阀座圆角半径对汽轮机高压阀壳高温蠕变应力的影响  

Effect of Valve Seat Fillet Radius on High-temperature Creep Stress of HP Steam Turbine Valve Housings

作　　者：邓志成[1,2] 杨宇[2] 汪勇[2] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]上海发电设备成套设计研究院,上海200240

出　　处：《发电设备》2010年第6期393-395,共3页Power Equipment

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA04Z429);上海市优秀学科带头人计划资助项目(08XD14227)

摘　　要：采用有限元计算方法分析了稳态额定负荷工况下汽轮机阀座圆角半径对高压阀壳蠕变应力的影响。计算分析结果表明,在蠕变的初期,阀座圆角半径增大时,阀壳蠕变应力明显减小;进入稳态蠕变期后,蠕变应力趋于一个常数;不同阀座圆角半径情况下,稳态蠕变应力差别并不大;改变阀座圆角半径,其他部位蠕变应力基本保持不变。Effect of valve seat fillet radius on creep stress of high-pressure（HP） steam turbine valve housings was analyzed at rated load under steady-state operating conditions.Results show that the creep stress reduces obviously with rising fillet radius during initial period of creeping;the stress keeps nearly constant when the creeping process gets to a steady state,i.e.the creep stress hardly changes with varying fillet radius;when the fillet radius is changed,the steady-state creep stress at other places remains basically unchanged.

关 键 词：汽轮机 高压阀壳 强度设计 阀座圆角半径 高温蠕变 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]