Joint use of compressible large-eddy simulation and Helmholtz solvers for the analysis of rotating modes in an industrial swirled burner

Abstract : Rotating modes are instabilities which are commonly observed in swirling flows. This paper shows that in complex-geometry combustors, such modes can appear under both cold and reacting conditions but that they have different Sources: while the cold flow rotating mode is essentially hydrodynamic and corresponds to the well-known PVC (precessing vortex core) observed in many swirled unconfined flows, the rotating structure observed for the reacting case inside the combustion chamber is not hydrodynamically but acoustically controlled. The two transverse acoustic modes of the combustion chamber couple and create a rotating motion of the flame which leads to a self-sustained turning mode which has the features of a classical PVC but a very different source (acoustics and not hydrodynamics). These results are obtained using two complementary tools: compressible LES (large-eddy simulation) which solve the turbulent flow and the acoustics simultaneously (but at a high cost) and the Helmholtz solver which extracts only the acoustic modes using the mean flow field and linear acoustics assumptions.
Complete list of metadatas

Cited literature [21 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-00908256
Contributor : Franck Nicoud <>
Submitted on : Friday, November 22, 2013 - 3:22:52 PM
Last modification on : Friday, June 14, 2019 - 6:31:06 PM
Long-term archiving on : Sunday, February 23, 2014 - 4:29:03 AM

File

SelleBenoit-CandF.pdf
Files produced by the author(s)

Identifiers

Citation

Laurent Selle, Laurent Benoit, Thierry Poinsot, Franck Nicoud, Werner Krebs. Joint use of compressible large-eddy simulation and Helmholtz solvers for the analysis of rotating modes in an industrial swirled burner. Combustion and Flame, Elsevier, 2006, 145 (1-2), pp.194-205. ⟨10.1016/j.combustflame.2005.10.017⟩. ⟨hal-00908256⟩

Share

Metrics

Record views

231

Files downloads

245