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124 Eugen Rusu et al.
Fig. 6 – HC emissions versus air fuel ratio.
Comparing NOx emissions result with power output we can conclude that
the best way to work with hydrogen in addition regardless the percentage of
hydrogen (1%...20%), best air fuel ratio is 1.62…2. At this air fuel ratio power
output is similar to that of gasoline, also NOx and HC emissions are lower
comparative when using gasoline, (Fig. 7).
Fig. 7– Effective power versus air fuel ratio.
6. Conclusions
As a result of the simulation next conclusions were drawn:
a) The addition of hydrogen improves engine operating at lean
conditions.
b) The maximum temperature increases when adds more hydrogen with
negative effect on the NOx emission level. When using leaner dosages NOx
emission level is reduced.