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철도차량 통과 시 터널 내부 유동장 해석을 위한 무격자기법의 적용에 관한 연구
이웅현(W.H. Lee),이상돈(S.D. Lee),신재렬(J.R. Shin) 한국전산유체공학회 2018 한국전산유체공학회지 Vol.23 No.4
We developed a computational fluid analysis program that can perform flow analysis when a high - speed railway vehicle passes through a tunnel by applying meshless computational technology in this study. The program was verified by comparing transonic RAE 2822 airfoil with experimental measurement results and numerical analysis results. From the proven analytical techniques, we propose the behavior of the high - speed trains moving into the tunnel by using the meshless - based computational fluid technique as a dedicated analysis tool that can be easily used even by the novice users. We compared the pressure generated during the passage of a high-speed train using this analysis technique with the results of C-STA<SUP>TM</SUP>, which is a conventional program for high-speed train design. In the case of the tunnel without shaft tunnel, it shows the same result as the existing C-STA<SUP>TM</SUP> and the result of this development program, showing the possibility of using this program using the meshless technique as a dedicated program for railway vehicles.
압축기 적용 고속열차의 터널 통과 시 공기력 저감 효과 연구
박희범(H.B. Park),김영매(Y.M. Jin),권혁빈(H.B. Kwon),이웅현(W.H. Lee) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.1
A series of CFD simulation have been conducted to evaluate the effect of the Hyperloop-type compressor adapted to a high-speed train to reduce the aerodynamic drag, the pressure transient and the micro-pressure during tunnel passage. Unsteady axi-symmetric Navier-Stokes equation has been employed to calculate the unsteady flow field induced by the KTX-Shancheon train through the Honam high-speed line tunnel. By comparing the calculation results with and without compressor, the effect of compressor to the reduction of tunnel transient forces has been analyzed. It is concluded that the adaption of compressor of 30% inlet area relative to the train cross-sectional area reduces the mean aerodynamic drag to 15.9%, the pressure change in the cabin up to 24.9%, and the micro-pressure wave to 40.3%.