a b s t r a c t
The hydrogen-diesel dual fuel combustion was investigated in direct injection (DI) diesel
engine. The investigation presented in this paper preferred hydrogen as a long-term
renewable and least polluting fuel among various alternative fuels for internal combustion
(IC) engines. In the current study a diesel engine is made to run using hydrogen in dual
fuel mode with diesel, where hydrogen is introduced into the intake manifold using an
LPG-CNG injector and pilot diesel is injected using diesel injectors. The hydrogen energy
contents of the total fuel were varied from 0%, 11%, 17%, 30% and 42% (the 0% hydrogen
energy content represents neat diesel fuel), were experienced at (1500 ± 10) rpm of
invariable engine speed and 5.2 kW of consistent indicated power. The test results showed
the improvement in brake thermal efficiency (BTHE) of the engine, reduction in brake
specific energy consumption (BSEC) with an increasing hydrogen energy fraction.
Furthermore, indicated specific CO, CO2 and smoke emissions decrease with an increasing
percentage of hydrogen energy content. Conversely, indicated specific NOx emissions increases
with increase in hydrogen content. In addition to that, it was also observed that
there was a sharp increase in peak in-cylinder pressure and the peak heat release rate
values with the increasing hydrogen rate.
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