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Cavitation dynamics and thermodynamic effects at elevated temperatures in a small Venturi channel

机译：小文丘里通道升高温度下的空化动力学和热力学效应

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摘要

The effects of temperature on hydraulic cavitation dynamics are investigated under various operating conditions, in a close loop cavitation tunnel with a small-scale venturi type section. A systematic study is performed with temperatures varying between 24°C and 85°C, using a high-speed visualization system to observe the cavitating flow. The image processing methods provided in the paper present a quantitative comparison of the cavitation dynamics and structure development. The results show that the increase of the fluid temperature induces the growth of the cavitation volume up to about 55°C, thereafter an additional increase in temperature has the opposite effect. This evolution is interpreted as a competition between a Reynolds effect and the well-known thermal effect. Cavitation is more closely investigated within the temperature range 50°C - 65°C, to analyze the changes in the structure and the cavitation dynamics. For the prediction of thermal suppression head, the thermal effect parameter Σ which can be used empirically, is derived at the maximum cavitation length. This fluid thermodynamic parameter Σ(T_(trans)) at the transition peak can be referred to to avoid the maximum cavitation aggressiveness induced vibration or erosion for thermos-fluids around the thermal transition temperature. Finally, the factors influencing cavitation length and shedding frequency are presented and analyzed.
机译：在各种操作条件下，在具有小规模Venturi型部分的近距离环绕隧道中研究了温度对液压空化动力学的影响。使用高速可视化系统在24°C和85°C之间变化的温度来进行系统研究，以观察空化流动。本文提供的图像处理方法存在对空化动力学和结构发展的定量比较。结果表明，流体温度的增加诱导空化体积的生长至约55℃，此后温度的额外增加具有相反的效果。这种演变被解释为雷诺效应与众所周知的热效应之间的竞争。在温度范围内更紧密地研究了40°C - 65°C的空化，以分析结构和空化动力学的变化。为了预测热抑制头，可以经验使用的热效应参数σ在最大空化长度下得出。该流体热动力学参数σ（T_（Trans））可以参考，以避免最大的空化侵蚀性诱导振动或侵蚀热转变温度的热水液。最后，提出和分析了影响空化长度和脱落频率的因素。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第5期|120970.1-120970.12|共12页
  • 作者

    Mingming Ge; Martin Petkovsek; Guangjian Zhang; Drew Jacobs; Olivier Coutier-Delgosha;

  • 作者单位

    Kevin T. Crofton Department of Aerospace and Ocean Engineering Virginia Tech Blacksburg VA 24060 USA;

    Laboratory for Water and Turbine Machines Faculty of Mechanical Engineering University of Ljubljana Askerceva 6 Ljubljana WOO Slovenia;

    Univ. Lille CNRS ONERA Arts et Metiers ParisTech Centrale Lille FRE 2017 - LMFL - Laboratoire de Mecanique des fluides de Lille - Kampe de Feriet Lille F-59000 France;

    Kevin T. Crofton Department of Aerospace and Ocean Engineering Virginia Tech Blacksburg VA 24060 USA;

    Kevin T. Crofton Department of Aerospace and Ocean Engineering Virginia Tech Blacksburg VA 24060 USA Univ. Lille CNRS ONERA Arts et Metiers ParisTech Centrale Lille FRE 2017 - LMFL - Laboratoire de Mecanique des fluides de Lille - Kampe de Feriet Lille F-59000 France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hydrodynamic cavitation; Venturi-type constriction; Cavitation dynamics; Thermodynamic effects; Hot water;

    机译：流体动力空化;文丘里型收缩;空化动力学;热力学效应;热水;

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