Isi Bilimi Ve Teknigi Dergisi-Journal Of Thermal Science And Technology, vol.33, no.1, pp.33-41, 2013 (Journal Indexed in SCI Expanded)
This paper focuses on the effect of fuel-air ratio on the performance and cyclic variations of single cylinder
hydrogen and gasoline fueled spark ignition engine. The hydrogen fueled engine was operated at the wide-open
throttle (WOT) condition, while the engine fuelled with gasoline was operated with conventional carburetor mode by
varying the throttle opening to vary equivalence ratio. All the experiments were conducted at a constant engine speed
of 1600 rpm. The spark timing was set to minimum advance for best torque. As a result, it was found that there is
about 29% reduction in the maximum power output of the engine when operating with hydrogen. The equivalence
ratio could have been varied in the range of 0.3 < < 0.9 for hydrogen and of 0.8 < < 1.3 for gasoline. In all
combustion periods, cyclic variations for hydrogen engine were much lower than that of gasoline engine. As a
consequence, it was found that the engine gave similar output at equivalence ratio of = 1.1 for gasoline and = 0.6
for hydrogen. However the engine was operated more smoothly when fuelled with hydrogen.
Keywords: Hydrogen, Gasoline, Performance, Cyclic variations.