Acoustic Response of Near-Equilibrium Diffusion Flames with Large Activation Energies

The interaction of non-premixed flamelets with acoustic pressure waves of large characteristic wavelength, central to the development of acoustic instabilities in liquid-propellant rocket engines, is investigated by evaluating the periodic response of a counterflow diffusion flame subject to a harmonic pressure variation. An irreversible step with an Arrhenius rate having large activation energy is used to model the exothermic reaction between...