偏置量影响的超超临界汽轮机转子密封动力特性  

Dynamic Characteristics of Rotor Seals Influenced by Offset for Ultra-supercritical Steam Turbines

作　　者：李大才 吕长虹 卜振海 刘伟 李鹏凯 曹丽华[2] 李想[2] LI Da-cai;LYU Chang-hong;BU Zhen-hai;LIU Wei;LI Peng-kai;CAO Li-hua;LI Xiang(Guangdong Datang International Leizhou Power Generation Co.,Ltd.,Leizhou 524255,China;School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]广东大唐国际雷州发电有限责任公司,雷州524255 [2]东北电力大学能源与动力工程学院,吉林132012

出　　处：《汽轮机技术》2024年第4期271-274,共4页Turbine Technology

基　　金：知识图谱在二次再热百万机组健康管理中的应用研究(CDTHT20230042372)。

摘　　要：超超临界汽轮机运行时不平衡的汽流冲击力会引发汽流激振,以某1000MW汽轮机超高压缸隔板迷宫密封为研究对象,采用改进的涡动方程控制转子实现多频涡动,分析了不同偏置量对密封动力特性的影响。结果表明:直接刚度k_(yy)随涡动频率的增加而增加,直接阻尼c_(yy)在30Hz以前先降低后不变。随着压比的增加,有效阻尼增大,转子的稳定性提高。各偏置量下直接刚度k_(yy)朝着正方向增大,c_(yy)随频率的增加先大幅度减小最后近似不变,偏置量引起的密封气动特性变化在高压区域较强。During the operation of ultra-supercritical steam turbines,the unbalanced steam flow impact force can cause steam flow excitation.Taking the labyrinth seal of a 1000MW steam turbine ultra-high pressure cylinder as an example,the improved whirl equation and mesh deformation were used to realize the multi-frequency whirl of the rotor.The effects of different offset on the seal dynamic characteristics were analyzed.The results show that the direct stiffness k_(yy)increases with the increasing of whirl frequency.The direct damping c_(yy) first decreases significantly before 30Hz and then does not change with frequency.As the pressure ratio increases,the effective damping increases,and the stability of the rotor increases.The direct stiffness of the seal k_(yy)increases in the positive direction at each offset.The direct damping c_(yy) decreases greatly with the increasing of frequency and remains approximately unchanged at last.The variation in seal aerodynamic characteristics caused by the offset is strong in the high-pressure region.

关 键 词：超超临界机组 汽流激振 迷宫密封 动力特性 

分 类 号：TK264[动力工程及工程热物理—动力机械及工程]