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Ninth International Symposium on Turbulence and Shear Flow Phenomena
June 30 - July 3, 2015, University of Melbourne, Australia

DOI: 10.1615/TSFP9

LARGE-EDDY SIMULATION OF SPRAY COMBUTION IN A SECTOR COMBUSTOR FOR REGIONAL JET AIRCRAFT ENGINE - EFFECT OF DOUBLE-WALL LINER ON NOx FORMATION -

pages 201-206
DOI: 10.1615/TSFP9.340
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RÉSUMÉ

Large-eddy simulation (LES) is applied to a turbulent spray combustion field in a sector combustor for a regional jet aircraft engine under development, and the effects of liner-cooling air flow outlet location (i.e., effect of single/double wall liners) on the combustion behaviour and NOx emission are investigated. The combustor is designed based on RQL (Rich burn, Quick quench, Lean burn) concept to reduce NOx emission. In the LES, Jet-A1 is used as liquid fuel, and individual droplet motion is tracked in a Lagrangian manner with a parcel model. As the turbulent combustion model, an extended flamelet/progress-variable approach, in which heat transfer between droplets and ambient gas including radiation and heat loss from walls can be taken into account, is employed. A detailed chemistry mechanism of Jet-A1 with 1537 reactions and 274 chemical species is used. The radiative heat transfer is computed by the discrete ordinate (DO) method. The LES results show general agreement with the experimental data, and the double wall liner design seems desirable for low NOx RQL combustor.

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