超超临界汽轮机末级动叶接触及振动特性分析  

Analysis on Contact Status and Vibration Characteristics of Last Stage Rotor Blades in Ultra-supercritical Steam Turbines

作　　者：陈海燕 张艳春[2] 范玮[3] 

机构地区：[1]北京华清燃气轮机与煤气化联合循环工程技术有限公司,北京100084 [2]清华大学热能工程系,北京100084 [3]北京全四维动力科技有限公司,北京100095

出　　处：《动力工程学报》2016年第3期185-190,共6页Journal of Chinese Society of Power Engineering

摘　　要：针对超超临界汽轮机末级动叶普遍采用的凸台式阻尼拉筋、整圈自锁扭叶片结构,建立了三维非线性接触模型,采用有限元软件对某汽轮机叶片的强度及振动进行数值模拟,分析了拉筋间及围带间不同安装间隙下叶片的扭转变形,并基于设计的间隙值,得到了围带及拉筋的接触状态随转速的变化规律以及非线性接触对振动特性的影响.结果表明:拉筋间及围带间的非线性接触对叶片的扭转变形和动频影响较大,可以通过调整围带、拉筋结构及其安装间隙来改变叶片的刚度和频率.For the structure of damping lacing wire and interlocked shroud generally used in the last stage rotor blades of ultra-supercritical steam turbines, a 3D nonlinear contact model was established, based on which numerical simulation was conducted on the strength and vibration of a certain homemade blade using finite element method, so as to analyze the torsional deformation of blades under different mounting clear- ance between of lacing wire to lacing wire and shroud to shroud, and to obtain the variation law of their contact status with rotating speed, and the effects of above nonlinear contact on the vibration characteris- tics according to the design value of clearance. Results illustrate that the nonlinear contact of lacing wire to lacing wire and shroud to shroud has significant effects on torsional deformation and dynamic frequencies of the blade. The stiffness and dynamic frequencies of the blade can be altered by changing the structure of lacing wire and shroud as well as their mounting clearance.

关 键 词：汽轮机末级动叶 强度振动 拉筋 围带 有限元分析 

分 类 号：TK268[动力工程及工程热物理—动力机械及工程]