• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Predicting the fire spread rate of a sloped pine needle board utilizing pyrolysis modelling with detailed gas-phase combustion
【24h】

Predicting the fire spread rate of a sloped pine needle board utilizing pyrolysis modelling with detailed gas-phase combustion

机译：利用热解模型和详细的气相燃烧预测倾斜的松针板的火势蔓延率

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A novel Large Eddy Simulation (LES) based fire field model that incorporates pyrolysis modelling has been developed. This model is specifically designed for flame propagation of wildland fire scenarios. It uniquely embraces the radiation heat feedback from the flame, gaseous combustion and soot products towards the fuel bed surface. It also considers the detailed chemical kinetics for combustion, primary soot incipient and oxidant for soot formation, turbulent microscopic fuel–air mixing which are fully coupled, interactive and non-linear. Numerical simulation has been performed to study the effect of slope angle on the flame propagation characteristic of pine needle fuel beds. The fire spread rate and temperature predictions are within 12% accuracy in comparison to experimental data. Owing to the unbalanced air entrainment drew by the flame combustion for the inclined slope angle cases, it can be observed from the visualised flame that it was tilted to the unburned portion of the board. This behaviour strongly promotes the radiative heat transfer from the flame onto the fuel bed, which led to a rapid increase in pyrolysis rate thus accelerated the overall flame spread on the board surface. This physical phenomenon was successfully captured by the pyrolysis model and was found to be significantly more accurate in predicting the fire spread rate for slope angles higher than 20° (error of 11.12%) when compared to empirical flame tracking methods (error of 87.19%).
机译：一种新型的基于大涡模拟（LES）的火场模型已纳入热解模型。该模型是专门为野外火灾场景的火焰传播而设计的。它独特地包含了从火焰，气体燃烧和烟尘产物向燃料床表面的辐射热反馈。它还考虑了详细的燃烧化学动力学，烟灰初生和烟灰形成的氧化剂，湍流的微观燃料-空气混合，它们是完全耦合，相互作用且非线性的。进行了数值模拟，以研究倾斜角对松针燃料床火焰传播特性的影响。与实验数据相比，火势蔓延率和温度预测的准确性在12％以内。由于在倾斜的倾斜角度情况下，火焰燃烧导致空气夹带不平衡，因此从可视化火焰中可以看出，空气倾斜到了板子的未燃烧部分。这种行为强烈地促进了从火焰到燃料床的辐射热传递，这导致了热解速率的迅速提高，从而加速了整个火焰在板表面的扩散。通过热解模型成功捕获了该物理现象，并且与经验火焰跟踪方法（误差为87.19％）相比，在预测倾斜角大于20°（误差为11.12％）的火势蔓延率时，发现该现象更为精确。 。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第10期|310-322|共13页
  • 作者

    T.B.Y. Chen; A.C.Y. Yuen; C. Wang; G.H. Yeoh; V. Timchenko; S.C.P. Cheung; Q.N. Chan; W. Yang;

  • 作者单位

    School of Mechanical and Manufacturing Engineering, University of New South Wales;

    School of Mechanical and Manufacturing Engineering, University of New South Wales;

    School of Mechanical and Manufacturing Engineering, University of New South Wales;

    School of Mechanical and Manufacturing Engineering, University of New South Wales,Australian Nuclear Science and Technology Organisation (ANSTO);

    School of Mechanical and Manufacturing Engineering, University of New South Wales;

    School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University;

    School of Mechanical and Manufacturing Engineering, University of New South Wales;

    School of Mechanical and Manufacturing Engineering, University of New South Wales,Department of Chemical and Materials Engineering, Hefei University;

  • 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

    Fire spread; Pyrolysis; Detailed chemistry; Large eddy simulation; Soot modelling;

    机译：火势蔓延;热解;详细化学;大涡模拟;烟灰模拟;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号