An Experimental Study on the Correlation between Spray Dispersion Area and Tip Penetration Using an Edge Detection Technique of Images Captured from Highly Pressurized Cr-Di Fuel Injection

Abstract

A correlation between the spray tip penetration and dispersion area was investigated. Images of diesel fuel sprays from high-pressure common rail injectorwere analyzed using an edge-detecting technique. Diesel fuel sprays were injected into a pressurized spray chamber. The gas density in the spray chamber was 17.97kg/m3, which is representative of the density in a typical diesel engine when the fuel injection process starts. Consecutive images of the diesel spray were captured with a high-speed digital camera. The spray tip penetration and dispersion area according to the time when the fuel injectionprocess starts was determined. The spray dispersion area increased linearlywith the time after the fuel injection process starts.The slope of the linear correlation line between the spray dispersion area and time after start of fuel injection was steeper when the fuel injection pressure was higher. There was little effect on the slope of the linear correlation line with a change of the duration of the fuel injection time. Also, the spray dispersion area increased parabollically with the spraytip penetration.