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소형 디젤 엔진의 연소실 및 인젝터 노즐 형상에 따른 연비 및 배기 특성
강승우 ( Seungwoo Kang ),홍동우 ( Dongwoo Hong ),배충식 ( Choongsik Bae ) 한국액체미립화학회 2018 한국액체미립화학회 학술강연회 논문집 Vol.2018 No.-
The penetrations of the sprays from the injectors were increased with adoption of high pressure injection system in a light-duty diesel engine. Because the combustion chamber of a light-duty diesel engine is smaller than the heavy-duty, the interaction between spray and combustion chamber is much important in a light-duty diesel engine. The combustion process and the position at which the combustion occurs vary depending on the combustion chamber geometry and spray. Also, in the case of a small diesel engine, the ratio of the heat loss caused by combustion to the piston and the liner is large. It is therefore important to improve combustion and reduce heat loss through optimization of injector nozzles and combustion chamber geometry of small diesel engines. In this study, fuel efficiency and exhaust characteristics of a small diesel engine according to the shape of injector nozzle were examined in two types of combustion chambers. The effect of the nozzle diameter and the number of holes was studied. The nozzle diameter was 100um to 117um and the number of nozzles was in the range of 8 to 12. The shape of the re-entrance combustion chamber tends to improve the fuel efficiency and exhaust gas when the nozzle diameter is larger and the number of holes is increased. This is because the air utilization in the combustion chamber increased when the momentum of the spray was larger. However, when the nozzle diameter increases beyond a certain nozzle diameter, the penetration distance of the liquid spray becomes longer, so that the wetting of the liquid spray occurs and the particulate matter emission increased. On the other hand, in the case where the depth of the combustion chamber shape is deep and making the spray using the air toward the edge of the combustion chamber, the fuel consumption and exhaust are deteriorated when the nozzle diameter is large and the number of holes is increased,. Compared to the combustion chamber shape in which the spray is re-entrant to the center of the combustion chamber, the larger the spray momentum did not help to improve the air utilization rate, and the microscopic mixing of the air and the fuel due to improved atomization of the spray improved the combustion and exhaust. In this experiment the formation of the injector nozzle and spray required for each combustion chamber shape in the case of the small diesel engine is changed. Therefore, it was concluded that optimization of injector shape, injection strategy and optimization of combustion chamber shape should be performed at the same time.