Chapter 11

Multielement Airfoils for Wind Turbines

Adam M. Ragheb, Michael S. Selig,    University of Illinois at Urbana-Champaign, Urbana, IL, United States    Email: adam.ragheb@gmail.com, aragheb@illinois.edu

Abstract

The thick root airfoils of modern wind turbines, with current technology designs reaching 45% thickness, are incapable of producing high lift, and as a consequence, the blades are aerodynamically and structurally suboptimal. Additionally, the road-transportable blade length is limited to between 53 and 62 m depending on the specific blade geometry. The use of multielement airfoil arrangements on utility-scale wind turbine blades has the potential to allow for (1) improving aerodynamics near the hub section, (2) improving the structural ...

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