数値解析におけるふく射熱による固体燃料の自発着火の定義に関する検討

概要

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A numerical study was made to identify the most appropriate criterion to describe the spontaneous ignition of an externally heated solid fuel. Several ignition criteria were tested if they can describe correctly the effects of the gravity and ambient oexygen concentration on the ignition characteristics. The gravity affects significantly the ignition behavior since the buoyancy induced flow plays a key role in the transient mass and heat transfer processes, leading to the two distinct types of ignition^<(1)〜(3)>. Seven ignition criteria, which were often used in 1-D ignition process, were evaluated in this study. It was found that some of the criteria based on temperature profile lead to predict the occurrence of false ignition. This is because that complicate transport phenomena caused by buoyancy induced flow affect the transient temperature profile strongly, to produce the situation where the criteria were satisfied instantaneously. The study has shown that the criterion based on the local reaction rate was the universal and most appropriate one.
社団法人日本機械学会の論文
2000-01-25