A wave-breaking impeller assembly, device and method for rapidly breaking internal waves

Abstract

The application discloses a wave-eliminating impeller assembly, a device and a method for quickly eliminating internal waves, and belongs to the technical field of wave-eliminating impeller assemblies and devices. The wave-eliminating impeller assembly comprises coaxially arranged driving impellers and wave-eliminating impellers, the driving impellers and the wave-eliminating impellers are vertically arranged in the water body in a manner perpendicular to the transmission direction of internal waves, the driving impellers are driven to rotate by the internal waves in the water body, and the wave-eliminating impellers are driven to rotate by the driving impellers, the rotating of the wave-eliminating impellers generates a vertical broken internal wave ordered flow field, and the wave-eliminating purpose is achieved. The wave-eliminating impeller assembly and the device have the technical advantages that energy dissipation of internal waves is faster, the efficiency of eliminating internal waves is higher, and the disturbance to the density stratification of the water body is smaller.

Description

TECHNICAL FIELD

[0001] The application discloses a wave-eliminating impeller assembly and device capable of eliminating internal waves in a laboratory and a method for rapidly eliminating internal waves. BACKGROUND

[0002] In recent years, with the continuous deepening of the country's ocean development, various marine engineering constructions are in full swing, and the importance of underwater vehicles is increasingly highlighted. Laboratories pay more attention to the study of internal waves that affect the safety of marine engineering structures and underwater vehicles. It is of great significance to improve the test efficiency by rapidly eliminating the wave motion after the internal waves are generated in the laboratory.

[0003] At present, the wave-eliminating devices used in laboratories mainly include inclined surface wave-eliminating devices and wedge-shaped wave-eliminating devices. The internal waves are broken by using the uplift effect and compression effect of the terrain to achieve the purpose of wave elimination. However, this method takes a long time to eliminate waves, especially in some large stratified flow tanks, which greatly affects the experimental research efficiency.

[0004] A patent with publication number CN109323846A discloses a impeller type wave-eliminating and rectifying device, which is composed of a panel, a deceleration array, a flow splitting protrusion, a wave breaking frame, an energy consuming impeller and a backflow pipeline. The panel is arranged in an inclined manner, and the surface of the panel is provided with the deceleration array, the flow splitting protrusion and the wave breaking frame. The deceleration array is composed of ellipsoidal pits and protrusions. The flow splitting protrusion is arranged between the wave breaking frames in an ellipsoidal shape. The wave breaking frame is arranged above the inlet of the backflow pipeline in a grid shape. The energy consuming impeller is installed at the inlet of the backflow pipeline and can rotate freely. The cross section of the backflow pipeline is a regular quadrilateral.

[0005] The above patent mainly solves the surface wave of the water body, and it cannot eliminate the internal wave. The density jump layer is generated in the water body due to uneven distribution of density. The internal wave is generated after the density jump layer is disturbed. The restoring force is extremely weak, about 0.1% of the surface wave, and the wave amplitude can reach hundreds of meters. Therefore, the wave flow field is larger than the surface wave range, and there is obvious shear flow above and below the density jump layer. The impeller type wave-eliminating and rectifying device disclosed in the above patent utilizes the wave surface flow from one side to impact the impeller to dissipate energy. However, the flow field exists above and below the wave surface. The device cannot work in the internal wave flow field. SUMMARY

[0006] In order to overcome the problems of long time and low efficiency of internal wave elimination in a large stratified flow tank in a laboratory, and follow the principles of simple structure, safe and convenient operation, the application provides a wave-eliminating impeller assembly and device capable of eliminating internal waves in a laboratory and a method for rapidly eliminating internal waves. The wave-eliminating impeller assembly utilizes the internal wave to drive the impeller, drives the wave-eliminating impeller to rotate to generate vertical broken water internal wave ordered flow field, and achieves the technical purpose of rapidly eliminating the water internal wave.

[0007] In order to achieve the above technical purposes, the present application adopts the following technical solutions:

[0008] A wave elimination impeller assembly comprises coaxially arranged driving impellers and wave elimination impellers, the driving impellers and wave elimination impellers are vertically arranged in a water body in a manner perpendicular to the direction of internal wave transmission, the driving impellers are driven to rotate by the internal waves in the water body to drive the wave elimination impellers to rotate, the rotation of the wave elimination impellers generates a vertical broken internal wave ordered flow field, and the wave elimination purpose is achieved.

[0009] The wave elimination impeller assembly comprises one driving impeller and two wave elimination impellers, and the two wave elimination impellers are symmetrically arranged at the front and rear ends of the driving impeller.

[0010] The present application further discloses an experimental device suitable for internal waves in a large-scale layered water tank laboratory, which comprises:

[0011] The bearing frame and the impeller mounting frame are provided, the impeller mounting frame comprises multiple rows, the multiple rows of impeller mounting frames are arranged side by side on the bearing frame in a horizontal direction, each row of impeller mounting frames can rotate relative to the bearing frame, and the wave elimination impeller assembly is mounted on each row of impeller mounting frames.

[0012] Multiple wave elimination impeller assemblies are mounted side by side on each row of impeller mounting frames, and the plane where the blades of the wave elimination impeller are located is perpendicular to the direction of internal wave transmission.

[0013] The bearing frame is a rectangular frame structure, after the bearing frame is placed in the large-scale layered water tank, the bottom edge of the bearing frame is parallel to the tank bottom of the large-scale layered water tank, the multiple rows of impeller mounting frames are respectively parallel to the water surface, and the side edges of the bearing frame abut against the tank side walls of the large-scale layered water tank.

[0014] A method suitable for rapidly eliminating internal waves in a large-scale layered water tank is based on the experimental device suitable for internal waves in a large-scale layered water tank laboratory, and comprises the following steps:

[0015] S1, the bearing frame is placed in the large-scale layered water tank at an inclined angle, at least one row of impeller mounting frames is submerged in water, the maximum diameter of the impeller is D, the thickness of the impeller is m, and the spacing between the impeller mounting frames is , at this time, the included angle formed by the plane where the bearing frame is located and the plane where the tank bottom is located is , wherein ;

[0016] S2, the impeller mounting frame rotates relative to the bearing frame under the action of its own gravity, so that the driving impellers and wave elimination impellers are vertically arranged in the water body in a manner perpendicular to the direction of internal wave transmission;

[0017] S3, the water body wave drive said drive impeller rotation drive said wave breaking impeller rotation, the wave breaking impeller rotation generates vertical broken internal wave ordered flow field, achieves the purpose of wave breaking.

[0018] Beneficial effects:

[0019] The present application makes full use of the internal wave flow field drive impeller drive broken impeller rotation generates vertical to internal wave flow field disturbance makes it form turbulent flow, compared with the prior art wave breaking device:

[0020] 1. The impeller structure generates more turbulent flow, and the energy dissipation of the internal wave is faster, and the efficiency of eliminating the internal wave is higher.

[0021] 2. Since the turbulent flow is generated between adjacent impellers, the disturbance to the density stratification of the water body is smaller, and it is more conducive to the continuation of the experiment. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a perspective view of the wave breaking impeller assembly of the present application;

[0023] Figure 2 It is a front view of Figure 1 ;

[0024] Figure 3 It is a side view of Figure 1 ;

[0025] Figure 4 It is a structural schematic diagram of installing the wave breaking impeller assembly on the impeller mounting frame;

[0026] Figure 5 It is a structural schematic diagram of the experimental device suitable for large-scale stratified water tank internal wave;

[0027] Figure 6 It is a wave breaking principle diagram of the present application;

[0028] Wherein, 1 is a bearing frame; 2 is a wave breaking impeller assembly; 3 is an impeller mounting frame; 4 is a high-density liquid; 5 is a low-density liquid; 6 is a density boundary layer. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be further described in detail below in combination with the drawings in the specification and specific embodiments.

[0030] Embodiment 1

[0031] As shown in Figure 1 , a wave breaking impeller assembly, comprising coaxially arranged drive impeller and wave breaking impeller, the drive impeller and wave breaking impeller are floating in the water body in a way perpendicular to the internal wave transmission direction, the water body wave drive said drive impeller rotation drive said wave breaking impeller rotation, the wave breaking impeller rotation generates vertical broken internal wave ordered flow field, achieves the purpose of wave breaking.

[0032] As a preferred embodiment of the wave-breaking impeller assembly of the present application, considering that the internal wave will be reflected after hitting the tank wall, the wave-breaking impeller comprises two, two wave-breaking impellers symmetrically arranged at the front and rear ends of the driving impeller.

[0033] Embodiment 2

[0034] As shown in Figure 3 , the present application further discloses an experimental device suitable for internal wave in a large stratified tank laboratory, the difference from embodiment 1 is that it comprises:

[0035] The carrier frame and the impeller mounting frame, the impeller mounting frame comprises multiple rows of impeller mounting frames arranged side by side on the carrier frame, and each row of impeller mounting frames can rotate relative to the carrier frame, and the wave-breaking impeller assembly is installed on each row of impeller mounting frames.

[0036] As a further preferred embodiment of the technical solution of embodiment 2, multiple wave-breaking impeller assemblies are installed side by side on each row of impeller mounting frames, and the plane where the blades of the wave-breaking impeller are located is perpendicular to the transmission direction of the internal wave.

[0037] The carrier frame is a rectangular frame structure, after the carrier frame is placed in the large stratified tank, the bottom edge of the carrier frame is parallel to the tank bottom of the large stratified tank, multiple rows of impeller mounting frames are respectively parallel to the water surface, and the side edges of the carrier frame are in abutment with the tank side walls of the large stratified tank.

[0038] A method for quickly eliminating internal wave suitable for a large stratified tank, using the above-mentioned experimental device suitable for internal wave in a large stratified tank laboratory, comprising the following steps:

[0039] S1, place the carrier frame in the large stratified tank at an inclined angle, at least one row of the impeller mounting frames is submerged in water, the maximum diameter of the impeller is D, the thickness is m, and the spacing between the impeller mounting frames is , at this time, the angle formed by the plane where the carrier frame is located and the plane where the tank bottom is located is , wherein ;

[0040] S2, the impeller mounting frame rotates relative to the carrier frame under the action of the gravity of the impeller mounting frame and the wave-breaking impeller assembly, so that the driving impeller and the wave-breaking impeller are floating in the water body in a manner perpendicular to the transmission direction of the internal wave; the central axis of the impeller in the wave-breaking device always remains horizontal, thereby improving the efficiency of absorbing internal wave energy;

[0041] S3, the driving impeller is driven to rotate by the internal wave in the water body, which drives the wave-breaking impeller to rotate, the wave-breaking impeller rotating generates a vertical broken internal wave ordered flow field, thereby achieving the purpose of wave breaking.

Claims

1. An experimental device for internal waves in a large stratified water tank laboratory, characterized in that: include: A carrier frame and an impeller mounting frame, wherein the impeller mounting frame includes multiple rows, and the multiple rows of impeller mounting frames are arranged side by side on the carrier frame in a horizontal direction, and each row of impeller mounting frames can rotate relative to the carrier frame, and a wave-breaking impeller assembly is installed on each row of impeller mounting frames, and the wave-breaking impeller assembly includes a coaxially arranged driving impeller and a wave-breaking impeller, and the driving impeller and the wave-breaking impeller float in the water body in a manner perpendicular to the internal wave transmission direction, and utilize the internal waves of the water body to drive the driving impeller to rotate and drive the wave-breaking impeller to rotate, and the rotation of the wave-breaking impeller generates an orderly flow field that vertically breaks up the internal waves, thereby achieving the purpose of wave breaking; The wave-breaking impeller assembly includes a driving impeller and two wave-breaking impellers, and the two wave-breaking impellers are symmetrically arranged at the front and rear ends of the driving impeller.

2. The experimental device for internal waves in a large stratified water tank laboratory according to claim 1 is characterized in that: A plurality of the wave-breaking impeller assemblies are mounted side by side on each row of the impeller mounting frames, and the plane where the blades of the wave-breaking impellers are located is perpendicular to the internal wave transmission direction.

3. The experimental device for internal waves in a large stratified water tank laboratory according to claim 1 is characterized in that: The supporting frame is a rectangular frame structure. After the supporting frame is placed in the large stratified water tank, the bottom edge of the supporting frame is parallel to the bottom of the large stratified water tank, the multiple rows of impeller mounting frames are parallel to the water surface, and the side edges of the supporting frame are in contact with the side walls of the large stratified water tank.

4. A method for rapidly eliminating internal waves in a large stratified water tank, based on the experimental device for eliminating internal waves in a large stratified water tank laboratory as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Place the carrier frame in a large layered water tank at an inclined angle, with at least one row of impeller mounting frames immersed in water. The maximum diameter of the impeller is D, the thickness is m, and the spacing between the impeller mounting frames is At this time, the angle between the plane where the support frame is located and the plane where the bottom of the groove is located is ,in, ; S2. The impeller mounting frame rotates relative to the supporting frame under the action of its own gravity, so that the driving impeller and the wave-breaking impeller float in the water body in a manner perpendicular to the internal wave transmission direction; S3. The internal waves in the water body drive the driving impeller to rotate, which drives the wave-breaking impeller to rotate. The rotation of the wave-breaking impeller generates an orderly flow field of vertically broken internal waves, thereby achieving the purpose of wave breaking.

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