Soot and Radiation in a Gas Turbine Combustor.
Final technical rept. 30 Sep 83-29 Sep 86,
PURDUE UNIV LAFAYETTE IN GAS TURBINE COMBUSTION LAB
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The effects of pressure, inlet air temperature, and fuel type on the soot threshold or critical equivalence ratio, are presented. Higher pressures yield lower soot thresholds, while no dependence on fuel type, as described by either the fuel hydrogen-to-carbon ratio, fuel molecular weight, number of carbon atoms, or number of carbon-carbon bonds, is observed. Variations in inlet air temperature have a complex effect however, the results clearly show that the experimentally measured flame temperature is central to a description of the incipient soot formation process. The critical equivalence ratio dependence on pressure and temperature is shown to agree with a two-step semi-global model for soot precursor evolution for pressures form 0.1 to 0.8 MPa, and measured flame temperatures between 1600 and 2400K. The effects of equivalence ratio, pressure, and fuel chemistry on total non-luminous flame radiation were also studied. Radiant intensity was highest for an equivalence ratio of unity and increased linearly with pressure from 0.4 to 0.8 MPa. Keywords Incipient soot formation, Flame radiation and emissivity, Premixed flames, Pressure dependence.
- Combustion and Ignition
- Jet and Gas Turbine Engines