Numerical Simulation On Fluid-solid Coupling Characteristics Around The Pantograph Of High-speed Train Entering Tunnel

With the continuous increasing of high-speed train operation speed,it is more obvious that the impact of strong airflow on the Pantograph-catenary systerm,and the contact force of the Pantograph-catenary system is significantly affected by the impact of aerodynamic loads.There is flow-induced vibration phenomenon appeared by the effect of strong airflow on the pantograph,which makes the flexible deformation of the upper arm,the lower arm,the chassis and the collector head system of the pantograph and the fatigue damage to the part of pantograph.Particularly as the limitation of the wall,compared with the open space,the aerodynamic load of the pantograph is greatly increased when a train entering a tunnel,so the aerodynamic performance and stability of interaction of Pantograph-catenary have deteriorated.Therefore it is significant to study on the aerodynamic parameters and fluid-solid coupling parameters of the pantograph when a high-speed train enters a tunnel and runs in the open air stably.At first this paper used CFD software STAR-CCM+ with the computational fluid dynamics module,solid mechanical module,fluid-solid coupling(FSI)module which inside.Then based on the real model of the one of China high-speed train model and CX-PG high-speed pantograph on it.The finite element mesh partitioning strategy of the finite volume method and the FEM tetrahedral mesh partitioning strategy of the pantograph solid mechanical model were used to mesh the high-speed train into the tunnel region respectively.Then the research on the the distribution characteristics of the flow field and the aerodynamic parameters of high-speed train and pantograph,and the fluid-solid coupling parameters of the pantograph by the numerical simulation of two conditions when the high-speed train entered a tunnel and the high-speed train run in the open air stably.In the simulation of the high-speed train entered the tunnel,the overset grid method was used.The rationality and correctness of the region calculation flow field in the course of the high-speed train are verified by compare with the experimental data of the CRH2-150 C high-speed train through the Fenghuangtai Tunnel.Afterwards through the numerical simulation study of three-dimensional compressible unsteady turbulent flow in the process of the high-speed train entering the tunnel with speed of 350km/h,the pressure distribution around the high-speed train and the train surface,the pressure wave parameters of the typical measuring points in the tunnel are analyzed,and the pressure wave characteristic of typical measuring point of high speed train body,pressure wave characteristics of typical test point of pantograph,aerodynamic drag force of the pantograph and aerodynamic lift force of pantograph,variation characteristic of pantograph stress force with time,variation of pantograph deformation with time.The aerodynamic parameters and stress and deformation of fluid-solid coupling parameters of a high speed high-speed train entering the tunnel were given.And finally analyzes the influence characteristics of the train speed during the train entring the tunnel.Afterwards through the numerical simulation study of three-dimensional incompressible steady turbulent flow in the the high-speed train run in the open air stably with speed of 350km/h,the paper analyzed the flow field in open space and the pressure distribution of the train surface when the train run in the open air stably.Aerodynamic parameters of high speed train,such as aerodynamic drag force,aerodynamic lift force of the pantograph,the stress of pantograph and the deformation of pantograph were researched.The parameters of aerodynamic parameters and fluid-solid coupling parameters as stress and deformation of the pantograph were given.And finally analyzes the influence characteristics of the train speed during the train run in the open air.Eventually this paper reveals the aerodynamic parameters and the fluid-solid coupling parameters of high speed pantograph under high speed train entered tunnel and high speed train run in the open air stably by three-dimensional numerical simulation.The data was more abundant This paper provided some reference for the design and operation of high-speed pantograph and some reference for the study of fatigue damage of pantograph.