708 微小重力下におけるろ紙の可視光によるふく射着火現象の観察(OS7-2 マイクログラビティー)(OS7 北海道における航空宇宙工学研究の進展と未来)

概要

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An experiment on radiative ignition of solid fuel has been performed in microgravity to determine the events occurring in the ignition processes in a quiescent field. Filter paper was irradiated by Diode laser (800.1nm) in various oxygen concentrations (0-50%). Using the Diode laser makes it possible to observe the radiative ignition without the effect of gas phase absorption. The ignition delay was measured for various experimental conditions. The density change of gas phase before ignition were observed by a Mach-Zehnder interferometer. The results showed that heat conduction from the sample surface induced weak chemical reaction in the vicinity of the sample surface, which propagated outward to reach strong combustion. Ignition delay time decreased with increase in O_2 concentration because mixture near the sample surface might contain more oxygen with higher oxygen atmosphere to cause immediate transition from the weak chemical reaction to the strong combustion.
社団法人日本機械学会の論文
2001-09-25