Visualization of Diesel Combustion with High Pressure Fuel Injection by Laser Shadow graph Technique

Abstract

The high pressure fuel injection is very effective for improving NOx and particulate emission from diesel engine. To understand the mechanism of combustion improvement, the observation of combustion phenomena was performed using high speed laser shadowgraph technique. The results indicate that ignition and flame development process is different from base engine in the case of high pressure fuel injection. It becomes clear that combustion is improved by increasing entrained air into spray, rapid mixing between fuel and air.