TY - JOUR
T1 - An experimental investigation on self-acceleration of cellular spherical flames
AU - Wu, Fujia
AU - Jomaas, Grunde
AU - Law, Chung K.
N1 - Funding Information:
This work was primarily supported by the Combustion Energy Frontier Research Center , an Energy Frontier Research Center funded by the US Department of Energy, Office of Basic Energy Sciences under Award Number DE-SC0001198 . FJW and GJ were in addition partially supported by AFOSR and NASA, respectively.
PY - 2013
Y1 - 2013
N2 - The cells that continuously develop over the flame surface of an expanding spherical flame increase its area and thereby the global propagation rate, resulting in the possibility of self-acceleration. The present study examines whether this self-acceleration could be self-similar, and, if so, whether it could also be selfturbulizing. Extensive experiments at elevated pressures and thereby reduced laminar flame thicknesses and enhanced propensity to exhibit Darrieus-Landau instability were conducted for hydrogen/air mixtures over an extensive range of equivalence ratios. The results demonstrate the strong possibility of self-similar flame acceleration, weak influence of the system pressure and diffusional-thermal instability, and a corresponding moderate spread in the power-law acceleration exponent.
AB - The cells that continuously develop over the flame surface of an expanding spherical flame increase its area and thereby the global propagation rate, resulting in the possibility of self-acceleration. The present study examines whether this self-acceleration could be self-similar, and, if so, whether it could also be selfturbulizing. Extensive experiments at elevated pressures and thereby reduced laminar flame thicknesses and enhanced propensity to exhibit Darrieus-Landau instability were conducted for hydrogen/air mixtures over an extensive range of equivalence ratios. The results demonstrate the strong possibility of self-similar flame acceleration, weak influence of the system pressure and diffusional-thermal instability, and a corresponding moderate spread in the power-law acceleration exponent.
KW - Cellular flames
KW - Expanding spherical flame
KW - Hydrodynamic (Darrieus-Landau) instability
KW - Self-acceleration
KW - Self-similar propagation
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U2 - 10.1016/j.proci.2012.05.068
DO - 10.1016/j.proci.2012.05.068
M3 - Article
AN - SCOPUS:84872033504
SN - 1540-7489
VL - 34
SP - 937
EP - 945
JO - Proceedings of the Combustion Institute
JF - Proceedings of the Combustion Institute
IS - 1
ER -