重型燃气轮机轮盘弯扭结构应力强度设计研究

摘要

组合转子各级轮盘离散,不是连续整体,引发接触效应.当前国内研究多将组合转子视为整体转子的办法处理,而组合转子各级轮盘接触界面间存在扭矩和弯矩的作用,使接触面结构应力强度降低,从而产生局部微滑移,是整体转子不具备的特点.故有必要对轮盘接触界面弯扭结构应力强度进行研究,避免因结构应力强度不足产生局部微滑移.基于接触力学理论,得出轮盘界面在弯矩扭矩作用下的应力分布,进而得出局部微滑移主要诱因、临界值和提高临界值的设计方法.结果表明,组合转子承受的弯矩是轮盘接触面结构应力下降产生局部微滑移的主要诱因;增大拉杆分布的圆周半径和轮盘接触面积,可以使承受弯矩的临界值增大,提高轮盘接触面的结构应力强度.%The combined rotor at all levels of the disc is discrete,not continuous whole,and the contact effect is triggered.The current domestic research treats the combined rotor as a whole rotor.The combined rotor at all levels of the contact interface between the torque and bending moment,so that the contact surface structural stress intensity is reduced,which results in local micro slip due to insufficient strength of structural stress.Based on the theory of contact mechanics,the stress distribution in the disk interface under the action of bending moment torque is obtained,then the local micro slip causing critical value is obtained,and the design method of critical value is improved.The results show that the composite rotor is under stress moment by main causes of local micro slip wheel contact surface structure;increasing the radius of the circle and the wheel rod distribution of contact area can increase the critical value of bearing moment and increase the wheel contact surface stress intensity.