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首页> 外文会议>US Combustion Meeting; 20070325-28; San Diego,CA(US) >Microgravity Droplet Combustion in CO_2 Enriched Environments at Elevated Pressures
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Microgravity Droplet Combustion in CO_2 Enriched Environments at Elevated Pressures

机译：高压下富含CO_2的环境中的微重力液滴燃烧

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摘要

Microgravity droplet combustion experiments were performed in elevated concentrations of CO_2 at pressures of 1.0 atm, 3.0 atm, and 5.0 atm to examine the effects of a radiatively participating suppression agent in space applications. Methanol and n-heptane droplets, with an initial diameter of 2.0 mm supported on a quartz fiber, were used in these experiments. The ambient O_2 concentration was held constant at 21% and the CO_2 concentrations ranged from 0% to a maximum of 70%, by volume with the balance consisting of N_2 . Results from the methanol tests showed slight decreases in burning rates with increased CO_2 concentrations at all ambient pressures. The n-heptane tests show slight increases in burning rates with increasing CO_2 concentrations at each pressure level. Instantaneous radiative heat flux was also measured using both a broadband radiometer (i.e., wavelengths from 0.6 μm to 40.0μm) and a narrowband radiometer (i.e., centered at 5.6 μm with a filter width at half maximum of 0.15 μm). Radiative exchanges between the droplet and surrounding gases as well as the soot field produce departures from the classical quasisteady theory which would predict a decrease in burning rates with increasing CO_2 concentrations in microgravity.
机译：在1.0 atm，3.0 atm和5.0 atm的压力下，在升高浓度的CO_2中进行微重力液滴燃烧实验，以检验辐射参与抑制剂在空间应用中的作用。在这些实验中，使用了直径为2.0 mm的石英液滴支撑的甲醇和正庚烷液滴。周围的O_2浓度保持恒定在21％，CO_2的浓度范围为0％至最大70％（体积），其余部分由N_2组成。甲醇测试的结果表明，在所有环境压力下，燃烧速率均随CO_2浓度的增加而略有降低。正庚烷测试显示，在每个压力水平下，燃烧速率随CO_2浓度的增加而略有增加。瞬时辐射热通量也使用宽带辐射计（即波长从0.6μm至40.0μm）和窄带辐射计（即以5.6μm为中心，滤光片宽度的一半为0.15μm）进行测量。液滴与周围气体以及烟灰场之间的辐射交换产生了与经典拟稳态理论的背离，后者可以预测随着微重力中CO_2浓度的增加，燃烧速率会降低。

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  • 会议地点 San DiegoCA(US)
  • 作者

    M. C. Hicks; V. Nayagam; F. A. Williams;

  • 作者单位

    NASA Glenn Research Center, Cleveland, Ohio 44135, USA;

    National Center for Space Exploration Research, Cleveland, Ohio 44135, USA;

    Center for Energy Research, Department of Mechanical and Aerospace Engineering, University of California at San Diego, La;

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  • 正文语种 eng
  • 中图分类 理论;
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