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This study was investigated the effect of air-fuel ratio
(AFR) and engine speed on performance of the single cylinder hydrogen
fueled port injection engine. GT-Power was utilized to develop the computational
model for port injection engine. One dimensional gas dynamics model was
represented the flow and heat transfer in the components of the engine.
Throughout the study, air-fuel ratio was varied from stoichiometric mixture
to lean. The engine speeds were varied from 2500 to 4500 rpm. The results
show that the air-fuel ratio and engine speed were greatly influence on
the performance of hydrogen fueled engine especially Brake Mean Effective
Pressure (BMEP), thermal efficiency and brake specific fuel consumption
(BSFC). It was shown that decreases of the BMEP and brake thermal efficiency
with increases of the engine speed and air-fuel ratio while the increases
of the BSFC with increases of the speed and air-fuel ratio. The cylinder
temperature increases with increases of engine speed however temperature
decreases with increases of air-fuel ratio. The volumetric efficiency
increases with increases of engine speed and equivalent ratio. The volumetric
efficiency of the hydrogen engines with port injection is serious problem
and reduces the overall performance of the engine. This emphasized the
ability of retrofitting the traditional engines with hydrogen fuel with
minor modifications.
