中文摘要：

高比转速离心泵由于流道较宽,叶片扭曲较大,基于一元理论的传统离心泵叶片设计方法并不适用。本文对一种采用速度系数法设计的高比转速（ns=271）潜水泥泵叶轮进行了泵内三维流场的数值模拟;根据泵内流动计算结果,基于涡动力学的边界涡量流（BVF）诊断方法,通过调整叶片设计参数和轴面流线对泵的叶轮进行了优化。结果表明;优化后的泵水力性能得到了较大改善;借助BVF的流场诊断方法可有效地捕捉到泵内不良流动的根源,从而为改善叶片设计指引方向。

英文摘要：

The traditional design method based on one-dimension theory is not suitable for the design of a high specific-speed centrifugal pump due to its broad flow passage and twisted blade. This paper treats a submersible dredge pump impeller with a high specific-speed（n_s=271） designed by using the conventional velocity coefficient method,and the three dimensional flow field inside the pump was numerically simulated.Based on the internal flow of the pump and the boundary vorticity flux（BVF） method,the design optimization for the pump impeller was conducted by adjusting the geometrical parameters and modifying the meridional shape of the blade.Those results indicate that the hydraulic performance of the pump was improved by the impeller design optimization;The BVF based flow field diagnosis method is helpful for capturing effectively the flaw of unfavorable flows and depicting the direction for optimizing the impeller blade.