A Scaling Parameter for the Thrust Generation of Flapping Flexible Wings
TLDR
In this paper, the authors investigated the influence of the density ratio and the effective stiffness on the thrust generation of a flapping thin isotropic flat Zimmerman wing in still air at = 1.5×10 3.Abstract:
Thrust generation and scaling parameters for flapping flexible wings are investigated using an integrated framework of computational fluid dynamics and structural dynamics solvers. To explore the influences of the density ratio and the effective stiffness on the thrust generation, surrogate models have been generated for a flapping thin isotropic flat Zimmerman wing in still air at = 1.5×10 3 . Time averaged thrust, bending angle, and twist show qualitatively similar behavior and increased with higher ratio between the density ratio and effective stiffness. Flexibility-induced twisting in the wing promotes the thrust generation. To further investigate the flexibility-induced thrust enhancement, plunging chordwise flexible airfoils in forward flight at = 9.0×10 3 in water are considered. Time averaged thrust increases with larger airfoil thickness, however the thinnest airfoil responded with degradation in performance when motion frequency becomes high. Finally, unified scaling parameters are proposed based on properly normalized governing equations and give a priori order of magnitude estimation of the time averaged thrust and the degree of fluid-structure coupling. The results show that these scaling parameters, given as combinations of the wing geometry, structural properties, and the motion amplitude and frequency, can be applied for both cases with different motion type, Reynolds number, and the fluid medium.read more
Citations
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Journal ArticleDOI
Effects of Flexibility on the Aerodynamic Performance of Flapping Wings
TL;DR: In this paper, the effects of chordwise, spanwise, and isotropic flexibility on the force generation and propulsive efficiency of flapping wings are elucidated, and a relationship between the propulsive force and the maximum relative wing tip deformation parameter is established.
Proceedings ArticleDOI
Effects of flexibility on the aerodynamic performance of flapping wings
TL;DR: In this paper, the effects of chordwise, spanwise, and isotropic flexibility on the force generation and propulsive efficiency of flapping wings are elucidated, and a relationship between the propulsive force and the maximum relative wing tip deformation parameter is established.
Proceedings ArticleDOI
Approximate Aerodynamic and Aeroelastic Modeling of Flapping Wings in Hover and Forward Flight
TL;DR: In this article, the aerodynamic and aeroelastic results of a nonlinear structural dynamic model based on MARC with an approximate aerodynamic model that incorporates leading edge vortices and a wake model are presented.
Dissertation
Flapping Wing Micro Air Vehicles: An Analysis of the Importance of the Mass of the Wings to Flight Dynamics, Stability, and Control
TL;DR: Girard et al. as discussed by the authors analyzed the flight dynamics, stability, and control of a model flapping wing micro air vehicle with a focus on the inertial and mass effects of the wings on the position and orientation of the body.
Proceedings ArticleDOI
Flow Around Flapping Flexible Flat Plate Wings
TL;DR: In this paper, the authors investigate the unsteady flow phenomena generated from plunging wings with varying flexibility in a wind tunnel with forward flight conditions at a chord-based Reynolds number of 5300.
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Journal ArticleDOI
Recent progress in flapping wing aerodynamics and aeroelasticity
Wei Shyy,Hikaru Aono,Satish Kumar Chimakurthi,Pat Trizila,Chang-Kwon Kang,Carlos E. S. Cesnik,Hao Liu +6 more
TL;DR: In this article, a review of the recent progress in flapping wing aerodynamics and aeroelasticity is presented, where it is realized that a variation of the Reynolds number (wing sizing, flapping frequency, etc.) leads to a change in the leading edge vortex (LEV) and spanwise flow structures, which impacts the aerodynamic force generation.