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[가솔린엔진] 흡기 유동 조건의 변화가 실린더 내 가스 유동 패턴에 미치는 영향
이창식(C.S. Lee),전문수(M.S. Chon),김우경(W.K. Kim),최수천(S.C. Choi) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents the characteristics of the gas flow in the engine cylinder under various intake flow conditions. The single-ㄹrame particle tracking velocimetry(PTV) was applied to analyze the gas flow pattern and flow field in the cylinder. Effects of tumble intensifying valve(TIV), swirl intensifying valve(SIV), and one-valve deactivated condition on in-cylinder flow patterns were compared with the baseline engine under 600rpm motoring condition. In addition, tumble ratio was estimated with results of in-cylinder flow fields. Base on experimental results, the tumble ratio of in-cylinder flow field has the maximum value at the bottom dead center for the different four inlet conditions. In TIV condition, the tumble ratio is 1.35 times larger than that of baseline engine and I intake valve deactivated condition is effective to improve in-cylinder swirl motion