Effect of Aspect-ratio on Flutter Critical Characteristics of NACA0012 Flexible Straight Wing
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.
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