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Vortex-induced energy loss of a mixed-flow waterjet pump under different operating conditions

不同流量工况下混流式喷水推进泵涡流所致能量损失

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Abstract

Mixed-flow waterjet pumps (M-FWPs) are core units of high-speed ship power propulsion. When operated under non-optimal operating conditions, the unstable flow generated in the flow passage leads to a reduction in pump efficiency. This article investigates the energy loss mechanism of M-FWPs under different operating conditions through entropy production theory based on numerical simulations. The analyses of the simulation data show that the turbulence dissipation (EPTD) makes the dominant contribution to the entropy production rate. By comparing the correlations of velocity gradient, vorticity, and turbulent kinetic energy (TKE) with the EPTD, it is discovered that under non-optimal operating conditions, the inflow angle at the impeller inlet does not match the blade inlet angle at the leading edge of the blade, resulting in unsteady flow structures such as flow separation and large-scale vortices. The increase in vorticity and TKE caused by these unsteady structures ultimately causes the generation of turbulent entropy. Further examination of the enstrophy transport equation indicates that the relative vortex generation term plays a dominant role in the development of the unsteady flow in the flow passage.

摘要

混流式喷水推进泵(M-FWPs)是高速船舶动力推进的核心部件. 当其在非最优工况下运行时, 流道中的不稳定流动会导致泵效 率的下降. 本文通过数值模拟, 基于熵产理论研究了在不同工况下的能量损失机理. 对仿真数据的分析表明, 熵产率主要由湍流耗散产 生. 通过比较速度梯度、涡度、湍动能以及湍动能耗散的相关性, 发现在非最优工况下, 由于叶轮进口入流角与叶片前缘进口角的不 匹配, 会导致流动分离和大尺度漩涡等非稳定流动结构的发生. 这些非定常流动现象所导致的涡量和湍动能增强最终引起了熵增. 进 一步检验拟涡能的输运发现涡生成项在非定常流动的产生过程中扮演了主要角色.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 52009033 and 11972038), the Natural Science Foundation of Jiangsu Province (Grant No. BK20200509), and the Postdoctoral Research Foundation of China (Grant Nos. 2022M711021 and 2021M690876).

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Authors and Affiliations

  1. College of Energy and Electrical Engineering, Hohai University, Nanjing, 211100, China

    Kan Kan  (阚阚) & Yuhang Xu  (徐宇航)

  2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China

    Kan Kan  (阚阚) & Hui Xu  (徐辉)

  3. College of Agricultural Science and Engineering, Hohai University, Nanjing, 210098, China

    Hui Xu  (徐辉) & Jiangang Feng  (冯建刚)

  4. Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China

    Zixuan Yang  (杨子轩)

Authors
  1. Kan Kan  (阚阚)
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  2. Yuhang Xu  (徐宇航)
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  3. Hui Xu  (徐辉)
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  4. Jiangang Feng  (冯建刚)
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Contributions

Kan Kan designed the research, offered methodology and computing resources, carried out all the simulations and results analysis, wrote the first draft of the manuscript, and offered funding acquisition. Yuhang Xu carried out all the simulations and results analysis, wrote the first draft of the manuscript. Hui Xu offered computing resources, verified the results, wrote the first draft of the manuscript and supervised the research. Jianggang Feng offered computing resources, verified the results and supervised the research. Zixuan Yang designed the research, offered methodology, analyzed the results, supervised the research, offered funding acquisition and revised the final version.

Corresponding author

Correspondence to Zixuan Yang  (杨子轩).

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Kan, K., Xu, Y., Xu, H. et al. Vortex-induced energy loss of a mixed-flow waterjet pump under different operating conditions. Acta Mech. Sin. 39, 323064 (2023). https://doi.org/10.1007/s10409-023-23064-x

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  • DOI: https://doi.org/10.1007/s10409-023-23064-x

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