摘 要：为获得矩形双螺杆泵内部全流道的瞬态流动特性，基于浸入实体方法，采用CFD模拟平台，运用N-S方程和标准 k-ɛ湍流模型对给定基本参数的螺杆泵典型设计工况进行瞬态数值模拟，得到了螺杆泵各过流部件在运转过程中的流动信息。计算表明:压力从进口到出口烟螺旋槽逐渐升高，增压效果明显，泵体各断面最大压差约280 kPa；进口区域流场较为紊乱，互相啮合的转子螺旋槽内由于压差较大、速度较高，最大速度约11 m/s，在转子与泵壳壁面接触区域存在少量负轴向速度，为主要泄漏区域，泄露量较小，密封性能较好。

Abstract:In order to obtain the transient flow characteristics of the full flow channel inside a rectangular twin screw pump,based on immersed solid method and CFD simulation,the N-S equation and the standard k-ɛ turbulence model were used to simulate the typical design conditions of the screw pump with given basic parameters.The flow information inside the screw pump during operation was obtained.The calculation results showed that the pressure increases gradually from the inlet to the outlet along the spiral groove,the supercharging effect is evident,and the maximum pressure difference of each section of the pump body is about 280 kPa.The turbulence in the inlet area is strong.In the spiral grooves of intermeshing rotors,the velocity is relatively high due to the large pressure difference,with the maximum velocity of about 11 m/s.There is a small negative axial velocity in the contact area,which is the main leakage area.The leakage amount is small and the sealing performance is reliable.

TB126

国家自然科学基金(51279172);四川省流体机械重点实验室开放研究基金(szjj2016-002)