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首页> 外文期刊>Journal of turbomachinery >Tip-Shroud Labyrinth Seal Effect on the Flutter Stability of Turbine Rotor Blades
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Tip-Shroud Labyrinth Seal Effect on the Flutter Stability of Turbine Rotor Blades

机译：顶端罩迷宫式密封对涡轮转子叶片颤振稳定性的影响

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摘要

The effect of the tip-shroud seal on the flutter onset of a shrouded turbine rotor blade, representative of a modern gas turbine, is numerically tested, and the contributions to the work per cycle of the aerofoil and the tip shroud are clearly identified. The numerical simulations are conducted using a linearized frequency-domain solver. The flutter stability of the shrouded rotor blade is evaluated for an edgewise mode and compared with the standard industrial approach of not including the tip-shroud cavity. It turns out that including the tip shroud significantly changes the stability prediction of the rotor blade. This is due to two facts. First, the amplitude of the unsteady pressure created in the inter-fin cavity due to the motion of the airfoil is much greater than that of the airfoil. The impact of this contribution increases with the frequency. Second, the effect of the outer shroud of the rotor blade, which usually is not included either in the simulations, has an opposite trend with the nodal diameter than the airfoil reducing the maximum and minimum damping. It is concluded that the combined effect of the seal and its platform tends to stabilize the edgewise mode of the rotor blade for all the examined nodal diameters and reduced frequencies. Finally, the numerical results are shown to be consistent with those obtained using an analytical simplified model to account for the effect of the labyrinth seals.
机译：尖端护罩密封对代表现代燃气轮机的有罩涡轮转子叶片颤动开始的影响进行了数值测试，并且清楚地确定了翼型和尖端护罩每个周期功的贡献。使用线性化的频域求解器进行数值模拟。对于有侧向模式，评估了带罩转子叶片的颤动稳定性，并与不包括叶尖罩腔的标准工业方法进行了比较。事实证明，包括顶部护罩会极大地改变转子叶片的稳定性预测。这是由于两个事实。首先，由于翼型件的运动而在翅片间空腔中产生的非稳态压力的幅度远大于翼型件的不稳定压力的幅度。该贡献的影响随频率增加。其次，通常不包括在仿真中的转子叶片外罩的影响，与节流直径相比，与翼型具有相反的趋势，减小了最大和最小阻尼。结论是，对于所有检查的节点直径和降低的频率，密封件及其平台的综合作用趋于稳定转子叶片的边缘模式。最后，数值结果显示与使用解析简化模型说明迷宫式密封效果的结果一致。

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  • 来源
    《Journal of turbomachinery》 |2019年第10期|101006.1-101006.10|共10页
  • 作者

    Corral Roque; Greco Michele; Vega Almudena;

  • 作者单位

    Ind Turbopropulsores SAU Adv Engn Direct Madrid 28108 Spain|UPM Dept Fluid Dynam & Aerosp Prop Sch Aeronaut & Space Helsinki Finland;

    Univ Politecn Madrid Sch Aeronaut & Space Dept Fluid Dynam & Aerosp Prop E-28040 Madrid Spain;

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