carry out controllable research on the offshore current, and can better study the velocity and flow of the offshore current. Field characteristics, using PIV fluid testing technology to test and study the fine flow field of the rip current.

Description of drawings

Figure 1 is the general layout of the simulated rip current test device;

Fig. 2 is the front view of the connection device connecting the upper and lower brackets;

Figure 3 is a side view of the connecting device connecting the upper and lower brackets

Fig. 4 is the left side view of the simulation offshore current test device;

Figure 5 is a top view of the middle low concave inclined plate.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings.

The purpose of the present invention is to provide a method and an experimental device for simulating offshore rip currents in a towing pool. The device includes: an upper bracket 5 , a connecting device 4 , 8 bolts 6 , a lower bracket 1 , a liftable hydraulic expansion device 2 and a concave sloping plate 3 in the middle. When simulating the rip current in the towing pool, first install the device on the central side bridge of the trailer, start the wave maker on the other side of the pool, input waves of different amplitudes and wavelengths, and the resulting waves hit the inclined board , the wave flow on the inclined plate converges to the low-lying part of the inclined plate to form a backflow, and the backflow quickly returns to the pool, thereby realizing the simulation of rip current.

The device can change the inclination of the inclined plate through a liftable hydraulic expansion device, thereby changing the speed of the return flow. By spreading colored particles on the inclined plate, the flow state and flow characteristics of the liquid can be observed. Flow velocity and flow field are analyzed and measured.

The inclined plate and the lower bracket are hinged, and the low concave inclined plate in the middle is used to allow the waves on the inclined plate to converge here, thereby forming a fast-flowing backflow.

The hydraulic drive drives the lifting and lowering of the telescopic rod, thereby changing the inclination of the inclined plate, thereby changing the flow rate of the return flow.

The distance to the water surface can be adjusted through the connecting device 4 to ensure the flexibility of the device so that it is not limited by the height of the water surface of the pool as much as possible. The device can change the inclination of the inclined plate through a liftable hydraulic expansion device, thereby changing the speed of the return flow. By spreading colored particles on the inclined plate, the flow state and flow characteristics of the liquid can be observed. Flow velocity and flow field are analyzed and measured.

The concave sloping plate in the middle is hinged with the lower bracket, and the waves on the sloping plate are gathered here by using the concave sloping plate in the middle, so as to form a backflow with a fast flow velocity, which is used to simulate the offshore current. The essential.

The liftable hydraulic telescopic device drives the lifting and lowering of the telescopic rod through hydraulic drive, thereby changing the inclination of the inclined plate, thereby changing the flow rate of the return flow.

First install the device on the central side bridge of the trailer, fix the upper bracket 1 to ensure the stability of the device during the test, and fix the lower bracket through the connecting device Figure 2 and 8 bolts. The concave inclined plate is hinged with the lower bracket, so that the inclined plate can be tilted at different inclination angles through the liftable hydraulic telescopic device. Before the test, the device is adjusted to ensure that the waves caused can rush to the inclined plate. Different heights can be adjusted by adjusting the connecting device 4 or the height of the central side bridge of the trailer can be adjusted directly.

During the test of simulating the offshore rip current, the test equipment was installed and debugged, and the wave generator was started to input waves of different amplitudes and wavelengths. The resulting waves hit the inclined plate, and the waves on the inclined plate flowed to the low-lying plate At the same time, it converges to form a backflow, and the backflow quickly returns to the pool, thereby realizing the simulation of rip current. It is also possible to change the different inclinations of the inclined plate and the wave amplitude and wave height to change the rip current of different degrees, and then study the harm caused by the non-stop rip current. The flow field observation of the water flow can be observed by scattering colored particles, sprinkle the colored particles on the inclined plate to observe the flow direction of the flowing liquid, and use the PIV test technology to conduct a fine flow field analysis of the rip current. The test of the rip current in the experiment can achieve a certain degree of artificial controllability, and can more accurately measure the flow field characteristics of the rip current, and conduct a special study on a dangerous working condition.

Claims (3)

1. A device for simulating rip current in a pool, comprising a lower support (1), a liftable hydraulic expansion device (2), a concave inclined plate (3) in the middle, a connecting device (4), and an upper support (5) and bolts (6), characterized in that: the upper surface of the lower bracket (1) is fixed with a liftable hydraulic expansion device (2), and one end of the middle low concave inclined plate (3) is hinged with the lower bracket (1). , the lower surface of the middle concave inclined plate (3) is fixed with the upper part of the liftable hydraulic expansion device (2), and the lower bracket (1) is fixed away from the hinged end of the middle concave inclined plate (3) There is a bracket perpendicular to the lower bracket (1), the bracket and the connecting device (4) are fixed together by bolts (6), and the connecting device (4) and the upper bracket (5) are fixed together. 2. A device for simulating offshore flow in a pool according to claim 1, characterized in that the length of the connecting device (4) can be adjusted. 3. a method for simulating rip current in a pool, is characterized in that, comprises the following steps: (1) A device for simulating rip current of a pool is installed on the central side bridge of the trailer; (2) Adjust the connecting device so that the waves caused can rush to the inclined plate; (3) Adjust the liftable hydraulic telescopic device to change the different inclination of the inclined plate; (4) Spread colored particles on the inclined plate; (5) Start the wave generator on the other side of the pool, input waves of different amplitudes and wavelengths, the resulting waves hit the inclined plate, and the waves on the inclined plate converge to the low-lying part of the inclined plate to form a rapid return flow. into the pool.

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