The conclusion shows that using high specific speed impeller in the first step of the two-stage axial flow pump can improve the trust and efficiency of the propulsion system.

• 针对数据库中现有的水力模型；对模型的所有排列方式进行计算；得到在两级轴流泵中首级采用高比转速的叶轮可以提高喷水推进器的推力和推进效率.