中文摘要：

为准确计算汽轮机转子在启、停机过程中的热应力,建立了转子瞬态温度场、应力场分析的热固双向耦合轴对称计算模型.该模型在考虑转子温度场对应力场影响的同时,也考虑了应力场对温度场的影响.采用热固双向耦合有限元模型计算了某超超临界660 MW超高压转子的瞬态温度场和热应力场,并研究了热固双向耦合和单向模型计算结果的差异.计算结果表明：在转子启动过程中,温度与变形之间的耦合作用会随主蒸汽和转子表面温差增大而增强,当转子表面初温与主蒸汽温差为280℃时,两种模型计算出的转子最大热应力相差6.6％.因此,在转子表面热冲击较大的情况下,应选择热固双向耦合模型进行转子热应力计算.

英文摘要：

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.