水轮发电机镜板和推力头热弹变形分析

介绍了ANSYS软件用于镜板和推力头的热传导和热弹变形计算的方法.考虑到镜板和推力头结构和受力周期对称的特点,取其Z分之一(Z为瓦块数)作为ANSYS有限元分析模型.推力头和镜板接合面为三维等效热传导单元和三维接触单元.镜板在力载荷作用下,周向变形的高点处在瓦上,低点在瓦间,径向变形在外径侧上翘;镜板在温度载荷作用下,周向由于恒温而不产生变形,径向变形为下凸.镜板面的综合变形为径向下凸,外径侧上翘,沿周向为波浪形.

Analysis of Thermo-elastic Deformation of Runner and Thrust Block for Hydro-generators

This paper presents a method for calculating the heat conduction and thermo-elastic-deformation (TED) of the runner and thrust block by means of ANSYS program. 1/Z(Z is pad number) of runner is chosen as the model for ANSYS according to design of runner and thrust block and cycle symmetrical property, the three-dimensional contact element and the three-dimensional equivalent heat conduction element is located in space between runner and thrust block. The surface of runner is distorted due to pressure loading, the high point of deformation is on pad, and the low point of deformation is in space between pads. The radial deformation of runner is radial tilt, and the high point of deformation is in outer diameter. The surface of runner is distorted due to differential thermal deflection, the circumferential deformation is not distorted due to circumferential constant temperature, and the radial deformation of runner is convex. The whole deformation of surface of runner is radial convex, and the high point of deformation is in outer diameter, the circumferential deformation is wave.