Impact of Detailed Multicomponent Transport on Planar and Counterflow Hydrogen/Air and Methane/Air Flames
作者:
ALEXANDRE ERN,
VINCENT GIOVANGIGLI,
期刊:
Combustion Science and Technology
(Taylor Available online 1999)
卷期:
Volume 149,
issue 1-6
页码: 157-181
ISSN:0010-2202
年代: 1999
DOI:10.1080/00102209908952104
出版商: Taylor & Francis Group
关键词: Multicomponent transport;thermal diffusion;freely propagating flames;counterflow flames
数据来源: Taylor
摘要:
Freely propagating and counterflow laminar premixed steady hydrogen/air and methane/air flames are investigated numerically using complex chemistry and detailed transport models. All the transport coefficients in the mixture, including thermal diffusion coefficients, are evaluated using cost-effective, accurate algorithms derived recently by the authors from the kinetic theory of gases. Our numerical results provide a quantitative assessment of the impact of thermal diffusion on planar flame speed as a function of equivalence ratio and on extinction limits of counterflow flames as a function of either strain rate or equivalence ratio. In some cases, such as rich hydrogen/air flames, the effect of thermal diffusion is actually opposite to the one expected from a qualitative viewpoint or obtained with empirical models. In addition, we observe relevant effects of thermal diffusion on extinction of methane/air counterflow flames
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