Shape Evaluation Method for Leading and Trailing Edges of Aero-engine Blade

Abstract The shape of the leading and trailng edges of aero-engine blades has a significant influence on its aerodynamic performance. At present, the method of manual inspection based on the standard pattern is mainly used to analyze the shape of the leading, and trailing edges, which has the problems of low efficiency, poor repeatability and inconsistent evaluation results. An automatic shape evaluation method based on eigenvalues is proposed in this paper. Firstly, the blade profile and its mean camber line are segmented and fitted. Then, evaluation indexes are given for the five unqualified edge shapes respectively according to the curvature characteristics and profile variation characteristics. Finally, the shape of the blade edge is evaluated with the eigenvalues calculated. Experiments show that the proposed method can realize the automatic shape evaluation of blade leading and trailng edges, and can adapt to different types of blades and different acceptance standards, which effectively improves the efficiency of blade profile quality inspection.