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엄인용(Inyong Ohm),명차리(Chalee Myung) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
A PlV (Particle Image Yelocimetry) was applied to measure in-cylinder velocity field according to intake flow characteristics that were defined by steady flow bench. Two engines, one is conventional DOHC 4 valve and the other is high swirl lean combustion., were used to compare real swirl and tumble flow. Swirl and tumble ratios were also calculated from the velocity by momentum and energy method.<br/> The results show that the swirl flow patterns become more and more complicated as the measuring plane is far from the TDC and the tumble flow is more clearly observed under the one port deactivation condition. In high swirl condition, unexpected reverse tumble flow is observed during compression. The swirl ratio has higher value at BDC timing and the strength of tumble steadily decreases from the early stage of intake.