风屏障高度对城轨专用斜拉桥车桥系统气动特性的影响

发布时间：2018-07-27 20:07

【摘要】：在综合考虑风屏障高度对桥梁及桥上列车气动特性影响的前提下,采用风洞试验和数值模拟相结合的方法,研究在桥梁上设置不同高度风屏障的情况下列车与桥梁的气动力系数以及车桥系统周围的流场分布情况。研究结果表明:随风屏障高度增加,桥梁的阻力系数明显增大,而桥上列车的阻力系数相应减小,桥梁与列车的升力系数变化不明显;在侧风作用下,风屏障高度对处于桥面迎风位置列车的所受气动力影响较明显;风屏障高度对车桥系统周围流场的影响较明显,当风屏障高度增加时,梁体迎风面正压区显著增大;车体迎背风面的压力分布不仅受风屏障高度的影响,而且受列车在桥面的位置的影响。
[Abstract]:On the premise of considering the influence of wind barrier height on the aerodynamic characteristics of bridges and trains on bridge, the wind tunnel test and numerical simulation are used. The aerodynamic coefficients of the train and bridge and the distribution of the flow field around the vehicle-bridge system are studied under the condition of installing different height wind barriers on the bridge. The results show that with the increase of the height of the wind barrier, the drag coefficient of the bridge increases obviously, while the drag coefficient of the train on the bridge decreases accordingly, and the lift coefficient of the bridge and the train does not change obviously. The influence of the height of the wind barrier on the aerodynamic force of the train at the windward position on the bridge deck is obvious, and the influence of the height of the wind barrier on the flow field around the bridge system is more obvious. When the height of the wind barrier increases, the barotropic zone of the windward surface of the beam body increases significantly. The pressure distribution of the front and leeward plane is affected not only by the height of the wind barrier, but also by the position of the train on the bridge deck.
【作者单位】：中南大学土木工程学院高速铁路建造技术国家工程实验室;
【基金】：国家自然科学基金资助项目(51678576,51378511,51178471) 国家重点研发计划项目(2017YFB1201204) 湖南省高校创新平台开放基金资助项目(13K006)~~
【分类号】：U441.3;U448.27

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