Numerical Investigation Of Dynamic Stall
Phenomenon On A Plunging Airfoil
Author(s)
F. Ajalli & M. Mani
Abstract
The unsteady separated turbulent flow around an oscillating airfoil plunging in a
sinusoidal pattern in the regime of low Reynolds number is investigated
numerically, employing the URANS approach with advanced turbulence model,
k-ωSST transitional. A comparison with experimental data shows that the
Transition SST model is capable of predicting the flow characteristics for the
increasing cycle while the main difficulty lies in the accurate modeling of the
complicated separated flows during the decreasing stroke. The flow development
of the dynamic stall is also discussed.
Keywords: dynamic stall, plunging airfoil, k-ωSST transitional model.
1 Introduction
Dynamic stall has been widely known to significantly affect the performance of a
large variety of fluid machinery, such as helicopters, highly maneuverable
fighters, gas turbines, and wind turbines. It is well recognized that the dynamic
stall process can be categorized into four key stages, i.e. attached flow at low
angles of attack, development of the leading edge vortex (LEV), the shedding of
the LEV from the suction surface of the blade and the reattachment of the flow
[1]. Numerous experimental and computational investigations [2–5] have shown
that the unsteady flow can be separating or reattaching over a large portion of the
upper surface of the oscillating airfoil and that the predominant feature of the
dynamic stall is the formation and rapid convection over the upper surface of the
Keywords
dynamic stall, plunging airfoil, k-ωSST transitional model
Related Book
Other papers in this volume
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