导边与随边设计对喷水推进泵性能的影响

采用相同的叶片轴面流线载荷分布和叶轮出口环量分布规律，改变导边与随边位置设计出多个喷水推进泵叶轮。基于雷诺时均的N-S方程、SST湍流模型和多重参考坐标系对叶轮内流场进行数值模拟，结果表明：导边向进口适度延伸可减小叶片进口边的载荷，利于提高空化性能，但效率有所降低；随边倾斜参数与叶轮出口的轴面速度分布和叶片表面的压力分布特性关联。

Effects of Leading edge and Trailing edge onPerformances of Waterjet Pump

The meridional derivative of circulation Vur was adopted as the control parameter of blade loading distributions, the same Vur distribution of the meridional streamlines and the impeller exits were loaded, a series of waterjet mixed-flow impellers were obtained with different leading edges and different trailing edges. The RANS equations embedded with SST turbulence model were solved by using multiple-reference-frame model to simulate flow field of the pumps. The results showed that when the leading edge extended to the impeller inlet, the cavitation performance was improved but additional friction loss generated. Different trailing edges had obvious influence on the spanwise distributions of the meridional velocity at impeller exit and the blade pressure distributions.