推力轴承对水轮发电机组轴系横向振动特性的影响  

Effect of Thrust Bearing on the Lateral Vibration Characteristics ofthe Shafting System of Hydro-Generator Unit

作　　者：叶毫阳 张万福[1,2] 黄锦辉 李春 YE Haoyang;ZHANG Wanfu;HUANG Jinhui;LI Chun(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai 200093,China;East China Tianhuangping Pumped Storage Power Co.,Ltd.,Anji 313302,Zhejiang Province,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]上海市动力工程多相流动与传热重点实验室,上海200093 [3]华东天荒坪抽水蓄能有限责任公司,浙江安吉313302

出　　处：《动力工程学报》2024年第10期1541-1549,共9页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51875361);国网新源集团有限公司科技项目(SGXYKJ-2022-013)。

摘　　要：建立包含3个导轴承与1个推力轴承联合支承的某300 MW水轮发电机组轴系有限元模型,应用有限元方法研究了推力轴承对轴系横向振动的影响,计算分析了推力轴承弯曲刚度和轴向刚度对轴系横向振动的影响,并研究了发电机转子不平衡量与相位差对轴系振动的影响。结果表明:与不考虑推力轴承相比,考虑推力轴承弯曲刚度时,机组轴系在额定转速下一~三阶固有频率依次增大5.35%、1.89%和1.56%;机组在额定转速下运行,当发电机转子处不平衡量为100 kg·m且相位差为180°时,若弯曲刚度取8.2×106 N/m,下导轴承、上导轴承、推力轴承与集电装置处横向振幅分别降低约17.44%、6.72%、17.04%和28.76%,当不平衡量为100 kg·m且相位差为0°时,若考虑弯曲刚度,各部件横向振幅依次降低约3.31%、2.78%、9.46%和15.01%。A finite element model of a 300 MW hydro-generator unit shaft system supported with three guide bearings and one thrust bearing was established.The influence of thrust bearings on the lateral vibration of shaft system was studied by finite element method.The influence of bending stiffness and axial stiffness of thrust bearings on the lateral vibration was calculated and analyzed,and the influence of unbalance force and phase difference of generator rotor on shaft system vibration was studied.Results show that compared with the non-consideration of thrust bearing,when considering the bending stiffness of thrust bearing,the first to third order natural frequencies of the shaft system at the rated speed increase by 5.35%,1.89%and 1.56%respectively.When the unbalanced force at the rotor of the generator is 100 kg·m and the phase difference is 180°at the rated speed,if the bending stiffness is 8.2×106 N/m,the lateral amplitude of the lower guide bearing,the upper guide bearing,the thrust bearing and the collector is reduced by about 17.44%,6.72%,17.04%and 28.76%,respectively.When the unbalance force is 100 kg·m and the phase difference is 0°,the lateral amplitude of each component is reduced by 3.31%,2.78%,9.46%and 15.01%,respectively,taking into account the bending stiffness.

关 键 词：水轮发电机组 推力轴承 轴向刚度 不平衡量 弯曲刚度 相位差 

分 类 号：TK730.2[交通运输工程—轮机工程]