| 朱中华,刘宪德.火焰沿层状疏松燃料的定常蔓延[J].火灾科学,1995,4(1):1-11. |
| 火焰沿层状疏松燃料的定常蔓延 |
| STEADY SPreading of a Flame Through Laminal Porous Fuel |
| 投稿时间：2010-11-23 修订日期：2010-12-21 |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| DOI：10.3969/j.issn.1004-5309.年.期.顺序 |
| 基金项目:国家林火研究与开发基金资助 |
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| 中文关键词: 火蔓延 热传递 疏松燃料 物理模型 |
| 英文关键词:flame spread heat transfer poroub fuel physical model |
| 摘要点击次数: 716 |
| 全文下载次数: 1105 |
| 中文摘要: |
| 本文从燃料预热角度出发，建立了一个无风状态下火焰沿层状疏松燃料水平定常蔓延的物理模型。在该模型中，假设环境无风，从热学角度考虑燃料很薄。燃料加热机制包括火焰辐射，燃料中的热辐射和热传导以及火焰通过扩散对流对其附近燃料的加热，散热机制包括燃料上表面辐射散热和对流散热。计算得到了火焰蔓延速度同几个主要影响因素之间的关系，并用曲线拟合技术得到了一个简单的函数表达式。该模型用实验进行了检验，由于对燃料中的热辐射采用了辐射向量的处理方法，同时，考虑了火焰卷吸引起的强迫对流对散热的影响，从而伎计算结果同实验取得了较好的一致。 |
| 英文摘要: |
| Aphysical model is proposed from the point of view of fuel preheating to describethe horizontally steady bpreading of a flame through laminal porous fuel.It is absumedthat there is no ambient wind,the fuel layer is thermally thin,The mechanisms of heat-ing contain the radiation from the flame,the radiation and the conduction through thefuel layer, and the diffubion,convection of the flame. The cooling mechanisms includ-ing radiative cooling from the upper surface of fuel layer and convective cooling inducedby the flame are also considered,The relationships between the rate of spread and themajor influential factors are given by numerical computation. Using curve fitting tech-nique with computational data,a 5lmple formula for the rate of spread is obtained. Themodel i5, tested against laboratory experiments. Due to the adoption of radiation vectorto treat the radiation through fuel layer and the con5ideration of the foreced convectioninduced by the flame,the computational results get in essential agreement with the ex-periments. |
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