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首页> 外文期刊>Combustion and Flame >Emulation of condensed fuel flames with gases in microgravity
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Emulation of condensed fuel flames with gases in microgravity

机译：用微重力气体模拟冷凝的燃料火焰

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摘要

A gaseous fuel burner has been designed to emulate the burning behavior of liquids and solids. The burner is hypothesized to represent a liquid or solid fuel through four key properties: heat of combustion, heat of gasification, vaporization temperature, and laminar smoke point. Previous work supports this concept, and it has been demonstrated for four real fuels. The technique is applied to flames during 5 s of microgravity. Tests were conducted with a burner of 25 mm diameter, two gaseous fuels, and a range of flow rates, oxygen concentrations, and pressures. The microgravity tests reveal a condition appearing to approach a steady state but sometimes with apparent local extinction. The flame typically retains a hemispherical shape, with some indication of slowing growth, and nearly asymptotic steady flame heat flux. A one-dimensional steady-state theory reasonably correlates the data for flame heat flux and flame length. The burning rate per unit area is found to be inversely dependent on diameter and a function of the ratio of the ambient oxygen mass fraction to the heat of gasification. The flame length to diameter ratio depends on two dimensionless parameters: Spalding B number and the ratio of the heat of combustion per unit mass of ambient oxygen to the heat of combustion of the fuel mixture stream. (C) 2015 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：气态燃料燃烧器已被设计为模仿液体和固体的燃烧行为。假设燃烧器通过四个关键特性代表液体或固体燃料：燃烧热，气化热，汽化温度和层状烟点。先前的工作支持了此概念，并且已针对四种实际燃料进行了演示。该技术适用于5秒钟的微重力火焰。使用直径为25 mm的燃烧器，两种气态燃料以及一定范围的流速，氧气浓度和压力进行了测试。微重力测试显示出一种状况似乎趋于稳定，但有时会出现局部灭绝。火焰通常保持半球形，有些迹象表明生长缓慢，并且接近渐近稳定的火焰热通量。一维稳态理论将火焰热通量和火焰长度的数据合理地关联起来。发现每单位面积的燃烧速率与直径成反比，并且与环境氧气质量分数与气化热之比的函数有关。火焰长度与直径之比取决于两个无量纲的参数：斯伯丁B数和每单位质量的环境氧燃烧热与燃料混合物流燃烧热的比率。 （C）2015年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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  • 来源
    《Combustion and Flame》 |2015年第10期|3449-3455|共7页
  • 作者

    Zhang Yi; Kim Matt; Guo Haiging; Sunderland Peter B.; Quintiere James G.; deRis John; Stocker Dennis P.;

  • 作者单位

    Univ Maryland, Dept Fire Protect Engn, College Pk, MD 20742 USA;

    Univ Maryland, Dept Fire Protect Engn, College Pk, MD 20742 USA;

    Univ Maryland, Dept Fire Protect Engn, College Pk, MD 20742 USA;

    Univ Maryland, Dept Fire Protect Engn, College Pk, MD 20742 USA;

    Univ Maryland, Dept Fire Protect Engn, College Pk, MD 20742 USA;

    FM Global, Johnston, IA USA;

    NASA, Glenn Res Ctr, New York, NY USA;

  • 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

    Diffusion flame; Fire; Heat flux; Microgravity;

    机译：扩散火焰;着火;热通量;微重力;

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