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首页> 外文期刊>International Journal of Heat and Mass Transfer >Longitudinal distributions of CO concentration and difference with temperature field in a tunnel fire smoke flow
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Longitudinal distributions of CO concentration and difference with temperature field in a tunnel fire smoke flow

机译：隧道火灾烟气中CO浓度的纵向分布及其与温度场的关系。

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摘要

Longitudinal decay profiles of CO concentration and smoke temperature in a tunnel fire smoke flow are theoretical analyzed and compared, with their difference investigated, under different longitudinal ventilation velocities. Experimental data on longitudinal CO distribution achieved from a set of full scale road tunnel fire tests are presented to compare with the theoretical equation. CFD simulations are also carried out by Fire Dynamics Simulator (FDS). It is found that the longitudinal profile of CO concentration along the tunnel yields a function of C_x/C_0 = 1/(1 + bx), and its difference with that of the smoke temperature increases along the tunnel by a function of C_x/C_0 - △T_x/△T_0 ≈ λ(1 - e~(-kx)). The smoke temperature decays much faster than the CO concentration along the tunnel. Their longitudinal profile difference decreases as the longitudinal ventilation velocity increases, and increases along with the distance away from the fire asymptotically to a quasi-steady value. The value of b decreases as the longitudinal ventilation velocity increases, which indicates that the CO concentration decays relatively slower along the tunnel under a higher longitudinal ventilation velocity. And its value is shown to be less affected by the longitudinal ventilation velocity for a relative larger fire. The increase in the longitudinal ventilation velocity leads to the enhancement of the air mass entrainment, thus results in the decrease of the longitudinal decay profile difference between the CO concentration and the smoke temperature. The value of λ is found to decrease with the increase of the longitudinal ventilation velocity, following a reciprocal function of λ ～ 1(φ + αu). Its value at zero longitudinal ventilation velocity is higher for a larger fire, but decreases faster with the increase of the longitudinal ventilation velocity than a smaller fire. The full scale experimental data and the CFD simulation results both agree well with the theoretical analysis and equations.
机译：理论分析和比较了不同纵向通风速度下隧道火灾烟气中CO浓度和烟气温度的纵向衰减曲线，并进行了比较。提出了通过一组全面的公路隧道火灾测试获得的纵向CO分布的实验数据，以与理论方程进行比较。 CFD模拟也由Fire Dynamics Simulator（FDS）进行。发现沿隧道的CO浓度的纵向分布产生C_x / C_0 = 1 /（1 + bx）的函数，并且它与沿隧道的烟气温度的差异通过C_x / C_0-的函数增加。 △T_x /△T_0≈λ（1-e〜（-kx））。烟气的温度下降速度远快于沿隧道的CO浓度。它们的纵向轮廓差随着纵向通风速度的增加而减小，并且随着远离火的距离渐近地增加到准稳态值。 b的值随纵向通风速度的增加而减小，这表明在较高的纵向通风速度下，CO浓度沿隧道的衰减相对较慢。对于相对较大的火灾，其值受纵向通风速度的影响较小。纵向通风速度的增加导致空气质量夹带的增强，因此导致CO浓度和烟气温度之间的纵向衰减曲线差异减小。发现λ的值随纵向通风速度的增加而减小，服从λ〜1（φ+αu）的倒数函数。对于较大的火灾，其在零纵向通风速度处的值较高，但与较小的火灾相比，其随着纵向通风速度的增加而减小得更快。完整的实验数据和CFD仿真结果都与理论分析和方程式非常吻合。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2010年第14期|2844-2855|共12页
  • 作者

    L.H. Hu; F. Tang; D. Yang; S. Liu; R. Huo;

  • 作者单位

    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;

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

    tunnel fire; smoke temperature; carbon monoxide concentration; longitudinal profile; longitudinal ventilation;

    机译：隧道火灾;烟雾温度;一氧化碳浓度纵向轮廓纵向通气;

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