摘要
流体交变载荷产生的动应力是水轮机叶片产生裂纹的重要因素,严重影响了电站的安全生产和机组的稳定运行.本文通过加载交变动应力的瞬态强度分析,研究了缺陷叶片的动应力幅值及缺陷位置处的应力集中现象,量化出缺陷叶片在缺陷处的应力集中数值.本文在对比正常叶片和缺陷叶片之间存在的固有频率差异前提下,通过CFD数值计算和FEM强度分析,获得了两种叶片出现最大动应力时刻的危险点,并对比了它们动应力幅值差异.
The dynamic stress produced by fluid alternating load is the important factor of appearing blade cracks, which seriously affected the station safety and the stable operation of the unit.Based on analyzing the transient intensity of loading alternating dynamic stress, the dynamic stress amplitude of the defect blade and stress concentration phenomenon of defect location are studied.The stress concentration values of the defects at the defect turbine blade is calculated.Based on comparing the natural frequency difference between normal blade and defect blade and through CFD numerical calculation and intensity analysis of FEM, the dangerous points of maximum dynamic stress on this two kinds of blades appeared and the dynamic stress amplitude difference between them is compared.
出处
《江西水利科技》
2015年第1期30-34,共5页
Jiangxi Hydraulic Science & Technology
关键词
轴流叶片
动应力
缺陷
动态特性
Axial-flow turbine blade
Dynamic stress
Defect
Dynamic behavior
