Abstract
Asymptotic analysis on lean premixed flames with high-temperature unburned gases was performed to obtain the burning velocity analytically. One-dimensional steady reactive flow with sufficiently low Mach numbers was treated, and a one-step irreversible chemical reaction with large activation energies was assumed. Through asymptotic analysis, we obtained the formula for the burning velocity, depending on the temperature of burned and unburned gases and on the mass fraction of fuel. To study the characteristics of high-temperature lean premixed flames, we changed the unburned-gas temperature under the constant-enthalpy conditions where the burned-gas temperature was constant. As the unburned-gas temperature became higher, the mass flux density of the unburned gas increased. This was because of the decrease of the difference in temperature between burned and unburned gases.
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