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.
Liste complète des métadonnées

Cited literature [46 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-00905802
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Monday, November 18, 2013 - 4:44:52 PM
Last modification on : Friday, April 12, 2019 - 4:22:40 PM
Document(s) archivé(s) le : Wednesday, February 19, 2014 - 12:15:12 PM

File

Motheau_10077.pdf
Files produced by the author(s)

Identifiers

Citation

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

Share

Metrics

Record views

577

Files downloads

208