Research progress in rotating stall in mixed-flow pumps with guide vane
LI Wei1,2*, PING Yuanfeng1,2, SHI Weidong3, JI Leilei1,2, LI Enda1,2, MA Lingling1,2
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Institute of Fluid Engineering Equipment, JITRI, Zhenjiang, Jiangsu 212009, China; 3. College of Mechanical Engineering, Nantong University, Nantong, Jiangsu 226019, China
Abstract：Rotating stall is a widespread unstable phenomenon of internal flow in rotodynamic machines, such as mixed-flow pumps and so on, and has a vital influence on performance and even safety of the machines. In this paper, manifestation, inception, formation and propagation mechanisms of the rotating stall are analyzed in terms of performance curve, internal flow structure and pressure fluctuation characteristics in both time and frequency domains in mixed flow pumps with guide vane. A few key factors affecting formation and development of the stall are discussed. Typical manifestations for the rotating stall occurrence in mixed-flow pumps with guide vane include positive slope(saddle shape)in various forms in the head-flow rate curve, and periodically propagating vortex structure in the internal flow field. The unsteady vortex structure can result in a blockage in the flow passages, and subsequently lead to unstable pressure fluctuation. The analysis of leakage vortex morphological structure and motion trajectory provides a new idea for the study on the stall inception in a mixed-flow pump with guide vane. Flow condition is the most direct factor leading to the rotating stall in the pump, especially, the number of stall cells will be impacted significantly with decreasing flow rate. In addition, the number of blades, impeller speed and tip clearance are also the important factors affecting number, propagation speed and development process of stall cells. Based on the research status in rotating stall in recent years in China and abroad, the issue and orientation for further research in the stall in mixed-flow pumps with guide vane in the future are put forward.
李伟,*,平元峰,,施卫东,季磊磊,,李恩达,,马凌凌,. 导叶式混流泵旋转失速的研究进展[J]. 排灌机械工程学报, 2019, 37(9): 737-745.
LI Wei,*, PING Yuanfeng,, SHI Weidong, JI Leilei,, LI Enda,, MA Lingling,. Research progress in rotating stall in mixed-flow pumps with guide vane. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(9): 737-745.
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