G060041 非予混合火炎の着火遅れに対するスカラー散逸率の影響([G06004]熱工学部門一般セッション(4):着火)

概要

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The objective of this study is to suggest a new method to predict the stability limit of high temperature air combustion. For the first stage of this study, the flamelet equation is solved numerically to investigate the effects of the scalar dissipation rate and the dilution with burned gas on ignition delay. Methane was used as fuel. Ignition time is defined as the time at which a temporal increase of maximum temperature becomes maximum. The ignition delay time increases with the scalar dissipation rate in the higher range of x. However, in the lower range of x, the time decreases with x. The ignition delay time based on the maximum temperature includes durations of radical pool growth and of movement of most reactive region. In the lower range of x, the increase in the movement speed decreases the ignition delay time with x. With the increase in the dilution ratio K, the ignition delay time decreases, and then increases. This trend is attributed to the increase in temperature and the decrease in species concentration with K. The introduction of chemical characteristics time provides the generalization of ignition delay time for all dilution ratios.
一般社団法人日本機械学会の論文
2011-09-11