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논문 기본 정보

자료유형
학술대회자료
저자정보
오희창 (한국과학기술원) 이민석 (한국과학기술원) 박정서 (한국과학기술원) 배충식 (한국과학기술원)
저널정보
한국자동차공학회 한국자동차공학회 춘계학술대회 2011 한국자동차공학회 부분종합 학술대회
발행연도
2011.5
수록면
54 - 62 (9page)

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In this study, the single cylinder engine experiment was carried out to investigate the effect of multiple injections on stratified combustion characteristics in a spray guided direct injection spark ignition engine. In the result of engine experiment with the single injection, indicated mean effective pressure was increased as injection timing was retarded to top dead center due to the increased effective work. However, the retardation of the injection timing was limited by the misfire occurrence resulted from the locally rich mixture generation under the high ambient pressure. Moreover, at the injection timing where the maximum IMEP was shown, HC and smoke emissions were increased due to the locally rich area of the stratified mixture. The multiple injection strategy was applied to enhance the local homogeneity of the stratified mixture. In the result of engine experiment with the double injection, IMEP and combustion efficiency were increased. As an index of combustion instability, COV of IMEP was decreased significantly with the double injection. This result implies that the local homogeneity of the stratified mixture was enhanced by the double injection. HC and CO emissions were decreased significantly with the double injection due to the enhanced local homogeneity of the stratified mixture. NOx emissions were increased due to the increased in-cylinder temperature resulted by more activated combustion. With the triple injection, the flammable injection timing window became narrower. Furthermore, IMEP and combustion efficiency were decreased. This is likely because the stratified mixture was formed on the upper position of the spark plug due to then shortened spray penetration.

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Abstract
1. 서론
2. 실험 장치 및 조건
3. 실험 결과 및 토의
4. 결론
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UCI(KEPA) : I410-ECN-0101-2013-556-001353488