高速列车经过跨线天桥脉动风压分析

发布时间：2018-01-08 12:31

本文关键词：高速列车经过跨线天桥脉动风压分析　出处：《铁道科学与工程学报》2017年01期 　论文类型：期刊论文

【摘要】：高速列车通过跨线天桥结构时在天桥与高速列车之间的狭小空间内产生较大的局部风压,跨线天桥结构对局部风压的高频脉动成分极为敏感。为了探究脉动成分的大小,采用CFD数值模拟,运用滑移网格技术,大涡模拟湍流模型(LES)对高速列车经过跨线天桥结构周围的三维、非定常、可压缩流场进行模拟,并与跨线天桥实测结果吻合。对保留脉动成分的LES模拟结果在时域上进行分析,探究脉动成分分布的位置,脉动极值空间分布,以及脉动风能量在列车风压中所占比例,同时在频域上采用小波包分析的方法对LES结果进行分解,分析各频段风压能量分布规律。研究结果表明:跨线天桥表面风压脉动成分极小。
[Abstract]:When the high-speed train passes the cross-line overpass structure, it produces a large local wind pressure in the narrow space between the overpass and the high-speed train. Cross-line flyover structure is very sensitive to the high frequency pulsation components of local wind pressure. In order to explore the magnitude of pulsating components, CFD numerical simulation and sliding grid technique are used. Large eddy simulation turbulence model (les) is used to simulate the three-dimensional, unsteady and compressible flow field around the structure of a high-speed train passing through a cross-line flyover. The results of LES simulation with pulsating components are analyzed in time domain to explore the location of pulsation composition distribution and the spatial distribution of pulsating extremum. And the proportion of pulsating wind energy in the train wind pressure, at the same time, the wavelet packet analysis method is used to decompose the LES results in the frequency domain. The wind pressure energy distribution in different frequency bands is analyzed. The results show that the wind pressure pulsation on the surface of the cross-line flyover is very small.
【作者单位】：北京交通大学土木建筑工程学院;结构风工程与城市风环境北京市重点实验室;
【基金】：中央高校基本科研业务费专项资金资助项目(2012JBM007) 新世纪优秀人才支持计划资助项目(NCET-11-0571) 国家自然科学基金优秀青年基金资助项目(51422801)
【分类号】：U441.3
【正文快照】： 2.结构风工程与城市风环境北京市重点实验室,北京100044)近年来,随着高铁技术的迅猛发展,高速铁路经历了数次提速。列车高速通过相对封闭的跨线天桥结构时,高速列车形成的气流会在跨线天桥结构与列车之间产生空气活塞压缩效应[1-3]。产生较大的风压变化和风致响应,引起沿线跨

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