微小重力環境を利用した壁面近傍における液滴燃焼に関する実験的研究(熱工学,内燃機関,動力など)

概要

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This paper presents results of an experimental investigation on the combustion of a single droplet in the vicinity of a cold wall in microgravity. The fuel was n-heptane, and the ambient gas was air at normal atmospheric pressure. Two types of plates with different reflectivities were used as the cold wall. Droplet burning lifetimes, burning-rate constants, durations of the initial heat-up period and several flame characteristic scales are presented and discussed. The results showed that the wall causes flame deformation and flame extinction when it is close enough to the droplet. The droplet-burning lifetime reaches a minimum at a certain spacing between the droplet and the wall surface. This combustion enhancement is principally seen as a reduction of the initial heat-up period. It is suggested that the reduction of the total burning time is due to enhanced conductive heat transfer to the droplet caused by flame deformation. The present configuration is similar to that of combustion of a droplet pair. Comparisons with results for droplet-pair combustion are also presented. From the comparisons, several similarities were found, but the mechanism appears to be different. These differences are also discussed in the paper.
社団法人日本機械学会の論文
2003-12-25