铁路风屏障对轨道上方风压分布影响的风洞试验研究  

Effects of wind screen on wind pressure distribution above railway tracks by wind tunnel test

作　　者：向活跃[1] 李永乐[1] 胡喆[2] 廖海黎[1] 

机构地区：[1]西南交通大学桥梁工程系,成都610031 [2]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《实验流体力学》2012年第6期19-23,共5页Journal of Experiments in Fluid Mechanics

基　　金：国家自然科学基金项目(50508036);教育部新世纪优秀人才支持计划(NCET-06-0802);四川省杰出青年学科带头人计划(2009-15-406);西南交通大学博士生创新基金

摘　　要：为明确风屏障对轨道上方风压分布的影响,通过模型风洞试验,采用风压排管测试了轨道上方的风压系数剖面,与CFD模拟结果进行了对比,讨论了平地路基、高路堤、桥梁3种典型线路情况下风屏障设置方式、风屏障高度等对轨道上方风压分布的影响,分析了风屏障的气动机理。研究表明:迎风侧风屏障有效地减小了轨道上方的风压值,背风侧风屏障会增加轨道上方的负压;在3种线路构造中,桥上的风压值最大,能量耗散最小,而高路堤能量耗散最大,并对接触网有一定的防风作用。In order to comprehend the wind screen effects to the distribution of wind pressure above tracks, the wind pressure coefficient profile was tested by the wind tunnel test using the wind pressure row tube, and numerical simulation was carried out to contrast with wind tunnel test. The effects of wind screens in leeward, heights of wind screen on the ground roadbed, high embankment and bridge conditions were discussed on the distribution of wind pressure above tracks, and the mechanism of aerodynamics was analyzed. It shows that the wind pressure above tracks were significantly decreased by wind screens in windward; the wind screens in leeward in- creased the negative pressure above tracks; in the three line structure forms, the wind pressure above tracks on bridge was maximum, the energy dissipation was minimum, and the energy dissipa- tion on high embankment were maximum, meanwhile, the wind pressure coefficients on catenary was decreased when the wind screens were installed on high embankment.

关 键 词：风屏障 风压系数 风洞试验 线路构造形式 

分 类 号：TU375.4[建筑科学—结构工程]