Flat plate type layered fluid internal wave forming device and method
By using a liftable internal wave excitation plate and a vertical lifting drive system in stratified fluids, the problems of flexibility and accuracy in internal wave generation were solved, achieving efficient and pure internal wave excitation and improving the reliability and repeatability of the experiment.
Patent Information
- Application Number
- CN202511758800.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-27
- Publication Date
- 2026-01-23
AI Technical Summary
Existing internal wave generation techniques are difficult to achieve flexible and precise internal wave excitation in stratified fluids, and suffer from problems such as large initial disturbances, complex waveforms, and low energy efficiency.
The system employs a liftable internal wave excitation plate and a vertical lifting drive system to excite internal waves at a specific density interface of the stratified fluid through vertical reciprocating motion, and achieves automated operation in conjunction with a control system.
It achieves flexible control of the internal wave excitation depth, with pure waveforms and high energy efficiency, reduces initial disturbance to the stratified fluid, and provides high-precision experimental conditions.
Smart Images
Figure CN121384392A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of wave making devices, and particularly relates to a flat-plate type wave forming device in stratified fluid and a method. BACKGROUND
[0002] Internal wave is a gravity wave occurring in stable stratified fluid, and has crucial research significance in the fields of ocean energy transmission, material transportation and underwater vehicle safety. Due to high cost and uncontrollable environment of ocean field observation, a laboratory physical model becomes a main means for revealing internal wave mechanism.
[0003] The existing internal wave generation technology has many limitations, and it is difficult to meet the needs of high-precision quantitative research: (1) Fixed excitation depth, poor flexibility: the wave making plate of the traditional device is fixedly installed, and changing the excitation depth needs to stop the machine, drain water and re-adjust the equipment, which is complicated to operate and cannot realize rapid experiments at different depths.
[0004] (2) Low internal wave purity, complex mode: horizontal movement of the wave making plate easily disturbs multiple density layers, excites multi-mode internal waves and couples with surface waves, increasing the difficulty of data analysis.
[0005] (3) Large initial disturbance, poor stability: the wake and vortex generated by horizontal movement can destroy the stratified fluid structure, resulting in unclean initial conditions of the experiment.
[0006] (4) Low energy efficiency: horizontal movement needs to overcome a large amount of water inertia, and the energy ratio of effectively exciting specific interface internal waves is low.
[0007] Among them, the most representative existing technology is the horizontal moving wave making machine, and its core defects are fixed excitation position, complex wave shape and large initial disturbance, which seriously limit the high-precision and high-flexibility internal wave experimental research.
[0008] Therefore, it is urgent to develop a device that can accurately and controllably generate internal waves at any specified density interface of stratified fluid in a water tank. SUMMARY
[0009] The application provides a flat-plate type wave forming device in stratified fluid and a method, which realizes precise control ability of internal wave excitation at any preset depth of stratified fluid through a liftable internal wave excitation plate. The device effectively solves the problems that the traditional method is difficult to perform experiments at different depths of stratified fluid, and is difficult to accurately control, which cannot meet the needs of quantitative research.
[0010] The first object of the present application is to provide a flat plate type layered fluid internal wave forming device, comprising a layered fluid tank for containing two or more stable layered fluids, and a liftable internal wave generating mechanism. The liftable internal wave generating mechanism is arranged above the layered fluid tank, and comprises a support positioning frame, a vertical lifting driving system and an internal wave exciting plate.
[0011] Preferably, the vertical lifting driving system comprises a lifting frame, a servo motor, a transmission gear and a linear rack.
[0012] Preferably, the lifting frame is symmetrically arranged on the outside of the support positioning frame.
[0013] Preferably, the support positioning frame is vertically provided with a limiting sliding rod arranged in the limiting sliding groove.
[0014] Preferably, the internal wave exciting plate is horizontally arranged and has a flat plate structure.
[0015] Preferably, the device further comprises a control system for coordinating the operation of the vertical lifting driving system to realize an automatic vertical wave making process.
[0016] The second object of the present application is to provide a flat plate type layered fluid internal wave forming method based on the above device, comprising the following steps: S1, injecting fluids with different densities into the layered fluid tank through the tank inflow port to form a stable layered fluid structure after standing, wherein the layered fluid structure is two or more density layers. S2, start the vertical lifting driving system, drive the internal wave excitation plate to move along the vertical direction, accurately position the internal wave excitation plate at the target density interface in the stratified fluid, and drive the internal wave excitation plate to do controllable vertical reciprocating motion at the target density interface, concentrate the disturbance energy to the target density interface, and excite to generate continuous periodic internal waves; S3, adjust the liquid level in the stratified fluid tank through the outflow port of the tank during the experiment, maintain the stability of the stratified fluid, and observe the internal wave evolution process.
[0017] The beneficial effects of the present application are: (1) The internal wave excitation depth is controllable: the present application sets up a vertical lifting driving system to make the internal wave excitation plate have the ability to move freely and accurately position in the vertical direction, solves the bottleneck problem of fixed internal wave excitation depth in the prior art, makes researchers can flexibly and quickly excite internal waves at any specified density interface of stratified fluid, greatly expands the application range and research efficiency of the experiment.
[0018] (2) High flexibility in wave form quality, can quickly adapt to complex experimental requirements: the present application realizes the vertical reciprocating motion of the internal wave excitation plate through the vertical lifting driving system, concentrates and vertically acts the mechanical disturbance energy on the specific density interface, effectively overcomes the defect that the horizontal moving wave maker disturbs multiple layers at the same time, so as to excite internal waves with single mode, pure wave form and strong controllability, which provides ideal experimental conditions for high-precision quantitative measurement and mechanism analysis.
[0019] (3) Controllable stroke, specific local disturbance: compared with the large stroke horizontal motion of the prior art, the vertical reciprocating motion adopted by the present application can significantly reduce the wake and transverse turbulence generated in the wave making process, maximally reduces the initial damage to the stable stratified fluid environment, effectively maintains the cleanliness of the experimental area, thereby greatly improves the accuracy and reliability of the observation results of the internal wave evolution process. BRIEF DESCRIPTION OF DRAWINGS
[0020] For easy description, the present application is described in detail by the following specific implementation and drawings.
[0021] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the lifting internal wave generating mechanism of the present application; Figure 3 It is a two-layer internal wave making process schematic diagram of the present application; Figure 4 It is a three-layer internal wave making process schematic diagram of the present application.
[0022] In the drawings: 100 - stratified fluid tank; 110 - tank inflow port; 120 - tank outflow port; 200 - liftable internal wave generating mechanism; 210 - support positioning frame; 211 - limiting slide rod; 220 - vertical lifting driving system; 221 - lifting frame; 222 - servo motor; 223 - transmission gear; 224 - linear rack; 225 - motor base; 226 - fixed cross frame; 227 - limiting sliding groove; 230 - internal wave excitation plate. DETAILED DESCRIPTION
[0023] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments; in the following description, specific details such as specific configurations and components are provided only to help a comprehensive understanding of the embodiments of the present application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, descriptions of known functions and structures are omitted for clarity and brevity.
[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0025] As Figures 1-4 shown, the present application provides a flat plate type stratified fluid internal wave forming device, which comprises a stratified fluid tank 100 and a liftable internal wave generating mechanism 200. The stratified fluid tank is used to contain stable stratified fluid with two or more layers. The side wall of the stratified fluid tank 100 is provided with a tank inflow port 110, and the bottom is provided with a tank outflow port 120. The liftable internal wave generating mechanism 200 is arranged above the stratified fluid tank 100. The liftable internal wave generating mechanism 200 comprises a support positioning frame 210, a vertical lifting driving system 220 and an internal wave excitation plate 230. The two ends of the support positioning frame 210 are fixedly connected with the two side walls of the stratified fluid tank 100, respectively. The vertical lifting driving system 220 is installed on the support positioning frame 210 and can move up and down along the support positioning frame 210. The bottom end of the vertical lifting driving system 220 is fixedly connected with the internal wave excitation plate 230, which can drive the internal wave excitation plate 230 to make reciprocating motion in the vertical direction at a specified depth, so as to excite internal waves at the specific density interface of the stratified fluid.
[0026] Specifically, the support positioning frame 210 is fixedly connected with the two side walls of the stratified fluid tank 100 at both ends to form a stable support structure; the vertical lifting driving system 220 refers to a system capable of lifting along the support positioning frame 210 and driving the inner wave excitation plate 230 to make reciprocating motion in the vertical direction at a specified depth; the inner wave excitation plate 230 refers to a rigid flat structure for disturbing stratified fluid to generate internal waves. Thus, the device can excite internal waves at a specific density interface of stratified fluid, solve the problem of fixed excitation depth and poor flexibility, avoid the cumbersome operation of stopping drainage to adjust the excitation position in the traditional method, and at the same time, the vertical motion mode reduces the initial disturbance to the stratified fluid, ensures the stability of the stratified environment, thereby generating pure periodic internal waves, and improves the transmission efficiency of disturbance energy to the specific density interface.
[0027] The vertical lifting driving system 220 further includes a lifting frame 221, a servo motor 222, a transmission gear 223 and a linear rack 224; the lifting frame 221 is located inside the support positioning frame 210, and a fixed cross frame 226 is symmetrically arranged on the outside of the lifting frame 221; the linear rack 224 is installed on the fixed cross frame 226 located in the middle; the servo motor 223 is fixed to the support positioning frame 210 through a motor base 225, the transmission gear 223 is in transmission connection with the output shaft of the servo motor 222 through a shaft coupling, and the transmission gear 223 is in meshing connection with the linear rack 224.
[0028] Specifically, the scheme of the present application drives the transmission gear 223 to rotate through the servo motor 222, and the transmission gear 223 and the linear rack 224 are in meshing connection to convert the rotary motion into the vertical linear motion of the lifting frame 221; the lifting frame 221 is constrained to move inside the support positioning frame 210, and the guiding effect ensures that the inner wave excitation plate 230 moves only in the vertical direction; the servo motor 222 is firmly fixed to the support positioning frame 210 through the motor base 225, thereby reducing the transmission of vibration to the stratified fluid; and thus the depth of the inner wave excitation plate 230 in the stratified fluid is accurately regulated and stably reciprocated.
[0029] Through the above technical scheme, the present application realizes flexible and accurate adjustment of the internal wave excitation depth, and can quickly switch the target density interface position without stopping drainage; at the same time, the rigid meshing of the gear and the rack and the guiding structure ensure the stability of the vertical motion, significantly reduce the additional disturbance to the stratified fluid, and improve the purity and experimental repeatability of internal wave excitation.
[0030] The present application further provides that the fixed cross frames 226 located on both sides are provided with limiting sliding grooves 227, and the support positioning frame 210 is vertically provided with a limiting sliding rod 211 located in the limiting sliding groove 227.
[0031] Specifically, the limiting sliding rod 211 is rigidly fixed to the support positioning frame 210 and extends in the vertical direction, and the limiting sliding groove 227 is symmetrically arranged on the fixed horizontal frame 226 and forms a sliding fit with the limiting sliding rod 211. When the vertical lifting driving system 220 drives the lifting frame 221 to perform vertical reciprocating motion, the limiting sliding rod 211 slides in the limiting sliding groove 227. The physical constraint of the sliding groove on the sliding rod strictly limits the movement of the lifting frame 221 in the vertical direction, effectively inhibits the lateral deviation caused by mechanical vibration or external force interference, and ensures the accurate positioning of the internal wave excitation plate 230 at the target density interface and the repeatability of the movement trajectory.
[0032] The application further proposes that the internal wave excitation plate 230 is connected to the bottom end of the lifting frame 221, and the internal wave excitation plate 230 is a horizontal flat plate structure, the size of which is optimized according to the cross-sectional size of the stratified fluid tank 4 to maximize the internal wave excitation efficiency.
[0033] Specifically, the scheme of the application ensures strict controllability of the vertical movement trajectory through the fixed connection of the two ends of the internal wave excitation plate 230, combines the uniform action of the horizontal flat plate structure on the target density interface during reciprocating motion, and optimizes the size design to form a geometric coordination relationship between the excitation plate and the cross section of the tank, thereby concentrating the disturbance energy on the specific density interface, reducing the dispersion of energy to non-target areas, and inhibiting the turbulence and mixing phenomenon caused by size mismatch.
[0034] The application further proposes that the device further comprises a control system for coordinating the operation of the vertical lifting driving system 220, realizing the automatic working process of vertical wave making.
[0035] Specifically, the scheme of the application receives the preset depth parameters and movement trajectory instructions through the control system, automatically drives the vertical lifting driving system 220 to perform accurate lifting operation, so that the internal wave excitation plate 230 can quickly position to the target density interface in the stratified fluid, and perform controllable vertical reciprocating motion at the interface. The coordinated work of the control system and the vertical lifting driving system 220 ensures the timing accuracy and position repeatability of the movement process, effectively avoids the time-consuming depth adjustment and movement trajectory fluctuation caused by human error in manual operation, reduces the disturbance to the initial state of the stratified fluid, and provides a clean experimental environment for internal wave excitation.
[0036] The application also proposes a flat plate type stratified fluid internal wave forming method, which is realized based on the above device and includes the following steps: S1, injecting fluids with different densities into the stratified fluid tank 100 through the tank inlet 110, and forming a stable stratified fluid structure after standing, the stratified fluid structure being a two-layer or more density stratification; S2. Start the vertical lifting drive system 220 to drive the internal wave excitation plate 230 to move in the vertical direction, accurately position the internal wave excitation plate 230 at the preset target density interface in the stratified fluid, and drive the internal wave excitation plate 230 to make controllable vertical reciprocating motion at the target density interface, concentrate and transfer disturbance energy to the target density interface, and excite the generation of continuous periodic internal waves. S3. During the experiment, the liquid level in the stratified fluid tank 100 is adjusted by the outlet 120 of the water tank to maintain the stability of the stratified fluid, while the evolution of the internal wave is observed.
[0037] This application combines a vertical lifting drive system 220 with an internal wave excitation plate 230 in a vertical reciprocating motion, thereby achieving flexible adjustment of the internal wave excitation depth and concentrated transfer of disturbance energy. This solves the problems of fixed internal wave excitation depth, complex internal wave modes, large initial disturbance to the stratified fluid, and low energy transfer efficiency, achieving high-purity, repeatable, and flexible internal wave generation. Specifically, in step S1, fluid is injected through the inlet 110 of the water tank and allowed to settle to form a stable stratified structure, avoiding the initial turbulence and mixing generated by traditional horizontal movement methods, ensuring the initial stability of the stratified environment. In step S2, the vertical lifting drive system 220 drives the internal wave excitation plate 230 to move vertically to the target density interface and reciprocate, applying disturbance only to a specific interface, avoiding simultaneous disturbance of multiple density layers, reducing wake and vortex generation, and concentrating the disturbance energy to the target interface, significantly improving energy utilization efficiency. In step S3, the liquid level is dynamically adjusted through the outlet 120 of the water tank to maintain the long-term stability of the stratified structure, ensuring the repeatability of the experiment. The above technical solutions effectively overcome the limitations of traditional internal wave generation methods in terms of controllability, flexibility, and purity, providing reliable technical support for the study of internal wave mechanisms.
[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0039] In the description of this application, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 application.
Claims
1. A planar stratified fluid internal wave generating device, characterized in that, include: A stratified fluid tank (100) is used to contain two or more stable stratified fluids; The layered fluid tank (100) has a tank inlet (110) on its side wall and a tank outlet (120) at its bottom. A liftable internal wave generating mechanism (200) is provided above a stratified fluid tank (100). The liftable internal wave generating mechanism (200) includes a support positioning frame (210), a vertical lifting drive system (220), and an internal wave excitation plate (230). The two ends of the support positioning frame (210) are fixedly connected to the two side walls of the stratified fluid tank (100). The vertical lifting drive system (220) is installed on the support positioning frame (210) and can move up and down along the support positioning frame (210). The bottom end of the vertical lifting drive system (220) is fixedly connected to the internal wave excitation plate (230) and can drive the internal wave excitation plate (230) to reciprocate vertically at a specified depth, thereby generating internal waves at a specific density interface of the stratified fluid.
2. The planar stratified fluid internal wave forming device according to claim 1, characterized in that, The vertical lifting drive system (220) includes a lifting frame (221), a servo motor (222), a transmission gear (223), and a linear rack (224). The lifting frame (221) is located inside the support positioning frame (210). The linear rack (224) is fixed to the lifting frame (221) in the vertical direction. The servo motor (222) is fixed to the support positioning frame (210) through a motor mount (225). The transmission gear (223) is connected to the output shaft of the servo motor (222) through a coupling. The transmission gear (223) meshes with the linear rack (224).
3. The planar stratified fluid internal wave forming device according to claim 2, characterized in that, The lifting frame (221) is symmetrically provided with fixed crossbeams (226) on its outer side, and the linear rack (224) is installed on the fixed crossbeams (226) located in the middle.
4. The planar stratified fluid internal wave forming device according to claim 3, characterized in that, The fixed crossbars (226) located on both sides are provided with limiting grooves (227), and the supporting positioning frame (210) is provided with a limiting rod (211) in the vertical direction. The limiting rod (211) is located in the limiting groove (227).
5. A planar stratified fluid internal wave forming device according to claim 2, characterized in that, The inner wave excitation plate (230) is connected to the bottom of the lifting frame (221) at both ends. The inner wave excitation plate (230) is a horizontally placed flat plate structure. Its size is optimized according to the cross-sectional size of the layered fluid tank (4) to maximize the inner wave excitation efficiency.
6. The planar stratified fluid internal wave forming device according to claim 1, characterized in that, The device also includes a control system for coordinating the operation of the vertical lifting drive system (220) to achieve an automated workflow for vertical wave generation.
7. A method for generating internal waves in a planar stratified fluid, characterized in that, Based on the apparatus according to any one of claims 1-6, the method includes the following steps: S1. Fluids of different densities are injected into the stratified fluid tank (100) through the inlet (110) of the water tank, and after standing, a stable stratified fluid structure is formed. The stratified fluid structure is a two-layer or higher density stratification. S2. Start the vertical lifting drive system (220) to drive the internal wave excitation plate (230) to move in the vertical direction, accurately position the internal wave excitation plate (230) to the preset target density interface in the stratified fluid, and drive the internal wave excitation plate (230) to make controllable vertical reciprocating motion at the target density interface, concentrate and transfer disturbance energy to the target density interface, and excite the generation of continuous periodic internal waves. S3. During the experiment, the liquid level in the stratified fluid tank (100) is adjusted by the outlet (120) of the water tank to maintain the stability of the stratified fluid, and the internal wave evolution process is observed at the same time.