Abstract
Dominant parameters in unsteady flame structure of hydrogen/air counterflow premixed flame are investigated by numerical simulation with elementary reaction model. In order to investigate unsteady flame, a sinusoidal fluctuation is added to the inlet velocity of hydrogen/air premixed mixture. The conditions of various fluctuation frequencies and average velocities of the inlet velocity are considered. As candidates of dominant parameters, the reaction progress variables defined with mass fraction of hydrogen evaluated at flame front are proposed. It is found that the maximum heat release rate and the maximum mass production rate of various species are determined by the reaction progress variables.
