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Fifth International Symposium on Turbulence and Shear Flow Phenomena
August, 27-29, 2007, Technische Universität München, Munich, Germany

DOI: 10.1615/TSFP5

HAIRPIN STRUCTURES IN A TURBULENT BOUNDARY LAYER WITH STRONG ADVERSE PRESSURE GRADIENT

pages 41-46
DOI: 10.1615/TSFP5.60
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RESUMO

Coherent structures in the outer region of a turbulent boundary layer subjected to a strong adverse pressure gradient have been studied using particle image velocimetry (PIV). The experimental set-up is designed to achieve flow conditions corresponding to trailing-edge stall of an airfoil. Large sets of instantaneous velocity fields are acquired by PIV in streamwise-wall-normal planes at three different streamwise locations. Signatures of hairpin vortices are found in all the fields and hairpin packets occur in the majority of them. The essential features of the hairpins and hairpin packets are similar to those found in zero-pressure-gradient turbulent boundary layers. The hairpin vortices are however slightly more inclined with respect to the wall in the present flow, and the upward growth of the hairpin packets in the streamwise direction is more important. The characteristics of the spanwise vortices are also documented.

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