【摘要】 为了了解圆形沉淀池内水流在无温差及存在温度差时的特点,建立了描述圆形沉淀池内水流运动的k-ε双层湍流数学模型,采用交错网格系统,压力与速度解耦时采用了SIMPLE方法,控制方程的求解方法为混合有限分析解法。对中心进水周边出水的圆形沉淀池的模拟结果表明所建立数学模型的模拟结果与文献中的资料吻合良好。在无温差时且低污染物浓度<150~200 mg/L时,池内存在一个很大的回流区;低温水进入高温水池时,常会产生异重流现象;高温水进入低温水池时,会产生浮力流现象。更多还原

【Abstract】 In order to investigate the flow characteristics in circular settling tanks with or without temperature difference,a k-ε two layer turbulence model was developed for this problem.In the numerical process,staggered grid system was employed,pressure and velocity were decoupled using SIMPLE method,and the hybrid finite analytical method was used to solve the governing equations.The simulation results of circular settling tanks with inlet at the center and outlet at the skirt show that the simulation results were in line with the results available in literatures.Without temperature difference and low suspended solids SS<150~200 mg/L,there would be a big recirculation region.It could cause gravity flow,if low density flow entering into the tank,while it could cause buoyant flow if high density flow entering into the tank.更多还原