Article(id=1221425789577384258, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1221425781750808678, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202207178, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1657036800000, receivedDateStr=2022-07-06, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1769140201229, onlineDateStr=2026-01-23, pubDate=1674576000000, pubDateStr=2023-01-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1769140201229, onlineIssueDateStr=2026-01-23, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1769140201229, creator=13701087609, updateTime=1769140201229, updator=13701087609, issue=Issue{id=1221425781750808678, tenantId=1146029695717560320, journalId=1210938733613449225, year='2023', volume='52', issue='1', pageStart='1', pageEnd='182', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1769140199363, creator=13701087609, updateTime=1769145231708, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1221446888994292213, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1221425781750808678, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1221446888994292214, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1221425781750808678, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=158, endPage=164, ext={EN=ArticleExt(id=1221425791418683761, articleId=1221425789577384258, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Reason analysis on typical failures of low-pressure second last stage moving blades of large scale steam turbine before and after optimization, columnId=1211002409397129992, journalTitle=Thermal Power Generation, columnName=Power generation technology forum, runingTitle=null, highlight=null, articleAbstract=

Blade fractures and cracks occurred on low pressure second last stage moving blade of a steam turbine before and after the blade optimization. In order to find out the cause of this type blade failures and prevent subsequent reoccurrence, the blade failure, operating parameters and historical records were checked, and the materials and fractures of some failed blades were analyzed through physical and chemical inspection. Moreover, the centrifugal stress of the blade and the vibration characteristics of the gear train before and after optimization were numerically analyzed by finite element method. The results show that, the blade fracture is a high peripheral fatigue fracture. Before optimization, the main reason for cracks and fractures at the connection transition between the top of the inner cambered surface and the shroud on the steam outlet side of the blade is that the blade has a large torsional recovery under working conditions, resulting in severe compression of the shroud, and stress concentration and fatigue damage occur at the connection transition between the top of the inner cambered surface and the shroud on the steam outlet side. The unreasonable design of blade root structure is the main factor for high cycle fatigue cracking of blade root, while the vibration of the sixth pitch diameter of the first stage of blade impeller system falling into the "3-coincide point" resonance area is the secondary factor for blade failure. After optimization, the main reason for the fracture is the unreasonable design of the blade root structure, and the vibration of the eleventh pitch diameter of the second stage of the blade impeller system falling into the "3-point" resonance area is the secondary factor causing the blade root failure.

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某型汽轮机低压次末级动叶片优化前后均出现了次叶片断裂和裂纹故障问题，为了查明该型叶片故障原因以防止后续再次发生，对叶片故障情况、运行参数及历史记录等进行检查，对部分故障叶片材料和断口进行理化检验分析，并采用有限元法对优化前后叶片离心应力和轮系振动特性进行数值分析。结果表明：叶片断口为高周疲劳断裂；优化前叶片出汽侧内弧面顶部与围带连接过渡处产生裂纹并断裂的主要原因是工作状态下叶片产生较大的扭转恢复，使围带发生严重挤压，在出汽侧内弧面顶部与围带连接过渡处产生应力集中和疲劳损伤，叶根结构设计不合理是叶片叶根发生高周疲劳开裂的主要因素，而叶片叶轮系统6节径1阶振动落入“三重点”共振区是叶片故障的次要因素；优化后叶片叶根断裂的主要原因为叶根结构设计不合理，而叶片叶轮系统11节径2阶振动落入“三重点”共振区是叶片叶根故障产生的次要因素。

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张永海（1977），男，硕士，高级工程师，主要研究方向为汽轮机部件故障原因分析及安全评估等，zhangyonghai@tpri.com.cn。

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张永海（1977），男，硕士，高级工程师，主要研究方向为汽轮机部件故障原因分析及安全评估等，zhangyonghai@tpri.com.cn。

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