Proper Orthogonal Decomposition Analysis of Sound Generation in a Turbulent Premixed Flame

Abstract

This paper presents proper orthogonal decomposition (POD) method of a Direct Numerical Simulation (DNS) dataset of a turbulent premixed flame. The POD results show that the combustion process is the dominant source of noise at low frequencies, whereas the inlet noise becomes an increasingly important source at higher frequencies. It is also shown that the first three POD modes, that are mainly associated with the noise produced by the flame, can provide a reasonable estimate of the DNS spectra at low frequencies.