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박상봉(S.B.Park),이은현(E.H.Lee),유정열(J.Y.Yoo),이준식(J.S.Lee),최해천(H.Choi) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
To understand in-cylinder flow characteristics in a lean bum engine. flow experiments under steady conditions without a piston are carried out. Three-dimensional velocity fields at various valve lifts are measured using an LDV. Non-dimensional swirls for the standard and helical ports are obtained from the measured velocities and compared.<br/>
포트형상에 따른 정상상태 조건하에서의 희박엔진 연소실내의 유동특성
박상봉(S. B. Park),이은현(E. H. Lee),유정열(J. Y. Yoo),이준식(J. S. Lee),최해천(H. Choi) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.3
An experimental study has been conducted for the three-dimensional in-cylinder swirl flow under steady conditions. Velocity fields are measured by using an LDV at various valve lifts. Effects of geometry of inlet ports on swirl flows are investigated for standard and helical ports. Swirl distributions evaluated from velocity measurements are compared with those obtained from an impulse torque swirl meter. Results show that the helical port generates more intensive swirl than the standard one but it causes reduction in air flow coefficient. At the lower valve lift, no significant difference is observed in non-dimensional swirl values between two ports because of limited pre-swirl effect, while it becomes significant as the valve lift increases.<br/>