Flow mechanisms in axial turbine rim sealing
Flow mechanisms in axial turbine rim sealing
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DOI：
10.1177/0954406218784612
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发表时间：
2019-12-01
影响因子：
2
通讯作者：
Palermo, Donato M.
中科院分区：
文献类型：
--
作者：
Chew, John W.;Gao, Feng;Palermo, Donato M.
本文对涡轮轮缘密封的研究现状进行了综述，重点介绍了涡轮轮缘密封的基本流动物理和模拟能力。轮缘密封流在控制发动机圆盘温度方面起着至关重要的作用，但它代表着主机动力循环的损失，并与涡轮的损坏损失有关。目前在设计中使用的依赖于经验验证的基本模型无法解释一些已知的流动机理，用计算流体力学预测密封性能已被证明具有挑战性。计算流体力学和实验研究已经表明了重要的非定常流动效应，这解释了在比较预测和测量密封效率时发现的一些差异。这篇综述揭示了各种构型研究的一些一致性，旋转流动中的惯性波显然与其他流动机制相互作用，包括叶片、叶片和密封流的相互作用；圆盘泵送和空腔流动；剪切层和其他不稳定；以及湍流混合。
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.