某型核电汽轮机次末级叶片失效原因分析及优化改型设计  

Root Cause Analysis of Failure and Optimization Design of L-1 Blade for Nuclear Power Plant Steam Turbine

作　　者：管继伟[1] 李宇峰[1] 王梅英[1] 李庆[1] 刘长春[1] 

机构地区：[1]哈尔滨汽轮机厂有限责任公司,哈尔滨150046

出　　处：《汽轮机技术》2015年第6期409-410,421,共3页Turbine Technology

摘　　要：介绍了某型核电汽轮机次末级叶片的失效情况,并根据失效叶片断口分析和动频测量试验结果分析了叶片失效的原因。针对叶片失效的原因提出了优化设计方案,优化型叶片采用了能够提高结构阻尼的凸台拉筋整圈连接结构,并通过调频试验使叶片的共振转速避开2 820r/min^3 090r/min,以保证优化型叶片的安全运行。Root cause of failure of L - 1 blade for nuclear power plant steam turbine is investigated based on rupture section analysis and frequency measurement result, thereby optimization design featured by mid-span stub connection member has been proposed. The redesigned blade are continuously coupled by blade untwist＇due to centrifugal force, so vibration control and increased structure damping are provided. The optimization blade was well tuned in order to have eigen-frequencies safely away from possible excitation, ie. 2 820r/min - 3 090r/min.

关 键 词：叶片失效 疲劳断裂 谐波共振 调频试验. 

分 类 号：TK263.3[动力工程及工程热物理—动力机械及工程]