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

作　　者：余秋阳 徐胜金[1] Yu Qiuyang;Xu Shengjin(Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学,北京100084

出　　处：《航空科学技术》2024年第6期44-50,共7页Aeronautical Science & Technology

基　　金：航空科学基金(201958058001);中国空气动力研究与发展中心旋翼空气动力学重点实验室研究开放课题(RAL202204-9)。

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。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 threedimensional 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 

分 类 号：V215.34[航空宇航科学与技术—航空宇航推进理论与工程]