Study on high precision calculation method of geometric parameters of blade profile

Abstract Two-dimensional blade profile design is the basis of three-dimensional blade modeling. The important parameters reflecting the geometric characteristics of the blade profile are chord length, maximum thickness, inlet and outlet metal angle, installation angle, etc. These parameters are the basis of blade profile design and performance analysis, and it is of great significance to calculate these parameters accurately. Based on the original blade profile data, this paper puts forward a high-precision blade profile parameter extraction method and obtains detailed geometric parameters, including small circle, middle arc and maximum thickness of the blade profile, which lays a foundation for blade profile design and analysis. It is verified that the proposed method has high accuracy and good engineering applicability.