Aerodynamic Analysis of a Localized Flexible Airfoil at Low Reynolds Numbers
Wei Kang 1, Jia-Zhong Zhang 1*, Pei-Hua Feng 11 School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China.
Received 15 May 2010; Accepted (in revised version) 15 May 2011
Available online 30 November 2011
A localized flexible airfoil at low Reynolds numbers is modeled and the aerodynamic performance is analyzed numerically. With characteristic based split scheme, a fluid solver for two dimensional incompressible Navier-Stokes equations is developed under the ALE framework, coupled with the theory of shallow arch, which is approximated by Galerkin method. Further, the interactions between the unsteady flow and the shallow arch are studied in detail. In particular, the effect of the self-excited vibration of the structure on aerodynamic performance of the airfoil is investigated deeply at various angles of attack. The results show that the lift-to-drag ratio has been increased greatly compared with the rigid airfoil. Finally, the relationship between the self-excited vibration and the evolution of the flow is analyzed using FFT tools.AMS subject classifications: 74F10, 76G25, 76D55, 76D05
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Key words: Fluid-structure interaction, Navier-Stokes equations, aerodynamic performance, lift enhancement and drag reduction, flow control.
Email: firstname.lastname@example.org (W. Kang), email@example.com (J.-Z. Zhang), firstname.lastname@example.org (P.-H. Feng)