Modelling of heating modes of rotating disks using induction heating

Abstract

Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.

The disks of compressors and turbines of aviation gas turbine engines (GTE) under operating conditions are influenced significant mechanical and thermal loadings. Therefore the modelling of high-speed heating modes and thermostress state of rotating disks and rotors has the importance for increasing the operating time of GTE parts at non-stationary modes. The isothermal and thermal cycle tests of turbine disks with modelling of operational thermal and mechanical loadings are carried out on spin rigs with using induction heating. The methods of thermal cycle tests are developed for modelling of operational high-speed modes of heating GTE disks to reproduce cyclic thermal loading. Authors investigated the dependence of the extra power of internal heat sources in rotating disks versus frequencies of rotation between 10000-70000 r.p.m. in alternating electro-magnetic field. For this purpose the mathematical models are developed for calculation of power characteristics of induction heating system, developed new inductor designs and models of heating modes of rotating disks. The new design of flat inductors allows to raise accuracy of modelling and thermal control of the temperature fields in GTE turbine disks.