大型发电机转子护环稳态和瞬态温度及应力分析  

Thermal and stress analysis of large capacity generator retainer in steady and transient state

作　　者：吴孚辉 郑艳蓉[2] 

机构地区：[1]浙江浙能嘉兴发电有限公司,浙江嘉兴314201 [2]英大传媒投资集团有限公司,北京100005

出　　处：《热力发电》2016年第2期64-67,共4页Thermal Power Generation

摘　　要：建立了发电机转子-护环-中心环互相接触的有限元计算模型,并以此为基础开展了静止状态、稳态额定负荷、负荷变动和多个启、停过程的温度和应力计算分析,采用耦合方程多次迭代的方法计算护环、转子与中心环之间的接触应力,得到了发电机转子护环的稳态和瞬态温度、应力计算结果,以及各工况和瞬态过程接触部位的径向应力分布曲线。结果表明:发电机转子护环低周疲劳寿命最薄弱部位的最大等效应力发生在冷态静止工况下,为967.35 MPa;发电机转子护环与转子的最大接触应力发生在冷态静止工况下,为1 364.50 MPa。Finite element analysis model for generator rotor shaft-retaining ring-end disc system was established.On this basis,the thermal and stress analysis was carried out under conditions with static state,stable rated load condition,varying load condition and several start-up/cooling-down procedures.The iterated constraint equation method was used to calculate the contact stress between the rotor shaft,retaining ring and end disc.The steady and transient temperature field and the stress field of the rotor ring were obtained.The results show that,the maximum equivalent stress at the area with the most weak low cycle fatigue life appears at the cold static state,which is 967.35 MPa.The maximum contact stress between rotor shaft and retaining ring also appears at the cold static state,which is up to 1 364.50 MPa.

关 键 词：发电机 转子护环 低周疲劳寿命 稳态 瞬态 温度 应力 有限元 

分 类 号：TM311[电气工程—电机]