Model of Analysis of the Results of Geometry Scanning of Turbine Nozzles

Abstract

Traditionally, the blades of gas turbine engines are assembled manually using special techniques (sorting by mass or by several geometric parameters). The use of manual assembly leads to the need to perform reassembly of units and is characterized by non-optimal operating parameters achieved. The data obtained from the scanners when monitor-ing the geometry of the blades can be used to improve the quality of the assembly processes of compressors and engine turbines. In particular, parts can be picked based on key parameters. The results of the work will automate the receipt of such parameters. The paper presents a mathematical model for performing a computer calculation of the flow area of turbine nozzles. The model is used to work with objects of *.stl format when processing data after scanning. With the use of the developed model, the calculations will not depend on the qualifications of the controller, and the proposed approach will not require a unique adjustment and expensive repair and storage of standards for all standard sizes of nozzles. The calculation was carried out in three sections, which increases the accuracy of the calculations while reducing the complexity and cost of measurement. An increase in the number of sections practically does not increase the complexity of calculations, so there are no significant restrictions on the performance of virtual measurements in four or more sections. The model is implemented in the mathematical package MATLAB. The model was tested by the example of processing the STL model of the sector of the turbine nozzle blades.