Performance analysis of dual biodiesels of pongamia and cotton seed oils and numerical analysis of BTE and BSFC

Abstract

Blending diesel with vegetable oils has gained tremendous scope for conventional energy recourses in automobiles. There has been lot of work done on biodiesel and is still a topic of interest among scientific community in alternative fuels. Very few works have been reported with the mixing of two different biodiesel blends with diesel and leaves a lot of scope in this area. This paper deals the experimental and numerical analysis of dual bio diesel. Experiments were conducted with mineral diesel and bio diesel blends of pongamia oil and cotton seed oil at different blending ratios (B10 = 10% of biodiesel, B20 = 20% biodiesel, B30 = 30%) on a single cylinder VCR diesel engine. The performance of dual biodiesel blends were investigated in terms of break power vs break thermal efficiency and break specific fuel consumption. The brake thermal efficiency of blends B10, B20 and B30 were found higher than diesel, and brake specific fuel consumption of all the bio diesels are lower than mineral diesel. An attempt was made to create a mathematical model of BTE vs. engine torque and engine speed; and BSFC vs. engine torque and speed by the means of regression analysis using the observed data for studying the effect of the fuel heating value and the brake thermal efficiency (BTE). The developed mathematical model closely correlates with experimental observations. We conclude that designed BTE and BSFC contour’s gives a range of torque and speed of VCR diesel engine on which it can be operated effectively.