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Author ORCID Identifier
Open Access Dissertation
Doctor of Philosophy (PhD)
Year Degree Awarded
Month Degree Awarded
J. Blair Perot
Aerodynamics and Fluid Mechanics
As a result of insects or other environmental fouling, surface roughness on wind turbine blades can reduce power output significantly. Superhydrophobic surfaces, though possibly a passive, cost-saving, answer to the problem of ice accretion on wind turbine rotors in cold climates, may alter turbulence development in the blade boundary layer similar to environmental roughness. This work uses an equivalent sand grain extension to the Turbulent Potential model to computationally assess the aerodynamic effects of surface roughness on the s809 airfoil, including a representational superhydrophobic surface. Rough surface boundary layer theory, application of the equivalent sand grain method, roughness parameter correlation, and wind turbine aerodynamic computational approaches are discussed. Modifications to the Turbulent Potential model including turbulence Reynolds number dependence are addressed. An altered version of the Turbulent Potential model is proposed using an elliptic damping equation in the pressure strain term. Validation of Turbulent Potential model changes is demonstrated by comparison to multiple direct numerical simulations of Moser et al., the impinging jet of Cooper et. al, and the Ohio State University wind tunnel experiments of the s809 airfoil with both a smooth and rough leading edge.
deVelder, Nathaniel B., "ROUGH AIRFOIL SIMULATION FOR WIND TURBINE APPLICATIONS" (2020). Doctoral Dissertations. 1820.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.