
372 Oxygen-Enhanced Combustion
The modied JL
68
scheme proposed by Frassoldati
etal.
71
(see Section 14.4.3) includes the radicals H, OH,
and O in the reaction scheme. This scheme can be used
to estimate the radical concentrations directly in the
main combustion calculation, without signicant addi-
tional computational load.
14.7.1.2.2.2 Prompt (Fenimore) NO Formation Fenimore
183
observed that the Zeldovich mechanism alone could not
explain the increase in NO formation in the fuel-rich
regions of the hydrocarbon ame front. He proposed the
so-called prompt mechanism, namely, the dissociation
of molecular nitrogen initiated by CH and CH
2
ra