Abstract
This paper treated high-temperature premixed flames to study the effects of the Lewis number on intrinsic instability under the constant-enthalpy conditions. The growth rate increased as the unburned-gas temperature became higher, which was due to the increase in burning velocity of a planar flame. In addition, the unstable range widened and the maximum growth rate increased as the Lewis number became lower, which was due to the diffusive-thermal effects. To elucidate the characteristics of cellular flames induced by intrinsic instability, a disturbance with the critical wave number was superimposed. The superimposed disturbance evolved, and then a cellular flame front formed. When the unburned-gas temperature was high, the behavior of cellular flames was mild. This was because that the difference in temperature between burned and unburned gases decreased.
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