Impact of Various Compression Ratio on the Compression Ignition Engine with Diesel and Jatropha Biodiesel

The present experimental investigation evaluates the effects of using blends of diesel
fuel with 20% concentration of Methyl Ester of Jatropha biodiesel blended with various
compression ratio. Both the diesel and biodiesel fuel blend was injected at 23º BTDC to the
combustion chamber. The experiment was carried out with three different compression ratio.
Biodiesel was extracted from Jatropha oil, 20% (B20) concentration is found to be best blend
ratio from the earlier experimental study. The engine was maintained at various compression
ratio i.e., 17.5, 16.5 and 15.5 respectively. The main objective is to obtain minimum specific
fuel consumption, better efficiency and lesser Emission with different compression ratio. The results concluded that full load show an increase in efficiency when compared with diesel, highest efficiency is obtained with B20MEOJBA with compression ratio 17.5. It is noted that there is an increase in thermal efficiency as the blend ratio increases. Biodiesel blend has performance closer to diesel, but emission is reduced in all blends of B20MEOJBA compared to diesel. Thus this work focuses on the best compression ratio and suitability of biodiesel blends in diesel engine as an alternate fuel.