主蒸汽温度和压力波动对汽轮机转子蠕变疲劳损伤的影响

doi:10.16183/j.cnki.jsjtu.2019.02.001

摘要/Abstract

摘要： 采用Abaqus有限元软件建立了某GW(百万千瓦)级超超临界汽轮机高压转子的轴对称有限元模型，加载基于电厂实际运行的主蒸汽温度和压力的边界条件，以分析转子在稳态运行过程中的力学行为；采用Lemaitre连续损伤力学模型分析高压转子在实际运行过程中的蠕变疲劳损伤，并与不考虑主蒸汽温度和压力波动条件下的计算结果进行对比.结果表明：主蒸汽温度和压力的波动对转子的热力状态产生影响；转子的温度和应力随着主蒸汽温度和压力的波动而变化；在转子进汽口位置(A点)，主蒸汽温度和压力波动下的蠕变疲劳损伤值超过主蒸汽温度和压力恒定条件下的2倍.

关键词: 汽轮机, 温度, 压力, 波动, 高压转子, 蠕变疲劳损伤

Abstract: The finite element software Abaqus is adopted to construct an axisymmetric finite element model of a high-pressure rotor of a 1000MW ultra-super critical steam turbine. The boundary conditions are determined based on the in-service steam temperature and pressure data from the power plant. After finite element calculation, the rotor mechanical behavior in the steady operation is analyzed, and the Lemaitre continuum damage model is further applied to study the creep-fatigue damage of the rotor. In addition, the calculating results without consideration of the steam temperature and pressure fluctuations are used for comparison. The results show that the fluctuations of the steam temperature and pressure exert a great influence on the thermo-mechanical behavior of the rotor; the temperature and stress of the rotor keep changing with the steam temperature and pressure; the creep-fatigue damage in the inlet area under the in-service conditions is more than double that under constant steam temperature and pressure conditions.

Key words: steam turbine, temperature, pressure, fluctuations, high-pressure rotor, creep-fatigue damage

中图分类号:

TK 263.6

赵乃龙，王炜哲，刘应征. 主蒸汽温度和压力波动对汽轮机转子蠕变疲劳损伤的影响[J]. 上海交通大学学报（自然版）, 2019, 53(2): 127-133.

ZHAO Nailong,WANG Weizhe,LIU Yingzheng. Influence of Main Steam Temperature and Pressure Fluctuations on the Creep-Fatigue Damage of a Steam Turbine Rotor[J]. Journal of Shanghai Jiaotong University, 2019, 53(2): 127-133.

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