Experiment on hydraulic performance of selfcleaning screen filter
LIU Huan-Fang-1, LIU Fei-2, GU Chen-Chen-3, ZONG Quan-Li-1, 2 , LUO Xiu-Ping-1
(1.College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003, China; 2.State Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China; 3.Shanghai Institute of Aerospace and Industry Electric Co. Ltd., Shanghai 200436, China)
The hydraulic performances were experimented by using clean and muddy water, respectively. The filter minor head loss coefficient was measured at various flow rates (0-230 m3/h) for clean water. The filter sand filtration and drainage behaviors were studied in muddy water. Firstly, the minor head loss coefficients were measured at various sand concentrations in the muddy water at the highest flow rate 230 m3/h. Secondly, the coefficients were tested once again at various flow rates for a constant sand concentration of 0.19 g/L. The optimal periods of time for discharge of sands were measured at a series of given pressure differentials across the filter, however, for the drainage behavior. The results show that for the clean water the coefficient is increased slowly in increasing flow rate in 0-140 m3/h, however, it rises rapidly when the flow rate is 140-230 m3/h. The empirical formulas have been proposed based on those head loss experimental data. For the muddy water, once the head loss is beyond 6-7 m, the loss will be increased rapidly with sediment concentration. During the experiments on drainage behavior, when the period of time for drainage sand reaches 20 s, the sediment concentration downstream tends to keep stable and a good result is achieved sand drainage, suggesting the optimal drainage time is in 20-30 s under the given pressure difference of 0.07 MPa across the filter.
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