基于浸入实体法的双螺旋泵吸入室流动特性研究

Research of Suction chamber Flow Characteristics of Double Helix Pumpbased on Immersed Entity Method

为了获得双螺旋泵吸入室内的瞬态流动特性,基于浸入实体方法,采用CFD模拟平台,运用N-S方程和SST k-ω湍流模型对该双螺旋泵典型设计工况进行瞬态数值模拟,得到了矩形螺杆泵吸水室内部的流动脉动特性。研究表明:吸入室内压力脉动主要由双螺杆旋转时所形成的密闭容积的周期性开合所导致,主要为转频和转频的倍频脉动;内部流动压力和速度分布不均也主要由双螺杆旋转时所形成的密闭容积的周期性开合所导致,负压和旋涡主要从封闭容积区域产生并沿轴向向吸入口传播,沿径向扩散。

In order to obtain the transient flow characteristics in the suction chamber of the double helix pump,,the flow pulsation characteristics inside the suction chamber of the double helix pump are obtained by using CFD software and immersed entity method and N-S and SST k-ω equation.The results show that the pressure pulsation in the suction chamber is mainly caused by the periodic opening and closing of the closed domain of the volume formed by the double-screw rotation,which is mainly the frequency-doubling pulse.The pressure field and the vorticity field analysis show that the uneven of pressure and velocity distribution of internal flow are also mainly caused by the periodic opening and closing of the closed volume formed when the twin-screw is rotated,and the negative pressure and the vortex are mainly generated from the enclosed volume area and spread in the axial direction to the suction inlet and in the radial direction.