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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。
Computational fluid dynamics (CFD) method is used to analyze the characteristics of the flow around the H-section in the critical state of flutter. The block analysis method is used to study the input characteristics of airflow energy in different regions of the model surface during flutter and the effect of vortex evolution on the model surface aerodynamic and aerodynamic energy input characteristics. The results show that the vortex evolution on the surface of the model results in a strong regularity of the surface pressure change near the model area of the windward side baffle, while the surface pressure change of the model area near the leeward side baffle has no obvious regularity. The results of the block analysis show that the upper surface area of the model close to the windward side baffle is the part that absorbs the airflow energy and the energy input into the area near the lee side baffle of the model has the characteristic of fluctuation that the total aerodynamic energy input into the model from A complete vibration cycle also has strong fluctuation characteristics, resulting in H-shaped section occurs when the chatter vibration longer torsion vibration.