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Image of Vibration Testing and System Dynamics
ISSN: 2475-4811 (print)
ISSN: 2475-482X (online)
Journal of Vibration Testing and System Dynamics

C. Steve Suh (editor), Pawel Olejnik (editor),

Xianguo Tuo (editor)

Pawel Olejnik (editor)

Lodz University of Technology, Poland

Email: pawel.olejnik@p.lodz.pl

C. Steve Suh (editor)

Texas A&M University, USA

Email: ssuh@tamu.edu

Xiangguo Tuo (editor)

Sichuan University of Science and Engineering, China

Email: tuoxianguo@suse.edu.cn

Lift Enhancement of Airfoil Using Local Flexible Structure and the Influences of Structure Parameters

Journal of Vcibration Testing and System Dynamics 2(2) (2018) 155--165 | DOI:10.5890/JVTSD.2018.06.004

Pengfei Lei$^{1}$, Jiazhong Zhang$^{2}$, Daxiong Liao$^{1}$

$^{1}$ Facility Design and Instrumentation Institute, China Aerodynamics Research and Development Center, Mianyang, Sichuan, P. R. of China

$^{2}$ School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi, P. R. of China

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Abstract

The local flexible structure (LFS) is used on the airfoil to enhance the lift, and the influences of structure parameters of LFS on the lift enhancement are studied numerically. Coupling with the structure solver, the unsteady flows over airfoil with LFS are simulated by using the CBS-ALE scheme and dual time stepping. The results show that the amplitude oscillation is the key factor to enhance the lift as the self-induced oscillation is used. The large oscillation amplitude of LFS can only be induced in certain frequency range with suitable structure parameters, such as smaller elastic stiffness and damping. The oscillation of LFS can lead to the formation of individual separation bubble and vortex, which are beneficial to the lift enhancement of airfoil. With large oscillation amplitude, vortices with low pressure can be generated early and stay on upper surface of airfoil for a long time, resulting in the significant lift enhancement.

Acknowledgments

The research is supported by the National Fundamental Research Program of China (No. 2012CB026002) and the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (No. 2013BAF01B02).

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