展弦比对NACA0012弹性平直机翼颤振临界特性影响研究
Effect of Aspect-ratio on Flutter Critical Characteristics of NACA0012 Flexible Straight Wing
余秋阳 1徐胜金1
作者信息
摘要
展弦比是飞行器机翼设计的重要参数,研究其对机翼颤振临界特性的影响具有重要的工程应用价值.本文采用三维雷诺平均N-S方程和S-A湍流模型求解NACA0012弹性平直机翼的非定常气动力,结合由模态法建立的机翼结构动力学方程,发展了计算流体力学(CFD)/计算结构力学(CSD)颤振时域数值模拟方法.利用该方法研究了不同展弦比条件下机翼的颤振临界速度和频率.结果表明,由于展弦比较大且材质轻柔,机翼会出现一定幅度的垂向静弯曲变形.展弦比的增大不会影响机翼模态固有振型,但是会导致机翼颤振临界速度、颤振频率和模态固有频率的降低.
Abstract
Aspect-ratio is an important parameter in the design of aircraft wings,and studying its influence on the flutter critical characteristics of wings has significant engineering application value.This paper uses the three-dimensional Reynolds Averaged N-S equations and the S-A turbulence model to solve the unsteady aerodynamic forces of high-aspect-ratio NACA0012 flexible straight wings.Combining with the wing dynamic equation established by the modal method,a CFD/CSD flutter time-domain numerical simulation method is developed.This method is employed to study the influence of aspect-ratio on the flutter critical characteristics of the wing.The results indicate that due to the high-aspect-ratio and soft material,the wing has a certain range of vertical static bending deformation.The increase in aspect-ratio does not affect the natural mode shape of the wing,but reduces the modal natural frequency,flutter critical velocity,and flutter frequency.
关键词
展弦比/颤振临界特性/弹性平直机翼/模态/数值模拟Key words
aspect-ratio/flutter critical characteristics/flexible straight wing/mode/numerical simulation引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据