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승용디젤 엔진에서 JP-8 연료 적용 시 다단분사를 이용한 배기저감 방법 연구
이정우(Jeongwoo Lee),주상현(Sanghyun Chu),이정연(Jungyeon Lee),이승현(Seunghyun Lee),이윤우(Yoonwoo Lee),이성문(Sungmoon Lee),최회명(Hoimyung Choi),민경덕(Kyungdoug Min) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
As a statement of EURO-6 regulation, NOx emission should be reduced as a half of current standard from September, 2014. For the reduction of NOx emission, EGR is the most effective method due to thermal and diluted effects. However, since there is a trade-off relation between NOx and PM emissions, using heavy EGR rate stimulates the increment of PM emission. For this reason, many of Diesel engine have equipped DPF to eliminate PM emission, but it brings the deterioration of fuel consumption. JP-8 could be a good approach to reduce PM emission from Diesel engine. Since cetane number of JP-8 is lower than that of Diesel, ignition delay becomes prolonged. Also, premixed condition between air and fuels could be improved, because distillation temperature of JP-8 is lower than that of Diesel. These two characteristics effect on the reduction of PM emission. However, in previous researches, phenomenon of NOx increment was observed by JP-8 fueled combustion because of prolonged ignition delay. Thus, in this research, reduction of NOx and PM emissions simultaneously is studied by using multiple injection strategy constructing with pilot injections. The result shows low PM emission could be obtained while there is no penalties on NOx emission.