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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

STUDY OF TURBULENT REACTING FLOW IN A JET ENGINE COMBUSTOR USING LARGE-EDDY SIMULATION

pages 673-678
DOI: 10.1615/TSFP6.1080
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RÉSUMÉ

Large-eddy simulation (LES) is carried out to understand turbulent mixing, cooling, and combustion dynamics in a gas turbine engine combustor. An LES technique conserving discrete kinetic energy on arbitrary shaped unstructured grids is coupled with a Lagrangian particle tracking method for liquid fuel atomization and evaporation, and a presumed probability density function approach for turbulent combustion. A systematic analysis of the mean and turbulent flow fields elucidates dynamics of important flow structures and mechanisms for turbulent mixing and cooling. Predicted flow splits through the injector swirler and inner and outer dilution shrouds are in good agreement with experimental measurements. The mean temperature, temperature profile, and NO mole fraction at the exit of the combustor are also found to agree well with experimental data. The dilution jets produce significant magnitudes of the derivatives of the mean radial and circumferential velocity components, thereby dominating turbulent kinetic energy production. The present study suggests that combustor exit flow is highly unsteady and consists of small-scale velocity fluctuations and intermittent large-scale high temperature flow structures.

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