Sheet Breakup and Droplet Dynamics in Gasoline Spray of Multi-Hole Port Fuel Injector

Abstract

We have investigated a fuel spray from a multi-hole nozzle under gasoline port fuel injection conditions, the classification of the spray using dimensionless numbers in fluid dynamics is estimated to be in the wave like breakup region. In this study, shadowgraph photography was used to visualize the sheet breakup process of the gasoline spray. It was confirmed that the fuel formed a liquid sheet and broke up into droplets with a distribution along the axial distance from the nozzle. Also, the effects of the nozzle angle and differential injection pressure on the dynamic characteristics of fuel droplets were investigated by applying Particle Tracking Velocimetry (PTV) analysis. From these results, the direction and dispersion of droplets propagation are affected by the nozzle angle and differential pressure of injection.