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| Hydraulic characteristics of spring platetype measuring device in open channel |
| WAN Li, LI Yongye*, ZHANG Gang, CAI Hongru, ZHANG Xuelan, YANG Xiaoni |
| College of Hydro Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China |
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Abstract In order to improve the accurate water measurement technology in irrigation areas, a flow measurement device for open channel was designed based on the relationship between spring shape va-riable and instantaneous flow of channel water cross section. The model test of the device was conducted in a rectangular channel with a selected flow range of 20-85 m3/h under 14 flow conditions. The theoretical analysis and numerical simulation were combined to analyze the flow equation, flow measurement accuracy, head loss and other measurement characteristics of the device. The research results indicate that the instantaneous flow rate Q of the channel overflow section shows a 5/6th power relationship with the sum of the shape variable d and parameter C1, and the linear correlation between Q and the 5/6th power of d+C1 is good when the width of the measuring plate is 30, 40, 50 and 60 mm. The flow rate formula of the spring-plate flow measuring device was obtained by fitting, the calculated flow rate was consistent with the measured flow rate during the test, the maximum relative error was 4.56%, and the maximum relative error was 1.43% when the plate width was 40 mm. The maximum relative error between the simulated and measured water levels is 4.54%, and the simulated results agree with the measured ones; the head loss generated by the measuring plate increases with the increase of the plate width, and the head loss accounts for less than 10% of the total head when the plate width is less than 40 mm. The research results provide a theoretical basis for the application of spring-loaded plate flow measurement device in irrigation areas.
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Received: 27 July 2021
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