论文部分内容阅读
应用黄仙、倪维斗在《动力工程》第１５卷第６期提出的“复频法”建立了转子动态热应力（热或冷冲击问题）的精确数学模型。该模型改变了以往的转子热应力研究中，不论是有限元法还是解析法，均将问题作“拟静态”处理的思想。更深入地分析了大型汽轮机转子的热应力问题，并以离散相似法对大型汽轮机转子的动态热应力进行了数字仿真。结果表明转子动态热应力不能由“拟静态”热应力表示。在我国电网峰谷差日益扩大，大批２００ＭＷ机组参与调峰运行的情况下，转子动态热应力精确数学模型的建立，为统筹解决调峰机组的灵活、安全性提供了有力的数学工具。
Application Huang Xian, Ni Weidou The “complex frequency method” proposed in “Power Engineering” Vol. 15, No. 6 established an accurate mathematical model of the rotor dynamic thermal stress (thermal or cold impact problem). The model changes the previous study of thermal stress in the rotor, both the finite element method and the analytical method, all of which have the problem of “quasi-static” treatment. The thermal stress of large-scale steam turbine rotor is analyzed in depth. The dynamic thermal stress of large-scale steam turbine rotor is simulated by discrete similarity method. The results show that the rotor dynamic thermal stress can not be expressed by “quasi-static” thermal stress. With the widening peak-valley difference in China’s power grid and the large number of 200MW units participating in the peak-shifting operation, the establishment of a precise mathematical model of rotor dynamic thermal stress provides a powerful mathematical tool for overall coordination of the flexibility and safety of the peaking unit.