交变温度场下组合转子轮盘热滑移机理研究

Thermal Cycling Creep Research of Combined Rotor Turbine Disc under Alternating Temperature Field

针对在高温工作环境中的燃气轮机,建立了组合转子轮盘接触的简化模型,研究了轮盘在交变温度场下的滑移情况,推导出轮盘滑移转角的理论计算公式并揭示了其滑移机理,发现轮盘的滑移转角与其传递的扭矩和轮盘间的温差成正比关系,与界面接触压力和摩擦系数成反比关系。在传热学和接触力学的基础上,利用有限元软件对轮盘模型进行了热结构耦合分析,对理论公式进行验证,并对相关参数的影响情况进行了考察,仿真结果与理论公式反映的情况是一致的,证明了理论公式的合理性。修改模型尺寸进行了多组仿真分析,并对仿真结果进行处理,完善后的理论计算公式可为以后燃气轮机的设计和制造提供一定的参考。

For the gas turbine which worked in high temperature environment, a simplified contact model of the combined rotor turbine disc is established, and under alternating temperature field, the turbine disc slipping is analyzed. The theoretical calculation formula of disc slipping angle is deduced. It is found that slipping angle is in proportion to the transmission torque and temperature difference between the discs, and in inverse proportion to the interface contact pressure and friction coefficient. Subsequently, based on the heat transfer theory and contact mechanics, the model is simulated by the use of ANSYS and the influence of relevant parameters is investigated. The trend of the results is consistent with the theoretical formula. That proves the rationality of the theoretical formula. Finally, the improved theoretical formula can provide certain reference to the gas turbine design and manufacturing.