
706 Oxygen-Enhanced Combustion
in the literature, which reported increase of HC
emissions with certain oxygenated fuels.
8. An increase of NOx emissions with the amount
of oxygen in the fuel/air charge was observed in
both types of engines. However, the effects are
more severe in the case of oxygen-enriched air.
Overall, from the comparative evaluation of the two tech-
niques used for oxygen enrichment of diesel combus-
tion, it may be concluded that oxygen enhancement of
intake air increases the maximum combustion pressure
and thus the engine power output, without negatively
affecting the specic fuel consumption.
93
Inaddition, at
the maximum ...