Известия Томского политехнического университета: Инжиниринг георесурсов (Nov 2018)
Development of energy efficient induction system for repair-restoration technologies of disks of gas turbine engines
Abstract
The relevance of the discussed issue is caused by the economic need to improve the reliability and service life of parts and components of gas turbine engines widely used as a drive for gas pumping units in the oil and gas industry. Disks and wheels of turbines and compressors belong to the most critical elements of gas turbine engines, which experience critical loads during operation. The quality of the surface layer has a significant effect on the endurance of these parts. To increase the service life of parts, various methods of surface hardening are used. One of the methods for improving the quality of the surface layer is thermoplastic hardening, which involves two steps: heating to a predetermined temperature and subsequent spray cooling. This research is devoted to the solution of the problem of applying an efficient, environmentally friendly method of local heating of the machined surfaces of a disk during thermoplastic hardening. The main aim of the study is to develop the mathematical models of electromagnetic and thermal processes for induction heating of products of complex geometric shape, taking into account the nonlinear dependence of the electro- and thermophysical characteristics of the heated metal of the article on temperature for calculating the structural and regime parameters of the induction heating system. Methods. To solve the interconnected electrothermal problem the authors have used the methods of the theory of electromagnetic field and thermal conductivity, methods of mathematical modeling. Numerical simulation was carried out using the finite element method in modern engineering packages. Results. The authors developed the complex of electromagnetic and thermal models of induction heating of products with complex shape, designed to solve the problems of design and automatic control of specialized heating installations for repair technologies of rotors of gas turbine engines; proposed the algorithm for determining the design and regime parameters of an induction system, including a sequential calculation of electromagnetic and thermal fields, taking into account their mutual influence and the presence of restrictions on the maximum permissible temperatures.
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