Wave absorbing impeller assembly and device and method for rapidly eliminating internal waves of wave absorbing impeller assembly and device

Abstract

The invention discloses a wave absorbing impeller assembly and device and a method for rapidly eliminating internal waves thereof.The wave absorbing impeller assembly comprises a driving impeller and a wave absorbing impeller which are coaxially arranged, and the driving impeller and the wave absorbing impeller float in a water body in the mode of being perpendicular to the transmission direction of the internal waves; water body internal waves are utilized to drive the driving impeller to rotate so as to drive the wave absorbing impeller to rotate, the wave absorbing impeller rotates to generate a vertical breaking internal wave ordered flow field, and the purpose of wave absorbing is achieved. The wave-absorbing impeller assembly and device have the technical advantages that energy dissipation of internal waves is faster, the efficiency of eliminating the internal waves is higher, and disturbance to density stratification of a water body is smaller.

Description

Technical Field

[0002] The invention discloses a wave-breaking impeller assembly and a device capable of eliminating internal waves in a laboratory, and a method for quickly eliminating the internal waves. Background Art

[0004] In recent years, with the continuous deepening of the country's marine development, various types of marine engineering construction are in full swing, and the importance of underwater vehicles has become increasingly prominent. Various laboratories have conducted more frequent and detailed research on ocean internal waves that affect the safety of marine engineering structures and underwater vehicles. After the internal waves are generated in the laboratory, how to quickly eliminate the waves is of great significance to improving the test efficiency.

[0005] The wave-breaking devices currently used in laboratories are mainly inclined wave breakers and wedge-shaped wave breakers, which use the lifting and compression effects of the terrain to break up internal waves to achieve the purpose of wave breaking. However, this method of wave breaking is time-consuming, especially in some large stratified flow flumes, which greatly affects the efficiency of experimental research.

[0006] The Chinese patent with publication number CN109323846A discloses an impeller-type wave-breaking and rectifying device, which is composed of a panel, a deceleration array, a diverter protrusion, a wave-breaking frame, an energy-consuming impeller, and a return pipe; the panel is arranged in an inclined state, and a deceleration array, a diverter protrusion and a wave-breaking frame are distributed on its surface; the deceleration array is composed of ellipsoidal pits and protrusions; the diverter protrusion is ellipsoidal and arranged between the wave-breaking frames; the wave-breaking frame is grid-shaped and installed above the entrance of the return pipe; the energy-consuming impeller is installed at the entrance of the return pipe and can rotate freely; the cross-section of the return pipe is a regular quadrilateral.

[0007] The above patent mainly solves the surface waves of water bodies, and it cannot eliminate internal waves. The water body will produce density jump layers due to uneven density distribution. When the density jump layers are disturbed, internal waves will be generated. Compared with surface waves, the restoring force is extremely weak, about 0.1% of the surface waves, and its amplitude can reach more than 100 meters. Therefore, its fluctuating 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-breaking and rectifier device published in the above patent uses the wave surface flow of the surface wave to impact the impeller from one side to dissipate energy, but there are flow fields above and below the wave surface of the internal wave, and the device cannot work in the internal wave flow field. Summary of the invention

[0009] In order to overcome the problems of long time and low efficiency in eliminating internal waves in large-scale stratified flow troughs in laboratories, following the principles of simple structure, safe and convenient operation, the present invention proposes a wave-breaking impeller assembly, a device and a method for quickly eliminating internal waves in the laboratory. The wave-breaking impeller assembly uses internal waves to drive the impeller, which drives the wave-breaking impeller to rotate to generate an orderly flow field that vertically breaks up the internal waves in the water body, thereby achieving the technical purpose of quickly eliminating internal waves in the water body.

[0010] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0011] A wave-breaking impeller assembly comprises a coaxially arranged driving impeller and a wave-breaking impeller, wherein the driving impeller and the wave-breaking impeller float in a water body in a manner perpendicular to the transmission direction of internal waves, and the driving impeller is driven to rotate by utilizing internal waves in the water body to drive the wave-breaking impeller to rotate, and the rotation of the wave-breaking impeller generates an orderly flow field that vertically breaks up internal waves, thereby achieving the purpose of wave breaking.

[0012] The wave-breaking impeller assembly comprises 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.

[0013] The present invention further discloses an experimental device suitable for internal waves in a large stratified water tank laboratory, comprising:

[0014] A supporting frame and an impeller mounting frame, wherein the impeller mounting frame comprises multiple rows, and the multiple rows of impeller mounting frames are arranged side by side on the supporting frame in a horizontal direction, and each row of impeller mounting frames can rotate relative to the supporting frame, and the wave-breaking impeller assembly is installed on each row of impeller mounting frames.

[0015] 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 impeller are located is perpendicular to the internal wave transmission direction.

[0016] 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 respectively 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.

[0017] A method for quickly 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, comprises the following steps:

[0018] S1. Place the support 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, ;

[0019] 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;

[0020] 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 to achieve the purpose of wave breaking.

[0021] Beneficial effects:

[0022] The present invention makes full use of the internal wave flow field to drive the impeller to drive the breaking impeller to rotate to generate disturbances perpendicular to the internal wave flow field to form turbulence. Compared with the existing wave breaking device:

[0023] 1. The impeller structure generates more turbulence, dissipates the energy of internal waves faster, and eliminates internal waves more efficiently.

[0024] 2. Since turbulence is generated between adjacent impellers, the disturbance to the water density stratification is smaller, which is more conducive to the continuation of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional diagram of the wave-breaking impeller assembly of the present invention;

[0027] Figure 2 for Figure 1 The main view;

[0028] Figure 3 for Figure 1 Side view of

[0029] Figure 4 It is a structural schematic diagram of installing the wave-breaking impeller assembly on the impeller mounting frame;

[0030] Figure 5 The schematic diagram of the structure of the experimental device for the internal waves in a large stratified water tank laboratory;

[0031] Figure 6 This is a schematic diagram of the wave elimination principle of the present invention;

[0032] Among them, 1 is the frame of the support frame; 2 is the wave-breaking impeller assembly; 3 is the impeller mounting frame; 4 is the high-density liquid; 5 is the low-density liquid; and 6 is the density boundary layer. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] like Figure 1 As shown, a wave-breaking impeller assembly includes a coaxially arranged driving impeller and a wave-breaking impeller, wherein the driving impeller and the wave-breaking impeller float in the water body in a manner perpendicular to the internal wave transmission direction, and the driving impeller is driven to rotate by the internal waves of the water body to drive the wave-breaking impeller to rotate, and the rotation of the wave-breaking impeller generates an orderly flow field for vertically breaking the internal waves, thereby achieving the purpose of wave breaking.

[0037] As a preferred embodiment of the wave-breaking impeller assembly of the present invention, considering that the internal wave will be reflected after hitting the water tank wall, the wave-breaking impeller includes two wave-breaking impellers, and the two wave-breaking impellers are symmetrically arranged at the front and rear ends of the driving impeller.

[0038] Example 2

[0039] like Figure 3 As shown, the present invention further discloses an experimental device suitable for internal waves in a large stratified water tank laboratory, which is different from the remaining embodiment 1 in that it includes:

[0040] A supporting frame and an impeller mounting frame, wherein the impeller mounting frame comprises multiple rows, and the multiple rows of impeller mounting frames are arranged side by side on the supporting frame, and each row of impeller mounting frames can rotate relative to the supporting frame, and the wave-breaking impeller assembly is installed on each row of impeller mounting frames.

[0041] As a further preferred embodiment of the technical solution of Example 2, a plurality of the wave-breaking impeller assemblies are installed side by side on each row of the impeller mounting frames, and the plane where the blades of the wave-breaking impeller are located is perpendicular to the internal wave transmission direction.

[0042] 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 respectively 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.

[0043] A method for quickly eliminating internal waves in a large stratified water tank, using the above-mentioned experimental device for eliminating internal waves in a large stratified water tank laboratory, comprises the following steps:

[0044] S1. Place the support 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, ;

[0045] S2, the impeller mounting frame rotates relative to the supporting frame under the gravity of the impeller mounting frame and the wave-breaking impeller assembly, 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; the central axis of the impeller in the wave-breaking device always remains horizontal, thereby improving the efficiency of absorbing internal wave energy;

[0046] 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 to achieve the purpose of wave breaking.

Claims

1. A wave-breaking impeller assembly, characterized in that: The invention comprises a coaxially arranged driving impeller and a wave-breaking impeller, wherein the driving impeller and the wave-breaking impeller float in the water body in a manner perpendicular to the transmission direction of the internal waves, and the driving impeller is driven to rotate by the internal waves of the water body to drive the wave-breaking impeller to rotate, and the rotation of the wave-breaking impeller generates an orderly flow field for vertically breaking the internal waves, thereby achieving the purpose of wave breaking.

2. The wave-breaking impeller assembly according to claim 1, characterized in that: The wave-breaking impeller assembly comprises 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.

3. An experimental device suitable for internal waves in a large stratified water tank laboratory, characterized in that: include: A supporting 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 supporting frame in a horizontal direction, and each row of impeller mounting frames can rotate relative to the supporting frame, and each row of impeller mounting frames is installed with a wave-breaking impeller assembly as described in claim 1 or 2.

4. The experimental device for internal waves in a large stratified water tank laboratory according to claim 3 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 impeller are located is perpendicular to the internal wave transmission direction.

5. The experimental device for internal waves in a large stratified water tank laboratory according to claim 3 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 respectively 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.

6. A method for quickly eliminating internal waves in a large stratified water tank, based on the experimental device for internal waves in a large stratified water tank laboratory as claimed in any one of claims 3 to 5, characterized in that: The following steps are involved: S1. Place the support 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 to achieve the purpose of wave breaking.

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