摘要
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 widely used in analysis of aircraft flight quality. Quick and accurate definition of dynamic derivatives in the conceptual design phase can reduce design cycle as well as the cost. Under the hypotheses of small structural displacements, a simplified method based on unsteady Euler equations was adopted to solve dynamic derivatives, and an unsteady normal perturbation velocity was superimposed to the reference free-stream solution in order to account for structural motion. The European standard model DLR-F12 for dynamic derivatives study demonstrated the reliability, computation efficiency and accuracy of the method. The results show good agreement with the experimental data. Thus, the method is proved to be applicable to dynamic derivatives computation for aircraft with complex configuration.
出处
《航空科学技术》
2017年第2期39-42,共4页
Aeronautical Science & Technology
