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Combined rotor is the core part of gas turbine and works in high temperature and high rotating speed environment in a long-term,creep bending of the combined rotor will make great effects on the gas turbine's performance. To study the creep bending properties of gas turbine's combined rotor considering the contact stiffness, in this paper, virtual material layer was used to equal the stiffness of contact interface when building the finite element model of combined rotor, and choosed the Norton creep constitutive model to carry out heat-solid coupling analysis with the FEA software ansys under a given temperature and stress fields. Firstly, the creep effect of balanced combined rotor of a 300MW gas turbine was calculated, got the main creep area of combined rotor and the creep quantitative data changing with time. Then, the relationship between creep bending amount of combined rotor with eccentric mass and time was researched.Results show that, the creep mainly occurred on shaft between twelfth wheel of the compressor and third wheel of the turbine; when the combined rotor got a eccentric mass, it would bend, and with time went on, the amount of eccentricity increased gradually, the bending rate also increased, and the bending rate of the 17th wheel of the compressor was the highest. The results of this dissertation will support reference for structure design and vibration analysis of the combined rotor.

Creep Bending Analysis of Combined Rotor for Gas Turbine Considering Contact Stiffness