A methodology for computing steady turbulent reacting flows in combustors is presented. A 3-D computational fluid dynamics (CFD) proprietary code and a kinetic post-processor (KPP) have been coupled and applied to calculate the gas temperature and pollutant emissions. A first application of the above calculation methodology has been carried out on Lean-Burn innovative injection system (PERM), designed and developed in the frame of the EU program for NEW Aero engine Core concepts NEWAC [1]. This injection system was studied experimentally in a tubular combustor in order to perform the first assessment in terms pollutant emissions at the outlet at different operating conditions. Measurements and the corresponding model results refer to the tubular combustor operating at medium pressure (8 bar) and different AFRs. The model predictions are compared with experimental results and globally the agreement is satisfactory, especially for NO emissions. The observed deviation between measurements and prediction is discussed for both CO and NO2 and further investigations are underway to explain the observed behavior. The analysis of data provides useful information for further improvements in modeling and experimental activities. A validation activity in a wider range of operating conditions, both in terms of inlet air pressure and temperature, is planned to further validate the modeling approach and to provide new experimental data aimed at addressing the mechanisms of CO and NOx emissions from lean combustion systems.

Fluid dynamics and detailed kinetic modeling of pollutant emissions from lean combustion systems

FRASSOLDATI, ALESSIO;CUOCI, ALBERTO;FARAVELLI, TIZIANO;RANZI, ELISEO MARIA;
2009-01-01

Abstract

A methodology for computing steady turbulent reacting flows in combustors is presented. A 3-D computational fluid dynamics (CFD) proprietary code and a kinetic post-processor (KPP) have been coupled and applied to calculate the gas temperature and pollutant emissions. A first application of the above calculation methodology has been carried out on Lean-Burn innovative injection system (PERM), designed and developed in the frame of the EU program for NEW Aero engine Core concepts NEWAC [1]. This injection system was studied experimentally in a tubular combustor in order to perform the first assessment in terms pollutant emissions at the outlet at different operating conditions. Measurements and the corresponding model results refer to the tubular combustor operating at medium pressure (8 bar) and different AFRs. The model predictions are compared with experimental results and globally the agreement is satisfactory, especially for NO emissions. The observed deviation between measurements and prediction is discussed for both CO and NO2 and further investigations are underway to explain the observed behavior. The analysis of data provides useful information for further improvements in modeling and experimental activities. A validation activity in a wider range of operating conditions, both in terms of inlet air pressure and temperature, is planned to further validate the modeling approach and to provide new experimental data aimed at addressing the mechanisms of CO and NOx emissions from lean combustion systems.
2009
MCS6 Sixth Mediterranean Combustion Symposium
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/553132
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