DefinePK

Abstract

Efficiency of combustions engine is highly dependent on the formation of the air-fuel mixture prior to ignition. Both the homogeneity of the combustion process and the ignition process are largely dependent on the mixture properties. This study focuses on determining the spray characteristics of biodiesel blend in rapid compressions machine (RCM) by using simulation of ANSYS version 15.0 Fluent. The parameters investigated including spray angle, spray penetration, spray velocity, size diameter of particle, formations of spray, turbulence kinetics energy and spray area. The simulation was performed on three types of biodiesel blend which are B5, B10 and B15 at different ambient pressure and ambient density. Result shows that when in high ambient pressure, the spray of biodiesel angle decreased. The results also indicated that, the spray penetration length and spray area decreased with the increasing in the ambient density. The spray velocity also decreases as the ambient density increases. This study concludes that the ambient pressure and density strongly affected the characteristics of fuel spray.