Blade icing is problematic to the safe and efficient operate of wind turbine. It is important to prevent and remove ice from the blade surface. To invest the characteristics of blade surface icing of wind turbine, wind tunnel tests were carried out on the wind turbine blade with NACA0018 and NACA7715 airfoil. The tests were made in winter. The outside cold air was induced into the wind tunnel, and a water spray was set up before the output of the wind tunnel to supply the icing condition. A CCD video camera was used to record the ice accretion in 20 minutes. By image processing software the icing distributions of the two kinds of airfoils were obtained and analyzed. Furthermore, the icing area increasing rate was also discussed.
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