Experimental Study of Free Stream Turbulent Effects on Dynamic Stall of Pitching Airfoil by Using Particle Image Velocimetry

Tzong Shyng Leu; J.M. Yu; C.C. Hu; J.J. Miau; S.Y. Liang; J.Y. Li; J.C. Cheng; S.J. Chen

doi:10.4028/www.scientific.net/AMM.225.103

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 225Experimental Study of Free Stream Turbulent...

Experimental Study of Free Stream Turbulent Effects on Dynamic Stall of Pitching Airfoil by Using Particle Image Velocimetry

Abstract:

The unsteady flow fields above NACA 0015 airfoil pitching with/without upstream turbulence generator are investigated in a water tunnel by mean of particle image velocimetry (PIV). The turbulence was generated by a square bar mesh situated at the inlet of the test section. The airfoil pitching waveform is performed under the condition calculated from the angle of attack histogram of a vertical axis wind turbine (VAWT). By using PIV, the instantaneous vortex structures above the pitching airfoil can be revealed. It allows us to study the free stream turbulence effects on dynamic stall over an airfoil at pitching waveform the same as VAWT. It is found that the free stream turbulence intensity has significant impacts on the dynamic stall process. The dynamic stall process is delayed to higher incidence angles on increasing the turbulence intensity.

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Periodical:

Applied Mechanics and Materials (Volume 225)

Pages:

103-108

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.225.103

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Online since:

November 2012

Authors:

Tzong Shyng Leu, J.M. Yu, C.C. Hu, J.J. Miau, S.Y. Liang, J.Y. Li, J.C. Cheng, S.J. Chen

Keywords:

Dynamic Stall, Free Stream Turbulence, Pitching Airfoil

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