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Research on the flow characteristics and energy variation characteristics of the outlet passage of a two-way flow pump device based on Liutex and energy balance equation method

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  • Wang, Yuqi
  • Cheng, Li

Abstract

This paper analyzes the flow state, vorticity, and energy distribution of the outlet passage of a two-way flow pump device under the pumping condition. Using the Liutex method to analyze the vortices in the outlet passage of a pump device at different moments during a cycle, it was found that the vortices at different moments can be divided into three types: lumpy vortices, strip vortices and sheet vortices. By analyzing the vortex evolution mechanism, it is found that these vortices are mainly caused by the reflux and velocity gradient along the wall, which also leads to no significant periodic variation in the vortex intensity at that location. The analysis of the energy balance equation shows that the Reynolds stress in the outlet passage causes significant kinetic energy dissipation. Lumpy and strip vortices increase energy dissipation, while sheet vortices have a smaller impact. In addition, the high-value regions of the P1 and P3 terms in the energy balance equation are closely related to the velocity gradient. This indicates that Reynolds stress not only dissipates kinetic energy during flow but also promotes a more uniform kinetic energy distribution within the water body.

Suggested Citation

  • Wang, Yuqi & Cheng, Li, 2025. "Research on the flow characteristics and energy variation characteristics of the outlet passage of a two-way flow pump device based on Liutex and energy balance equation method," Energy, Elsevier, vol. 318(C).
    • Handle: RePEc:eee:energy:v:318:y:2025:i:c:s0360544225004475
    DOI: 10.1016/j.energy.2025.134805
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