郭瑞,杨建刚,曹浩,孙丹
GUO Rui,YANG Jian-gang,CAO Hao,SUN Dan(National Engineer Research Center of Turbo-Generator Vibration

• 1:东南大学火电机组振动国家工程研究中心

摘要(Abstract)：

喷嘴配汽汽轮机在部分进汽时调节级附近会形成极不均匀的流场,不仅影响调节级动叶轮周力的分布,还会对临近密封间隙内的流场及流体对转子的作用力产生扰动。以某国产300MW汽轮机端部汽封间隙为参考,建立密封间隙CFD模型,求解三维、粘性、可压缩N-S方程,研究了不同进汽方式、偏心情况下流场特性及流体对转子作用力。结果表明:部分进汽的位置、转子的偏心距及两者的相对位置对汽流力的大小、方向和变化趋势产生了较大的影响。在某些部分进汽情况下,偏心距增大也会减小汽流力。
The nozzle governing steam turbine can causes uneven flow field near the governing stage.It affects not only the distribution of blade force but also the flow field and the flow induced force in the nearby seal clearance.A numerical calculation model that base on the structure of a 300MW turbine front shaft seal is set up.The full 3D viscous compressible N-S equation is numerically solved.The flow field in the seal clearance and force to rotor are analyzed under different partial admission modes and eccentricity range.The results show that the partial admission forms the prominent low pressure area;moreover,both the force and the force change trend are influenced by different partial admission mode and the relative position between the low pressure area and the eccentric direction.Under specific conditions,the flow induced force decreases with the increase of eccentricity.

关键词(KeyWords)： 部分进汽;CFD;密封间隙;流体激振力
partial admission;CFD;seal clearance;flow excited force

Abstract:

Keywords:

基金项目(Foundation): 国家“863”计划大型发电机组安全稳定运行关键技术及保障系统研究(2007AA04Z434)

作者(Author): 郭瑞,杨建刚,曹浩,孙丹
GUO Rui,YANG Jian-gang,CAO Hao,SUN Dan(National Engineer Research Center of Turbo-Generator Vibration

参考文献(References)：

• [1]白泽军.张家口发电厂2号汽轮发电机组振动异常分析及处理[J].华北电力技术,2000(8):34-38.
• [2]张学延,王延博,张卫军.超临界压力汽轮机蒸汽激振问题分析及对策[J].中国电力,2002,35(12):1-6.
• [3]王向前,刘景春,杨晓东.800 MW超临界汽轮机汽流激振问题的解决[J].东北电力技术,2002,3:4-7.
• [4]武红幸.国产300MW汽轮机顺序阀投运存在问题的分析及对策[J].西北电力技术.2004(6):79-82.
• [5]郑展友.湛江发电厂3#汽轮机汽流激振分析及处理[J].热力发电.2005,12:68-69.
• [6]孙军.顺序阀运行方式下600MW汽轮机瓦温偏高分析[J].华东电力.2006,34,(10):74-76.
• [7]李卫军,张宝,童小忠.汽轮机进汽方式切换时轴振与瓦温异常分析[J].汽轮机技术.2006,48(6):462-464.
• [8]范建富.邹县电厂4号机组汽流激振故障分析[J].山东电力技术.2007(2):59-62.
• [9]赵永林,秦占峰,史新刚.600MW汽轮机单阀切顺序阀运行解决方案的探索[J].热力透平.2007,36(1):71-75.
• [10]柴山,张耀明,曲庆文,等.汽轮机扭叶片级间隙气流激振力分析[J].中国电机工程学报,2001,21(5):11-16.
• [11]纪海东,于达仁.汽轮机配汽剩余汽流力对轴系影响的研究[J].黑龙江电力.2003,25(5):355-358.
• [12]郭瑞,杨建刚.汽轮机进汽方式对调节级叶顶间隙蒸汽激振力影响的研究[J].中国电机工程学报.2006,26(1):8-11.
• [13]徐星仲,徐力平,蔡虎,等.处于部分进汽时动叶片排内非定常流动现象的数值研究[J].工程热物理学报,2000,22(1):36-39.
• [14]訾宏达,方韧,徐星仲,等.汽轮机部分进汽调节级三维流场的非定常数值模拟[J].动力工程.2007,27(5):721-724,761.
• [15]Joseph K,Scharrer.Theory Versus Experiment for theRotordynamic Coefficients of Labyrinth Gas Seals:Part I—A Two Control Volume Model[J].ASMEJournal of Vibration,Acoustics,Stress,and Reliabili-ty in Design,1988,110(7):270-280.
• [16]Childs D W,Scharrer J K.Theory Versus Experimentfor the Rotordynamic Coefficients of Labyrinth GasSeals:Part II—A Comparison to Experiment[J].ASME Journal of Vibration,Acoustics,Stress,andReliability in Design.1988,110(7):281-287.
• [17]Jeffrey Moore J.Three-Dimensional CFD Rotordynam-ic Analysis of Gas Labyrinth Seal[J].Journal of Vi-bration and Acoustics,2003,125(4):427-433.
• [18]Choi Dong-Chun,Rhode David L.Development of aTwo Dimensional Computational Fluid Dynamics Ap-proch for Computing Three-Dimensional HoneycombLabyrinth Leakage[J].ASME Journal of Engineeringfor Gas Turbines and Power,2004,126(10):794-802.
• [19]Hirano Toshio,Guo Zenglin,Gordon Kirk R.Applica-tion of Computational Fluid Dynamics Analysis for Ro-tating Machinery-Part II:Labyrinth Seal Analysis[J].Journal of Engineering for Gas Turbines and Power.,2005,127(4):820-826.
• [20]李军,邓清华,丰镇平.蜂窝汽封和迷宫式汽封流动性能比较的数值研究[J].中国电机工程学报,2005,25(16):108-111.
• [21]Asok S P,Sankaranarayanasamy K,Sundararajan T,etal.Neural Network and CFD-based Optimisation ofSquare Cavity and Curved Cavity Static LabyrinthSeals[J].Tribology International,2007,40:1204-1216.