514 薄膜 PMMA 上を伝播する火炎に及ぼすふく射損失の効果

概要

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Flame spread over a thin PMMA sheet in microgravity is investigated analytically and experimentally. A scale analysis yields a simple equation, η+R/ζ=1,which states the radiation loss is a function of relative flow velocity and the fuel thickness. The reduction in the relative flow velocity enlarges the size of preheat zone, which increases the amount of heat transfer by radiation. The presence of radiation loss reduces the spread rate and also may occur extinction. The experimental result shows that the spread rate becomes the minimum when the relative flow velocity is close to zero. Tit is also found that steady flame spread is established even in a quiescent condition if the R is sufficient low. The interferometer measurement shows the expansion of preheat zone that leads the increase of radiation loss, and the decrease in temperature of the flame front near extinction condition.
社団法人日本機械学会の論文
2002-03-14