Comparative study of macroscopic spray parameters and fuel atomization behaviour of SVO (Jatropha), its biodiesel and blends

Thermal Science

关键词: Jatropha oil;    spray characterization;    spray tip penetration;    spray cone angle;    spray area;    fuel atomization;   

DOI  :  10.2298/TSCI120306109A

来源: DOAJ

【 摘 要 】

The combustion and emission characteristics of vegetable oils and derivativesare quite different from mineral diesel due to their relatively highviscosity, density and vaporisation characteristics. These properties affectthe fuel spray and the interaction of the spray with air in the combustionchamber 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 veryefficient to analyse the comparative spray parameters for these fuels.Present research investigates the effect of chamber pressure on spraycharacteristics of Jatropha SVO (J100)/ blends (J5, J20), and Jatrophabiodiesel (JB100)/ blends (JB5, JB20) vis-a-vis baseline data of mineraldiesel. Experiments were performed for all these fuels/ blends injected in aconstant volume spray visualisation chamber (cold chamber) at four differentchamber pressure (1, 4, 7 and 9 bar respectively). It was found that J100 andJB100 have the highest spray tip penetration, cone angle and the spray areafollowed by J20, J5, mineral diesel and JB20, JB5, mineral dieselrespectively however J20, J5 and JB20, JB5 have better atomizationcharacteristics as compared to J100 and JB100 respectively. Cone angle washigher for biodiesel blends as compared to SVO blends at atmospheric pressurehowever as the chamber pressure was increased to 9 bars, it became almostequal for both fuel types. Spray parameters are found to be excellent formineral diesel followed by Jatropha biodiesel and Jatropha oil. It was foundthat atomization of fuel becomes superior with increasing chamber pressure.

【 授权许可】

Unknown