不平衡导致的发电机组转子反向涡动分析  

Analysis of Backward Whirl of Generator Set Rotor Induced by Unbalance

作　　者：赵博[1,2] 何国安 阚选恩[3] 姜广政 常东锋[1,2] ZHAO Bo;HE Guoan;KAN Xuanen;JIANG Guangzheng;CHANG Dongfeng(Xi’an Thermal Power Research Institute Co.,Ltd.,Xian 710054,China;Xi’an TPRI Energy Conservation Technology Co.,Ltd.,Xian 710054,China;School of Mechanical and Precision Instrument Engineering,Xi’an University of Technology,Xian 710048,China)

机构地区：[1]西安热工研究院有限公司,西安710054 [2]西安西热节能技术有限公司,西安710054 [3]西安理工大学机械与精密仪器工程学院,西安710048

出　　处：《动力工程学报》2022年第3期235-241,262,共8页Journal of Chinese Society of Power Engineering

基　　金：中国华能集团有限公司总部科技资助项目(HNKJ18-H16);陕西省自然科学基础研究资助计划资助项目(2021JQ-462)。

摘　　要：针对多台大型汽轮发电机组在振动测试过程中的不平衡导致转子反向涡动的问题,建立非对称支撑转子系统动力学模型,通过模态叠加法推导出系统对不平衡激振力的响应,分析不平衡振动矢量对转子涡动方向的影响规律,并结合3台600 MW等级汽轮发电机组轴系现场动平衡前后振动测试实例,分析了工作转速下转子发生反向涡动的原因。结果表明:即使在避开临界转速区域的工况下,各向异性支撑轴系发生多面不平衡时,只要各处不平衡的轴向位置、大小和角度满足一定关系,部分轴颈截面就会表现为反向涡动。Aiming at the problem of rotor backward whirl caused by unbalance in the vibration test of several large turbine generator sets,a dynamic model of the rotor system with non-axisymmetric support was established,and the response of the system to the unbalanced excitation force was derived by the mode-superposition method to analyze the influence of the unbalance vector on the rotor whirl direction.In addition,the mechanism was confirmed by vibration test results of three 600 MW steam turbo-generator sets before and after the on-site dynamic balance.Results show that even under the condition of avoiding the critical speed region,when multi-plane or distributed unbalance occurs in the anisotropic support rotor system,as long as the axial position,size and angle of the unbalance meet a certain relationship,it will lead to particular sections of the rotor backward whirl at working speeds.

关 键 词：转子系统 反向涡动 各向异性 模态叠加法 多面不平衡 

分 类 号：O347.6[理学—固体力学] TH113[理学—力学]