高精度测量燃气轮机叶片前缘的三维轮廓

High-precision measurement for the three-dimensional profile of gas turbine blade's leading edge

为了解决高精度测量燃气轮机叶片前缘三维轮廓的难题,提出了一种基于球阵列标定检验方法,直接对金属表面的叶片前缘三维轮廓进行高精度测量的相位轮廓测量系统.通过多角度数据融合算法和非线性最小二乘的递归算法,最后高精度测量出叶片前缘三维轮廓,对叶片前缘16个剖面进行拟合,得出了叶片前缘半径和前缘圆心.结果显示:叶片前缘测量系统、方法和算法的综合误差为±0.03mm.此实验装置和方法测量效率高、精度高,将叶片测量和模型化技术推进了一步.

In order to solve the bottleneck problem of high-precision measurement for the gas turbine blade＇s leading edge, a high-precision measuring device using phase measurement profilometry was designed for the three-dimensional measurement for the metal gas turbine blade＇s leading edge, based on the calibration accuracy improved by a kind of examining ball array. By the means of designing a multiple view data fusion algorithm and a recursive algorithm of nonlinear least squares, the three-dimensional profile of the blade＇s leading edge was measured with high precision, and the radii and centers of blade＇s leading edge from sixteen sections of blade＇s leading edge were fitted finally. The result shows that the comprehensive error of the blade＇s leading edge measuring system, methods and algorithms is ±0.03 mm. The experimental device and methods are of high efficiency and accuracy, contributing to the progress for blades measurement and modeling techniques.