超超临界汽轮机转子系统的稳定性计算

The Stability Calculation of Rotor System of Ultra Supercritical Steam Turbines

考虑汽流激振的超超临界汽轮机转子系统的稳定性分析是个较新的课题。采用有限元法,对超超临界汽轮机轴系建模,将转子和不转动的轴承一基础系统作为一个耦合整体处理,开发了耦合计算程序,能够计入汽流激振,使计算更符合机组运行工况。开发的程序可以计算转子各阶模态振型与临界转速,进行稳定性的分析。算例计算的结果表明,方法和开发的程序正确合理,可以为超超临界汽轮机轴系稳定性的判断、结构与参数的设计起到一定作用。

The stability analysis of rotor system of supercritical steam turbines including the steam-excited vibration is a comparatively new subject. Using FEM to model the rotor system of ultra supercritical steam turbine, treating the rotating rotor and static beating-foundation as a coupling whole, the program is compiled. To match the real operation condition of the steam units, steam-excited vibration is included. The program can calculate modal shapes and critical speeds, analyze the stability of the rotor system. One example is given and the result proves that the method and the program are reliable and useful for the design of structures and parameters of ultra supercritical steam turbines.