Crosswind stability of a high-speed train on a high embankment
Crosswind stability of a high-speed train on a high embankment
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DOI：
10.1243/0954409jrrt126
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发表时间：
2007-03
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影响因子：
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通讯作者：
B. Diedrichs;M. Sima;A. Orellano;H. Tengstrand
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文献类型：
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作者：
B. Diedrichs;M. Sima;A. Orellano;H. Tengstrand
摘要本文介绍了德国联邦铁路公司的城际快车2号高速列车的主要控制单元（808级）的数值和实验获得的风稳定性的空气动力学结果。列车模型位于6米高的路堤上，符合拟议的欧洲互操作列车规范，即所谓的互操作性技术规范。该研究的目的是传达的预测精度，典型的稳态计算流体动力学-雷诺平均Navier-Stokes方法（行业标准）返回，并有助于了解当前应用的空气动力学。根据路堤上游的起始速度，当列车和路堤受到30°横摆角的稳定块体剖面扰动时，应注意列车和路堤周围的空气动力学。路堤工况的雷诺数Re为4.6 × 106。计算结果是用商业程序STAR-CD获得的，完全采用六面体网格，总单元数为13.5 × 106。结果表明，当列车站在迎风和背风轨道上的路堤顶部。这些结果是第一次与平地的情况下，从以前的研究。然后在1：100模型的高压风洞中进行了实验。通过将环境压力提高60倍来补偿Re效应，这增加了空气密度，从而以类似的系数增加了Re。计算结果与实验结果吻合较好，计算和实验都预测背风面的情况更为关键。此外，机械性能的相关后果，即汽车的稳定性，通过准静态力学分析进行了简要说明。本研究的结果表明，与当前列车相关的6 m高路堤使允许的风速降低了约20%。
Abstract This work presents aerodynamic results of crosswind stability obtained numerically and experimentally for the leading control unit (class 808) of Deutsche Bahn AG's high-speed train Inter-CityExpress 2. The train model is on top of a 6m high embankment in accordance with the proposed European code for interoperable trains, the so-called technical specifications for interoperability. The purpose of the study is to convey the predictive accuracy that typical steady-state computational fluid dynamics-Reynolds average Navier-Stokes methods (industry standard) return and to contribute to the understanding of the aerodynamics for the current application. Attention is drawn to the aerodynamics around the train and embankment when subjected to a steady block profile crosswind of 30° yaw angle on the basis of the onset velocity far upstream the embankment. The Re (Reynolds number) of the embankment cases is 4.6 × 106. Calculated results are obtained with the commercial code STAR-CD, with exclusively hexahedral meshes with a total cell count of 13.5 × 106. Results are obtained when the train stands on the windward and leeward tracks on top of the embankment. These results are first compared with a flat ground case from a previous study. Then experimental data are obtained in a high-pressure wind tunnel with a model scale of 1:100. Re effects are compensated by raising the ambient pressure by a factor of 60, which increases the air density and thus the Re by a similar factor. Calculated results are in fair agreement with the experiments, where both the calculations and the experiments predict the leeward case to be the more critical one. In addition, the related consequences on the mechanical behaviour, i.e. the stability of the car, are briefly addressed by means of a quasi-static mechanical analysis. The results of the present study indicate that the 6m high embankment concerning the current train reduces the permissible crosswind speed with approximately 20 per cent.