The increasingly serious global energy crisis has promoted the rapid development of new energy, among that, wind energy has become one of the most popular new energy sources.

In recent years, the vertical axis wind turbine has been widely used, and the blade is one of the key components, its good aerodynamic performance ensures that the wind turbine can obtain a higher wind energy utilization rate. Perfect design structure is not only can guarantee of the safety and normal operation of the turbine, but also to minimize the cost of blade production.

The blade structure of vertical axis wind turbine can be generally divided into resistance type (S shape) and lift type (H shape and Darrieus shape, etc.), and the number of blades can also be single blade, double blade, three blade or multiple blade.