INVESTIGATION AND COMPUTATIONAL ANALYSIS OF DIVERGENT ORIFICE IN FUEL INJECTOR NOZZLE

Sachin Prabhakar Badgujar, P. L. Sarode, S. V. Yeole, P. S. Patil

Abstract: Diesel engine performance and emissions are strongly influenced with fuel atomization and spray processes. Atomization of fuel is very important part in controlling combustion inside a direct injection engine. Good atomization which ultimately decreases the exhaust emissions. Atomization is first occurs in the vicinity of the orifice due to turbulence and cavitations. Nozzle parameter such as orifice geometry is helpful to increase cavitations. The work investigates coefficient of discharge considering different orifice geometries using CFD analysis. The result shows the importance of K-factor for design of orifice geometries which ultimately useful to understand the value of discharge coefficient. For negative K value the discharge coefficient increases but it significantly decrease the axial velocity..

Keywords: CFD Analysis, Cavitation, Diesel injector, Discharge coefficient, Atomization etc…

DOI: https://doi.org/10.15623/ijret.2014.0320002