*Research Scholar, Department of Mechanical Engineering, University College of Engineering, Dindigul, Tamil Nadu, India
**Profesor, Department of Mechanical Engineering, University College of Engineering, Dindigul, Tamil Nadu, India
***Research Scholar, Department of Mechanical Engineering, University College of Engineering, Dindigul, Tamil Nadu, India
****Profesor, Department of Mechanical Engineering, University College of Engineering, Dindigul, Tamil Nadu, India
Online published on 14 February, 2017.
The paper is focused on analysing and evaluating the performance and characteristics of soya bean oil blended with straight diesel in naturally aspirated, direct injection compression ignition engine. The effect of variable piston geometry is also studied with deep and shallow toroidal pistons. Soya bean methyl esters was prepared through transesterification process of 450 ml soy oil with 2 grams of NaOH and 300 ml of methanol and 90% of fatty acid methyl ester was achieved.
The performance and emission investigation were studied using the blends of soya bean oil methyl esters with toroidal, shallow toroidal and deep toroidal pistons. The results showed that soya oil biodiesel has better performance characteristics with shallow toroidal piston geometry. The performance characteristic shows increase in brake thermal efficiency with marginal increasing specific fuel consumption. Emission analysis also supports the performance parameters by reduced HC and CO emissions at high loads and increased NOx emissions at all loads with blend ratios. The CO, HC emissions were comparable (or) lesser than diesel fuel. The soya bean methyl ester blends released more NOx than diesel. This is because the oxygen content in soya oil methyl esters increased the combustion temperature.
soya oil methyl esters, piston geometry, brake thermal efficiency, combustion temperature, biodiesel, compression ignition engine
