This paper presents a review of research on turbine rim sealing with emphasis placed on the underlying flow physics and modelling capability. Rim seal flows play a crucial role in controlling engine disc temperatures but represent a loss from the main engine power cycle and are associated with spoiling losses in the turbine. Elementary models that rely on empirical validation and are currently used in design do not account for some of the known flow mechanisms, and prediction of sealing performance with computational fluid dynamics has proved challenging. Computational fluid dynamics and experimental studies have indicated important unsteady flow effects that explain some of the differences identified in comparing predicted and measure sealing effectiveness. This review reveals some consistency of investigations across a range of configurations, with inertial waves in the rotating flow apparently interacting with other flow mechanisms which include vane, blade and seal flow interactions; disc pumping and cavity flows; shear layer and other instabilities; and turbulent mixing.

中文翻译：

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轴向涡轮机轮辋密封中的流动机制

本文回顾了涡轮机轮缘密封的研究，重点介绍了基本的流动物理和建模能力。 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 轮辋密封液流在控制发动机盘温度方面起着至关重要的作用，但代表了主发动机动力循环的损失，并与涡轮机中的损坏损失有关。依赖于经验验证且目前在设计中使用的基本模型没有考虑到一些已知的流动机制，并且使用计算流体动力学预测密封性能已被证明具有挑战性。计算流体动力学和实验研究表明重要的非定常流动效应解释了在比较预测和测量密封有效性时确定的一些差异。该审查揭示了一系列配置中调查的一些一致性，旋转流中的惯性波显然与其他流动机制相互作用，包括叶片、叶片和密封流相互作用；圆盘泵送和空腔流动；剪切层和其他不稳定性；和湍流混合。