高温予混合火炎の漸近解析 : エンタルピー一定条件下における火炎面の不安定性(反応・多相系燃焼・反応(2),一般講演)

概要

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Asymptotic analysis on premixed flames with high-temperature unburned gases was performed to elucidate the instability of flame fronts. 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 instability of high-temperature premixed flames under the constant-enthalpy conditions, we obtained the burning velocity and instability level changing the unburned-gas temperature, where the burned-gas temperature was constant. As the unburned-gas temperature became higher, the burning velocity increased and the instability level became higher, except for low reaction exponents. This was because of the decrease of the difference in temperature between burned and unburned gases.
2009-09-02