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首页> 外文期刊>Journal of engineering thermophysics >Turbulent Structure of Cavitating Flow: PIV Measurements over a Model of Guide Vane of Hydraulic Turbine
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Turbulent Structure of Cavitating Flow: PIV Measurements over a Model of Guide Vane of Hydraulic Turbine

机译：空化流动湍流结构：液压涡轮机导向叶片模型的PIV测量

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摘要

The article presents the results of an experimental study of the turbulent structure of flow over a two-dimensional hydrofoil, which is a scaled-down model of guide vane of high-pressure hydraulic turbine. The study was carried out for four regimes of cavitating flow, covering the cases of cavitation-free flow, quasi-steady sheet-vortex cavity with detachments of small-scale cavitation clouds, and unsteady cloud cavitation with periodic separation of the whole attached cavity, formation of large-scale cavitation cloud, and its advection. Distributions of the average velocity, turbulent kinetic energy, and functional shear stresses are given. The transformation of the turbulent structure of the flow over the hydrofoil during transition from the cavitation-free flow to the regime of cloud cavitation is analyzed. Flow regions with non-local characteristics of turbulent transport are detected, where the known semi-empirical gradient-type models used in RANS approaches give qualitatively improper results.
机译：本文介绍了高压水轮机导叶缩比模型二维水翼绕流紊流结构的实验研究结果。对空化流的四种状态进行了研究，包括空化自由流、小尺度空化云分离的准稳态片涡空化和整个附腔周期性分离的非定常云空化、大尺度空化云的形成及其平流。给出了平均速度、湍动能和函数剪应力的分布。分析了水翼从空化自由流过渡到云空化状态时的湍流结构变化。检测到具有湍流传输非局部特征的流动区域，其中RANS方法中使用的已知半经验梯度型模型给出了定性不正确的结果。

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    Timoshevskiy M. V.; Ilyushin B. B.; Pervunin K. S.;

  • 作者单位

    Russian Acad Sci Siberian Branch Kutateladze Inst Thermophys Pr Akad Lavrenteva 1 Novosibirsk 630090 Russia;

    Russian Acad Sci Siberian Branch Kutateladze Inst Thermophys Pr Akad Lavrenteva 1 Novosibirsk 630090 Russia;

    Russian Acad Sci Siberian Branch Kutateladze Inst Thermophys Pr Akad Lavrenteva 1 Novosibirsk 630090 Russia;

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  • 正文语种 eng
  • 中图分类 热力工程、热机;
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