不同泥沙粒径下的分离鳃内部流场三维数值模拟

摘要

Three-dimensional numerical simulation adopting the laminar model and Euler model were conducted to the flow field of water-sediment two-phase in gill-sheet separation device to study how the sediment grain size effects upon velocity field and water-sediment separation by using PC-SIMPLE algorithm. The results show that the velocity flow is the same in the gill-sheet separation device when sediment grain size ranges from 0.005 mm to 0.035 mm and when the it is different the sediment grain size is 0.000 1 mm. The best performance is observed when gill-sheet separation device handles sediment grain size that ranges from 0.015 mm to 0.035 mm. Additionally, the greater sediment grain size is, the higher removal is. Meanwhile the faster the water-sediment separation is.%为研究泥沙粒径对分离鳃的速度场及水沙分离效果的影响，采用层流模型和欧拉模型，运用PC-SIMPLE算法，对分离鳃内的水沙两相流流场进行了三维数值模拟。计算结果表明：当泥沙粒径d=0.0001 mm时，分离鳃内的流场与其他泥沙粒径时有所不同；当0.005 mm≤d≤0.035 mm时，分离鳃内不同粒径泥沙水流的流场相同；当0.015 mm≤d≤0.035 mm时，分离鳃处理泥沙效果最好，且泥沙粒径越大，去除率越高，水沙分离速度就越快。