酸素富化空気を用いた対向流火炎の火炎構造およびNO_x生成に関する数値解析 : 速度こう配がNO_x生成の抑制に与える影響(熱工学,内燃機関,動力など)

概要

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In this study, numerical simulations for the flame structure and NO_x formation of counter flow diffusion flame with oxygen-enriched air were made by using the GRI chemical reaction mechanism (NO_x included) in order to elucidate the effect of strain rate on reduction of NO_x formation. The following conclusions were reached: (1) As the strain rate increases, the maximum heat release rate increases, and the width of high-temperature zone becomes narrow. (2) In the case where the strain rate is small, the thermal NO mechanism is dominant of NO formation, and NO formation by the prompt NO mechanism is negative. (3) As the strain rate increases, NO formation by the prompt NO mechanism increases, and it becomes positive when strain rate exceeds 400 s^<-1>. At the same time, since the width of high-temperature zone becomes narrow, that by the thermal NO mechanism decreases, and it becomes smaller than that by prompt NO mechanism for the case where the strain rate exceeds 1200 s^<-1>. The decrease rate of thermal NO is bigger than the increase rate of prompt NO, so that the total NO formation is reduced by the increase in the strain rate.
社団法人日本機械学会の論文
2004-10-25