Domestic Journal


Title오희창, 이민석, 박정서, 배충식, “성층희박연소 운전조건에서 분사시기에 따른 분무유도식 직접분사 가솔린엔진의 분무 및 화염특성”, 대한기계학회 논문집 B권, 제 37권, 제 3호, pp221-228, 2013. 3

오희창, 이민석, 박정서, 배충식, “성층희박연소 운전조건에서 분사시기에 따른 분무유도식 직접분사 가솔린엔진의 분무 및 화염특성”, 대한기계학회 논문집 B권, 제 37권, 제 3호, pp221-228, 2013. 3

Abstract

An experimental study was carried out to investigate the effects of the injection timing on the spray and combustion characteristics in a spray-guided direct-injection spark-ignition (DISI) engine under lean stratified operation. An in-cylinder pressure analysis, exhaust emissions measurement, and visualization of the spray and combustion were employed in this study. The combustion in a stratified DISI engine was found to have both lean premixed and diffusion controlled flame combustion characteristics. The injection timing condition corresponding to the stratified mixture characteristics was verified to be a dominant factor for these flame characteristics. For the early injection timing, a non-luminous blue flame and low combustion efficiency were observed as a result of the lean homogeneous mixture formation. On the other hand, a luminous sooting flame was shown at the late injection timing because of an under-mixed mixture formation. In addition, the smoke emission and incomplete combustion products were increased at the late injection timing as a result of the increased locally rich area. On the other hand, the NOx emissions decreased and IMEP increased as the injection timing retarded. The combustion phasing produced by the injection timing was verified as the reason for this observation.

Previous박철웅, 김성대, 김홍석, 오희창, 배충식 “초희박 GDI엔진에서 다단점화에 의한 연소 및 배기특성,” 한국자동차공학회 논문집, vol. 20, No3, pp106-112, 2012. 5
Next전지연, 배충식, “DME 분사시기 조절을 통한 수소-DME 부분 예혼합 압축착화 연소 제어”, 한국연소학회지, vol. 38, No. 1, pp27-33, 2013. 3
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