2208 対向流拡散火炎解析によるNOx排出特性への火炎希釈効果の解明(G06-4 熱工学(4) 燃焼(2),21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

抄録

A numerical simulation of counterflow diffusion flame was conducted to investigate the effect of fuel dilution with helium and argon on NOx emission. The counterflow diffusion flame is modeled using the Opposed-Flow Flame in the CHEMKIN package. The flame stretch increases the global formation rate of EINOx whereas decreases it rapidly near the extinction condition in the laminar flame. This tendency can be observed over the entire tested range of dilutions with Ar and He. On the other hand, it was reported that the flame stretch decreases the formation rate in the high Ar-diluted turbulent flames. An estimation of scalar dissipation rate in the turbulent Ar-diluted turbulent flames reveals that the decrease in the formation rate is due to an increase in the flame stretch.