微小重力下におけるろ紙の近赤外光によるふく射着火現象の観察(熱工学,内燃機関,動力など)

概要

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The objective of this work is to provide information about the details of the gas phase reaction on solids material ignition. An experiment of radiative ignition has been performed in microgravity to determine the events occurring in ignition processes in a quiescent field. Filter papers were irradiated by Diode laser (800.1 nm), which is little absorbed in gas phase, in various oxygen concentrations (0-50%). Using this 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
2002-02-25