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首页> 外文会议>International Symposium on Stability Control of Rotating Machinery(ISCORMA-4); 20070827-31; Calgary(CA) >THE INFLUENCE OF LABYRINTH SEAL DESIGN ON STEAM TURBINE ROTOR STABILITY: PARAMETRIC STUDY
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THE INFLUENCE OF LABYRINTH SEAL DESIGN ON STEAM TURBINE ROTOR STABILITY: PARAMETRIC STUDY

机译：Labyrinth密封设计对汽轮机转子稳定性的影响：参数研究

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摘要

The presented work has been motivated by a recent rotor stability problem encountered during the commissioning of a 94 MW steam turbine installed in a combined cycle. The excessive fluid-induced vibration did not enable to operate the steam turbine above 45% of its nominal power output. Design changes of labyrinth seals and bearings eliminated this vibration problem. The design changes of labyrinth seals were supported by the evaluation of dynamic coefficients for turbine seals using "SEAL2D/3D", a CFD code developed at the University of Mannheim. The linear stability criteria used was based on API 617/684 standards. Problems faced during the application of stability criteria from API 617/684 are discussed. A simple model representing the system of seal-rotor-bearing system was used to explain the effects of seal/bearing coefficients variation onto the rotor stability. Following the successful application of the SEAL CFD code, the dynamical coefficients of shroud seals used in the OEM steam turbines have been evaluated in a parametric study. Relevant parameters such as steam inlet pressure, pressure ratio, circumferential pre-swirl velocity, teeth pitch/clearance and labyrinth seal diameter have been varied.
机译：提出的工作是受最近在联合循环中安装的94 MW汽轮机调试期间遇到的转子稳定性问题的推动。流体引起的过度振动无法使蒸汽轮机在其标称功率输出的45％以上运行。迷宫式密封件和轴承的设计变更消除了这种振动问题。使用曼海姆大学开发的CFD代码“ SEAL2D / 3D”评估涡轮机密封件的动态系数，可以支持迷宫式密封件的设计变更。使用的线性稳定性标准基于API 617/684标准。讨论了应用API 617/684的稳定性标准期间面临的问题。用一个简单的表示密封件-转子-轴承系统的模型来解释密封件/轴承系数变化对转子稳定性的影响。在成功应用SEAL CFD代码之后，已在参数研究中评估了OEM汽轮机中使用的护罩密封件的动态系数。相关参数如蒸汽入口压力，压力比，周向预旋速度，齿距/间隙和迷宫式密封直径已更改。

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