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Impact of fish locomotion on the internal flow in a jet fish pump

机译：鱼运动对喷射鱼泵内流的影响

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摘要

Stressed by complex internal flows, fish has a special locomotion feature different from the cruise in a jet fish pump. Based on the high-speed photography and dynamic mesh technologies, the present paper proposed a new numerical simulation methodology to study the impact of fish locomotion on the internal flow in a jet fish pump. The results show that both single fish and fish shoal can cause wall static pressure peaks. Fish causes a rise of static pressure around its body and the pressure increment increases as primary flow rate grows. Fish shoal can result in a decrease of the measured value of mixed flow rate, yet the locomotion of single fish shows no significant effect on it. As the rise of axial velocity difference between internal flow and fish, a low axial velocity region closed to fish body downstream expands. Fish locomotion has a significant effect on the recirculation region. The recirculation region firstly breaks and then forms again when fish passes through this region. The investigation results are helpful to understand the change of flow field in jet fish pumps disturbed by fish and provide reference for design and optimization of jet fish pumps. This new methodology also provides a solution for simulating of moving object in flow fields.
机译：由于复杂的内部流动，鱼的运动特性与喷射鱼泵中的巡航不同。基于高速摄影和动态网格技术，本文提出了一种新的数值模拟方法，以研究鱼运动对射流鱼泵内流的影响。结果表明，单条鱼和鱼滩均会引起壁静压力峰值。鱼会引起其身体周围的静压升高，并且随着初级流量的增加，压力增量会增加。鱼群会导致混合流量的测量值降低，但是单条鱼的运动对其没有明显影响。随着内部流和鱼之间的轴向速度差的增加，靠近鱼体下游的低轴向速度区域会扩大。鱼的运动对再循环区域有重大影响。当鱼通过该区域时，回流区域首先破裂，然后再次形成。研究结果有助于了解鱼类干扰的喷射鱼泵流场的变化，为喷射鱼泵的设计和优化提供参考。这种新方法还提供了一种模拟流场中移动物体的解决方案。

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  • 来源
    《Ocean Engineering》 |2019年第1期|106227.1-106227.9|共9页
  • 作者

    Xu Maosen; Long Xinping; Mou Jiegang; Ji Bin; Ren Yun;

  • 作者单位

    China Jiliang Univ Coll Metrol & Measurement Engn Hangzhou 310018 Zhejiang Peoples R China;

    Wuhan Univ Hubei Key Lab Waterjet Theory & New Technol Wuhan 430072 Hubei Peoples R China|Wuhan Univ State Key Lab Water Resources & Hydropower Engn S Wuhan 430072 Hubei Peoples R China;

    Wuhan Univ State Key Lab Water Resources & Hydropower Engn S Wuhan 430072 Hubei Peoples R China;

    Zhejiang Univ Technol Zhijiang Coll Hangzhou 310024 Zhejiang Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Jet fish pump; Fish locomotion; Dynamic mesh; High-speed photography;

    机译：喷射鱼泵;鱼的运动;动态网格高速摄影;

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