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考察某无人机模型的阵风气动响应特性和基于直接力操纵的阵风减缓效果。在求解非定常Euler方程时引入“网格速度”方法模拟阵风边界条件,通过动态嵌套网格技术实现舵面运动。首先对NACA0006翼型迎角阶跃型阵风的气动力响应进行了验证计算,计算结果与理论结果、文献计算结果吻合良好。在此基础上对某无人机模型在迎角阶跃型、One-minus-cosine型阵风作用下的气动力响应过程进行了数值模拟,并分析评估了不同舵面运动方式对飞机气动性能的影响。最终研究比较了不同舵面运动方式下阵风气动响应的减缓效果。结果表明:通过合理设计舵面运动,可以有效达到抑制阵风引起的非定常气动干扰的目的。
The characteristics of gust aerodynamic response of a UAV model and gust mitigation effects based on direct force manipulation are investigated. In the solution of unsteady Euler equations, “grid velocity ” method is introduced to simulate the gust boundary conditions and the rudder motion is implemented by the dynamic nested grid technique. First of all, the aerodynamic response of NACA0006 airfoil with angle-of-attack step gust is verified and calculated. The calculated results are in good agreement with the theoretical and literature results. On this basis, the aerodynamic response of a UAV model under angle of attack, One-minus-cosine gust is numerically simulated and the effects of different rudder motion on aerodynamic performance influences. The final study compared the mitigation effect of gust aerodynamic response with different rudder motion patterns. The results show that the purpose of suppressing the unsteady aerodynamic interference caused by gust can be effectively achieved by reasonably designing the rudder motion.