开式和闭式离心泵进口回流的研究

STUDIES ON INLET REVERSE FLOW FOR OPEN-TYPE AND CLOSED-TYPE CENTRIFUGAL PUMP

利用毕托管对闭式和开式不同叶顶间隙的离心泵叶轮进口流场进行了动态测试，另外对开式叶轮吸入盖上的静压分布也进行了动态测试，并对叶轮流道内流场进行了可视化观察，弄清了小流量工况下叶片间的回流分布情况及上述不同叶轮对回流发生的影响及其原因。

篣nsteady flows at the impellers entrance were measured by the pilot tubes for a closed impeller and open impellers with different blade tip clearances.The flow visualizations in the open impeller were also performed. As a result, the reverse flow pattern between two neighbouring blades and the effect of the impellers mentioned-above on the inlet reverse flow starting point were clarified.