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首页> 外文期刊>International Journal of Heat and Mass Transfer >Behavior of an air-cooled thermosiphon during a non-air gas ingress event
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Behavior of an air-cooled thermosiphon during a non-air gas ingress event

机译：在非空气气体入口事件期间风冷热虹吸的行为

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摘要

This study investigates the transient response of an air-cooled thermosiphon subjected to a sudden non-air gas ingress event. Results presented are from experimental testing conducted on a large-scale thermal hydraulic facility that examines heat removal performance of the Reactor Cavity Cooling System (RCCS) concept, a passive safety system for advanced nuclear reactors. Relying on buoyancy driven natural circulation flow, these systems feature a series of riser standpipes and coupled chimney network that provide a pathway for heat rejection to the atmosphere. In this work, the facility was modified to allow a transition of the draft intake from normal ambient air, to draft intake from an open-top volume containing high purity argon. Testing began by establishing normal operation and allowing the facility to reach steady-state thermal hydraulic flow conditions with natural air draft. The transitioned sequence was then initiated which simultaneously changed the inlet boundary from open air to a pathway from the quiescent argon volume. This event caused 1,200 cu-feet of the heavy gas, twice the internal volume of total facility flow path, to be drawn into the inlet plenum and ingress into the heated riser standpipes. With the upper chimney network still containing residual air, there was insufficient density difference to maintain buoyancy driven natural circulation. After a period of only 90 s past the ingress event, the facility experienced complete flow stagnation before entering an extended period of severely degraded system flow. Due to the cessation of bulk fluid movement and subsequent failure of its heat removal function, fluid and structural temperatures began to rise sharply. Re-circulation patterns developed within the multiple parallel riser standpipes, where hot gas near the outlets was observed to travel downward and re-enter the inlet of adjacent channels. After approximately 18-minutes, fluid temperatures and their associated density difference rose to a level sufficient to allow reestablishment of buoyancy driven system flow, and ultimately, recovery of facility operation to normal behavior.
机译：本研究调查了对突然的非气体进入事件进行的风冷热虹吸件的瞬态响应。所提出的结果来自在大型热液压设施上进行的实验测试，该设施检测反应器腔冷却系统（RCC）概念的散热性能，是先进核反应堆的被动安全系统。这些系统依靠浮力驱动的自然循环流程，这些系统具有一系列立管立管和耦合的烟囱网络，可提供对大气中的热量排斥的途径。在这项工作中，修改了该设施，以允许从正常环境空气中转换到正常环境空气中，从含有高纯度氩气的开放式体积中出口摄入量。通过建立正常操作开始测试，并允许设施达到具有自然空气牵伸的稳态热液压流量。然后启动过渡序列，其同时将入口边界与静态氩卷的透露空气改变为途径。这一事件引起了1,200英尺的重气体，总设施流动路径的内部体积的两倍，被吸入入口增压室和进入加热的提升管立管。利用上烟囱网络仍然含有残留空气，密度差异不足，以保持浮力驱动的自然循环。经过一段时间仅在进入事件的情况下，该设施在进入严重降级的系统流程的延长时期之前经历了完全的流动停滞。由于散装流体运动的停止和随后的散热功能失效，流体和结构温度开始急剧上升。在多个平行提升管安装件内开发的再循环模式，观察到出口附近的热气以向下行进并重新进入相​​邻通道的入口。在大约18分钟后，流体温度及其相关的密度差异升至足以允许重建浮力驱动系统流动的水平，并最终恢复设施运行到正常行为。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121155.1-121155.10|共10页
  • 作者

    Darius Lisowski; Adam Kraus; Qiuping Lv; Rui Hu;

  • 作者单位

    Argonne National Laboratory Nuclear Science & Engineering Division 9700 S Cass Ave. Lemont IL 60439 United States;

    Argonne National Laboratory Nuclear Science & Engineering Division 9700 S Cass Ave. Lemont IL 60439 United States;

    Argonne National Laboratory Nuclear Science & Engineering Division 9700 S Cass Ave. Lemont IL 60439 United States;

    Argonne National Laboratory Nuclear Science & Engineering Division 9700 S Cass Ave. Lemont IL 60439 United States;

  • 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

    Natural circulation; Thermosiphon; Cas ingress; Passive safety;

    机译：自然循环;Thermiphon;CAS Ingress;被动安全;

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