喷水推进泵非均匀进流研究进展

针对喷水推进泵运行过程中存在的非均匀进流，从驱动轴扰动、船舶边界层厚度以及进水流道结构等方面分析了非均匀进流的成因，探讨了进口速度比IVR和船舶航行速度对不均匀度产生的影响，总结了非均匀进流的不良效应.当进口速度比IVR以及船速增加时，进流面不均匀度也随之增加，进流品质逐渐恶化.非均匀进流下，泵进流面存在径向速度与压力梯度，导致喷水推进泵在工作过程中会出现回流、二次流、流动分离等失稳现象，内部涡旋扰动代替系统扰动催生失速，导致能量耗散.同时，叶片载荷、空泡体积分布以及压力脉动也呈现出高度不均匀性.基于近年来国内外对非均匀进流的研究现状，提出了喷水推进泵非均匀进流需要进一步深入研究的内容和方向.

Research progress of non-uniform inflow of water jet pump

In view of the non-uniform inflow during the operation of the water jet pump, the reasons for the non-uniform inflow were analyzed from the aspects of drive shaft disturbance, ship boundary layer thickness, and water inlet channel structure, and the inlet speed was compared with the IVR and ship sailing speed. On the impact of unevenness, the adverse effects of non-uniform inflow were summarized. When the inlet speed is higher than the IVR and ship speed, the unevenness of the inlet surface also increases, and the inlet quality gradually deteriorates. Under non-uniform inflow, there are radial velocity and pressure gradients on the inlet surface of the pump, causing the water jet pump instability such as backflow, secondary flow, and flow separation in the working process. The internal vortex disturbance replaces the system disturbance to cause stalling, resulting in energy dissipation. At the same time, blade load, cavitation volume distribution and pressure pulsation also show a high degree of non-uniformity. Based on the research status of non-uniform inflow at home and abroad in recent years, the content and direction of the non-uniform inflow of water jet pump are proposed.