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该文通过适当简化推导了采用模型表面波动压力的形式来描述的颤振导数,基于流固松耦合的计算策略,利用现有流体软件的用户自定义(UDF)功能,应用数值方法分析了模型表面波动压力分布特性对颤振导数的影响。从细观层面上阐述了颤振导数对模型振动的影响及其气动耦合现象。该文研究表明颤振导数的气动耦合现象及其对模型颤振产生的不同作用取决于模型表面波动压力的分布特征,这就使得振动模型表面波动压力分布特性成为影响模型颤振的主要因素。在颤振临界状态下,振动模型表面波动压力的主要成分向模型迎风侧漂移,造成振动模型扭转运动的中心前移,与模型的几何扭转中心不再重合,发生了偏移。
In this paper, we derive the flutter derivatives described by the form of surface pressure fluctuations by appropriate simplification. Based on the fluid-solid coupling method and the user-defined (UDF) function of the existing fluid software, the numerical method is used to analyze the model Effect of Surface Pressure Variation on Flutter Derivatives. The effect of flutter derivative on the model vibration and its aerodynamic coupling are explained from the microscopic level. The study shows that the aerodynamic coupling of flutter derivatives and its different effects on model flutter depend on the distribution of pressure fluctuation on the surface of the model, which makes the pressure fluctuation on the surface of the vibration model become the main factor affecting the model flutter. In the flutter critical state, the main component of the pressure fluctuation on the surface of the vibration model drifts toward the windward side of the model, causing the center of the torsional movement of the vibration model to move forward, which is no longer coincident with the geometrical torsional center of the model.