Effect of a small amount of NO_x on extinction limit of lean premixed counterflow flame

详细信息    查看全文

• 作者：Kenichi Takita ; ^a ; ^{takita@scrj.mech.tohoku.ac.jp} ; Akihiro Morinaga^a ; Taku Someya^a
• 关键词：Extinction ; Counterflow flame ; NO_x catalytic effect ; Hydrocarbon fuel ; High pressure
• 刊名：Proceedings of the Combustion Institute
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：33
• 期：1
• 页码：1179-1186
• 全文大小：696 K

文摘

The effect of a small amount of NO_x (NO and NO₂) on the extinction of CH₄ and C₂H₄ flames was experimentally and numerically investigated. The extinction stretch rates of counterflow premixed flames when NO₂ was added to the mixture were measured at pressures ranging from 0.1 to 0.3 MPa. Calculations by using one-dimensional flame code with full chemistry were also conducted to clarify the effect of NO_x on the extinction limit and burning velocity. Extinction stretch rates of mixtures near the flammability limit increased by adding NO_x at high pressure in the experiments and the calculations. The catalytic effect of NO_x for CH₄ was via the low temperature chemistry involving CH₃, CH₃O, CH₃O₂, and HO₂, and that for C₂H₄ was via reactions that included HO₂ species. The change in extinction stretch rates with NO_x addition reflected the behavior of the burning velocity with NO_x addition. The burning velocities of mixtures near the flammability limit increased with the addition of NO_x at high pressure, the same as the extinction stretch rate.