横风作用下高速列车-32m简支梁桥系统气动性能三维数值模拟

发布时间：2018-10-23 15:52

【摘要】：横风作用下,行驶在桥梁上的列车和桥梁之间存在明显的气流相互干扰,增加列车事故发生的可能性。为研究高速列车与桥梁之间的相互气动影响,基于大型计算流体力学软件Fluent,采用三维、定常、不可压缩Navier-Stokes方程,选用适应性良好的Realizable k-ε湍流模型,模拟风洞试验中横风(均匀风0°攻角,90°风偏角)作用下高速列车与32 m简支梁桥系统空气动力学行为。研究结果表明:风速在5~25 m/s变化时对车桥气动力系数影响不大;车下桥梁受到列车的干扰,阻力系数增大、升力系数和倾覆力矩系数(以下简称为力矩系数)均减小;桥上列车侧力系数、升力系数及力矩系数较平坦地面时均增大,即桥上列车运行安全性更差。
[Abstract]:Under the action of crosswind, there is obvious air interference between the train running on the bridge and the bridge, which increases the possibility of train accident. In order to study the aerodynamic interaction between high-speed train and bridge, the three-dimensional, steady and incompressible Navier-Stokes equations are used based on the large-scale computational fluid dynamics software Fluent, and the Realizable k- 蔚 turbulence model with good adaptability is used. The aerodynamic behavior of high-speed train and 32 m simply supported beam bridge system under the action of cross wind (0 掳attack angle of uniform wind, 90 掳wind deflection angle) in wind tunnel test is simulated. The results show that the aerodynamic coefficients of the vehicle-bridge are not affected by the wind speed at 5m / s, the drag coefficient increases, the lift coefficient and the overturn moment coefficient (hereinafter referred to as the torque coefficient) decrease, and the drag coefficient increases when the vehicle under the bridge is disturbed by the train. The lateral force coefficient, lift coefficient and torque coefficient of the train on the bridge increase when compared with the flat ground, that is to say, the safety of the train on the bridge is worse.
【作者单位】：中南大学土木工程学院;中南大学高速铁路建造技术国家工程实验室;
【基金】：国家自然科学基金资助项目(51178471,51322808) 教育部新世纪优秀人才支持计划资助项目(NCET-12-0550)
【分类号】：U441;U270.11

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