Vortex identification and its evolution law of mixed-flow pump under low-flow condition
ZHAO Binjuan1*, LIU Yulu1, HAN Luyao1, CAO Kefan1, CHEN Huilong1, HUANG Zhongfu2
1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, China
Abstract：In order to study evolution law of the flow state and vortex structure of a mixed-flow pump under low-flow conditions, the large eddy simulation and the advanced Omega vortex identification method were used in this paper to identify the vortex structure in a mixed-flow pump under low-flow conditions. The characteristics and evolution law of the typical vortex structures in the impeller were obtained, and compared with the generation of vortices and flow separation on the blade surface. The results were compared with vorticity generation and flow separation on blade surface. The results show that the Omega method overcomes the problem that the second generation vortex identification method needs to adjust the threshold value manually, and can identify the fine vortex structure in the mixed-flow pump under the condition of low-flow. Under low-flow conditions, the vane oblique vortex belt, tip vortex, tip separation vortex, passage vortex and trailing edge separation vortex in the mixed-flow pump are typical vortex structures generated in the impeller passage. They have their own independent gene-ration and development process, and interact with each other, making the flow field in the impeller more chaotic. This study reveals the unique vortex structure characteristics and evolution laws in the mixed-flow pump under low-flow conditions, which can provide a theoretical guidance and technical support for the flow field analysis and performance optimization of turbomachinery including mixed-flow pump.
赵斌娟*,刘雨露,韩璐遥,曹可凡,陈汇龙,黄忠富. 小流量工况下混流泵涡识别及其演变规律[J]. 排灌机械工程学报, 2023, 41(3): 231-238.
ZHAO Binjuan*,LIU Yulu,HAN Luyao,CAO Kefan,CHEN Huilong,HUANG Zhongfu. Vortex identification and its evolution law of mixed-flow pump under low-flow condition. Journal of Drainage and Irrigation Machinery Engin, 2023, 41(3): 231-238.
