兰新二线防风明洞风载荷特性数值模拟  

Numerical Simulation for Wind Load Characteristics of Anti-wind Tunnel on Round-trip Railways of Lanzhou-Xinjiang

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作  者:霍卿[1] 梅元贵[1] HUO Qing;MEI Yuan-gui(Gansu Province Engineering Laboratory of Rail TransitMechanics Application/Lanzhou JiaotongUniversity,Gansu 730070,China)

机构地区:[1]兰州交通大学甘肃省轨道交通力学应用工程实验室,甘肃兰州730070

出  处:《山东农业大学学报(自然科学版)》2018年第5期800-804,共5页Journal of Shandong Agricultural University:Natural Science Edition

基  金:中国铁路总公司兰新铁路第二双线大风条件下行车安全专项试验(Z2014-034)

摘  要:本文应用SSTk-w湍流模型模拟兰新二线防风明洞气动载荷特性,讨论了防风明洞毗邻建筑结构和远场地貌以及大风风向对气动载荷的影响。结果表明:明洞附近的类路堑地貌结构增强了明洞迎风侧和背风侧载荷分布的不均匀性;明洞承受最大风载荷位置均出现在以明洞中轴线和水平线为直角约60°~75°范围的迎风侧拱顶;75°风向角时升力、倾侧和扭转力矩最大;60°时明洞的仰俯效应最明显。研究结果能够真实反映防风明洞气动载荷特征。The aerodynamic characteristics of the anti-wind tunnel on Lanzhou-Xinjiang high-speed railway under constant-velocity cross-wind was studied using SST k-ω turbulence model with considering of the effect of the adjacent buildings andfar field effect of landform and different directions. Research shows that the landform which similar to the road cut structureenhanced the uneven distribution of the load on the upwind side and the leeward side of anti-wind tunnel. The maximumwind load location is on the top of the upwind side between the axis and the horizontal line in about 60°~75° range under allwind directions. It is pointed The lift, overturning moment and torsion effect of the anti-wind tunnel is maximum at 75° windangle. The pitching effect is obvious at 60° wind angle. The results can reflect the reality aerodynamic load characteristics ofthe anti-wind tunnel.

关 键 词:防风明洞 风载荷 数值模拟 

分 类 号:U270.1[机械工程—车辆工程]

 

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