Abstract
Many facilities, e.g. reheat gas turbines or internal combustion engines, are operated with hydrocarbon fuels at elevated preheat temperatures such that conditions may be encountered where the flame is not stabilized by flame propagation, but by self-ignition. A model for turbulent reacting flow in this combustion regime has been developed, based on an ignition indicator representing the evolution of a pool of chemical intermediates. Interactions between turbulence and chemistry are taken into account using a new Monte-Carlo joint PDF approach. The joint PDF is not approximated by an analytical function, but by representative ensembles of particles, which are generated with a biased random number generator. Mean reaction rates are computed from the first and second moments - including co-variances - of those variables which describe the thermo-chemical state of the mixture. It is possible to calculate mean reaction rates in a pre-processing step and store them in a lookup-table table for use in a subsequent CFD simulation, making the approach very efficient. The model has been implemented in a CFD code and validated against an industrial gas turbine burner configuration. It has been found that the model describes the combustion process for a range of operating conditions with good accuracy.
Original language | English |
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Pages | 195-205 |
Number of pages | 11 |
DOIs | |
State | Published - 2003 |
Externally published | Yes |
Event | 2003 ASME Turbo Expo - Atlanta, GA, United States Duration: 16 Jun 2003 → 19 Jun 2003 |
Conference
Conference | 2003 ASME Turbo Expo |
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Country/Territory | United States |
City | Atlanta, GA |
Period | 16/06/03 → 19/06/03 |