Numerical analysis of the under-body flow field of a train and Study of Heighter-effect for prevention of ballast -flying

자갈비산 방지를 위한 하부유동장 해석 및 Heighter 설치의 타당성 검토

The Korean high speed train runs at 300 km/h, ballast-flying phenomenon often happens by strong train-wind. It is important to consider the prevention of ballast-flying phenomenon, because the train under-body and fares or walker around a track might be damaged. In this study, Numerical analysis of the under-body flow field of a train and study of heighter-effect were conducted to decrease the speed of under-body. The shape of under-body was simplified for convenience of meshing and analysis. According to results of Taguchi's design by orthogonal arrays, a height of tie is dominant in the flow field, so if the heighter is installed on tie, the speed of under-body might be decreased. To apply the result of this study is useful to build a new high-speed-line might be expected.