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Numerical Analysis of the energy loss mechanism in cavitation flow of a control valve

机译：控制阀空化流动流量的数值分析

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摘要

Cavitation can cause considerable damage within control valves and nearby pipelines. Despite the extensive research, the mechanism of energy loss in cavitation flow of control valves is not yet adequately understood. In this study, the mechanism of mechanical energy transfer and loss in unsteady cavitation flow and the effect of cavitation on energy loss of a control valve with different pressure ratio conditions were numerically investigated by the validated numerical method based on the LES model. A dimension-less parameter called flow energy gradient was proposed to evaluate the rate of energy loss. Results show that the contribution of the energy loss is much greater in the region of valve seat throat where strong throttling and severe cavitation occur. The total energy loss in the control valve is composed by the throttling loss and the additional energy loss of cavitation, the latter leads to an increase in flow resistance and a decrease in flow capacity of the control valve. Moreover, the additional energy loss induced by cavitation increases with the severity of cavitation, which may result from the change of the liquid-vapor phase.
机译：空化会在控制阀和附近管道内引起相当大的损坏。尽管研究了广泛的研究，但对控制阀的空化流量的能量损失机制尚未得到充分的理解。在该研究中，通过基于LES模型的验证的数值方法，数值研究了基于LES模型的验证的数值方法对机械能传递和不稳定空化流体的损失和空化对控制阀能量损失的影响。提出了一种称为流量梯度的尺寸的参数，以评估能量损失率。结果表明，在阀座喉部的区域中，能量损失的贡献要大得多，其中发生强大的节流和严重空化。控制阀的总能量损失由节流损耗和空化的额外能量损失构成，后者导致流动阻力的增加和控制阀的流量减小。此外，空化引起的额外能量损失随着空化的严重程度而增加，这可能是由液相液相的变化导致的。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121331.1-121331.9|共9页
  • 作者

    Xiaogang Xu; Liang Fang; Anjun Li; Zhenbo Wang; Shuxun Li;

  • 作者单位

    College of New Energy China University of Petroleum (East China) Qjngdao 266580 China College of Petrochemical Technology Lanzhou University of Technology Lanzhou 730050 China;

    College of New Energy China University of Petroleum (East China) Qjngdao 266580 China Weihai Ocean Vocational College Weihai 264300 China;

    College of New Energy China University of Petroleum (East China) Qjngdao 266580 China;

    College of New Energy China University of Petroleum (East China) Qjngdao 266580 China;

    College of Petrochemical Technology Lanzhou University of Technology Lanzhou 730050 China;

  • 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

    Cavitation; Energy loss; Energy transfer; Control valve; Cavity; LES;

    机译：空化;能量损失;能量转移;控制阀;腔;l;

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