摘要
高速列车通过不同防风工程的过渡段时,工程边界的变化会引发列车气动性能产生急剧变化进而引发车体晃动。通过对兰新高铁复杂环境下防风工程过渡区域流场变化规律及气动特性的研究,探明突变边界引发的风流场突变机制及演化规律。结合工程优化的可行性、经济性等实际情况,提出加高薄弱段挡风墙结合降低路堑挖方的综合性工程优化方案,工程实施后现场实测表明区域内风速突变显著降低,工程效果明显。对于复杂环境下高速铁路防风工程过渡段的优化,需重视不同结构过渡边界引发的风切变机制及演化规律的研究,重点从改善突变流场结构、弥补工程薄弱环节入手,结合地形地貌及工程条件因地制宜地采取工程对策。
When a high-speed train passes through the transitional region of different windbreaks,the aerodynamic performance of the train deteriorates rapidly due to the sudden boundary change,and further causing vehicle shakes.This article discussed the flow field and aerodynamic characteristics of the train passing through transitional zones of the windproof facilities in the complex environment of the Lanzhou-Xinjiang high-speed railway.The mechanism and evolution law of the wind field caused by the sudden boundary change was explored.Based on the feasibility and economic efficiency,overall engineering optimizations were given that vulnerable regions of the windbreaks should be heightened and cutting excavation should be reduced.The wind field measurement after the implementation of the improvement indicates the sudden change of wind speed in the area is significantly reduced.For the optimization of the transitions of windbreaks along the high-speed railway,it is necessary to pay attention to the mechanism and evolution law caused by the transitions of different structures.Engineering measures should be made based on the local landforms and topography,especially on the improvement of the abrupt flow field and amendments for the vulnerable regions.
作者
李鲲
LI Kun(China Railway First Survey and Design Institute Group Ltd.,Xi’an 710043,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2021年第11期2797-2805,共9页
Journal of Railway Science and Engineering
基金
中铁第一勘察设计院集团有限公司科技研究开发计划项目(院科15-04)。
关键词
高速铁路
防风工程
过渡段
流场
气动特性
工程对策
high-speed railway
windproof facility
transition section
flow field
aerodynamic characteristics
engineering measures
