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Natural circulation two-phase flow characteristics in a rod bundle channel under stable and rolling motion conditions

机译：稳定和滚动运动条件下杆束通道中的自然循环两相流动特性

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摘要

Natural circulation two-phase flow characteristics are studied under stable and rolling motion conditions in a rod bundle channel. The mass quality, flow rate and frictional pressure drop variation results with increasing heat flux are given and the effects of system pressure and inlet subcooling are analyzed. The flow rate decline is observed under high mass quality conditions since the frictional pressure drop is large.enough. The flow instability characteristics for different stages with increasing heat flux are given. The main reason for the flow instability characteristics variation is that the dominant factor changes from subcooled boiling to the pressure drop oscillation. The experimental results indicate that increasing the system pressure and the inlet resistance of the test section, including moving the compressible volume to a downstream position, can delay the onset of the flow instability. The time-average flow parameters under rolling motion conditions are mainly influenced by the stable mass quality and the rolling parameters. For high stable mass quality conditions, the time-average two-phase flow parameters decrease a little compared to stable results. With the stable mass quality decreasing, the time-average mass quality gradually increases with the rolling frequency. For further lower stable mass quality conditions, the time-average values are even larger than stable values. For the frictional resistance calculation, a few correlations are evaluated and recommended. Additionally, new correlations are fitted for stable and time-average two-phase frictional pressure drop prediction in high mass quality conditions. (C) 2019 Elsevier Ltd. All rights reserved.
机译：研究了杆束通道在稳定和滚动运动条件下的自然循环两相流动特性。给出了质量，流量和摩擦压降随热通量增加而变化的结果，并分析了系统压力和入口过冷的影响。由于摩擦压降足够大，因此在高质量条件下可观察到流量下降。给出了随着热通量的增加，不同阶段的流动失稳特性。流动不稳定特性变化的主要原因是，主导因素从过冷沸腾变为压降振荡。实验结果表明，增加系统压力和测试部分的入口阻力，包括将可压缩体积移动到下游位置，都可以延迟流动不稳定的发生。滚动运动条件下的时间平均流量参数主要受稳定质量和滚动参数的影响。对于高质量的稳定质量条件，与稳定结果相比，时间平均两相流参数略有下降。随着稳定质量的下降，时均质量随着轧制频率的增加而逐渐增加。对于更低的稳定质量质量条件，时间平均值甚至比稳定值还要大。为了计算摩擦阻力，需要评估并建议一些相关性。此外，新的相关性适用于在高质量条件下进行稳定且时间平均的两相摩擦压降预测。 （C）2019 Elsevier Ltd.保留所有权利。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2019年第10期|517-529|共13页
  • 作者

    Zhu Zhiqiang; Ren Tingting; Liu Yiwen; Yan Changqi; Wan Jianjun;

  • 作者单位

    Harbin Engn Univ, Fundamental Sci Nucl Safety & Simulat Technol Lab, Harbin 150001, Heilongjiang, Peoples R China|Wuhan 2nd Ship Design & Res Inst, Wuhan 430060, Hubei, Peoples R China;

    Harbin Engn Univ, Fundamental Sci Nucl Safety & Simulat Technol Lab, Harbin 150001, Heilongjiang, Peoples R China;

    Wuhan 2nd Ship Design & Res Inst, Wuhan 430060, Hubei, Peoples R China;

    Harbin Engn Univ, Fundamental Sci Nucl Safety & Simulat Technol Lab, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Engn Univ, Fundamental Sci Nucl Safety & Simulat Technol Lab, Harbin 150001, Heilongjiang, Peoples R 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

    Rod bundle; Natural circulation; Two-phase flow; Flow instability; Rolling motion;

    机译：杆束;天然循环;两相流动;流动不稳定;滚动运动;

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