Analysis of a Fuel Liquid Film Thickness of a Port Fuel Injector Spray after Wall-impingement

Abstract

The authors have developed a new measuring method of the liquid film thickness on a wall using laser-induced fluorescence. With this method, temporal variations of fuel film are obtained. Using this method and high-speed video camera, behaviors of fuel film formed by impinging fuel spray against the wall were observed. Effects of injection quantity, distance against the wall, impinging angle and wall temperature on the film behaviors were also investigated. Fuel film was thicker at the tip of the film. This tendency declined as impinging distance increased. Wall temperature had low impact during spray hitting.