Investigation on aerodynamic drag of Korean high speed train (HEMU-430X) due to roof apparatus for electrical device

摘要

To explore the need for a roof apparatus for an electrical device, such as a pantograph cover or additional cover, the total aerodynamic drag of HEMU-430X, which is a high-speed train developed in South Korea with a maximum speed of more than 400 km/h, was experimentally analyzed using wind-tunnel testing. Experimental models were selected to a 1/20-scale, 5-car HEMU-430X model and three types of pantograph covers (A streamlined type and two wedge types), along with an additional cover. The experimental Reynolds numbers were 370000-620000. The aerodynamic drag of each car was simultaneously measured using load cells. First, the aerodynamic drag of each car without any roof apparatus was analyzed as the baseline model. Second, according to the variations in the three types of pantograph cover configurations, the aerodynamic drag of each car with pantograph covers was compared with the aerodynamic drag of the basic model. Third, the aerodynamic drag of each car with a pantograph cover and additional cover was compared with the results of the baseline model and baseline model with the pantograph cover. Finally, the aerodynamic drag due to the roof apparatus for an electrical device was investigated and analyzed.