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为了探明梭锥管内水沙分离的机理,在不同网格划分方案下,该文对梭锥管内的水沙两相流进行了静水沉降的数值模拟,并将计算结果与实测值进行了对比,选出了最优网格划分方案。在最优网格方案下,采用层流方程和简化的多相流Mixture模型,对梭锥管内部流场进行计算。计算结果表明:在锥圈上表面形成了“泥沙”流下沉,下表面“清水”流上升的小循环运动;作为泥沙沉降的重要边界,锥圈改变了泥沙的沉降方向,缩短了沉降距离,提高了水沙的分离效率;装置内存在水沙绕相邻锥圈形成的小循环流动和沿梭锥管边壁的清水流通道及中心的泥沙流通道做大循环的水沙流现象;两侧通道与锥圈上、下表面流速较大,其余区域流速较小。计算结果与试验结果基本一致,表明层流方程和Mixture模型耦合可以较好地模拟梭锥管内水沙两相流。
In order to find out the mechanism of water and sediment separation in shuttle pipe, under different schemes of gridding, numerical simulation of hydrostatic sedimentation in water and sediment flow in shuttle pipe was carried out. The calculated results and measured values were compared , Selected the optimal mesh scheme. Under the optimal grid scheme, the laminar flow equation and the simplified multiphase Mixture model are used to calculate the flow field inside the shuttle tube. The calculation results show that the “Cyclone” flow sinks on the upper surface of the cones and the small circulation moves upwards on the lower surface “Clear water”. As the important boundary of sedimentation, the cones change the settlement of the sediments Direction and shorten the settlement distance to improve the separation efficiency of water and sediment; device within the water and sand around the adjacent cone formed small circulation flow and along the tapered pipe wall water flow channel and the center of the sediment flow channel bigger Circulation of water and sand flow phenomenon; channel and cone on both sides of the upper and lower surface flow rate larger, the rest of the smaller flow velocity. The calculated results agree well with the experimental results, indicating that the coupled laminar flow equation and Mixture model can well simulate the flow of water and sediment in the tube.