by Paul L. Gay (Author)
This book on wind turbine aerodynamics is the first book in a series of books on wind power by the author. The books are an attempt to present a simplified explanation of wind power technology without sacrificing an in-depth understanding of the subject matter. Wind turbines produce electrical or mechanical power by extracting energy from the wind. Although many early wind turbines relied upon drag forces to produce power, modern turbines rely upon aerodynamic lift forces. Lift forces are generated by airfoils. In this book we will explore the aerodynamic principles that govern how and why airfoils are able to produce lift. We will discuss lift and drag and how wind turbine rotors extract energy from the wind. We will look at airfoil types and some of the characteristics that affect their suitｬability for use on wind turbine rotors. Additionally, we will learn about the effects of blade speed, numbers of blades and blade shape. We will see how power production, the physical limits on wind turbine efficiency and maximum power extraction from the wind are determined.