Host: The Japan Society of Mechanical Engineers
Name : The Ninth International Conference on Modeling and Diagnostics for Advanced Engine Systems (COMODIA 2017)
Date : July 25, 2017 - July 28, 2017
In recent years, fuel injection pressure tends to be higher as compared with the conventional direct injection gasoline engine in order to promote the atomization of the spray. Injection pressure of the fuel is related to atomization process of the fuel, and the atomization of the fuel affects the mixture formation between the fuel and air. Therefore, in order to improve the efficiency of the engine, it is important to investigate the flow characteristics of the spray during compression stroke of the engines. In this study, effects of injection pressure and injection timing on flow characteristics of the gasoline spray near the nozzle exit injected in the chamber of rapid compression expansion machine (RCEM) during compression stroke were investigated. Velocity fields of the spray was measured by time-resolved PIV by using the ultra-high speed camera and the CW laser. In order to investigate the influence on the disturbance of the spray by the compression stroke, the turbulent energy was obtained. As results, normalized axial velocity distribution of the spray in radial direction showed good agreement with that of a single phase jet. However, there was a difference of normalized turbulent intensity between the spray and single phase jet.
