
367CFD Modeling of Oxygen-Enhanced Combustion
conditions compared to air-fuel conditions increases
the contribution of nonluminous radiation to overall
heat transfer. The radiation models commonly used for
air-fuel combustion can easily be extended for oxy-fuel
combustion.
All the radiation models popularly used for engi-
neering calculations suffer from inaccuracies due to
the complex nature of RTE. The P1 model, which is
the easiest to implement, simplies the solution of RTE
by neglecting the directional dependence of radiation.
Due to lack of directionality, the P1 method may pro-
duce erroneous results when optical thickness is low.
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The ...