Study on characteristics of muddy water flow field in gravity sand sedimentation pool for drip irrigation with river water
TAO Hongfei1, QI Yinxin2, YANG Haihua1, MA Yingjie1, ZHAO Jinghua1, ZHENG Wenqiang1, LIU Yali1
1. College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China; 2. Hydraulic Engineering Research Institute, Xinjiang Institute of Water Resources and Hydropower Research, Urumqi, Xinjiang 830049, China
Abstract：Gravity sand sedimentation pool(GSSP)for drip irrigation with river water is a new measure of removing sediment in hydraulic engineering. It has been proved to be a highly efficient water-saving technique since it needs less land, smaller investment, easier maintenance, larger control area, no energy consumption, and lower operation cost. To study the hydraulic performance and flow field characteristics of GSSP, the standard k-ε turbulence model and mixture model were adopted to calculate the sand-water two phase flows in the grit chambers of a GSSP. The numerically simulated results were contrasted with the experimental data, and it was found that the numerical data are in good agreement with the measurements on a physical model. It suggests that the mathematical model adopted can simulate the sand-water two phase flows in the chamber with a certain accuracy and reliability. Based on velocity distributions in the vertical direction, a velocity profile has three different patterns, rapid increase, quick decrease and constant pattern. The sand concentration profile showed four different layers, namely pure water layer, constant concentration layer, subsidence layer and compressed layer. Based on simulated flow fields, a measure should be implemented in the last grit chamber and lateral weir to avoid local reverse flows and vortexes because they can take sediments away with filtered water. As a result, the water-sediment separation efficiency can be improved.
陶洪飞, 戚印鑫, 杨海华, 马英杰,赵经华, 郑文强, 刘亚丽. 河水滴灌重力沉沙过滤池中浑水流场分布规律[J]. 排灌机械工程学报, 2017, 35(9): 785-791.
TAO Hongfei, QI Yinxin, YANG Haihua, MA Yingjie, ZHAO Jinghua, ZHENG Wenqiang, LIU Yali. Study on characteristics of muddy water flow field in gravity sand sedimentation pool for drip irrigation with river water. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(9): 785-791.
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