Skip to Main content Skip to Navigation
Journal articles

Large Eddy Simulation of combustion instabilities in a lean partially premixed swirled flame

Abstract : This paper investigates one issue related to Large Eddy Simulations (LES) of self- excited combustion instabilities in gas-fueled swirled burners: the effects of incom- plete mixing between the gas injection and the combustion chamber. For simplicity reasons, many LES assume perfect premixing of the gases entering the combustion chamber. In practice this is rarely the case and this study addresses the question by comparing LES assuming perfect premixing and LES where the fuel jets are resolved and fuel/air mixing is explicitely computed. This is done for the Preccin- sta swirled burner which has been carefully studied experimentally at DLR. All previous LES studies of Preccinsta have assumed perfect premixing and this work demonstrates that this assumption is reasonable for stable flows but is not accept- able to predict self-excited unstable cases. This is shown by comparing LES and experimental fields in terms of mean and RMS fields of temperature, species and velocities as well as mixture fraction pdfs and unsteady activity for two regimes: a stable one at equivalence ratio 0.83 and an unstable one at 0.7.
Complete list of metadata

Cited literature [27 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-00811961
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Thursday, April 11, 2013 - 2:10:56 PM
Last modification on : Tuesday, May 4, 2021 - 3:41:58 PM
Long-term archiving on: : Friday, July 12, 2013 - 4:06:37 AM

File

Franzelli_8564.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Benedetta Giulia Franzelli, Eleonore Riber, Laurent Y.M. Gicquel, Thierry Poinsot. Large Eddy Simulation of combustion instabilities in a lean partially premixed swirled flame. Combustion and Flame, Elsevier, 2012, vol. 159, pp. 621-637. ⟨10.1016/j.combustflame.2011.08.004⟩. ⟨hal-00811961⟩

Share

Metrics

Record views

223

Files downloads

834