A Metrological Method of the Profile Camber Angle of Aeroengine Blades
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ORIGINAL PAPER
A Metrological Method of the Profile Camber Angle of Aeroengine Blades X.-Z. Li1, Z.-Y. Shi2*, K. Li2 and Y.-K. Li2 1
Hebei Key Laboratory of Safety Monitoring of Mining Equipment, College of Mechanical and Electrical Engineering, North China Institute of Science and Technology, Sanhe 065201, China
2
Beijing Engineering Research Center of Precision Measurement Technology and Instruments, College of Mechanical Engineering, and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China Received: 01 February 2019 / Accepted: 24 June 2020 Metrology Society of India 2020
Abstract: The profile camber angle is a key influence parameter on the aerodynamic performance of blades, the measurement of the profile camber angle is of great significance to the optimization design and the quality control for blades. In order to solve the problems in adaptability and accuracy of existing measurement methods, a form-free high-precision metrological method of the profile camber angle of blades is proposed in the study, and the theoretical model, the measuring principle and the key technologies of the method are discussed in detail. The coordinate data of the blade profile are measured accurately in form-free mode with a high-precision laser probe system based on the depth control of field, and the measuring profile and the mean camber line are extracted based on the methodology of high-order polynomial least squares fitting. Thus, the high-precision measurement of the profile camber angle of blades is achieved. The research results show that the comprehensive accuracy of coordinate measurement reaches 10 lm level, and the measurement uncertainty of the profile camber angle is less than 0.15, thus can meet the measuring requirements of aero-turbine blades with first precision grade. The method presented in the paper has advantages of form-free, high-precision and simple algorithm, and can solve the problems of high-precision measurement and evaluation for the profile camber angle of aeroengine blades primely. Keywords: Aeroengine blades; Profile camber angle; Depth control of field; High-order polynomial fitting; Precision measurement 1. Introduction Geometric parameters of the blade are important indexes for the definition and characterization of the blade form, which play important roles in the aerodynamic performance and safety of blades. The measurement of geometric parameters is an important foundation for the evaluation and control of the blade quality. At present, the measuring technologies for conventional parameters of blades such as the profile chord length, the profile thickness and the airfoil height are relatively consummate, and the parameter identification algorithms are more mature [1–3]. However, the measurement and evaluation methods of the profile camber angle are seldom studied, which remain challenges.
*Corresponding author, E-mail: [email protected]
The profile camber angle is a characteristic parameter for the evaluation of blade flection level, which has
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