Interacting Boundary Layer Methods and Applications

Özdemir, Hüseyin

doi:10.1007/978-3-030-31307-4_11

Handbook of Wind Energy Aerodynamics 2022

DOI: 10.1007/978-3-030-31307-4_11

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Interacting Boundary Layer Methods and Applications

Hüseyin Özdemir

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2024

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Cited by 2 publications

References 46 publications

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Investigation of a novel active flow control technology on the chronology of the dynamic stall of oscillating airfoils at low Reynolds number

Elfeky,

El-Anwar,

El Berry

2024

Wind Engineering

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A numerical investigation is performed to determine the impact of an active flow control technology called the Co-Flow Jet (CFJ) on the chronology of the dynamic stall of oscillating airfoils at low Reynolds numbers. The models were validated by two experimental cases of oscillating airfoils. The modified baseline airfoil was examined at three jet momentum coefficients (Cμ = 0.16, 0.25, and 0.36). The results demonstrated that, when compared to the baseline airfoil, during the oscillation upstroke, CFJ causes a delay in the dynamic stall onset and vortices’ convection. Moreover, during the oscillation cycle’s downstroke, CFJ causes the flow to reattach earlier. that the flow reattached at angle 14.86° down stroke at all studied values of Cμ, while the flow was reattached at angle 9° in the case of the baseline airfoil. The CFJ airfoil produced a significant improvement in lift coefficient and a reduction in drag coefficient.

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Investigation of a novel active flow control technology on the chronology of the dynamic stall of oscillating airfoils at low Reynolds number

Elfeky,

El-Anwar,

El Berry

2024

Wind Engineering

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Development and Measurement of a Very Thick Aerodynamic Profile for Wind Turbine Blades

Schaffarczyk,

Lobo,

Balaresque

et al. 2024

Wind

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We designed 60% thick airfoil to improve the aerodynamic performance in the root region of wind turbine rotor blades, taking into account current constraints. After an extensive literature review and patent research, a design methodology (including the considerations of simple manufacturing) was set up, and extensive 2D- and 3D-CFD investigations with four codes (Xfoil, MSES, ANSYS fluent, and DLR-tau) were performed, including implementation inside a generic 10 MW test-blade (CIG10MW). Comparison with results from Blade Element Momentum (BEM) methods and the estimation of 3D effects due to the rotating blade were undertaken. One specific shape (with a pronounced flat-back) was selected and tested in the Deutsche WindGuard aeroacoustic Wind Tunnel (DWAA), in Bremerhaven, Germany. A total of 34 polars were measured, included two trailing edge shapes and aerodynamic devices such as vortex generators, gurney flaps, zig-zag tape, and a splitter plate. Considerable changes in lift and drag characteristics were observed due to the use of aerodynamic add-ons. With the studies presented here, we believe we have closed an important technological gap.

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Interacting Boundary Layer Methods and Applications

Cited by 2 publications

References 46 publications

Investigation of a novel active flow control technology on the chronology of the dynamic stall of oscillating airfoils at low Reynolds number

Investigation of a novel active flow control technology on the chronology of the dynamic stall of oscillating airfoils at low Reynolds number

Development and Measurement of a Very Thick Aerodynamic Profile for Wind Turbine Blades

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