Influence of leading-edge angle of subgrade on aerodynamic loads of high-speed train in wind tunnel

Abstract The purpose of this study is to establish the correlation between boundary layer over subgrade and aerodynamic loads acting on train model in conventional wind tunnel tests. Firstly, flow characteristics around with different leading-edge angles (15◦, 30◦, 45◦) are investigated through PIV experimental test method. Then, tests performance a high-speed carried out. results compared previous data obtained by moving Results show that, due presence layer, pressure lower part head decreases, while other location not significantly affected. This reason for reduction drag lift train. In addition, effects become more obviously when thickness increasing. could serve as calibration forces trains.