Multi-parameter measurement system for low-pressure water flow aeration model test

Abstract

A multi-parameter measurement system for a low-pressure water flow aeration model test is provided with an aeration multi-parameter centralized measurement unit for data acquisition, and a communication interface which is connected with the aeration multi-parameter centralized measurement unit through a data line and is used for transmitting the data acquired by the aeration multi-parameter centralized measurement unit to a control and data processing unit, the communication interface is connected with a power supply through a power line, a display screen used for displaying measurement data in real time, device buttons, a control panel with a built-in controller mainboard and a data acquisition and recording unit, the display screen is connected with the device buttons and the data acquisition and recording unit respectively and used for displaying the measurement data in real time, and the control panel is connected with the data acquisition and recording unit. The built-in controller mainboard controls the data acquisition and recording unit to start and stop data acquisition, and the data acquisition and recording unit is connected with the communication interface through a USB or an Ethernet interface. According to the utility model, the aeration concentration, the flow velocity, the pulsating pressure, the time-sharing pressure, the flow, the water depth and the like can be accurately and efficiently measured.

Description

Technical Field

[0001] The utility model relates to a parameter measurement system for a low-pressure water flow aeration model test, and particularly to a multi-parameter measurement system for a low-pressure water flow aeration model test. Background Art

[0002] The phenomenon of water aeration is a common phenomenon in hydraulics, and often occurs in jet flow, high-speed open channel flow, and so on. The cavitation damage caused by high-speed water flow will pose a serious threat to the safe operation of the discharge structure. In engineering practice, the main method used is to increase the concentration of aeration in the water body to reduce cavitation damage. Due to the undulating terrain and rich hydropower resources in southwest my country, many water conservancy projects under construction and planned in the future will be carried out in the high-altitude areas of the southwest. Due to the low air pressure in high-altitude areas, when conducting dam model tests, they need to be carried out in a decompression box that creates a low-pressure environment. The measurements include various physical quantities such as aeration concentration, flow rate, pulsating pressure, time-averaged pressure, flow rate, and water depth. However, the measurement equipment for different physical quantities is complex and the measurement process is also very cumbersome.

[0003] At present, in general, in the traditional low-pressure water flow aeration model test, the operator cannot enter the decompression box to measure during the test, which makes it difficult to objectively and comprehensively reflect the composite characteristics of the changes in parameters such as aeration concentration, flow rate, pulsating pressure, time-averaged pressure, flow rate and water depth before and after the water flow is aerated. This has limited the development of low-pressure environment water flow aeration research to a certain extent. Therefore, it is urgent to invent a multi-parameter measurement system for low-pressure water flow aeration model test. Summary of the invention

[0004] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a multi-parameter measurement system for low-pressure water flow aeration model tests that can accurately and efficiently measure key physical quantities including aeration concentration, flow velocity, pulsating pressure, time-averaged pressure, flow rate and water depth.

[0005] The technical solution adopted by the utility model is: a multi-parameter measurement system for low-pressure water flow aeration model test, which is composed of a control and data processing unit and a data acquisition unit, wherein the data acquisition unit includes an aeration multi-parameter measurement unit for data acquisition, and a communication interface connected to the aeration multi-parameter measurement unit through a data line for transmitting the data collected by the aeration multi-parameter measurement unit to the control and data processing unit, wherein the communication interface is connected to the power supply through a power line; the control and data processing part includes a display screen for real-time display of measurement data, a device button, a control panel with a built-in controller mainboard, and a data acquisition and recording unit, wherein the display screen is respectively connected to the device button and the data acquisition and recording unit for real-time display of measurement data, the control panel is connected to the data acquisition and recording unit, and the data acquisition and recording unit is controlled to start and stop data acquisition through the built-in controller mainboard, and the data acquisition and recording unit is connected to the communication interface through a USB or Ethernet interface for obtaining measurement data from the aeration multi-parameter measurement unit.

[0006] The multi-parameter measurement system of the utility model for low-pressure water flow aeration model test can accurately and efficiently measure key physical quantities including aeration concentration, flow velocity, pulsating pressure, time-averaged pressure, flow rate and water depth, and perform comparison and analysis. The basic measurement data can be used to conduct experiments and in-depth research on the action mechanism of aerated water flow under low-pressure environment, and can also be used for feedback verification and re-optimization design of the model, as well as the layout design of various aeration facilities, thereby improving the effectiveness and efficiency of aeration cavitation reduction under low-pressure conditions.

[0007] The multi-parameter measurement system for the low-pressure water flow aeration model test of the utility model has a simple structure and is easy to operate. When conducting tests in a pressure reduction box, the height and telescopic range of the positioning bracket of the measurement device can be adjusted to meet different test requirements, or can be widely used in model tests and research of water conservancy projects. At the same time, the measurement system can not only comprehensively and accurately measure the key physical parameters in a low-pressure environment, but also has the characteristics of high integration and easy operation, and can be widely used in model tests and research of water conservancy projects. Through the real-time data analysis function, the system provides a powerful tool for the study of low-pressure water flow aeration, helps to establish a more accurate prediction model of the action mechanism of aerated water flow, and provides strong support for in-depth research on the action mechanism of aerated water flow in a low-pressure environment, thereby improving the effectiveness and efficiency of aeration cavitation reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the overall structure of the multi-parameter measurement system used for low-pressure water flow aeration model test of the utility model;

[0009] Figure 2 yes Figure 1Schematic diagram of the overall structure of the multi-parameter measurement unit for aeration;

[0010] Figure 3 The utility model is an application schematic diagram of a multi-parameter measurement system for a low-pressure water flow aeration model test.

[0011] In the picture

[0012] 1: Display 2: Device buttons

[0013] 3: Control panel 4: Communication interface

[0014] 5: Data acquisition and recording unit 6: Support column

[0015] 7: Rotary fasteners 8: Positioning fasteners

[0016] 9: Support frame 10: Aeration multi-parameter measurement unit

[0017] 11: Sensor assembly 12: Power cord

[0018] 13: Signal transmission line 14: Power supply

[0019] 15: Control box DETAILED DESCRIPTION

[0020] The multi-parameter measurement system for low-pressure water flow aeration model test of the utility model is described in detail below in conjunction with the embodiments and drawings.

[0021] like Figure 1As shown, the multi-parameter measurement system for low-pressure water flow aeration model test of the utility model is composed of a control and data processing unit and a data acquisition unit. The data acquisition unit includes an aeration multi-parameter measurement unit 10 for data acquisition, and a communication interface 4 connected to the aeration multi-parameter measurement unit 10 through a data line for transmitting the data collected by the aeration multi-parameter measurement unit 10 to the control and data processing unit, and the communication interface 4 is connected to the power supply 14 through a power line 12; the control and data processing part includes a display screen 1 for real-time display of measurement data, a device button 2, a control panel 3 with a built-in controller mainboard, and a data acquisition and recording unit 5, the display screen 1 is respectively connected to the device button 2 and the data acquisition and recording unit 5 for real-time display of measurement data, and an LCD liquid crystal display can be used; the control panel 3 is connected to the data acquisition and recording unit 5, and the data acquisition and recording unit 5 is controlled to start and stop data acquisition through the built-in controller mainboard, and the controller mainboard is an embedded controller of model KB9012 or IT8528, or a touch screen controller of model GSL1680F QFN40. The data acquisition and recording unit 5 is connected to the communication interface 4 via a USB or Ethernet interface, and is used to obtain measurement data from the aeration multi-parameter measurement unit 10. The control panel 3 can use an LCD liquid crystal display and is connected to the built-in controller motherboard via an internal bus. The communication interface 4 can use a serial RS-232 or RS-485 communication method.

[0022] The data acquisition and recording unit 5 is composed of a computer, in which: general data acquisition software such as LabVIEW or NIDAQmx is installed to receive information from the communication interface 4 and realize data acquisition; data processing software such as MATLAB or Python is installed to be used for advanced analysis and visualization of data; software such as SIMATIC WinCC or FactoryTalkView is installed to be used for monitoring and management parameters; software such as Aquarius Time-Series or HydroBase is installed to be used for comprehensive management and analysis of data and support data access of sensors; and TeamViewer software for automatic diagnosis and maintenance is installed.

[0023] The control and data processing unit is arranged in a control box 15 ; wherein the display screen 1 , device buttons 2 and control panel 3 are embedded in the surface of the control box 15 , and the data acquisition and recording unit 5 is arranged in the lower part of the control box 15 .

[0024] The data acquisition unit is arranged on a supporting mechanism, which includes an L-shaped supporting frame 9 and a supporting column 6 vertically and fixedly installed on the horizontal supporting surface of the supporting frame 9. The communication interface 4 is installed on the upper part of the supporting column 6 and is connected to the data acquisition and recording unit 5 through a data cable. The aeration multi-parameter measurement unit 10 can be adjusted up and down on the supporting column 6 in turn through a positioning locking piece 8 and a rotary fastener 7.

[0025] The support column 6 is made of high-strength material and has good pressure-bearing performance. It can be processed with stainless steel composite pipes and fixed to the support frame 9 by welding or bolting. The support frame 9 can be processed with stainless steel composite plates, and a pulley is installed at the bottom to move the position. The support column 6, the rotary fastener 7 and the positioning locking member 8 are used for the telescopic adjustment of the aerated multi-parameter collection and measurement end within a certain range, so as to realize the flexible movement and leveling of the aerated multi-parameter collection and measurement end and ensure the stability and accuracy during the measurement process. The aerated multi-parameter collection and measurement unit 10 is fixedly connected to one end of the positioning locking member 8, and the other end of the positioning locking member 8 is fixedly connected to the rotary fastener 7. The rotary fastener 7 is threadedly connected to the support column 6. The rotary fastener 7 can be adjusted up and down on the support column 6 to realize the height adjustment of the aerated multi-parameter collection and measurement unit 10 within the set range. The aerated multi-parameter collection and measurement unit 10 is connected to the communication interface 4 through a signal transmission line 13 running through the interior of the positioning locking member 8.

[0026] like Figure 2 As shown, the aeration multi-parameter measurement unit 10 includes a sensor component 11 for comprehensively collecting parameter data during the water flow aeration process. The sensor component 11 is connected to the communication interface 4 via a signal transmission line 13 to send the collected data to the data acquisition and recording unit 5.

[0027] The sensor assembly 11 includes an aeration concentration sensor, a flow rate sensor, a pulsating pressure sensor, a time-averaged pressure sensor, a flow sensor, and a water depth sensor, which are used to measure the aeration concentration, flow velocity, pulsating pressure, time-averaged pressure, flow rate, and water depth, respectively. Among them:

[0028] 1. The aeration concentration sensor can be selected: CQ6-2005 aeration concentration meter or CQ6-2004 aeration concentration meter.

[0029] 2. Flow rate sensors can be selected: ultrasonic flow meter: model such as LS-300; or electromagnetic flow meter: model such as LD-100; or laser Doppler flow meter: model such as LDA-3000.

[0030] 3. Pulsating pressure sensor and time-averaged pressure sensor can be selected from: piezoresistive pressure sensor: model such as MPS-100; or piezoelectric pressure sensor: model such as PE-200; or differential pressure sensor: model such as DP-300.

[0031] 4. Flow sensors can be selected: electromagnetic flowmeter: model such as EFM-500; or ultrasonic flowmeter: model such as UF-200; or vortex flowmeter: model such as VS-100.

[0032] 5. Water depth sensor can be selected: ultrasonic water level meter: model such as UW-100; or pressure water level meter: model such as PW-200; or radar water level meter: model such as RW-300.

[0033] The waterproof ratings of the aeration concentration sensor, flow rate sensor, pulsating pressure sensor, time-averaged pressure sensor, flow sensor and water depth sensor are all IP68.

[0034] The power line 12 and the signal transmission line 13 are shielded cables to ensure the stability and anti-interference ability of data transmission. In addition to considering the power supply of the indoor power box, the power supply 14 can also be powered by a battery. The control panel can control the start and stop of data collection of each part of the detector.

[0035] The multi-parameter measurement system for low-pressure water flow aeration model test of the utility model is divided into a measurement part and a data processing part.

[0036] Since the design of the low-pressure water flow aeration model test follows the gravity similarity criterion, the adjustment of the aeration multi-parameter integrated measurement unit by the screw-adjustable fasteners and the positioning locking parts are designed according to the design geometry scale Lr of SL155-95 "Hydraulic (conventional) model test regulations", which can be appropriately simplified. The positioning and debugging of the screw-adjustable fasteners and the positioning locking parts are placed according to the position of the protection area with actual measurement requirements. The measurement is debugged according to the test design conditions.

[0037] The control panel controls the data acquisition and recording unit to start the data acquisition program. According to the preset sampling time and frequency, the measured parameters are transmitted to the data acquisition and recording unit in real time through the communication interface. The data acquisition and recording unit uses the installed software to store data. After the data acquisition is completed, the data processing software is used for data analysis and visualization. Finally, the control panel sends instructions to the data acquisition and recording unit, and the control measurement phase ends.

[0038] The data processing part includes multi-parameter comprehensive analysis.

[0039] During the model test measurement, based on the collated record data of each measurement unit period, the multi-parameter comprehensive analysis includes comparison of the time-course change lines of aeration concentration, flow velocity, pulsating pressure, time-averaged pressure, flow rate and water depth, identification of characteristic correlation factors of aeration, and comprehensive analysis of the macro-micro system response of the spatiotemporal distribution characteristics of aerated water flow.

[0040] In summary, the multi-parameter measurement system for low-pressure water flow aeration model test of the utility model can be used to measure the water flow aeration model in a pressure reduction box, and the measurement results can be extended to the study of aeration cavitation reduction. The characteristic values ​​of each parameter measured are compared with the basic data of water flow aeration parameters changing with time and position, which can be used for the comprehensive optimization of water flow aeration cavitation prevention and reduction measures.

[0041] In order to further understand this invention patent, please refer to the attached Figure 3 The characteristics and measurement methods of the measurement system are further explained with specific examples.

[0042] For the design of spillway of a hydropower station, please refer to the attached Figure 3 In a model test simulating a low-pressure environment, the measurement system of the utility model is used to measure data at different measuring points. The specific measurement method is described as follows. After locating the measuring point, first adjust the position, height and angle of the aeration multi-parameter measurement unit 10 through the rotary fastener 7, accurately locate the sensor assembly 11 at the measuring point, and the test personnel operate the device button 2 to turn on the device. The edge of the sensor assembly 11 is coated with plasticine for protection, and the support frame is welded and processed with galvanized square steel and angle steel and other accessories. Start the sensor assembly 11 and the power supply 14. The time for drawing samples at a measuring point is more than 90s, and the measurements include flow velocity (m / s), pulsating pressure (kPa), time-averaged pressure (kPa), flow rate (m 3 / s), water depth (m) and aeration concentration, the data are transmitted to the communication interface 4 through the signal transmission line 13, and the data can be displayed on the display screen 1 after being processed by the data acquisition and recording unit 5. The operator can view the specific results of each parameter and output, process and visualize the data through the control tablet 3. Similarly, the sensor component 11 can be moved to the next measuring point for similar operations. After the measurement work of all measuring points is completed, the above steps can be repeated on this basis to obtain the basic data of each measuring point.

[0043] Since the decompression test needs to be carried out in a decompression box, the operator cannot continue to operate in the decompression box after the test starts. The operator can choose to set the data output form, data analysis, data visualization and report generation of each sensor before the test starts. There is no need to operate again during the test, and related operations can still be performed after the test. But at the same time, another advantage of the system is that it can be used for cloud services and remote control. The system provides cloud services and remote control functions. In addition, the system's real-time data analysis system can not only display data in real time, but also perform real-time data processing. The system can display data as a processing method set in advance by the operator, for example: all measurement parameters of the same measuring point can be recorded and compared after the measurement of the next measuring point is completed. At the same time, the system is installed with relevant software for automatic diagnosis and maintenance, such as TeamViewer, which can realize intelligent diagnosis within the system and issue prompts when a fault occurs.

[0044] Therefore, the fusion of multi-parameter characteristic indicators and their mutual response relationships of low-pressure water flow aeration are expected to achieve coordinated measurement and specific quantification based on this measurement system, thereby laying the foundation for establishing a feedback prediction system for the macro-micro effects of water flow aeration in hydropower stations under low-pressure environments.

[0045] The above specific implementations are merely illustrative and not restrictive. Under the guidance of the present utility model, a person skilled in the art can make many modifications without departing from the purpose of the present utility model and the scope of protection of the claims. All of these belong to the protection scope of the present utility model.

Claims

1. A multi-parameter measurement system for low-pressure water flow aeration model test, which is composed of a control and data processing unit and a data acquisition unit, and is characterized in that: The data acquisition unit comprises an aeration multi-parameter centralized measurement unit (10) for data acquisition, and a communication interface (4) connected to the aeration multi-parameter centralized measurement unit (10) via a data line for transmitting data collected by the aeration multi-parameter centralized measurement unit (10) to a control and data processing unit, wherein the communication interface (4) is connected to a power supply (14) via a power line (12); the control and data processing part comprises a display screen (1) for real-time display of measurement data, a device button (2), a control panel (3) with a built-in controller mainboard, and a data acquisition and recording unit (5), wherein the display screen ( 1) respectively connect the device button (2) and the data acquisition and recording unit (5) for real-time display of measurement data, the control panel (3) is connected to the data acquisition and recording unit (5), and the data acquisition and recording unit (5) is controlled to start and stop data acquisition through the built-in controller mainboard, the data acquisition and recording unit (5) is connected to the communication interface (4) through a USB or Ethernet interface, and is used to obtain measurement data from the aeration multi-parameter integrated measurement unit (10), and the controller mainboard is an embedded controller of model KB9012 or IT8528, or a touch screen controller of model GSL1680F QFN40.

2. The multi-parameter measurement system for low-pressure water flow aeration model test according to claim 1 is characterized in that: The control and data processing unit is arranged in a control box (15); wherein the display screen (1), device buttons (2) and control panel (3) are embedded in the surface of the control box (15), and the data acquisition and recording unit (5) is arranged in the lower part of the control box (15).

3. The multi-parameter measurement system for low-pressure water flow aeration model test according to claim 1 is characterized in that: The data acquisition unit is arranged on a support mechanism, and the support mechanism comprises an L-shaped support frame (9) and a support column (6) vertically and fixedly mounted on a horizontal support surface of the support frame (9); the communication interface (4) is mounted on the upper part of the support column (6) and connected to the data acquisition and recording unit (5) via a data line; the aeration multi-parameter measurement unit (10) is mounted on the support column (6) in a manner that it can be adjusted up and down via a positioning locking piece (8) and a rotary fastener (7).

4. The multi-parameter measurement system for low-pressure water flow aeration model test according to claim 3 is characterized in that: The aeration multi-parameter integrated measurement unit (10) is fixedly connected to one end of the positioning locking piece (8), and the other end of the positioning locking piece (8) is fixedly connected to the rotary fastener (7). The rotary fastener (7) is threadedly connected to the support column (6). The rotary fastener (7) can be adjusted up and down on the support column (6) to achieve height adjustment of the aeration multi-parameter integrated measurement unit (10) within a set range. The aeration multi-parameter integrated measurement unit (10) is connected to the communication interface (4) via a signal transmission line (13) that runs through the interior of the positioning locking piece (8).

5. The multi-parameter measurement system for low-pressure water flow aeration model test according to claim 1 is characterized in that: The data acquisition and recording unit (5) is composed of a computer.

6. The multi-parameter measurement system for low-pressure water flow aeration model test according to claim 1 is characterized in that: The aeration multi-parameter integrated measurement unit (10) comprises a sensor component (11) for comprehensively collecting data of various parameters during the aeration process of the water flow. The sensor component (11) is connected to the communication interface (4) via a signal transmission line (13) and is used to send the collected data to the data collection and recording unit (5).

7. The multi-parameter measurement system for low-pressure water flow aeration model test according to claim 6 is characterized in that: The sensor assembly (11) comprises an aeration concentration sensor, a flow rate sensor, a pulsating pressure sensor, a time-averaged pressure sensor, a flow sensor and a water depth sensor, which are respectively used to measure aeration concentration, flow velocity, pulsating pressure, time-averaged pressure, flow rate and water depth.

8. The multi-parameter measurement system for low-pressure water flow aeration model test according to claim 7 is characterized in that: The waterproof ratings of the aeration concentration sensor, flow rate sensor, pulsating pressure sensor, time-averaged pressure sensor, flow sensor and water depth sensor are all IP68.

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