摘要
为研究桥上动车组穿越复杂峡谷地形时的横风气动特性,本文以CRH6型动车组为研究对象,基于三维、粘性、不可压缩的N-S方程和κ-ε湍流模型,采用滑移网格技术,耦合高架桥、横风和车速,计算复杂三维峡谷地形下动车组的气动载荷.研究结果表明:列车表面压力在流线型头部有显著变化,压力最大值出现在列车头部鼻端点区域;随着车速和横风风速的增加,压力最大值、整车侧向力、升力和倾覆力矩均呈现增大的趋势;对比分析发现,列车穿越峡谷中时,整车侧向力、升力和倾覆力矩都达到最值,且横风风速增大对列车气动力特性的影响远远大于车速增大对列车气动力特性的影响.本文研究结果可为复杂峡谷地形条件下的桥上动车组安全平稳运行提供理论依据.
In order to study the cross-wind aerodynamic characteristics of the EMU on the bridge when crossing complex canyon terrains,this paper takes the CRH6 EMU as the research object,based on the three-dimensional,viscous,incompressible N-S equation and the most widely used κ-ε turbulence model in engineering.The slip grid technology is used to couple the viaduct,cross wind and vehicle speed to calculate the aerodynamic load of the EMU in the complex three-dimensional canyon terrains.The research results show that the surface pressure changes significantly on the train with a streamlined head,and the maximum pressure appears at the nose of the train head.With the increase of vehicle speed and cross wind speed,the maximum pressure,vehicle lateral force,lift and overturning moment all show an increasing trend.A comparative analysis shows the lateral force,lift force and overturning moment reach the maximum value when the train passes through a canyon.Compared with the increase of vehicle speed,the influence of cross wind speed on train aerodynamic characteristics is far greater than that on train aerodynamic characteristics.The research results of this paper can provide a theoretical basis for the safe,comfortable and smooth operation of the EMU trains on bridges under the complex canyon terrain conditions.
作者
严冠章
李志伟
曾广志
洪昌生
YAN Guan-zhang;LI Zhi-wei;ZENG Guang-zhi;HONG Chang-sheng(School of Rail Transportation,Wuyi University,Jiangmen 529020,China)
出处
《五邑大学学报（自然科学版）》
CAS
2021年第2期31-37,共7页
Journal of Wuyi University(Natural Science Edition)
基金
广东省创新强校工程青年创新人才类项目(2017KQNCX205)
江门市基础与理论科学研究类科技计划项目(2020JC01009,2019JC01021)
五邑大学高层次人才科研启动项目(2017RC37,2017RC36)。
关键词
峡谷地形
数值仿真
动车组
气动特性
Canyons terrains
Numerical simulations
EMU
Aerodynamic performance
