高速铁路隧道内接触网空气动力学影响因素研究

Study on Aerodynamic Factors of Overhead Catenary in High-speed Railway Tunnel

为了探究高速铁路隧道内接触网空气动力学的影响因素,基于有限体积法,建立动车组通过不同隧道的空气动力学模型,并采用流体力学软件数值模拟接触网空气的三维外流场。从仿真结果中得到不同工况条件下的风荷载极值,分析计算接触网线索的基本风偏移。研究结果表明:隧道内接触网风荷载的主要影响因素为隧道净空断面积与车速。动车组在隧道内通过和交会时,接触网线索的最大风偏移值随着隧道净空断面积的增大而减小,随着速度的增大呈非线性的方式增加。为保证安全,可考虑减小接触网的跨距长度或增大线索的水平张力来减少接触网线索的风偏移。

In order to explore the influencing factors of catenary aerodynamics in high-speed railway tunnels,based on the finite volume method,the aerodynamics models of train-set passing through different tunnels were established,and the three-dimensional outflow field of catenary air were numerically simulated by using fluid dynamics software.The extreme values of wind load under different working conditions were obtained from the simulation results,and the basic wind migration of catenary clues was analyzed and calculated.The results show that the main factors affecting the wind load of the catenary in the tunnel are tunnel clearance area and vehicle speed.When the train-set passes and crosses in the tunnel,the maximum wind offset value of the catenary clues decreases with the increase of the tunnel clearance area,and increases in a nonlinear way with the increase of the speed.In order to ensure safety,the wind deviation of catenary can be reduced by reducing the span length of catenary or increasing the horizontal tension of catenary.