旋喷泵集流管进口形状对水力性能的影响

采用连续方程、动量方程、交错网格和Simplec算法求解,对XP300-3型新型低比转数旋转喷射泵矩形叶轮、转子腔和集流管的内部流动进行了全三维数值模拟.分析了旋喷泵内部流动规律,得到了转子腔及集流管内部流动的速度场、压力场及湍动能的分布规律.设计了5种不同进口形状的集流管,并分别整体组合,比较了该5种模型的优劣,找到了集流管内部流动的一些规律.分析及数值模拟结果表明：集流管椭圆型进口长半轴跟转子腔半径相一致,长短半径相差不大更有利于解决过水断面充分入流的问题,进而减少其水力损失;通过对数据结果进行综合平衡分析和比较,得出了最优的参数组合.研究结果可为旋喷泵的性能预测以及集流管的优化设计和能量损失分析提供理论依据.

Influence of inlet flow of collecting pipe shape on hydraulic characteristics for roto-jet pump

The continuity equation, momentum equations have been solved in staggered grid by Simplec algorithm. A full three-dimensional numerical simulation has been done in the internal flow of the rectangular impellor, the rotor cavity and the collecting pipe. The distribution of veloeity and pressure in the colleeting pipe and the rotor cavity are shown by analyzing internal flow in the roto-jet pump. Comparing their pros and cons of the five models, especially, the shape of collecting pipe inlet has a great impact on the internal flow. The results show that the long radius axle of the elliptical import in the collecting pipe is consistent with the radius of the rotor cavity. Not too large difference for the long and short radius bene- fits resolving the cross section sufficient inflow and even reducing the hydraulic losses. The optimization parameter combination is obtained by comprehensive data balance analsis and eomparision. The results provide a theoretical basis for the roto-jet pump performance prediction, the optimization design of eolleeting pipe and analysis of energy losses.