대형 디젤 엔진에서 분사기 형상이 저온 디젤 연소 및 배기 배출물에 미치는 영향

다국어 초록 (Multilingual Abstract)

The effect of injector configuration including the injection angle and number of nozzle holes on the low temperature combustion has been investigated in a heavy duty diesel engine. The low temperature combustion, which is achieved by a large amount of exhaust gas recirculation, has advantage of simultaneous reduction of soot and nitrogen oxides emissions because the combustion proceeds in the low temperature regime where neither soot nor nitrogen oxides produce. As exhaust gas recirculation rate was increased concentration of carbon dioxide was increased and decreased again because concentrations of unburned hydrocarbon and carbon monoxide from the incomplete combustion are relatively high at the higher exhaust gas recirculation rate. On the other hand concentration of oxygen at the intake and exhaust is decreased gradually. Low temperature diesel combustion is realized at the exhaust gas recirculation rate of 60% to reduce soot and nitrogen oxides simultaneously in present experiment. Indicated mean effective pressure of low temperature combustion corresponds to the 70% level of conventional diesel engine combustion. Reduction of hydrocarbon and carbon monoxide, which is produced in low temperature combustion because of the low combustion temperature and a deficit of oxygen, was achieved by using different injector configuration with 100° injection angle and 14 holes. Reductions in hydrocarbon and carbon monoxide are 35% and 26% respectively maintaining the similar indicated mean effective pressure of conventional injector configuration.