Measurement and Analysis of Turbodrill Blade Profile Based on Three Coordinate Measuring Machine

The core components of turbodrill are the stator and rotor.Profile measurement for rotor and stator blade is required in the study of the reverse engineering and accuracy test of the stator and rotor.This paper presents a method of contact measurement to measure blade profile through analyzing the structure characteristics of turbodrill’s stator and rotor,and the technique to obtain blade profile by using the mean hydraulic radius as the cutting path to cut off blade shroud,and gives the way to measure profile lines of the suction and pressure surfaces respectively.Based on the coordinates of measured points,an innovative method using the point packet controlling cubic curve manner to fit the blade profile under the fluid flow requirements is put forward.A type of φ127.0 mm turbodrill rotor blade profile was measured by this method,obtaining coordinate values of 196 points of measured blade profile,and based on the coordinates of measured points,blade profile lines were calculated.Case study shows the proposed method is feasible,it can meet the accuracy requirement,and provide technical references for measuring or reverse engineering design of turbodrill’s stator and rotor blades.