中文摘要：

基于三维不可压缩流体N-S方程和Standard湍流模型,对混流式核主泵叶轮水力模型的能量性能进行了数值预测,研究了不同叶片出口段形状（传统叶片出口段、叶片工作面修圆、叶片工作面和背面同时修圆、叶片背面修圆）对混流泵模型叶轮水力性能的影响。通过分析叶轮叶片压力面、吸力面的静压分布,获得叶片表面的载荷分布及其变化规律。结果表明：对叶片出口段进行修圆,叶轮最高效率值有所增大且高效点向大流量工况偏移;当仅对叶片工作面进行修圆,叶轮水力性能最好,从而为核主泵的水力优化设计提供参考依据。

英文摘要：

Based on the three-dimensional incompressible Navier-Stokes equation and the standard K-e turbulent model,the energy performance of the impeller hydraulic model in a mixed- flow nuclear main pump was numerically predicted. In addition,the influence of different blade trailing edges （ traditional trailing edge,ellipse on pressure side,ellipse on both sides,ellipse on suction side） on the impeller hydraulic performance in a mixed-flow p u m p model was studied. By analyzing the static pressure on impeller blade surface and the suction side,the load distri-bution on the blade surface and the change law were attained. T he result shows that when the blade trailing edge is rounded,the highest efficiency value increases and efficient points offset the large flow rate conditions,w h e n only the leading face of the vane is rounded,the hydraulic efficiency value of impeller is highest. Then the referential basis for the hydraulic optimization design for a nuclear main pumpis provided.