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Comparative study on carbon monoxide stratification and thermal stratification in a horizontal channel fire

机译：水平通道火灾中一氧化碳分层与热分层的比较研究

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摘要

Carbon monoxide (CO) stratification and its relationship with thermal stratification are quite important for dealing with issues related to building fire safety. This experimental study compares the CO stratification and thermal stratification in channel fires. The results show that the relationship between CO stratification and thermal stratification depends on heat loss intensity from smoke flow to walls. In the conditions with considerable amount of heat loss, the vertical gradients of CO volume concentration are smaller than those of temperature rise beneath the ceiling. However, in the conditions with negligible heat loss, the vertical profile of dimensionless CO volume concentration becomes similar with dimen-sionless temperature rise. The longitudinal ventilation, as a prevailing smoke control or ventilation method, has a strong effect on the relationship between CO stratification and thermal stratification. A larger longitudinal air flow velocity leads to smaller heat loss intensity from smoke flow to walls and thus a higher similarity between CO stratification and thermal stratification.
机译：一氧化碳（CO）分层及其与热分层的关系对于处理与建筑物消防安全有关的问题非常重要。这项实验研究比较了通道火灾中的CO分层和热分层。结果表明，CO分层和热分层之间的关系取决于从烟流到墙壁的热损失强度。在有大量热量损失的条件下，CO体积浓度的垂直梯度小于天花板下温度上升的垂直梯度。但是，在热量损失可忽略的条件下，无量纲CO体积浓度的垂直分布与无量纲温升相似。纵向通风作为一种流行的烟气控制或通风方法，对CO分层和热分层之间的关系有很大影响。较大的纵向空气流速导致从烟流到壁的热损失强度较小，因此CO分层和热分层之间的相似度更高。

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  • 来源
    《Building and Environment》 |2012年第3期|p.1-8|共8页
  • 作者

    D. Yang; R. Huo; X.L Zhang; S. Zhu; X.Y. Zhao;

  • 作者单位

    Faculty of Urban Construction and Environmental Engineering, Chongqing University. Chongqing 400045, China;

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, China;

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, China;

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, China;

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    channel fire; carbon monoxide stratification; thermal stratification; longitudinal ventilation; heat loss;

    机译：通道火一氧化碳分层热分层纵向通风;热损失;

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