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양희천(H.C.Yang),유정열(J.Y.Yoo),이준식(J.S.Lee),최해천(H.Choi) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
In this paper three-dimensional external airflow around road vehicle models was numerically studied to investigate the aerodynamic characteristics. FVM based on a general curvilinear coordinate system was used to solve the governing equations. The drag coefficients by the calculation were about 40-50% higher than the experimental values.<br/>
양희천(H. C. Yang),이준식(J. S. Lee),유정열(J. Y. Yoo),최해천(H. C. Choi) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.6
Turbulent flow characteristics of a lean-burn engine were qualitatively studied in order to obtain the optimum design parameters. 3-D lean-burn model engine was made up of an intake port, an intake valve and a cylinder. Computational grids were generated using PATRAN which was a FEM grid-generation software and numerical calculations were performed using STAR-CD. The predicted results showed that swirl and tumble structures were significantly changed by the valve lifts.
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/>