파일럿 분사시의 커먼레일식 직분식 가시화 디젤엔진의 연소 및 Soot분포 특성에 관한 연구

Abstract

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 hi^i pressure and control injection timing and duratioa In this study, the combustion analysis and steady flow test were conducted to measure the heat release rate from in-cylinder pressure. Soot distribution in difiusion flame according to swirl ratio, injection pressure and pilot injection was investigated by using LU 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 difiusion flame