基于分离涡方法的高速列车横风非定常气动特性
Aerodynamic force/moment for high-speed train in crosswind field based on DES
查看参考文献16篇
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文摘
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采用分离涡方法模拟恒定风场中高速列车绕流的非定常流动,在时域和频域内分析车辆气动特性的瞬态性质。结果表明:在恒定来流中,列车的背风侧和尾车的尾迹区存在着强度不同、空间几何尺度各异并随时间随机变化和脉动的分离涡;各节车辆的非定常气动荷载的时均值与按整场定常流动计算得到的结果基本一致,但瞬态荷载峰值却比时均值高出较多;振幅频谱和功率谱密度的最大峰值所对应的频率不尽相同,但都集中在0~4 Hz内,处于某些列车部件的固有频率范围内。头车的横向力和倾覆力矩的分布频率范围较大,与车体自身频率耦合的范围较宽,横风气动安全性较差。 |
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其他语种文摘
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Flow field around high-speed train and transient behavior of the aerodynamic characteristics in constant wind field were simulated by Detached Eddy simulation, and the unsteady property was analyzed. The results show that, in steady inlet flow field, there are separated vortexes with different intensities and geometric dimensions that change and pulse randomly with time on the leeward side and wake region of train; that the time-averaged value of unsteady aerodynamic load value of each car is almost the same as that calculated in whole-field steady flow, while the peak value of transient load is higher than the time-averaged value; that the maximum peak values of amplitude frequency spectrum and power spectrum are not the same, but they are concentrated in 0–4 Hz, which is in the range of inherent frequency of some train parts. For head car, the range of distribution frequency of lateral force and overturning moment is large, it has a wide range of frequency coupling with the train itself, and the aerodynamic safety is poor in crosswind. |
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来源
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中南大学学报. 自然科学版
,2015,46(3):1129-1139 【核心库】
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DOI
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10.11817/j.issn.1672-7207.2015.03.046
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关键词
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高速列车
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横风
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气动力/力矩
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功率谱密度
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分离涡模拟
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地址
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1.
北京交通大学土木建筑工程学院, 北京, 100044
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中国科学院力学研究所, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-7207 |
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学科
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铁路运输 |
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基金
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国家自然科学基金资助项目
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国家“十一五”科技支撑计划重大项目
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中国博士后科学基金
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文献收藏号
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CSCD:5418447
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