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research-article

LARGE-EDDY SIMULATION OF LIGHT-ROUND IN AN ANNULAR COMBUSTOR WITH LIQUID SPRAY INJECTION AND COMPARISON WITH EXPERIMENTS

[+] Author and Article Information
Thea Lancien

Grande Voie des Vignes Chatenay-Malabry, 92295 France
thea.lancien@ecp.fr

Kevin Prieur

Grande Voie des Vignes Chatenay-Malabry, 92295 France
kevin.prieur@ecp.fr

DANIEL DUROX

Grande voie des vignes grande voie des vignes Châtenay-Malabry, 92295 France
daniel.durox@centralesupelec.fr

Sebastien Candel

EM2C laboratory, CNRS Chatenay-Malabry, 92295 France
sebastien.candel@ecp.fr

Ronan Vicquelin

Grande Voie des Vignes Chatenay-Malabry, 92295 France
ronan.vicquelin@ecp.fr

1Corresponding author.

ASME doi:10.1115/1.4037827 History: Received July 10, 2017; Revised July 20, 2017

Abstract

The light-round is defined as the process by which the flame initiated by an ignition spark propagates from burner to burner in an annular combustor, eventually leading to a stable combustion. Combining experiments and numerical simulation, it was recently demonstrated that under perfectly premixed conditions this process could be suitably described by large eddy simulation (LES) using massively parallel computations. The present investigation aims at developing light-round simulations in a configuration that is closer to that found in aero-engines by considering liquid n-heptane injection. The large-eddy simulation of the ignition sequence of a laboratory scale annular combustion chamber comprising sixteen swirled spray injectors is carried out with a mono-disperse Eulerian approach for the description of the liquid phase. The objective is to assess this modeling approach of the two-phase reactive flow during the ignition process. The simulation results are compared in terms of flame structure and light-round duration to the corresponding experimental images of the flame front recorded by a high-speed intensified CCD camera and to the corresponding experimental delays. The dynamics of the flow is also analyzed to identify and characterize mechanisms controlling flame propagation during the light-round process.

Copyright (c) 2017 by ASME
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