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Frequency characteristics of liquid hydrogen cavitating flow over a NACA0015 hydrofoil

机译：NACA0015水翼液氢气空液流量的频率特性

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摘要

Large eddy simulation on unsteady cavitating flow of liquid hydrogen over a three-dimensional NACA0015 hydrofoil with the attack angle (alpha) of 6 degrees are carried out to investigate the dynamic features of cavity with the existence of thermal effects. The numerical model considers the compressibility of both liquid and vapor phase, and is validated by comparing the results with the available experimental data. Special emphasis is put on analyzing the frequency characteristics of cavitation cloud. Strouhal number (St) is plotted against sigma/2 alpha (sigma is cavitation number), and the water cavitation data reported by Andrt et al. are also used as a reference. It is found that the St number for LH2 cavitation is much smaller than the water, in which the thermal effects are generally not considered, at the same sigma/2 alpha value when it is greater than about 2.0, while it returns to the same level as water when sigma/2 alpha decreases to below 2.0. The reason is primarily ascribed to the thermal effects, and the detailed explanations are given based on the recognitions that the shedding mechanism of cavitation clouds is predominated by the combined action of the vortex flow and thermal effects. While, when sigma/2 alpha decreases to a critical value, the relative effect of the thermal effects on the cavitation dynamics is greatly weakened compared with the mechanism due to the vortex flow, like those in isothermal cavitation flow in traditional fluids. The results provide a deeper understanding of the cryogenic fluid cavitation flow.
机译：进行大型涡流模拟在具有6度的攻击角度（α）的三维NaCa0015水翼上的不稳定空化氢气流量，以研究腔的动态特征，以存在热效应。数值模型考虑了液体和气相的可压缩性，并通过将结果与可用的实验数据进行比较来验证。特别强调分析空化云的频率特性。斯特鲁姆数（ST）绘制针对Sigma / 2α（Sigma是空化数），以及Andrt等人报告的水空化数据。也用作参考。发现LH2空化的ST编号远小于水，其中通常不考虑热效应，当它大于约2.0时，通常不考虑热效应，而返回相同的级别当Sigma / 2 alpha减少到2.0以下时作为水。原因主要归因于热效应，基于识别的识别方法通过涡流流动和热效应的组合作用占主导地位的缩小机制来给出详细说明。虽然当Sigma / 2 alpha减少到临界值时，与由于涡流导致的机制相比，热效应对空化动力学的相对效果大大削弱，与传统流体中的等温空化流动一样。结果提供了对低温流体空化流动的更深入了解。

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  • 来源
    《Cryogenics》 |2018年第2018期|共13页
  • 作者

    Zhu Jiakai; Wang Shunhao; Qiu Limin; Zhi Xiaoqin; Zhang Xiaobin;

  • 作者单位

    Zhejiang Univ Inst Refrigerat &

    Cryogen Key Lab Refrigerat &

    Cryogen Technol Zhejiang Pro Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Inst Refrigerat &

    Cryogen Key Lab Refrigerat &

    Cryogen Technol Zhejiang Pro Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Inst Refrigerat &

    Cryogen Key Lab Refrigerat &

    Cryogen Technol Zhejiang Pro Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Inst Refrigerat &

    Cryogen Key Lab Refrigerat &

    Cryogen Technol Zhejiang Pro Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Inst Refrigerat &

    Cryogen Key Lab Refrigerat &

    Cryogen Technol Zhejiang Pro Hangzhou 310027 Zhejiang Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 制冷工程;低温物理学;
  • 关键词

    Cavitation; Liquid hydrogen; Hydrofoil; Frequency; Thermal effects;

    机译：空化;液态氢;水翼;频率;热效应;

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