某发动机涡轮盘降应力设计

Stress Reduction Design for the Turbine Disk of an Engine

在满足重量和装配要求的前提下,为提高涡轮盘的使用寿命,采用有限元分析的方法对涡轮盘的螺栓孔和榫槽进行降应力设计。计算结果表明,螺栓孔的最大当量应力由1552MPa降至1180MPa,降幅23.97%;榫槽最大当量应力由1357MPa降至1195MPa,降幅11.94%,解决了螺栓孔及榫槽应力偏高的问题。虽然降应力优化设计后使涡轮盘的重量增加了0.315kg,但仍满足设计要求。涡轮盘在低应力工况下可延长使用寿命,这对提高整个发动机的寿命具有重要意义。

On the premise of meeting the requirements of weight and assembly,and in order to improve the service life of the turbine disk,the fi nite element analysis method is used to reduce the stress of the bolt hole and mortise.The calculation results show that the maximum equivalent stress in bolt hole is reduced from 1552 MPa to 1180 MPa,a 23.97%drop,and the maximum equivalent stress in mortise is reduced from 1357 MPa to 1195 MPa,a 11.94%drop,the problem of high stress in bolt hole and mortise of the turbine disk is solved.Although the optimization leads to an increase in weight of 0.333kg,it still meets the design requirements.The turbine disk can prolong the service life under low stress condition,which is of great signifi cance to improve the life of the engine.