On sound production from the interaction of two planar flames

Abstract

This paper presents a numerical and theoretical investigation of the sound generated by planar premixed flame annihilation. The compressible Navier-Stokes, energy, and progress variable equations are first solved using Direct Numerical Simulation (DNS), resolving both the flame dynamics and the acoustics. These simulations show that the amplitude of the far-field sound produced by the planar annihilation events depends on the laminar flame speed and temperature ratio. A theory is then presented that relates the far-field sound to the flame annihilation event by using a previously reported and extended form of Lighthill's acoustic analogy. A comparison with the numerical results shows that th..