Transient analysis of LP rotor from NPP 900MW turbine

Abstract Thermal stress and the contact stress for centrifuge force field during the start up and shut down is very most important for the safety of the turbine which will affect the design life of the turbine. The stress at startup and shut down is much larger than the stress at other conditions. The stress level and the fatigue life are important for safety and economy of the rotor. In this paper, the mechanical properties of the material varying with the temperature are considered. The vapor pressure and temperature at different position of the rotor and at different history are considered to calculate the film coefficient. The two dimensional thermal-mechanical coupled model is used to calculate the transient temperature field and stress field. The three dimensional contact model is used to calculate the stress field and contact stress under the centrifuge loading conditions.