Layered flow generation system with adjustable flow velocity section

Abstract

The invention provides a layered flow generation system with an adjustable flow velocity section, and the system comprises a test water tank which is used for accommodating a water body and simulating a target water flow environment; the two ends of the layered flow generation section are communicated with the two ends of the test water tank respectively, the layered flow generation section comprises at least two layers of flow generation sections, and each layer of flow generation section is provided with a flow generation water pump used for guiding vertical layered water flow into the test water tank; the dynamic real-time control module comprises a sensing acquisition unit and a comprehensive control unit which are connected with each other; the sensing acquisition unit is used for acquiring water flow data of each layer of flow making section in real time; the comprehensive control unit is used for controlling the flow making water pumps of all the layers according to the water flow data so as to achieve dynamic adjustment of the flow velocity sections of the flow making sections of all the layers, and then the flow velocity sections adjustable in the vertical direction are formed. According to the invention, the technical problems of single flow velocity distribution, low adjustment flexibility and efficiency and difficulty in meeting high-precision test requirements caused by single design of a flow outlet and short flow velocity section adjustment capability and automation precision in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of flow generation in experimental flumes, and particularly to a stratified flow generation system with adjustable flow velocity cross-section. Background Art

[0002] In the experimental research fields of hydraulic engineering, civil engineering, and ship and ocean engineering, experimental flumes are the core tools for simulating hydrodynamic characteristics, fluid motion laws, and related phenomena. With the help of experimental flumes, researchers can simulate the flow characteristics in actual water environments such as rivers, oceans, and ports, providing support for verifying theoretical models and optimizing engineering designs. The research data is an important basis for promoting the scientific development of related fields.

[0003] Although existing flow generation technologies have tried to break through the limitations of fixed flow velocity cross-sections, such as using the method of fixed perforated plates for flow generation. A fixed perforated plate is set at the water outlet of the experimental flume, and the flow velocity cross-section is adjusted through the holes in the perforated plate. Among them, the hole sizes and distributions of the perforated plates are pre-designed, and the uniform distribution of flow velocity can be achieved to a certain extent. However, in this method, the hole sizes and distributions are fixed, and cannot be dynamically adjusted according to experimental requirements, and lack the ability of remote real-time control, resulting in insufficient experimental flexibility.

[0004] Among them, the main shortcomings of the current flow generation technology for experimental flumes are mainly reflected in the following three aspects: First, a single outlet design is usually adopted in the existing flow generation technology for experimental flumes, resulting in a single distribution of the flow velocity cross-section, which cannot meet the diverse requirements for the flow velocity cross-section under complex experimental conditions, restricting the application scope and flexibility of the experiment; Second, the ability to adjust the flow velocity cross-section of the existing technology is limited. It is difficult to quickly and accurately adjust the flow velocity cross-section according to requirements during the experiment, resulting in insufficient experimental flexibility and affecting the experimental efficiency; Third, the existing adjustment means rely on manual intervention or the cooperation of multiple devices. The adjustment process is time-consuming and has low precision, making it difficult to meet the requirements of high-precision experiments. Summary of the Invention

[0005] The purpose of the present invention is to provide a stratified flow generation system with adjustable flow velocity cross-section, which solves the technical problems that the current flow generation technology for experimental flumes has shortcomings in the single outlet design, the ability to adjust the flow velocity cross-section, and the automation precision, resulting in a single flow velocity distribution, low adjustment flexibility and efficiency, and difficulty in meeting the requirements of high-precision experiments.

[0006] To solve the above technical problems, the technical solution of the present invention is as follows: The present invention provides a stratified flow generating system with adjustable flow velocity cross-section, comprising: a test water tank for accommodating water body and simulating a target water flow environment; a stratified flow generating section, with both ends respectively communicating with both ends of the test water tank, including at least two layers of flow generating sections, and each layer of flow generating section is configured with a flow generating water pump for introducing vertically stratified water flow into the test water tank; a dynamic real-time control module, including a connected sensing and acquisition unit and a comprehensive control unit; the sensing and acquisition unit is used for real-time collecting water flow data of each layer of flow generating section; the comprehensive control unit is used for respectively controlling the flow generating water pump of each layer according to the water flow data to realize dynamic adjustment of the flow velocity cross-section of each layer of flow generating section, and further form a flow velocity cross-section adjustable in the vertical direction.

[0007] Further, each layer of the flow generating section includes a power outflow section and an intermediate connection section; the power outflow section is configured with a flow generating water pump; the intermediate connection section is used for connecting the power outflow section and the test water tank.

[0008] Further, the power outflow section includes a plurality of outflow branch sections, and each outflow branch section is configured with a flow generating water pump; the intermediate connection section is connected with the plurality of outflow branch sections for combining the water flow of the branch sections.

[0009] Further, the plurality of outflow branch sections in each layer of the flow generating section are arranged horizontally side by side.

[0010] Further, the intermediate connection section includes a connected confluence connection section and a connecting square pipe section for connecting with the outflow branch section and the test water tank respectively.

[0011] Further, the sensing and acquisition unit includes a plurality of flow meters, and the plurality of flow meters are respectively arranged on the outflow branch sections and connected with the comprehensive control unit.

[0012] Further, the sensing and acquisition unit further includes an acquisition box, and the plurality of flow meters are connected with the comprehensive control unit through the acquisition box.

[0013] Further, the comprehensive control unit includes a connected frequency conversion cabinet and a control cabinet, and the frequency conversion cabinet is connected with the flow generating water pump.

[0014] Further, the frequency conversion cabinet adopts a plurality of frequency converters for respectively connecting with the flow generating water pumps for respectively independent control.

[0015] Further, the comprehensive control unit further includes a computer connected with the control cabinet for realizing remote control of the frequency conversion cabinet.

[0016] Compared with the prior art, the present invention at least includes the following beneficial effects: 1. Stratified outflow design, flexible adjustment of flow velocity section: Through the stratified outflow design, the invention divides the water outlet into multiple independently controlled stratified units, and the flow velocity and flow rate of each unit can be adjusted separately, realizing flexible adjustment of the flow velocity section in the vertical direction, solving the problem of single flow velocity section in the prior art, and meeting the diverse requirements for flow velocity distribution under complex test conditions (such as stratified flow, turbulent flow or non-uniform flow, etc.).

[0017] 2. Wide adjustment range of flow velocity section and extensive test applicability: The flow velocity section of the invention can be continuously adjusted in the range of 0.1 m / s to 5 m / s, covering a variety of working conditions from low flow velocity to high flow velocity. High-precision control ensures the uniformity of flow velocity distribution, is applicable to a variety of test scenarios, and expands the application range of the test water tank.

[0018] 3. Dynamic real-time control system, significant improvement in test accuracy: The invention adopts a dynamic real-time control module to monitor the water flow state in real time through a sensing and acquisition unit, and a high-precision actuator realizes precise control, controlling the standard deviation of the flow velocity distribution within 3%, significantly improving the accuracy and reliability of test data, and meeting the requirements of high-precision scientific research tests.

[0019] 4. Modular and intelligent design, easy operation and low maintenance cost: The stratified outflow system of the invention adopts a modular design, each unit operates independently, with a low failure rate. The dynamic real-time control system has a high degree of intelligence, is easy to operate and has a low maintenance cost; at the same time, it simplifies the test operation process, reduces the equipment maintenance cost, and is suitable for the test requirements of long-term operation. Description of the Drawings

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of a stratified flow generating system with adjustable flow velocity section; Figure 2 It is a schematic diagram of the structure of a test water tank with adjustable flow velocity section and related parts; Figure 3 It is a transverse sectional view of a test water tank with adjustable flow velocity section and related parts.

[0022] Icon: 1 - Flow generating pump; 2 - Power outflow section; 3 - Confluence connection section; 4 - Connecting trough square pipe section; 5 - Test water tank; 6 - Frequency conversion cabinet; 7 - Control cabinet; 8 - Computer; 9 - Flowmeter; 10 - Acquisition box. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, the terms "arranged", "installed", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] The following will, with reference to the accompanying drawings, give a detailed description of some implementation manners of the present invention. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0026] This embodiment provides a layered flow generation system with adjustable flow velocity cross-section. Please refer to Figures 1-3 as shown in the figure, which includes: a test water tank 5 for containing water and simulating a target water flow environment; a layered flow generation section, the two ends of which are respectively communicated with the two ends of the test water tank 5, including at least two layers of flow generation sections, and each layer of flow generation section is equipped with a flow generation water pump 1 for introducing vertically layered water flow into the test water tank 5; a dynamic real-time control module, including a connected sensing and acquisition unit and a comprehensive control unit; the sensing and acquisition unit is used for real-time collecting the water flow data of each layer of flow generation section; the comprehensive control unit is used for respectively controlling each layer of the flow generation water pump 1 according to the water flow data, so as to realize the dynamic adjustment of the flow velocity cross-section of each layer of flow generation section, and further form a flow velocity cross-section adjustable in the vertical direction.

[0027] Specifically, the layered flow generation section realizes the introduction of vertically layered water flow through a multi-layer design in cooperation with the respective flow generation water pumps 1; the dynamic real-time control module is like the "intelligent brain" of the system. The sensing and acquisition unit collects the water flow data, and the comprehensive control unit accurately controls the flow generation water pumps 1 according to these data, and then flexibly adjusts the flow velocity cross-section. Therefore, through layered independent control and dynamic real-time adjustment, this technical solution breaks through the limitation of a fixed flow velocity cross-section, and effectively solves the technical problems of the prior art such as a single flow velocity cross-section, difficult flexible adjustment and low adjustment accuracy, which is the core basis of the whole invention.

[0028] In this embodiment, each flow generating section includes a power outflow section 2 and an intermediate connection section; the power outflow section 2 is equipped with a flow generating water pump 1; the intermediate connection section is used to connect the power outflow section 2 and the test water tank 5.

[0029] Specifically, the structure of each flow generating section is refined into a power outflow section 2 (equipped with a flow generating water pump 1 to provide power) and an intermediate connection section (connecting the power outflow section 2 and the test water tank 5 to achieve water flow convergence); this modular structural design separates the power generation and water flow convergence functions, making the responsibilities of each part of the system clear, facilitating adaptive design and later independent maintenance; compared with the existing single outflow structure, the adaptability and reliability of the system are greatly improved.

[0030] In this embodiment, the power outflow section 2 includes a plurality of outflow branch sections, and each outflow branch section is equipped with a flow generating water pump 1; the intermediate connection section is connected to the plurality of outflow branch sections and is used to merge the water flows of the branch sections.

[0031] Specifically, on the basis of vertical stratification, the power outflow section 2 is expanded in the horizontal direction; each of the plurality of outflow branch sections is equipped with a flow generating water pump 1, which means that the water flow of each layer can be more finely adjusted in the horizontal direction; the intermediate connection section is responsible for orderly merging of these branch water flows to ensure that the water flow enters the test water tank 5 stably. This design increases the horizontal dimension of flow velocity adjustment, breaking through the bottleneck that it is difficult to differentially adjust the horizontal flow velocity in the prior art; through multi-branch independent control, a more complex and diverse flow velocity distribution can be created, significantly improving the adjustment flexibility of the flow velocity section.

[0032] In this embodiment, the plurality of outflow branch sections in each flow generating section are arranged horizontally in parallel.

[0033] Specifically, the layout of the plurality of outflow branch sections in each layer is horizontal and parallel, and the outflow branch sections in each flow generating section 2 are generally even numbers and symmetric with respect to the midline of the confluence connection section 3. This layout enables the branch water flows to converge and output more smoothly during the flow process, avoiding mutual interference and ensuring the stability and uniformity of the water flow. Among them, as shown in Figure 2 and Figure 3 shown, two layers of four pairs of power outflow sections 2 are adopted in the figure. Among them, two columns of outflow branch sections in each layer (such as the two outer sides of the lower layer) are connected to an intermediate connection section of one layer (such as the fourth layer). This structural design reduces the number of layers of the outflow pipes, that is, the width of the longitudinal arrangement, facilitates connection and communication with the square narrow pipes arranged longitudinally, thereby improving fluid uniformity and saving energy loss, etc.

[0034] In this embodiment, the intermediate connection section includes a connected confluence connection section 3 and a connecting groove square pipe section 4, which are used to connect to the outflow branch section and the test water tank 5 respectively.

[0035] Specifically, the confluence connection section 3 is responsible for initially merging the water flows of multiple outflow branch sections and optimizing the water flow pattern; the continuous trough square pipe section 4 ensures that the merged water flow can be smoothly connected to the test water trough 5, guaranteeing the natural transition and layered flow creation of the water flow; this specific structural design effectively reduces the problems of pressure loss and unstable flow velocity that are prone to occur when multiple branch water flows are merged, further enhancing the stability of the waterway.

[0036] In this embodiment, the sensing and acquisition unit includes multiple flow meters 9, and the multiple flow meters 9 are respectively arranged on the outflow branch sections and connected to the comprehensive control unit.

[0037] Specifically, by setting independent flow meters 9 in each branch section, accurate monitoring of the water flows of each layer and each branch is achieved, providing real-time data support for dynamic control; this use of distributed flow sensors is the key to achieving high-precision dynamic adjustment, directly solving the problem of insufficient adjustment accuracy in the prior art.

[0038] In this embodiment, the sensing and acquisition unit further includes an acquisition box 10, and the multiple flow meters 9 are connected to the comprehensive control unit through the acquisition box 10.

[0039] Specifically, the acquisition box 10 plays the role of data aggregation and transfer, integrating the data collected by the multiple flow meters 9 and transmitting it to the comprehensive control unit, optimizing the data transmission path, and improving the stability and efficiency of data transmission; at the same time, the addition of the acquisition box 10 enhances the integration degree of the sensing system, simplifies the connection between the flow meters 9 and the control unit, reduces signal interference, and improves data transmission efficiency and reliability.

[0040] In this embodiment, the comprehensive control unit includes a frequency conversion cabinet 6 and a control cabinet 7 that are connected, and the frequency conversion cabinet 6 is connected to the flow creation water pump 1.

[0041] Specifically, by introducing frequency conversion control technology, compared with traditional mechanical adjustment or fixed-power water pumps, it can control the water pump to adjust the water flow more accurately and quickly, significantly improving the accuracy and response speed of water flow adjustment, thereby achieving dynamic real-time control.

[0042] In this embodiment, the frequency conversion cabinet 6 uses multiple frequency converters, which are used to be respectively connected to the flow creation water pump 1 for independent control.

[0043] Specifically, the multiple frequency converters respectively control each flow creation water pump 1, achieving true "one-to-one" accurate control, and the flow velocity adjustment of each layer and each branch does not interfere with each other; compared with the traditional method of using a single frequency converter to control multiple water pumps, this independent control method effectively avoids the problem of control coupling, greatly enhancing the flexibility and adjustment accuracy of the system.

[0044] In this embodiment, the integrated control unit further includes a computer 8 connected to the control cabinet 7 for realizing remote control of the frequency conversion cabinet 6.

[0045] Specifically, the computer 8 is connected to the control cabinet 7, getting rid of the limitation of on-site operation. Researchers can remotely operate through the computer 8 to achieve remote real-time regulation of the frequency conversion cabinet 6. They can also preset the flow velocity section parameters through the computer 8 software and monitor them in real time, improving the convenience and automation of test operation, conforming to the intelligent development trend of modern test equipment, and helping to solve the problem of manual dependence in the prior art.

[0046] Structural and principle description (taking the structure of the attached drawing as an example): The structure and principle of this test flume flow generation system with adjustable flow velocity section include: a stratified flow generation section (including two layers of four pairs of power outflow sections 2 and four layers of intermediate connection sections (including the connected confluence connection section 3 and the connecting flume square pipe section 4)) are vertically arranged in 4 layers (taking the number of layers of the intermediate connection section as the number of layers of the vertically arranged flow generation section). Each pair of power outflow sections 2 in each layer includes 4 outflow branch sections arranged horizontally. Among them, two (such as the two outer sides in the first layer) outflow branch sections in each layer are connected to one layer (such as the first layer) of the intermediate connection section. The flow generation water pump 1 is installed at each outflow branch section to provide the required kinetic energy for the branch fluid. The water flow obtained with power flows into the confluence connection section 3, and the confluence connection section 3 combines the two water bodies from the power outflow section 2 and merges them into the connecting flume square pipe section 4 of each layer. The 4-layer connecting flume square pipe section 4 divides the water body into 4 layers, and finally divides and merges into the test flume 5. The frequency conversion cabinet 6 is connected to each layer and each branch flow generation water pump 1, and can realize frequency conversion control of the flow generation water pump 1. The PLC control cabinet 7 is connected to the frequency conversion cabinet 6, and the computer 8 is connected to the PLC control cabinet z, and can realize remote real-time regulation of the frequency conversion cabinet 6. Flow meters 9 are respectively installed on the outflow branch sections, the flow meters 9 are connected to the acquisition box 10, and the acquisition box 10 is connected to the PLC control cabinet 7, and can realize real-time regulation of the water flow of each outflow branch section.

[0047] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A layered flow generating system with adjustable flow velocity cross-section, characterized in that, Comprising: A test water tank (5) for containing water body and simulating a target water flow environment; A layered water flow generating section, with both ends thereof respectively communicating with both ends of the test water tank (5), including at least two layers of water flow generating sections, and each layer of water flow generating section is provided with a water flow generating pump (1) for introducing vertically layered water flow into the test water tank (5); A dynamic real-time control module, including a connected sensing and acquisition unit and an integrated control unit; the sensing and acquisition unit is used for real-time collecting water flow data of each layer of water flow generating section; the integrated control unit is used for respectively controlling each layer of water flow generating pump (1) according to the water flow data to realize dynamic adjustment of the flow velocity cross-section of each layer of water flow generating section, and further form a flow velocity cross-section adjustable in the vertical direction.

2. The stratified flow generating system with adjustable flow velocity cross-section according to claim 1, characterized in that, Each layer of water flow generating section includes a power outflow section (2) and an intermediate connection section; The power outflow section (2) is provided with a water flow generating pump (1); The intermediate connection section is used for connecting the power outflow section (2) and the test water tank (5).

3. The layered flow generation system with adjustable flow velocity cross-section according to claim 2, characterized in that, The power outflow section (2) includes a plurality of outflow branch sections, and each outflow branch section is provided with a water flow generating pump (1); The intermediate connection section is connected to the plurality of outflow branch sections and is used for combining the water flow of the branch sections.

4. The stratified flow generating system with adjustable flow velocity cross-section according to claim 3, characterized in that, In each layer of water flow generating section, the plurality of outflow branch sections are arranged horizontally side by side.

5. The layered flow generating system with adjustable flow velocity cross-section according to claim 3, characterized in that The intermediate connection section includes a connected confluence connection section (3) and a connecting trough square pipe section (4) for respectively connecting with the outflow branch sections and the test water tank (5).

6. The stratified flow generating system with adjustable flow velocity cross-section according to claim 3, characterized in that, The sensing and acquisition unit includes a plurality of flow meters (9), and the plurality of flow meters (9) are respectively arranged on the outflow branch sections and are connected to the integrated control unit.

7. The stratified flow generating system with adjustable flow velocity cross-section according to claim 6, characterized in that, The sensing and acquisition unit further includes an acquisition box (10), and the plurality of flow meters (9) are connected to the integrated control unit through the acquisition box (10).

8. The layered flow generation system with adjustable flow velocity cross-section according to any one of claims 1-7, characterized in that, The integrated control unit includes a connected frequency conversion cabinet (6) and a control cabinet (7), and the frequency conversion cabinet (6) is connected to the water flow generating pump (1).

9. The stratified flow generation system with adjustable flow velocity cross-section according to claim 8, characterized in that, The frequency conversion cabinet (6) adopts a plurality of frequency converters for respectively connecting with the water flow generating pumps (1) for respectively independent control.

10. The stratified flow generating system with adjustable flow velocity cross-section according to claim 8, characterized in that, The integrated control unit further includes a computer (8) connected to the control cabinet (7) for realizing remote control of the frequency conversion cabinet (6).

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