摘要
本文针对实际服役的汽轮机转子,指出了仅以热疲劳法分析计算转子寿命的局限性,提出对处于高温运行状态下的转子,必须从热疲劳、蠕变和高温下裂纹扩展三个方面综合分析,进行损伤累积、寿命计算,从而科学地全面地制定转子的实用寿命消耗曲线。 在汽轮机实际起停过程中,蒸汽温度的波动在转子上产生复波应力。本文不仅提出了在热疲劳寿命分析与裂纹扩展寿命分析中采用“复波分离计算法”的观点,而且给出了裂纹扩展量函数、通过积分计算裂纹扩展寿命的数学方法,并对方法的可靠性加以论证。 在以上理论的指导下,文中以125MW汽轮机高压转子弹性槽底为分析研究对象,计算了两班制运行下相应的寿命消耗,结论列于文中。
This paper, directing towards an actual steam turbine rotor on duty, indicates the limitation of rotor life calculation based on only thermal fatigue method and puts forward that, for rotors operating at high temperature, damage cumulation and life calculation have to be analyzed comprehensively from three aspects of thermal fatigue, creep and crack growth at elevated temperature in order to work out applicable life consuming curve of rotors scientifically and reasonably.During a practical start up-shut down of steam turbines, the fluctuation of steam tem-perature causes "multi-wave" stress on rotor. The paper not only establishes a concept of "Range-Pair counting method" in analysis of thermal fatigue life and crack growth life, but also gives a mathmatical approach to calculate by integral the crack growth life which is based on a function of crack growth amount. The reliability of the method is erpoundecl and proved either.Under the direction of above idea, the life comsumption of HP rotor 125MW steam turbine in two-shift operation is analyzed and estimated. The results of calculation are presented in the paper.
出处
《中国电机工程学报》
EI
1987年第2期-,共8页
Proceedings of the CSEE
