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양종필(Jong-Pil Yang),이영배(Young-Bae Lee),이다한(Da-Han Lee),박종배(Jong-Bae Park) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.11
전기버스 급속충전용 팬터그래프 충전시스템 개발을 위해 IEC 61851-23, SAE J3105, OPPCharge와 같은 기존의 단체 및 국제표준들의 차이점을 분석하여 여러 방면에서의 공통점과 차이점을 비교연구한다.
균일류의 회전원주 제어에 의한 유동 및 공력 제어효과에 관한 연구
부정숙,양종필,김창수,신영곤,Bu, Jeong-Suk,Yang, Jong-Pil,Kim, Chang-Su,Sin, Yeong-Gon 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.3
The aerodynamic forces and wake structure of the non-rotating downstream circular cylinder, of which the uniform freestream flow is interfered with another spinning upstream cylinder having the same diameter that is located upstream in a line have been investigated experimentally. When the spin rate of the downstream cylinder defined as the ratio of tangential surface velocity of the spinning cylinder to the freestream velocity increases gradually from zero to 1.4, the change of surface pressure distribution, aerodynamic forces of the non-rotating downstream cylinder were measured in case of several distance ratios of 1.5, 3.0, and 4.5 defined as the ratio of distance between the centers of two cylinders to the diameter. The wake flow patterns behind the cylinder were also investigated in each case. From the present experiments, it has been found that the spin rate significantly influences the aerodynamic forces and near-wake flow phenomena of the downstream cylinder in such a way that the drag increases as the spin rate and distance ratio increase and the wake width increases as the distance ratio increases.