Accounting for convective effects in zero-Mach-number thermoacoustic models - Archive ouverte HAL Access content directly
Journal Articles Journal of Sound and Vibration Year : 2014

Accounting for convective effects in zero-Mach-number thermoacoustic models

Abstract

This paper presents a methodology to account for some mean-flow effects on thermo-acoustic instabilities when using the zero-Mach-number assumption. It is shown that when a computational domain is represented under the M=0 assumption, a nonzero-Mach-number element can simply be taken into account by imposing a proper acoustic impedance at the boundaries so as to mimic the mean flow effects in the outer, not computed flow domain. A model that accounts for the coupling between acoustic and entropy waves is presented. It relies on a "delayed entropy coupled boundary condition" (DECBC) for the Helmholtz equation satisfied by the acoustic pressure. The model proves able to capture low-frequency entropic modes even without mean-flow terms in the fluctuating pressure equation.
Fichier principal
Vignette du fichier
Motheau_10077.pdf (1.08 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-00905802 , version 1 (18-11-2013)

Identifiers

Cite

Emmanuel Motheau, Laurent Selle, Franck Nicoud. Accounting for convective effects in zero-Mach-number thermoacoustic models. Journal of Sound and Vibration, 2014, 333, pp.246-262. ⟨10.1016/j.jsv.2013.08.046⟩. ⟨hal-00905802⟩
125 View
251 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More