A DNS based analysis of noise generation by a turbulent premixed flame

Abstract

Direct numerical simulation (DNS) is used to study sound generation by an unconfined, turbulent premixed flame. The computational grid is set up such that both the near and far fields are fully resolved, and simple chemistry is used to reduce the computational cost. In keeping with earlier, simpler studies by the group, flame annihilation events are again observed as strong monopolar sources of sound, and their amplitudes are consistent with the groups previously published scalings. Analysis of the radiated sound then shows broadband spectra, with the observed frequency of peak amplitude being consistent with those observed experimentally by others.