http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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%.
전산유체역학을 이용한 지하터널을 주행하는 다수 차량의 공기저항에 관한 연구
김부선(B.S. Kim),박희범(H.B. Park),김영매(Y.M. Jin),권혁빈(H.B. Kwon) 한국전산유체공학회 2019 한국전산유체공학회지 Vol.24 No.1
In order to analyze effects of various parameters on aerodynamic drag of an underground freight system and to suggest a plan for reducing aerodynamic drag, a three-dimensional simulation using computational fluid dynamics has been made and aerodynamic drags respectively for a single vehicle running and a platooning in which a group of two or more aligned vehicles run have been calculated. A concept design of an underground freight system has been made to obtain two concept designs, i.e., a pallet-exclusive transportation design and a vehicle-compatible transportation design. ANSYS FluentTM has been used for modeling, meshing and numerical analysis for respective designs. It can be known from the analysis that aerodynamic drag significantly increases in an underground tube compared to an open space and the amount of an increase of aerodynamic drag is considerably affected by the sectional area ratio between the tube and the capsule. In addition, the aerodynamic drag in the platooning is reduced by up to 10% compared to the single running depending on the number of the capsules and the distance between the capsules.