Combustion, performance and emission characteristics of karanja blended biodiesel in CI engine: effect of CR

This research presents the Karanja biodiesel blends as fuel in a direct injection diesel engine. Combustion, performance and emission characteristics were carried out on a single cylinder with water cooled by four stroke diesel engine coupled with multigas analyzer. The suitability of biodiesel blends for combustion analysis were done by using fuel characterisation. Fuel properties such as density, calorific value kinematic viscosity, flash and fire points of the blends were evaluated according to ASTM standards. Based on fuel properties, Karanja biodiesel blends B20, B40 and B60 were selected for the study along with diesel fuel at different compression ratios 14, 16 and 18. From the observation, it shows that at 42% load, 1500rpm engine speed and CR-18, Karanja blended biodiesel B60 indicated shorter ignition delay, maximum cylinder pressure (P_max), higher CHRR, higher BTE and reduced CO, HC emissions compared with the diesel fuel. (paper)