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通过风洞试验研究流线型较好的平板断面颤振性能,基于流固松耦合的计算策略,应用CFD数值方法,模拟平板颤振过程。并用相位平均方法研究颤振临界状态下模型尾部旋涡的演化规律,分析表明模型尾部风嘴处呈直线排列的涡街规律性摆动主导结构振动直至模型振动发散。利用分块分析思路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及模型尾部旋涡演化过程对模型表面气动力分布与能量输入特性影响。分块分析结果表明振动模型通过迎风端风嘴从气流中吸收大量能量,且在一完整振动周期内气流输入到振动系统的能量不断增加,造成平板颤振多为结构稳定性突然丧失。
Through the wind tunnel test, the flutter performance of streamlined planar section is studied. The CFD numerical method is used to simulate the plate flutter process based on the fluid-solid coupling method. The phase averaging method is used to study the evolution of the vortex at the tail of the flutter. The results show that the vibration of the regular vortex at the tail of the model winds linearly until the vibration of the model diverges. The influence of the airflow energy in different regions of the model surface and the vortex evolution process at the tail of the model on the aerodynamic force distribution and energy input characteristics of the model surface are studied by the method of block analysis. The results of the block analysis show that the vibration model absorbs a large amount of energy from the airflow through the windward nozzle and the energy input into the vibration system increases continuously during a complete vibration period, resulting in the sudden loss of structural flutter.