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Influences of specimen size and heating mode on the ignitability of polymeric materials in typical small-scale fire test conditions

机译：在典型的小规模火灾测试条件下，试样尺寸和加热方式对聚合材料可燃性的影响

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摘要

Small-scale fire tests including the Underwriters Laboratories 94 (UL94) vertical burning test and the cone calorimeter test are widely used. In this paper, the ignition times of materials heated by the conical heater of a cone calorimeter and the UL94 flame were measured. It was found that for polymer bars heated by the UL94 flame, the ignition time is relatively short and increases with the specimen thickness. But the contribution of the specimen thickness to the delay of the ignition time is limited. The intrinsic properties of materials play a more important role in the ignition time than the specimen thickness. In addition, respectively corresponding to one-dimensional, two-dimensional, and three-dimensional heat transfer, three heating modes of the UL94 flame were presented and compared with the conical heater. It was found that whether the heat source is the conical heater or the UL94 flame, the ignition time depends on the heat flux and the multidimensional heat transfer. The ignition time decreases with the increasing heat flux, and the magnitude order of the ignition time might drop when the heating mode changes from one-dimensional to multidimensional heat transfer.
机译：包括Underwriters Laboratories 94（UL94）垂直燃烧测试和锥形量热仪测试在内的小规模火灾测试已被广泛使用。在本文中，测量了由锥形量热仪的锥形加热器和UL94火焰加热的材料的着火时间。已发现，对于通过UL94火焰加热的聚合物棒，着火时间相对较短，并随样品厚度的增加而增加。但是样品厚度对点火时间延迟的贡献是有限的。材料的固有特性在点火时间中比样品厚度更重要。此外，分别对应于一维，二维和三维传热，提出了UL94火焰的三种加热模式，并与锥形加热器进行了比较。发现热源是锥形加热器还是UL94火焰，点火时间取决于热通量和多维传热。点火时间随热通量的增加而减小，并且当加热模式从一维传热变为多维传热时，点火时间的量级可能会下降。

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  • 来源
    《Fire and materials》 |2012年第3期|p.231-240|共10页
  • 作者

    Yong Wang; Jun Zhang;

  • 作者单位

    Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics,Qingdao University of Science & Technology, 53 Zhengzhou Road, Qingdao 266042, China,College of Environment and Safety Engineering, Qingdao University of Science & Technology, 53 Zhengzhou Road,Qingdao 266042, China;

    Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics,Qingdao University of Science & Technology, 53 Zhengzhou Road, Qingdao 266042, China,College of Environment and Safety Engineering, Qingdao University of Science & Technology, 53 Zhengzhou Road,Qingdao 266042, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    UL94; vertical burning; cone calorimeter; ignition; specimen thickness; multidimensional heat transfer;

    机译：UL94;垂直燃烧锥形量热仪点火;试样厚度多维传热;

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