Sound generation by acceleration of density inhomogeneities and steady heat communication

Abstract

This paper presents a theoretical and numerical study on the relative significance of two mechanisms of sound generation encountered in combusting flows. A non-diffusive, one-dimensional, steady heat communicating flow, subjected to downstream travelling acoustic excitations is considered. It is first shown numerically and analytically that even without unsteadiness in heat communication the investigated flow can generate sound. Existing theories of acoustic energy reveal that such generation of sound can be due to either of acceleration of entropy disturbances or interactions between acoustics and steady heat communication. An analytical scaling analysis is then put forward to estimate the ..