涡轮转子在瞬态热冲击下的热应力是最重要的参数之一，它直接影响着转子的疲劳寿命以及运行的安全性。基于热弹耦合理论推导和有限元数值仿真，针对涡轮转子的两种典型结构开展了瞬态热冲击下的热分析，研究了瞬态应力场、温度场的分布特性及其随转子结构参数的变化规律。同时，针对涡轮转子在实际工作过程中常遇到的非对称热冲击现象，进行了转子在周向非对称热冲击载荷分布下的热分析，研究结果表明涡轮转子瞬态热应力大于稳态热应力，且受到倒圆半径、轮盘厚度和盘轴比的影响，研究结果对发动机转子设计初期的热疲劳寿命评估有借鉴意义。%Thermal stress is one of the most important parameters in turbine rotors undergoing transient thermal impact, and it directly influences the safety and life of turbine rotors. Based on thermoelastic coupling deriva⁃tion and finite element simulation, we analyzed the two types of typical turbine rotor structures undergoing tran⁃sient thermal impact and investigated the transient thermal stress, temperature distributions, and resulting rule changes of the rotor structure parameters. In addition, to better understand the asymmetric thermal impact phe⁃nomenon of the turbine rotor when in operation, we investigated the heat conduction of the turbine rotor while undergoing circumferential asymmetric thermal impact. The results show that transient thermal stress on the tur⁃bine rotor is greater than the steady state thermal stress, and the rotor is affected by the corner radius, disk thickness, and disk to shaft ratio. These results could be used as a reference in early design stage for estimating the thermal fatigue life of a turbine rotor.
展开▼
