This research utilizes the Ω vortex identification method to address the turbulent flows in a single-stage side channel pump, to comprehensively characterize the three types of dynamic vortex structures classified based on directions. Premised on the Galilean invariance, the work employs coordinate rotation and transformation. Thus, the indistinguishable 3-D vortex can be simplified to 2-D vortex on typical research planes. When juxtaposing the overall performance, it was revealed that a diversity of areas with high values yielded enhanced reflection of the vortex intensity, as measured by velocity distribution. The axial vortex structure with high intensity exists at the outer radius under all conditions largely. While the longitudinal vortex usually shows high intensity between the middle and outer radius. Simultaneously, the radial vortex is more likely to be at the inner radius near the suction face. Finally, this paper introduces a specific value ξ, which represents the ratio of decomposition to the total of the manifestation of the fluid rotational pattern. From the fluctuation and mean value, it can be realized that the development of the specific vortex in three directions at different positions. For example, the specific value ξ2 refers to the typical longitudinal vortex as dynamic vortex are almost from 20％ to 50％, which illustrates that the longitudinal vortex only occupies a minor percentage in the total vortex. This phenomenon is one of the main reasons for the low efficiency. The present work could provide some suggestions and references for in-depth studies in fluid engineering with intense swirling flows.

Ke Chen;Fan Zhang;Yu-jian Fang;Desmond Appiah;Shou-qi Yuan;Feng Hong

National Research Center of Pumps,Jiangsu University,Zhenjiang 212013,China;Quality Inspection Center for Pump Products in Zhejiang Province,Wenling 317599,China;College of Mechanical and Power Engineering,China Three Gorges University,Yi Chang 443000,China

水动力学研究与进展B辑

[1]Ke Chen;Fan Zhang;Yu-jian Fang;Desmond Appiah;Shou-qi Yuan;Feng Hong-.A decomposition method of vortex identification and its application in side channel pumps)[J].水动力学研究与进展B辑,2022(06):1106-1120

Premised,Galilean,juxtaposing

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