TY - JOUR
TI - Comparative study of macroscopic spray parameters and fuel atomization behaviour of SVO (Jatropha), its biodiesel and blends
AU - Agarwal Avinash Kumar
AU - Chaudhury Vipul
AU - Agarwal Anuj
AU - Shukla Pravesh C
JN - Thermal Science
PY - 2013
VL - 17
IS - 1
SP - 217
EP - 232
PT - Article
AB - The combustion and emission characteristics of vegetable oils and derivatives  are quite different from mineral diesel due to their relatively high  viscosity, density and vaporisation characteristics. These properties affect  the fuel spray and the interaction of the spray with air in the combustion  chamber therefore it is important to analyze the spray characteristics e.g.  spray tip penetration, spray cone angle, spray area and fuel atomization.  Optical techniques for spray visualization and image processing are very  efficient to analyse the comparative spray parameters for these fuels.  Present research investigates the effect of chamber pressure on spray  characteristics of Jatropha SVO (J100)/ blends (J5, J20), and Jatropha  biodiesel (JB100)/ blends (JB5, JB20) vis-a-vis baseline data of mineral  diesel. Experiments were performed for all these fuels/ blends injected in a  constant volume spray visualisation chamber (cold chamber) at four different  chamber pressure (1, 4, 7 and 9 bar respectively). It was found that J100 and  JB100 have the highest spray tip penetration, cone angle and the spray area  followed by J20, J5, mineral diesel and JB20, JB5, mineral diesel  respectively however J20, J5 and JB20, JB5 have better atomization  characteristics as compared to J100 and JB100 respectively. Cone angle was  higher for biodiesel blends as compared to SVO blends at atmospheric pressure  however as the chamber pressure was increased to 9 bars, it became almost  equal for both fuel types. Spray parameters are found to be excellent for  mineral diesel followed by Jatropha biodiesel and Jatropha oil. It was found  that atomization of fuel becomes superior with increasing chamber pressure.