摘要
我国西北兰新高铁沿途地区风力强劲及荒漠化严重,频繁遭遇沙尘暴的侵袭。为了探究强风沙环境对兰新高铁接触网正馈线舞动的影响,基于SST k-ω湍流模型和欧拉-欧拉双流体模型,建立接触网正馈线空气动力学计算模型,模拟得到正馈线位置处风速及风仰角变化规律,并探究不同沙粒浓度及风速条件下接触网正馈线气动特性。继而,通过ANSYS有限元软件建立正馈线有限元模型,利用Davenport风速谱模拟正馈线处脉动风场,并对导线施加相应风荷载,分析正馈线在强风沙环境中的舞动响应。研究结果表明:随着沙粒相体积分数的增大,导线后的尾流震荡逐渐消失,流场的速度分布趋于平均化。导线的气动阻力系数随风速的增大而减小,随沙粒浓度的增加而呈明显递增趋势;气动升力系数较净风环境波动幅度减小,呈正负交替变化且趋近于0,具有随机性。同时,在沙粒浓度为4%,风速为20 m/s和30 m/s时,正馈线水平位移和垂直位移分别出现峰值,相较净风环境增大了70.7%和38.6%,其动张力最高可达净风环境的155%。风沙流使得正馈线脱离自振频率且位移频谱增加,风速为15 m/s,沙粒体积分数为4%时,正馈线水平和垂直位移频谱增大约77.5%和11.3%。研究成果可进一步揭示风沙影响下接触网附加导线舞动机理,为沙尘暴环境下接触网抗舞设计提供理论支撑。
The areas along the Lanzhou-Xinjiang high-speed railway have strong winds and serious desertification,and are frequently attacked by sand and dust storms.To explore the influence of strong wind and sand environment on the galloping of the catenary auto transformer feeder of the Lanzhou-Xinjiang high-speed railway,based on SST k-ωturbulence model and Euler-Euler two-fluid model,the aerodynamic calculation model of the auto transformer feeder was established.The variation of wind speed and wind elevation angle at the position of the auto transformer feeder was simulated.The aerodynamic characteristics of the catenary auto transformer feeder under different sand concentrations and wind speeds were explored.Then,the finite element model of the auto transformer feeder was established by ANSYS finite element software.The Davenport wind speed spectrum was used to simulate the fluctuating wind field at the auto transformer feeder.The corresponding wind load was applied to the wire to analyze the galloping response of the auto transformer feeder in the strong wind and sand environment.The results show that with the increase of the volume fraction of the sand phase,the wake oscillation behind the wire gradually disappears,and the velocity distribution of the flow field tends to be average.The aerodynamic drag coefficient of the wire decreases with the increase of wind speed,and increases with the increase of sand concentration.The fluctuation range of the aerodynamic lift coefficient is smaller than that of the net wind environment,and it changes alternately positive and negative and approaches 0,which is random.The research results can further reveal the galloping mechanism of catenary additional wire under the influence of wind and sand,and provide theoretical support for the anti-galloping design of catenary in sand storm environment.
作者
赵珊鹏
张鹏飞
张友鹏
葛磊蛟
刘源涛
李军丽
任丽苗
ZHAO Shanpeng;ZHANG Pengfei;ZHANG Youpeng;GE Leijiao;LIU Yuantao;LI Junli;REN Limiao(School of Automatic&Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Rail Transit Electrical Automation Engineering Laboratory of Gansu Province(Lanzhou Jiaotong University),Lanzhou 730070,China)
出处
《铁道科学与工程学报》
北大核心
2025年第5期2280-2292,共13页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51867013)
甘肃省自然科学基金资助项目(25JRRA174)
国铁集团系统性重大科技项目(2024XTZD03)
中国铁路北京局集团有限公司科技研究开发计划(2024AGD03)
天津市自然科学基金多元投入重点项目(22JCZDJC00660)。
关键词
风沙环境
正馈线
欧拉两相流
体积分数
气动特性
舞动响应
sandy environment
auto transformer feeder
Eulerian two-phase flow
volume fraction
aerodynamic characteristics
galloping response
