To accurately estimate the thermal stress of rotor during processes of steam turbine start-up and shut-down
an axisymmetric thermo-structural coupling model of rotor is established. The model considers the effect of the temperature field on the stress field
and the effect of stress field on the temperature field at the same time. The transient temperature field and thermal stress field of a high pressure rotor for a 660 MW steam turbine are calculated with thermo-structural coupled finite element method. The calculated results from the coupled model and from uncoupling model are compared. It indicates that the coupling effect between temperature and deformation enhances with increasing temperature difference between the steam temperature and the surface temperature of the rotor in star-up process. When the temperature difference reaches 280 ℃
the difference of maximum thermal stress with two models approximately gets 6.6%. Therefore
in the case of higher rotor surface heat shock
the thermo-structural coupled model ought to be chosen to calculate transient thermal stress of rotor.
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