复杂载荷下燃气轮机轮盘Hirth齿多尺度接触界面结构强度特性研究

Multi-scale Structural Strength Analysis of the Contact Interface of the Hirth Teeth of a Gas Turbine Rotor Disk Under Complex Loads

中心拉杆转子是燃气轮机的核心部件,但转子运行工况恶劣、事故频发,需要开展复杂接触状态下多尺度、多载荷作用的强度研究,以保障叶盘结构运行安全。基于粗糙表面接触模型和三维有限元方法,建立了考虑微观界面尺寸和粗糙度的燃气轮机轮盘Hirth齿接触界面热固耦合特性分析模型,探究了接触面微观尺度参数以及端面齿宏观尺度几何参数的影响。结果表明:端面齿的最大等效应力随齿根圆角半径的增大、压力角的减小而减小;端面齿的最大等效应力和平均接触压力均随着表面粗糙度的增大而减小。

As the heart of the gas turbine,the central rod-fastened rotor operates under harsh conditions with frequent incidents,necessitating a rigorous exploration of its strength under complex contact states across multiple scales and loads to ensure the safe functioning of the disc structure.Employing a rough surface contact model and three-dimensional finite element methods,a thermo-mechanical coupling analysis model for the gas turbine disc's Hirth tooth contact interface was developed,incorporating microscale interface dimensions and surface roughness.Results show that the maximum equivalent stress of the end face teeth decreases with the increase of the root fillet radius and the decrease of the pressure angle;the maximum equivalent stress and average contact pressure of the end face teeth decrease with the increase of surface roughness.