Quantitative laser-based measurements and detailed chemical kinetic modeling of nitric oxide concentrations in methane-air counterflow diffusion flames

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• 作者：Volker  ; Sick¹ ; Frank  ; Hildenbrand² ; Peter  ; Lindstedt³
• 刊名：Symposium (International) on Combustion
• 出版年：1998
• 出版时间：1998
• 年：1998
• 卷：27
• 期：1
• 页码：1401-1409
• 全文大小：135 K

文摘

The formation and destruction of nitric oxide in diffusion flames remains a topic of particular relevance to practical applications. In the present work, the chemistry of NO in atmospheric methane-air counterflow diffusion flames is investigated by quantitative laser spectroscopic measurements and detailed chemical kinetic modeling. Highly resolved spatial NO concentration profiles have been obtained usinglaser-induced fluorescence (LIF), and the influence of temperature and collisions on the quantitative interpretation of LIF signals is described. Experimental nitric oxide profiles obtained in pure CH₄-air flames and CH₄-air flames seeded with NO and NH₃ are presented. Comparisons are made with computations featuring a detailed chemical kinetic mechanism with 74 species and 506 reactions. It is shown that acceptable agreement is obtained, and the main areas of uncertainty are outlined. Thus, three current recommendations (GRI Mech. 2.11, Dean et al., and Lindackers et al.) for the ¡°prompt?NO formation channel CH+N₂ are assessed. In apparent agreement with the theoretical study of Miller and Walch, the present work tentatively supports the determination of Dean et al., and it is suggested that the computer-optimized rate used in GRI-Mech. 2.11 is significantly (?50 % ) too slow. It is further shown that methane diffusion flames differ from their premixed counterparts and that reaction channels such as CH with H₂O and NO with HCCO exert a primary influence on computed results.