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이상준(S. J. Lee),강성희(S. H. Kang),미병렬(B. Y. Min) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.5
The ground effect on the aerodynamic characteristics of Maglev(Magnetic Levitation Train) model was investigated experimentally. Surface pressure distribution, drag and lift coefficients of the 1/30 scaled model were measured as functions of levitation height and free stream velocity. Also to investigate the wake structure behind the Maglev, hot-wire anomometer and flow visualization were used. In this study, Levitation heights were ranged h/H=0.011~0.21l and free stream velocities were varied from Uo= 10m/see to 25m/sec.<br/> The results show that the ground effect is dominant at small levitation height less than h/Hs:O. 053. For the small levitation height reverse flow occurs at rear end of the gap between Maglev and ground, resulting in lower surface pressure in that region. Drag coefficient CD has maximum value at h/H=0.032 and has local minimum at h/H=0.105. At h/H=0.032, velocity field measurements show a counter-rotation vortex pairs which descends with going downstream. But for the case of h/H=0.105, there is only one vortex located at center of the wake.<br/>