직분식 디젤엔진에서 CAVITY 형상에 따른 Soot의 농도와 운전조건과의 관계 연구

The Relationship between Soot Concentration and Operating Condition regarding Cavity Shapes in a D. I. Diesel Engine

The local instantaneous flame temperature and soot concentration in a D. I. diesel engine were measured using a two-color method. The proposed method based on the continuous spectra! radiation from the soot particles in the flame is applicable to industrial Diesel engines without major modifications of their main characteristics because of simplicity and relative ease of application. Measurements were performed at two locations inside the combustion chamber of a D. I. diesel engine. Effects of different engine speeds and loads, fuel injection timings, combustion chamber shapes on flame temperature and KL factor, which is qualitatively proportional to soot concentrations, were examined. Flame temperature change were observed with increasing engine speed and load. The higher the flame temperature is, the lower the KL factor is.