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RI-CNG 엔진에서 연료 분사시기 및 공기과잉률에 따른 연소특성의 고찰
하동흔(D. H. Ha),진종무(J. M. Jin),료춘명(C. M. Liao),정성식(S. S. Chung) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Various measures have been tried to reduce the NOx emission from diesel engine, but with partial success because the mechanisms of NOx and PM formations appear to have trade-off relation between each other. Therefore it has been known to be difficult to reduce NOx emission and PM emission simultaneously. Two stage combustion method i.e. a combustion process which has rich combustion stage and lean combustion stage one by one, has been developed successfully to reduce NOx formation in the continuous combustion chambers such as in the boilers. But until yet it is not successful to apply the same method in intermittent combustion chamber like in the diesel engine cylinder, as it was, only several research works were carried out. In this study, devised was a uniquely shaped combustion chamber with reformed piston crown intended to keep fuel-rich condition during early stage of combustion and fuel-lean condition during next stage. It was found that the NOx emission decreased significantly at various conditions of operation with the two stage combustion type engines of PR20 type, but other values such as smoke, CO and specific fuel consumption deteriorated as usual.
The Oxidation of Methane at HCCI Engine Combustions
C. M. Liao(류춘명),J. M. Jin(진종무),D. H. Ha(하동흔),J. K. Yeom(염정국) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
압축천연가스(CNG)의 주요성분인 메탄의 산화와 연소를 HCCI엔진조건하에서 컴퓨터 시뮬레이션으로 연구하였다. 먼저, 당량비를 0.2에서 0.45까지 변화시켜 얻은 압력과 온도효과를 CHEMKIN을 사용하여 계산하였다. 그리고, 메탄의 운동학적 특성을 당량비 Ф=0.3, GRI 3.0 방법을 사용하여 계산하였다. 반응물과 생성물의 반응과정과 매개물의 프로파일은 운동학적 모델을 사용하였다. 마지막으로, 메탄의 산화반응의 주요 반응경로를 확인하기 위해 완전반응유동해석을 사용하였다.