Unsteady analysis of acoustic pressure response in N2 diluted H2 and air diffusion flames

Acoustic pressure response of diluted hydrogen-air diffusion flames is investigated numerically by adopting a fully unsteady analysis of flame structures in a counterflow. Without the restriction of the previous quasi-steady approach, acoustic response to pressure oscillation is investigated in a wide range of frequencies and for two representative pressure regimes, namely, low- and medium-pressure regimes. Acoustic amplification/attenuation and...