The effects of intake system on turbulent kinetic energy for the in-cylinder flow of a four-valve SI engine were studied. For this study, the same head, cylinder, and the piston were used to examine turbulence characteristics in two different intake systems. In-cylinder flow measurements were conducted using three dimensional LDV system. The measurement method, which simultaneously collects 3-D velocity data, allowed a evaluation of turbulent kinetic energy inside a cylinder. High levels of turbulent kinetic energy were found in regions of high shear flow, attributed to the collisions of intake flows. These specific results support the more general conclusion that the slightly offset direction of the intake system produced higher in-cylinder velocities on the +x-axis side of the cylinder which caused some asymmetric flow patterns about the z-axis. Higher levels of turbulent kinetic energy prevailed in zones of mean velocity collisions and regions where significant directional changes in the mean velocity patterns occurred.

덕트에 설치되는 오리피스는 압력과 유량 제어용으로 많이 활용되고 있다. 선박의 거주 구역에 통풍 덕트는 환기와 배기를 위해 설치되며 및 선박의 설계 및 건조 후 검사는 공기 유속과 유량 그리고 소음 기준에 대해 수행된다. 이 연구에서는 선박의 선실 별 유량분배에 중요한 요소인 T-분지관을 대상 으로 오리피스를 적용한 경우 난류운동에너지 분포를 고찰하였다.