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迷宫密封不稳定力三维CFD数值分析方法研究
发表时间：2009-04-30 浏览量：2022 下载量：939
| 全部作者： | 刘晓锋，陆颂元 |
| 作者单位： | 江苏省电力试验研究院有限公司；东南大学振动控制与信息系统研究所 |
| 摘 要： | 迷宫密封中的泄漏流体与转子相互作用产生的气动力能诱发轴系失稳，密封转子动特性系数描述了这一不稳定力的重要特性。建立了涡动转子－迷宫密封三维计算流体动力学（computational fluid dynamics, CFD）数学模型，并以压缩机入口迷宫密封为计算实例，利用通用CFD软件Fluent求解三维CFD模型，获得转子表面气动力，利用涡动转子-迷宫密封动力学模型预测了迷宫密封动特性系数。计算结果与通用CFD软件TASCflow和基于整体流动理论的迷宫密封动特性计算程序DYNLAB的计算结果进行比较，表明三维CFD方法对于漏气量和动特性的预测精度高于整体流动理论。此外，进一步计算分析了密封入口预旋速度和间隙变化以及轴向锥形间隙对迷宫密封稳定性的影响，为消除汽流激振提供理论依据。 |
| 关 键 词： | 动力机械工程；迷宫密封；计算流体动力学；整体流动理论；转子动特性系数� |
| Title： | Three-dimensional CFD numerical study of rotordynamic force �of labyrinth seals |
| Author： | LIU Xiaofeng, LU Songyuan |
| Organization： | Jiangsu Electrical Power Research Institute；Vibration Control and Information System Institute, Southeast University |
| Abstract： | Rotor-fluid interactions can cause self-excited vibrations in turbomachines. The labyrinth seal forces are characterized by rotordynamic coefficients. The major goals of this research were to present the whirling rotor-labyrinth seal model and 3D CFD mathematical model for eccentric rotor-labyrinth seal. The labyrinth seals of a compressor input were taken as objects for analysis. For the case, a 3D model with eccentric rotor was solved to obtain the rotordynamic force components utilizing a general CFD program Fluent. The rotordynamic coefficients of the labyrinth seal were predicted by use of the whirling rotor-labyrinth seal model. The results were compared with those obtained by use of an existing bulk flow computer program DYNLAB currently used by engineering field and another general CFD program TASCflow. The results demonstrated that the CFD method had higher leakage and rotordynamic prediction precision than that of the bulk-flow approaches. Further more, the effects of tangential velocity, clearance, and axis taper clearance on the labyrinth seal stability were analyzed. |
| Key words： | power machinery engineering; labyrinth seal; computational fluid dynamics; bulk flow theory; rotordynamic coefficients |
| 发表期数： | 2009年4月第8期 |
| 引用格式： | 刘晓锋，陆颂元. 迷宫密封不稳定力三维CFD数值分析方法研究[J]. 中国科技论文在线精品论文，2009，2（8）：863-870. |
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