Parameter extraction of featured section in turbine blade inspection

As a widely used part in turbomachinery, the inspection of free-form shaped turbine blade is a very critical and tough work. Based on the parameter evaluation idea, the aim of this study is to develop methods for extracting key parameters of a turbine blade, which is probably the most important in the whole inspection process. After analyzing the definition, new extraction methods of several section parameters are presented in this paper, including chord length, leading/trailing edge and twist of airfoil surface. The proposed algorithms are developed and implemented using C++ language and OpenGL. Some case studies are investigated to validate the approach.