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Unsteady Flow Separation and High Performance of Airfoil with Local Flexible Structure at Low Reynolds Number

Published online by Cambridge University Press:  03 June 2015

Peng-Fei Lei ,
Jia-Zhong Zhang ,
Wei Kang ,
Sheng Ren  and
Le Wang
Peng-Fei Lei*
Affiliation:
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. China
Jia-Zhong Zhang*
Affiliation:
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. China
Wei Kang*
Affiliation:
School of Astronaustics, Northwestern Polytechnical University, Xi’an 710072, P.R. China
Sheng Ren*
Affiliation:
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. China
Le Wang*
Affiliation:
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. China
*
Corresponding author.Email:jzzhang@mail.xjtu.edu.cn
Email:pflei@stu.xjtu.edu.cn
Email:wkang@nwpu.edu.cn
Email:rensheng901728@126.com
Email:wangled@163.com
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Abstract

The unsteady flow separation of airfoil with a local flexible structure (LFS) is studied numerically in Lagrangian frames in detail, in order to investigate the nature of its high aerodynamic performance. For such aeroelastic system, the characteristic-based split (CBS) scheme combined with arbitrary Lagrangian-Eulerian (ALE) framework is developed firstly for the numerical analysis of unsteady flow, and Galerkin method is used to approach the flexible structure. The local flexible skin of airfoil, which can lead to self-induced oscillations, is considered as unsteady perturbation to the flow. Then, the ensuing high aerodynamic performances and complex unsteady flow separation at low Reynolds number are studied by Lagrangian coherent structures (LCSs). The results show that the LFS has a significant influence on the unsteady flow separation, which is the key point for the lift enhancement. Specifically, the oscillations of the LFS can induce the generations of moving separation and vortex, which can enhance the kinetic energy transport from main flow to the boundary layer. The results could give a deep understand of the dynamics in unsteady flow separation and flow control for the flow over airfoil.

Keywords

74F1076G2576D5576D05Unsteady flowmoving separationaeroelastic structurelift enhancementLagrangian coherent structures
Type
Research Article
Information
Communications in Computational Physics , Volume 16 , Issue 3 , September 2014 , pp. 699 - 717
Copyright
Copyright © Global Science Press Limited 2014

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