诱发H形桥梁断面风振的空气能量输入特征

发布时间：2018-06-18 06:30

本文选题：H形断面 + 分块分析　；参考：《工程力学》2014年01期

【摘要】：采用计算流体动力学(CFD)的方法,分析了H形断面颤振临界状态下的绕流特征。采用分块分析方法研究颤振过程中气流能量在模型表面不同区域的输入特性以及模型表面的旋涡演化过程对模型表面气动力和气动能量输入特性的影响。分析结果表明模型表面的旋涡演化造成了靠近迎风侧挡板的模型区域的表面压力变化具有较强的规律性,而背风侧挡板附近的模型区域的表面压力变化则没有明显的规律。分块分析的结果显示模型靠近迎风侧挡板的上表面区域是吸收气流能量的部位,而气流输入到模型背风侧挡板附近区域的能量具有波动特性,使得空气输入到模型的总气动能量在一个完整的振动周期内也具有较强的波动特征,从而造成H形断面颤振发生时出现持时较长的大幅扭转振动。
[Abstract]:The characteristics of flutter around H-section under critical state are analyzed by using the method of computational fluid dynamics (CFD). Block analysis method is used to study the input characteristics of air flow energy in different regions of the model surface and the influence of vortex evolution on the aerodynamic and aerodynamic energy input characteristics of the model surface. The results show that the vortex evolution of the model surface results in a strong regularity of the surface pressure variation near the windward baffle, but there is no obvious regularity in the model area near the leeward side. The results of block analysis show that the upper surface area of the model near the windward side baffle is the part where the energy of the air flow is absorbed, and the energy input from the airflow to the area near the windward side baffle of the model has fluctuating characteristics. The total aerodynamic energy input from the air to the model also has strong fluctuating characteristics in a complete vibration period, resulting in a large torsional vibration with a longer duration when the flutter of H-shaped section occurs.
【作者单位】：华北水利水电大学土木与交通学院;同济大学桥梁工程系;
【基金】：国家自然科学基金项目(51208197,5102114005) 华北水利水电大学高层次人才资助项目(201315)
【分类号】：U441;O35

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