커먼레일식 직분식 가시화 디젤엔진의 파일럿 분사 연소 및 Soot 분포 특성에 관한 연구

A Study on the Combustion Characteristic and Soot Distribution of a Common Rail Type D.I.Diesel Visualized Engine with Pilot Injection

The objective of this work is to investigate the effect of swirl, injection pressure and pilot injection on D.I.Diesel combustion by using a transparent engine system. The test engine is equipped with common rail injection system to obtain high pressure and to control injection timing and duration. In this study, the combustion analysis and steady flow test were conducted to estimate the heat release rate from in-cylinder pressure and pilot injection was investigated by using LII technique. As the results, high injection pressure was found to shorten ignition delay as well as enhance peak pressure and heat release rate was greatly affected by injection timing and pilot injection. In addition, the results showed that the period of soot formation corresponded to the diffusion flame.