Phase-locked PIV studies on an oscillating airfoil

Mukund, R and Venkatakrishnan, L and Madhavan, KT (2008) Phase-locked PIV studies on an oscillating airfoil. In: Proceedings of the 12th Asian Congress of Fluid Mechanics, 18-21 Aug 2008, Daejeon, Korea.

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    Abstract

    The study of oscillating airfoils is of interest in order to gain a deeper understanding of the unsteady flow aerodynamics present in such flows as well as the dynamic stall mechanism occurring at high incidence angles of the airfoil. Flow field measurements were conducted using phase locked 2D PIV on an oscillating airfoil at low speeds. The measurements were made at different phase angles during both up stroke and down stroke of the airfoil yielding statistically significant number of velocity fields. The phase-averaged velocity field clearly shows the formation of the dynamic vortex, its growth and its shedding. An interesting feature is that the measurements reveal a secondary vortex at the maximum angle. The spatial correlation of vorticity was calculated from the phase-averaged velocity field data and the results show strong negative correlation with the reference point which decreases with increasing incidence up to the maximum angle and reappears during the downstroke. The reappearance of the ensemble-averaged correlation in the separated region indicates that the flow field is not totally irreproducible as was indicated by earlier studies.

    Item Type: Conference or Workshop Item (Paper)
    Uncontrolled Keywords: Oscillating airfoil;Particle image velocimetry (PIV)
    Subjects: AERONAUTICS > Aeronautics (General)
    Division/Department: Experimental Aerodynamics Division, Experimental Aerodynamics Division, Experimental Aerodynamics Division
    Depositing User: Ms. Alphones Mary
    Date Deposited: 06 Apr 2010
    Last Modified: 17 Jun 2010 15:27
    URI: http://nal-ir.nal.res.in/id/eprint/5276

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