Shiraz University Iranian Journal of Science and Technology Transactions of Mechanical Engineering 2228-6187 39 M2 2015 10 01 STUDY OF SPRAY CHARACTERISTICS OF BIODIESEL USING DIMENSIONLESS ANALYSIS UNDER NON EVAPORATING CONDITIONS 389 398 3247 10.22099/ijstm.2015.3247 EN P. Raghu Sri Venkateswara College of Engineering, Post Bag No. 1, Irrungattukottai, Pennalur - 602 117, Tamil Nadu, India N. Nallusamy SSN College of Engineering, OMR, Kalavakkam - 603 110, Tamil Nadu, India Journal Article 2014 05 11 The spray characteristics of the fuel greatly influence emissions from diesel engines. Spray development plays a vital role in improving the combustion and emission characteristics of fuel because it directly affects the air- fuel mixture formation. The spray characteristics of fuel mainly depend on fuel injection process, fuel density, fuel viscosity, ambient pressure and temperature. Among these, the effect of fuel injection pressure is a very important parameter directly affecting spray structure. This study investigates the effects of fuel injection pressure on the spray characteristics such as spray angle and spray tip penetration in a constant volume chamber under non evaporating conditions by image processing techniques. The macroscopic spray characteristics were quantified using dimensionless analysis by examining the role of the dominating forces associated with liquid jet breakup. The Weber number, Reynolds number and air- to- fluid density ratio were used to capture the primary forces including the inertia, surface tension and aerodynamics drag forces. The Weber number has a more profound effect on the spray penetration and spray cone angle compared to the Reynolds number contribution. This analysis yielded dimensionless correlations for spray cone angle and spray tip penetration that provided important insight into the spray breakup and atomization process. https://ijstm.shirazu.ac.ir/article_3247_dcdfec03bb5b46ef874e0c94516cd561.pdf