Accurate calculation method of the throat area for turbine guide vanes based on the point cloud

The throat area for turbine guide vanes plays an important role in the smooth operation and overall performance of the turbine engine and is an important parameter for the design and assembly of the aeroengine. However, the accurate measurement and evaluation of the throat area has always been a difficult point in the field of geometry measurement. With the advantage of non-contact measurement of the three-dimensional optical scanner, an accurate calculation method of the throat area for turbine guide vanes based on the point cloud is presented. The throat area of the double guide vane is calculated by using the method of truncation plane, and the throat area for turbine guide vanes is measured and evaluated. Compared with the existing methods, the evaluation result is closer to the actual throat area for turbine guide vanes. Finally, the method of this paper was validated using the designed calibration model, and the error rate is less than 0.02%, which achieves good expected results. The method presented in this paper has the advantages of high measurement accuracy, high consistency of calculation results, and avoiding scratches on the blade surface, which helps to improve the efficiency of measuring and calculating the throat area.