叶片热弹耦合场分析  

Heat-elasticity Coupling Field Analysis of Blade

作　　者：武新华[1] 马晓峰[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《汽轮机技术》2003年第1期14-16,共3页Turbine Technology

基　　金：哈尔滨工业大学校基金资助(HIT.2000.75)。

摘　　要：为了准确计算叶片在多场耦合条件下的应力及动力特性,在考虑与热源、热力学物性常数及换热边界条件的同时,还要考虑到弹性变形应变率的影响,及其相互的耦合作用。根据叶片的几何形状,把叶片模拟为板,并通过热弹性理论基本方程导出板的非线性热弹耦合振动基本方程。用有限元法计算了某实际叶片的热弹耦合应力值,并与非耦合情况作了比较。得出了叶片在耦合条件下热应力的影响是主要的结论。在设计中应予以注意。For accurate calculation the stress and dynamic characteristics of blade under the condition of multi-field coupling, the heat source, physical thermodynamics constant and healchanging boundary condition must be considered. Furthermore, the influence of strain rate of flexible deformation and the mutual coupling function also should be considered. In this paper, according to the geometric shape of blade and ass assuming the blade to be plate, the basic vibration equation of nonlinear heat-elasticity coupling has been derived based on the heat-elasticity theory. By using the finite element method the stress values of heat elasticity coupling field of certain actual blade are calculated, and compared with the noncoupling field situation. The results of calculation show, that under the condition of coupling the influence of temperature stress is main for blade, it must be considered in design.

关 键 词：叶片 热弹耦合 有限元 弹性变形应变率 热力学特性常数 

分 类 号：TH133[机械工程—机械制造及自动化] TK123[动力工程及工程热物理—工程热物理]