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Large-Eddy Simulation of combustion instabilities in a variable-length combustor

Garby, Romain and Selle, Laurent and Poinsot, Thierry Large-Eddy Simulation of combustion instabilities in a variable-length combustor. (2013) Comptes Rendus Mécanique, 341 (1-2). 220-229. ISSN 1631-0721

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Official URL: http://dx.doi.org/10.1016/j.crme.2012.10.020

Abstract

This article presents a simulation of a model rocket combustor with continuously variable acoustic properties thanks to a variable-length injector tube. Fully compressible Large-Eddy Simulations are conducted using the AVBP code. An original flame stabilization mechanism is uncovered where the recirculation of hot gases in the corner recirculation zone creates a triple flame structure. An unstable operating point is then chosen to investigate the mech- anism of the instability. The simulations are compared to experimental results in terms of frequency and mode structure. Two-dimensional axi-symmetric computations are com- pared to full 3D simulations in order to assess the validity of the axi-symmetry assumption for the prediction of mean and unsteady features of this flow. Despite the inaccuracies in- herent to the 2D description of a turbulent flow, for this configuration and the particular operating point investigated, the axi-symmetric simulation qualitatively reproduces some features of the instability.

Item Type:Article
Additional Information:Thanks to Elsevier Masson editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Comptes Rendus Mécanique website : http://dx.doi.org/10.1016/j.crme.2012.10.020
Audience (journal):International journal (no peer-reviewed)
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:20 Mar 2013 13:16

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