Experimental Study of Free Stream Turbulent Effects on Dynamic Stall of Pitching Airfoil by Using Particle Image Velocimetry-Reference-Cited by-同舟云学术

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

Published:2012-11 Issue: Volume:225 Page:103-108
ISSN:1662-7482
Container-title:Applied Mechanics and Materials
language:
Short-container-title:AMM

Author:

Leu Tzong Shyng¹,Yu J.M.¹,Hu C.C.²,Miau J.J.³,Liang S.Y.¹,Li J.Y.¹,Cheng J.C.⁴,Chen S.J.⁵

Affiliation:

1. National Cheng Kung University

2. Kao Yuan University

3. National Cheng-Kung University

4. National Formosa University

5. Temple University

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.

Publisher

Trans Tech Publications, Ltd.

Link

https://www.scientific.net/AMM.225.103.pdf

Reference7 articles.

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2. P. Wernert, G. Koerber, F. Wietrich, M. Raffel, and J. Kompenhans, Demonstration by PIV of the non-reproducibility of the flow field around an airfoil pitching under deep dynamic stall conditions and consequences thereof, Aerospace Science and Technology, Vol. 2, pp.125-135. (1997).

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