Research progress of non-uniform inflow of water jet pump
LI Wei1,2, YANG Zhenyu1*, SHI Weidong3, LI Enda1, JI Leilei1
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Institute of Fluid Engineering Equipment Technology, Jiangsu University, Zhenjiang, Jiangsu 212009, China; 3. College of Mechanical Engineering, Nantong University, Nantong, Jiangsu 226019, China
Abstract：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.
李伟,杨震宇*,施卫东,李恩达,季磊磊. 喷水推进泵非均匀进流研究进展[J]. 排灌机械工程学报, 2022, 40(8): 757-765.
LI Wei,YANG Zhenyu*,SHI Weidong,LI Enda,JI Leilei. Research progress of non-uniform inflow of water jet pump. Journal of Drainage and Irrigation Machinery Engin, 2022, 40(8): 757-765.
