摘要
为研究高速列车非对称通过标准高速铁路双线隧道引起的列车风分布规律及列车周围流场分布特性,基于有限体积法理论,采用数值计算方法模拟CRH380A高速列车通过双线隧道全过程,应用滑移网格技术模拟列车与周围环境相对运动。研究结果表明:隧道内气动压力系数计算结果与国内现场实测结果变化规律基本一致;列车车头、车尾通过时,纵向、横向列车风风速均突然增大,在列车通过阶段,纵向列车风经历正向—负向—正向流动,横向列车风由背离列车向指向列车转变;列车两侧空间纵向列车风风速在车尾通过之后达到最大,车顶上方空间的纵向风速在车头经过后达到最大;车尾通过之前,横向列车风变化规律基本相同,车尾经过后,横向列车风波动程度增加,而纵向列车风在车头通过之前变化规律相同,车头通过后,风速波动程度增加;车头、车尾及车身表面存在较大的速度梯度,近隧道侧纵向列车风速较远隧道侧的风速大;中间列车周围速度分布基本一致,而列车尾部尾流效应对近隧道侧列车风影响非常显著;列车头部、尾部附近流场结构变化严重,中间列车周围流场分布规律基本稳定;环状空间内纵向列车风与到列车表面距离的关系呈指数函数变化。
In order to study the law of train-induced wind distribution and the characteristics of the flow field around a train caused by high-speed train passing through a standard high-speed railway double-track tunnel asymmetrically,the whole process of CRH380A high-speed train passing through a double-track tunnel based on the finite volume method theory was simulated through numerical method.Sliding mesh method(SMM)was used to simulate the relative movement of the train and surroundings.The calculation results of the aerodynamic pressure coefficients in a tunnel were basically consistent with those of the field measurement.The results show that the longitudinal and transverse train-induced wind speeds increase sharply when the head car and rear car of the train pass.When the train passes,the longitudinal train-induced wind direction undergoes positive-negativepositive changes,while the transverse train-induced wind changes from diverging trains to pointing train.The speed of longitudinal train-induced wind reaches the maximum after the rear car passes on both sides of the train,while the speed of the longitudinal wind in the roof reaches the maximum after the head car passes through.Before the tail passes,the lateral train-induced wind changes basically the same and after the tail passes,the lateral wind fluctuation increases,while the longitudinal wind changes before the head passes and the longitudinal wind speed increases after the head passes.Furthermore,large velocity gradients exist on the head,rear and train body surface,and the longitudinal train-induced wind near the tunnel side is larger than that on the far tunnel side.The velocity distribution around the intermediate cars is basically the same,and the wake effect of the tail of the train has a significant effect on the wind of the train near the tunnel.The flow structures at the head and tail of the train changes severely,and the distribution of the flow field of the middle trains is basically stable.The relationship between the longitudinal train-induced
作者
王磊
骆建军
李飞龙
高立平
WANG Lei;LUO Jianjun;LI Feilong;GAO Liping(Key Laboratory of Urban Underground Engineering of the Ministry of Education,Beijing Jiaotong University,Beijing 100044,China;Beijing's Key Laboratory of StructuralWind Engineering and UrbanWind Environment,Beijing Jiaotong University,Beijing 100044,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第4期1346-1357,共12页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51678036)。
关键词
高速铁路
双线隧道
数值模拟
列车风
流场特性
high-speed railway
double-track tunnel
numerical simulation
train-induced wind
flow field characteristics
