长编组高速列车的列车风动模型实验研究
MOVING MODEL ANALYSIS OF THE SLIPSTREAM OF A LONG GROUPING HIGH-SPEED TRAIN
查看参考文献38篇
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文摘
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列车风是高速列车运行时诱导产生的气流流动,是列车空气动力学重要的研究内容和保证列车运行安全的重要方面.本文利用缩尺比例为1:8的八编组高速列车模型进行了列车风的动模型实验,测试了明线运行状态下列车周围的流动参数,突破了短编组列车风动模型测试所带来的局限性.列车风系综平均曲线和标准差曲线说明:列车头部会引起稳定的列车风,在车身和车尾处的列车风具有非常明显的非定常特征.列车风所反映的车身周围的气流扰动在第二节车厢开始显现,列车风速振荡上升,在第七节车厢达到局部最大值.转向架舱和车厢间风挡间隙的气流干扰并没有在列车风曲线上表现出来.利用本征正交分解法分析列车风尾迹区的实验结果,发现列车风的扰动能量集中于近尾迹区,次之是车身发展区.以各次实验结果中列车风的峰值位置距离车尾远近为条件,对列车风实验结果进行条件平均分析,表明列车尾涡生成时与列车风探针间的相对位置关系会影响列车风尾迹区的峰值形态. |
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其他语种文摘
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The slipstream is the air flow induced by the high speed train passing by,which continues to be an important aspect of aerodynamic performance and a critical factor of safe operation.In this paper,a 1:8 scaled eight-group type model of a high-speed train was measured on the moving model rig,and the characteristic of the flow around high-speed train can be observed.The long group type model can break through the limitation of the reduced length to wide ratio in the moving model experiment.The slipstream of a high-speed train has a stable local peak in the nose and a remarkable unsteady characteristic in the area of body and wake of the high speed train which indicated by the ensemble average profile and the ensemble standard deviation profile of the slipstream.The slipstream profile indicated that fluctuation of the flow around the eight-group high-speed train appeared at the second coach,the velocity rose vibrationally and reach the local maximum at the seventh coach.But the perturbation caused by bogie cabins and inter carriage gaps did not appear in the slipstream profile.The experimental results in the wake of slipstream were decomposed by Proportional Orthogonal Decomposition (POD).It is found that the fluctuating energy intensively appeared in the near-wake region,and appeared in the trailing area of body secondly.Conditional averaging was applied to analyzing the experimental results of slipstream in the moving model experiment.The condition of the conditional averaging was the distance between the peak location of slipstream profile and the tail of the high speed train model.The result of conditional averaging of slipstream indicated that the relative position between the slipstream measurement probes and the wake vortices may impact the peak of slipstream profile in the wake of the train when the vortices generated. |
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来源
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力学学报
,2021,53(1):105-114 【核心库】
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DOI
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10.6052/0459-1879-20-226
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关键词
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高速列车
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列车风
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八编组列车模型
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本征正交分解法
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条件平均
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地址
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1.
中国科学院力学研究所, 中国科学院流固耦合系统力学重点实验室, 北京, 100190
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中国科学院大学工程科学学院, 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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0459-1879 |
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学科
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铁路运输 |
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基金
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中科院先导专项资助项目
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文献收藏号
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CSCD:6889709
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