Autoignited laminar lifted flames of methane/hydrogen mixtures in heated coflow air
Type
ArticleAuthors
Choi, ByungchulChung, Suk Ho

KAUST Department
Clean Combustion Research CenterCombustion and Laser Diagnostics Laboratory
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2012-04Permanent link to this record
http://hdl.handle.net/10754/562140
Metadata
Show full item recordAbstract
Autoignited lifted flame behavior in laminar jets of methane/hydrogen mixture fuels has been investigated experimentally in heated coflow air. Three regimes of autoignited lifted flames were identified depending on initial temperature and hydrogen to methane ratio. At relatively high initial temperature, addition of a small amount of hydrogen to methane improved ignition appreciably such that the liftoff height decreased significantly. In this hydrogen-assisted autoignition regime, the liftoff height increased with jet velocity, and the characteristic flow time - defined as the ratio of liftoff height to jet velocity - correlated well with the square of the adiabatic ignition delay time. At lower temperature, the autoignited lifted flame demonstrated a unique feature in that the liftoff height decreased with increasing jet velocity. Such behavior has never been observed in lifted laminar and turbulent jet flames. A transition regime existed between these two regimes at intermediate temperature. © 2011 The Combustion Institute.Sponsors
This work was supported by Saudi Aramco through KAUST CCRC. We are thankful to Drs. Tidjani Niass and Amer Amer for their helpful suggestions.Publisher
Elsevier BVJournal
Combustion and Flameae974a485f413a2113503eed53cd6c53
10.1016/j.combustflame.2011.11.016