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动导数是飞机飞行品质分析的关键参数,在飞机概念设计阶段快速可靠地预测动导数可缩短设计周期并减少成本。基于欧拉方程提出一种飞机组合动导数的简化计算方法,在模拟小幅强迫振动过程中忽略网格变形,通过对物面处流体添加法向扰动速度项模拟物面运动对流体造成的扰动。采用欧洲动导数研究标准模型DLR-F12对该方法进行了验证计算,计算结果与欧拉方法计算结果及试验数据具有较好的一致性。
Dynamic derivatives are the key parameters in aircraft flight quality analysis. Predicting dynamic derivatives quickly and reliably in the conceptual design phase can shorten the design cycle and reduce costs. Based on the Euler equation, a simplified method for calculating the combined derivative of aircraft is proposed. The grid deformation is neglected in the process of simulating small forcing vibration. The disturbances caused by the object-surface motion to the fluid are simulated by adding the normal disturbance velocity to the fluid at the object surface. The proposed method is validated by DLR-F12, a standard model for the study of dynamic derivatives in Europe. The calculated results are in good agreement with the Euler method and experimental data.