Experiment and analysis of aerodynamic performance for CAS thin airfoils used of wind turbine blades

CAS-W1-150/180/210 thin airfoils were specially designed for outboard section of wind turbine blades. Based on test in wind tunnel, the repeatability of measurement accuracy and the influence of various factors on aerodynamic performances were analyzed. Twice test data indicated good repeatability for lift coefficient, but bad for drag coefficient and lift-to-drag ratio because of the unstable air pressure in wake rake and very small drag value. Comparing these test data with the data of foreign airfoils shows that at least three CAS airfoils have a higher maximum lift coefficient and well-matched in lift-to-drag ratio except CAS-W1-180. In addition, the influences of Reynolds number, roughness and geometric parameters on lift characteristic were also investigated based on the experiment results of CAS airfoils on aerodynamic performance is proposed, and some valuable conclusions are obtained.