机械式泵喷与IMP推进器的水力性能对比

Comparative analysis of the hydrodynamic performance of a mechanical pump-jet and an integrated motor pump-jet

针对机械式泵喷与集成电机推进器(IMP)泵喷存在的区别,运用计算流体力学方法预报了前置定子泵喷推进器在设计转速时的敞水性能,并在原机械式泵喷基础上修改为IMP泵喷预报其敞水性能,成功捕捉到IMP泵喷电机定转子之间气隙内逆向流动现象。对比分析两种泵喷相同转速不同进速下的水力性能,主尺度相同的IMP泵喷效率比常规泵喷效率降低约5%;消耗功率比常规泵喷有所增加且增大幅值随进速增大而增大;产生推力比常规泵喷小且减小幅值随进速增加而减小。研究结论为新型推进器的选择设计提供参考。

To analyze the difference in hydrodynamic performance between a mechanical pump-jet and an integrated motor pump-jet （IMP）, a computational fluid dynamic （CFD） method was used to predict the open water performance of a front-stator pump-jet propeller at its design speed of rotation. Then IMP was modeled based on the geometry of the mechanical pump-jet, and a numerical simulation was carried out in the same way, in which the reverse stream phenomena in the gaps between the motor＇s rotor and stator was captured successfully. The comparative anal- ysis indicates that the efficiency of an IMP is about 5 percent lower than that of the mechanical pump-jet at the same speed with a different inflow velocity. The power needed by the IMP is larger than that of the mechanical pump-jet, but the thrust of the IMP is lower. For the IMP, the amount of power required increases as the inlet velocity increases, while the thrust is smaller than that of the mechanical pump-jet ; in addition, the thrust amplitude decreases with the increase in inlet velocity. The conclusions of the research provide a reference for the selection and design of new propulsion systems.