摘要
为分析汽轮机甩负荷运行时的应力状况,选取某机组高压第一级动叶片和转子轮槽为分析对象,采用有限元法分析在高压蒸汽4个阶段降温冲击下的应力.结果表明,动叶片以及转子材料内应力对温度的变化反应敏感;温度不变时,应力集中处的内应力需要很长时间才能消退并趋于均匀化;在该温度曲线的操纵下,逐步的降温造成应力累加,导致应力峰值呈波浪形且越来越高.
To analyze the stress of steam turbine under load rejection working condition,the first set moving blades and rotor-grooves are taken as the analysis objects,and the stress is analyzed when they are strongly shocked by rapid cooling of high-pressure stream during four stages.The result indicates that the internal stress of moving blade and rotor-groove is sensitive to temperature change;the internal stress at the concentration position takes a long time to regress and then tend to be uniform.Under operation of the temperature curve,the gradual temperature decrease leads to stress accumulation,so it results in the stress peak likes a wave and becomes higher and higher.
出处
《计算机辅助工程》
2011年第2期118-122,共5页
Computer Aided Engineering
关键词
汽轮机
甩负荷
热冲击
应力
低周疲劳
steam turbine
load rejection
thermal shock
stress
low cycle fatigue
