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Title: Proper-orthogonal-decomposition study of turbulent near wake of S805 airfoil in deep stall
Authors: Wu, Yanhua
Tang, Zhanqi
Yang, Shaoqiong
Skote, Martin
Tang, Hui
Zhang, Ge
Shan, Yong
Keywords: Stall Delay
Proper Orthogonal Decomposition
Issue Date: 2017
Source: Wu, Y., Tang, Z., Yang, S., Skote, M., Tang, H., Zhang, G., et al. (2017). Proper-orthogonal-decomposition study of turbulent near wake of S805 airfoil in deep stall. AIAA Journal, 55(6), 1959-1969.
Series/Report no.: AIAA Journal
Abstract: A proper-orthogonal-decomposition analysis was performed on the turbulent flow in the near-wake region of an S805 airfoil in deep stall at an angle of attack of 30 deg. The flow was measured using tomographic particle image velocimetry at a Reynolds number of 4600. Instantaneous turbulence structures, which were significant contributors to the first two proper-orthogonal-decomposition modes, were studied. These structures included the large-scale Kármán vortex and small-scale shear-layer vortices that were interacting with the Kármán vortex. An interesting correspondence was observed between the rotational vectors in proper-orthogonal-decomposition modes 4 and 5 and the locations of the leading-edge shear-layer vortices in the flowfields, which were major contributors to these two modes. Similarity was found in the autospectral functions computed from the velocity fields, which were significant contributors to the first five proper-orthogonal-decomposition modes. The wavelengths corresponding to the peak values of autospectral functions could be related to the size of the induced flows by the Kármán vortex and the streamwise spacing of the shear-layer vortices.
ISSN: 0001-1452
DOI: 10.2514/1.J055563
Rights: © 2017 American Institute of Aeronautics and Astronautics, Inc. This is the author created version of a work that has been peer reviewed and accepted for publication by AIAA Journal, American Institute of Aeronautics and Astronautics, Inc. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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