리엔트런트형 연소실 형상이 디젤기관의 연소특성에 미치는 영향 -연소실 형상비(Bowl직경/Bowl깊이)의 효과-

Effect of Reentrant Type Bowl Geometry on Combustion Characteristics in Diesel Engine -Effect of Aspect Ratio(Bowl Diameter/Bowl Depth)-

Effect of reentrant type bowl geometry on combustion characteristics was investigated in a D.1.diesel engine. The main factor was the aspect ratio (Bowl Diameter/Bowl Depth) of bowl of combustion chamber, and the measured data include the cylinder pressure, engine performance and emissions of the engine using the 4 kinds of the combustion chamber. Experimental results indicate that the effect of dc/H and nozzle protrusion are relatively small and there exists an optimum dc/H according to the combustion conditions. It is also found that the smoke emission is quite sensitive the overall combustion time where the 90 percentage of the combustion heat is released. The smoke mission increases by shortening the 90% combustion time while it decreases by delaying the 90% combustion time.