A thick aerodynamic profile with regions of negative lift slope and possible implications on profiles for wind turbine blades

In the high pressure wind tunnel (HochDruckkanal Goettingen [HDG]) of Deutsch–Niederländische Windkanäle—German–Dutch Wind Tunnels (DNW) a 47% thick airfoil‐like symmetrical profile was investigated at a high (3 to 12 million) Reynolds number. As an unusual feature, a negative lift slope dcL/dα <...

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Bibliographic Details
Published inWind energy (Chichester, England) Vol. 24; no. 2; pp. 162 - 173
Main Authors Peter Schaffarczyk, Alois, Arakawa, Chuichi
Format Journal Article
LanguageEnglish
Published Bognor Regis John Wiley & Sons, Inc 01.02.2021
Subjects
Aerodynamics
Airfoil profiles
CFD
Computational fluid dynamics
Computer applications
Fluid dynamics
Fluid flow
High pressure
Hydrodynamics
Negative lift
negative lift slope
pressurized wind tunnel
Reynolds number
thick wind turbine air foil
Turbine blades
Turbines
Wind power
Wind tunnels
Wind turbines
Zero lift
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Summary:In the high pressure wind tunnel (HochDruckkanal Goettingen [HDG]) of Deutsch–Niederländische Windkanäle—German–Dutch Wind Tunnels (DNW) a 47% thick airfoil‐like symmetrical profile was investigated at a high (3 to 12 million) Reynolds number. As an unusual feature, a negative lift slope dcL/dα < 0 close to zero lift has been re‐observed under specific circumstances. We describe the findings and offer some explanations using two‐dimensional (2D) unsteady, transitional computational fluid dynamics. Possible implications for very thick aerodynamic profiles for use on wind turbine blades are discussed.
ISSN:1095-4244
1099-1824
DOI:10.1002/we.2565