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首页> 外文会议>Proceedings of the fire and materials 2015 conference >AN EXERCISE IN OBTAINING FLAME RADIATION FRACTION FROM THE CONE CALORIMETER
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AN EXERCISE IN OBTAINING FLAME RADIATION FRACTION FROM THE CONE CALORIMETER

机译：从锥形量热仪获得火焰辐射分数的运动

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摘要

The radiant fraction of the heat of combustion emitted by flames of burning fuels is anrnimportant quantity needed to predict the thermal radiation from pool fires to remote targets, and as arnlocal flame parameter in CFD models. Although there is data for radiant fraction of gas flames, therernis little data for this parameter for burning solid materials. The sole source of these data is ArchiernTewarson, who used the FMGlobal Fire Propagation Apparatus (FPA) to compute the radiant fractionrnof the heat of combustion from energy losses associated with enthalpy flow and duct heat losses. Thisrnpaper describes a similar approach to obtain the radiant fraction of the heat from flames of burningrnsolids using the cone calorimeter. In the present work, the cone calorimeter is calibrated using arnMeeker burner with a premixed methane/air flame that is small, blue and has minimum flamernradiation. A heat loss correction factor due to thermal conductance from the duct to the ambientrnair is determined from the calibration by measuring the temperature of the combustion stream in thernduct at the gas sampling location. That factor was found to be 13 +/- 2 W/K by calibration comparedrnto a theoretical estimate of 9.3 W/K. The effect of the heat capacity of the duct walls is accounted forrnby de-convoluting the duct temperature history. The necessary measurements to compute the radiantrnfraction then become: the heat release rate by oxygen consumption, the mass flow rate in the duct, andrnthe gas temperature in the duct at the sampling location. Results were obtained for 15 polymers, 8 ofrnwhich could be compared to data for nominally similar materials obtained by Tewarson. In addition,rnresults are found to be in good agreement with a correlation by Tewarson in terms of combustionrnefficiency.
机译：燃烧燃料的火焰散发出的燃烧热的辐射分数是预测从池火到远程目标的热辐射所需的重要量，在CFD模型中作为局部火焰参数。尽管有关于气体火焰辐射分数的数据，但是关于燃烧固体材料的该参数的数据很少。这些数据的唯一来源是ArchiernTewarson，他使用FMGlobal消防设备（FPA）计算了与焓流和管道热损失相关的能量损失所产生的燃烧热的辐射分数。本文介绍了一种类似的方法，使用锥形量热仪从燃烧的固体火焰中获取热量的辐射分数。在当前工作中，使用arnMeeker燃烧器校准了锥形量热仪，该燃烧器具有甲烷，空气的预混合气体，该气体小，蓝色且火焰辐射最小。通过测量气体采样位置的管道中燃烧流的温度，通过校准确定由于从管道到周围空气的热导率引起的热损失校正因子。通过校准发现该因子为13 +/- 2 W / K，而理论估计值为9.3 W / K。通过对管道温度历史进行反卷积，可以解决管道壁热容量的影响。然后，计算辐射分数的必要测量变为：耗氧量释放的热量，管道中的质量流速以及采样位置处管道中的气体温度。获得了15种聚合物的结果，其中8种可以与Tewarson获得的名义上相似的材料的数据进行比较。此外，结果发现Tewarson在燃烧效率方面与相关性很好。

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  • 来源
  • 会议地点 San Francisco CA(US)
  • 作者

    J. G. Quintiere; R. Lyon; S. Crowley;

  • 作者单位

    Dept. of Fire Protection Engineering, University of Maryland, CP, USA.;

    Fire Safety Branch, FAA Technical Center, Atlantic City, NJ, USA;

    Fire Safety Branch, FAA Technical Center, Atlantic City, NJ, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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