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An experimental investigation of flow boiling instability in a natural circulation loop

机译：自然循环中流动沸腾不稳定性的实验研究

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摘要

An experimental investigation of flow boiling instability in a single macro-channel natural circulation loop at high inlet subcooling and low pressure is performed. Flow boiling instabilities without and with flow reversal which are classified as pressure drop oscillations are observed. The characteristics of flow reversal in a single macro-channel are illustrated. Flow reversal is verified on the basis of three evidences: negative inlet flowrate, inlet water temperature pulse and large amplitude pressure oscillations in the compressible volume. The mechanism of flow reversal is given by correlating experimental heat fluxes with CHFs predicted by Umekawa correlation and Zhao correlation. It can be concluded that flow instability induces the premature of CHF. Flow reversal is caused by the onset of CHF and accompanied by periodic dryout and rewetting. Flow regime in the heated channel is depicted based on the exit water temperature oscillations, heating surface temperature profile and periodic dryout. A comparison has been made for the mechanism of flow reversal between macro-channel and micro/mini-channel. Three prerequisites contribute to the occurrence of flow reversal in a macro-channel: (1) low pressure natural circulation, (2) long two-phase region and (3) upstream compressible volume. Lastly, a stability map which distinguishes the boundaries of flow instabilities without and with flow reversal is given.
机译：在高入口过冷和低压下，对单个大通道自然循环回路中的流沸腾不稳定性进行了实验研究。观察到没有和具有反向流动的沸腾不稳定性，它们被归类为压降振荡。说明了单个宏通道中的逆流特性。流动的逆转基于以下三个证据进行验证：负入口流量，入口水温脉冲和可压缩容积中的大振幅压力振荡。通过将实验热通量与梅川相关性和赵相关性预测的CHFs相关联，给出了逆流机理。可以得出结论，流动不稳定性会导致CHF的过早发生。流量逆转是由CHF的发作引起的，并伴有定期变干和重新润湿。基于出口水温振荡，受热面温度曲线和定期变干来描述加热通道中的流动状态。已经对宏通道和微型/微型通道之间的逆流机理进行了比较。在大通道中发生逆流的三个先决条件是：（1）低压自然循环，（2）长的两相区域和（3）上游可压缩体积。最后，给出了一个稳定性图，该图可区分有无流动和有流动反向的流动不稳定性的边界。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第2期|1125-1134|共10页
  • 作者

    Xianbing Chen; Puzhen Gao; Sichao Tan; Zhiting Yu; Chong Chen;

  • 作者单位

    Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Heilongjiang 150001, PR China;

    Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Heilongjiang 150001, PR China;

    Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Heilongjiang 150001, PR China;

    Wuhan Second Ship Design and Research Institute, Wuhan 430205, PR China;

    China Ship Development and Design Center. Wuhan 430064, PR 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

    Flow boiling instability; Natural circulation; Macro-channel; Pressure drop oscillations; Flow reversal;

    机译：流沸腾不稳定性;自然循环;宏通道;压降振荡;逆流;

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