Diesel flow was reduced up to
10% of the baseline value and hydrogen flow was increased
until the engine attained the rated speed of 1500 rpm. They
concentrated on emission and performance characteristics of
the engine at various hydrogen doses and concluded that
knock can occur if only the hydrogen enrichment equals 50%
or more at full load of the engine. Furthermore they found
reduction in hydro carbons (HC) and (NOx) emissions. Based
on their study they concluded that the optimal hydrogen
enrichment with diesel was 30%. Senthil et al. [12]