第 2 1 卷第3 期
2014 年 6 月
工程设计学报
Chinese Journal of Engineering Design
Vol. 21 No. 3
Jun. 2014
D O I : 1 0 . 3785/j. issn. 10 0 6 - 7 54X. 2014. 03. 008
拉杆松弛对燃气轮机组合转子性能退化的影响
苏永雷王艾伦h 2 ,李雪 鹏2 ,高思霄2 ,张营营2
(1.中南大学高性能复杂制造国家重点实验室,湖南长沙410083;
2.中南大学机电工程学院,湖南长沙410083)
摘 要 :组合转子作为燃气轮机的核心部件,其性能退化将对整个燃气轮机的性能产生重大影响,揭示组合转子性
能退化机理并进行退化特征分析对燃气轮机的可靠运行具有重要意义.为揭示组合转子结构损伤导致的性能退化
机理,考虑拉杆螺栓在高温下的应力松弛,得到基于时间历程的拉杆预紧力变化规律;通过拉杆预紧力定义组合转
子退化量指标,评估组合转子的退化程度;十算轮盘界面接触刚度,进行考虑接触界面的组合转子动力学分析,进
而得到燃气轮机组合转子不同退化量下的动力学特征.结果表明:温度是影响组合转子性能退化的敏感参数;拉杆
松弛导致组合转子固有频率漂移,组合转子前3 阶固有频率的降低率相差很小,并在一定范围内与退化量呈线性
关系.
关键词 :拉杆松弛;且合转子;退化量;接触刚度;固有频率
中图分类号:T K 261 ; T H 113. 1 文献标志码:A 文章编号:1006-754X(2014)03-0245-06
Effect of rod relaxation upon performance degradation of
combined rotor for gas turbine
S U Yong-lei1,2 ,W A N G Ai-lun1,2 ,VI X ue -p en g2 ,G A O Si-xiao2 ,Z H A N G Y m g - y m g 2
(1. State Ke y Laboratory of High Performance and Co mplex Manufacturing,
Centra- South University,Changsha 410083,China;
2. College of Mechanical and Electrical Engineering,Centra- South University,Changsha 4 10083,China)
Abstract : C o m b i n e d rotor is the vital part of a gas turbine. It is import a n t to reveal the p e r f o r m
anc e de gra dation m e c h a n i s m a n d assess the p er f o rm a n ce d egradation characteristics of the c o m
bined rotor for m a k i n g m a i nt e na n c e d urin g operation. T o r e v e a l the p e rf o r ma n c e degradation
m e c h a n i s m cause d b y structure d e g r a d a t i o n ,the c ha n g e rule of pretension force u n d er time-histo-
ry w a s o btained w i th consideration of the r o d stress relaxation at hig h temperature. B y defining
the degradation degree of c o m b i n e d rotor w ith the pretension force of r o d ,degradation level of
c o m b i n e d rotor s y s t e m w a s evaluated. Aft e r calculating the contact stiffness of adjacent disks in
terface a n d analyzing the d y n a m i c characteristics of c o m b i n e d rotor considering contact interface,
the effect of differ ent degr adat ion level o n d y n a m i c characteristics of c o m b i n e d r o t o r w a s o b
tained. T h e result s h o w e d tht t e m p e r a t u r e w a s a sensitive p a r amet e r for c o m b i n e d rotor d e g ra d a
tion ,the drift of c o m b i n e d rotor natural freq uenc y w a s cau s e d b y the relaxation of r o d ,a n d the
relative reduction of the first three order natural fr equ e ncy for c o m b i n e d rotor differed quite
s m a l l ,w h i c h h a d a linear relationship wit h degradation degree to s o m e extent.
Key words: r od relaxation; c o m b i n e d rot o r; degradation d e g r e e ; contact stiffness; natural fre
q u e n c y
收稿日期 :2013-09-05. 本刊网址• 在线期刊:http://w w w . journals, zju. edu. cn/gcsjxb
基金项目:国家重点基础研究发展计划(9 7 3 计划)重点资助项目(013CB035706).
作者简介:苏永雷(1989— ) ,河南驻马店人,硕士生,从事机械结构动力学研究,E-mail :yongleisu@ 163. com.
通信联系人:王艾伦,教授,博士生导师,E-mail: walwlz@sohu. com.