3D Measurement and Surfaces Reconstruction Modelling of Large Size Blade of Axia Flow Type

The digital model is the base of blade type fluid machinery digitized design and manufacture.According to the large axial flow type hydraulic turbine characteristics,reverse technology of large axial flow turbine blade surface reconstruction method is presented.Three coordinate measuring machine is adopted to obtain the surface data of the blade model.The reconstruction of 3D geometrial surfaces of blade were realized through such processing procedures as smoothing and sampling point cloud data,gridding of the point data,extraction of surface feature,partition of surfaces and directly fitting surface partition.This method which realizes the rapid and precise modeling of hydroturbine blade,could serve as a basis for the further digital design and manufacturing research.