Unsteady Aerodynamic Characteristics of High-speed Pantograph

The current collection performance of pantograph is critical to safe operation of high-speed trains.The unsteady aerodynamic characteristics of pantograph influence the status of current collection of the pantograph system severely.In this paper,unsteady aerodynamic characteristics of high-speed train pantograph were studied with detached eddy simulation(DES).The research results indicate as follows: The aerodynamic lift coefficient of pantograph was strongly affected by the strength and shedding frequency of the detached eddy;when without the cross wind,the lift of pantograph is negative,and when the train runs at the speed of 350 km/h,the fluctuating amplitude of the lift is 110%,and the fluctuating amplitude and frequency of pantograph increases with further speed raising and the side force applied on the pantograph remains very small;when with the cross wind,the vibration frequency of the pantograph lift differs from that in absence of the cross wind greatly whereas the lift coefficient changes little,and the side force applied on the pantograph increases as the cross wind speed increases.The results are helpful to optimized design of high-speed pantographs.