Fluid Dynamic Behavior of Conventional and Pressure Relieving Brush Seals
Fluid Dynamic Behavior of Conventional and Pressure Relieving Brush Seals
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传统刷式密封和泄压式刷式密封的流体动力学行为
DOI：
10.1115/1.4063775
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发表时间：
2024
期刊：
影响因子：
--
通讯作者：
Bowen J
中科院分区：
文献类型：
--
作者：
Bowen J
刷式密封由一个致密的、柔性的、细钢丝刷毛构成的静态环组成，这些钢丝刷毛可提供流动阻力。压力释放刷式密封件可用于通过减少刷毛束和背板表面之间的摩擦来克服诸如影响密封耐久性的滞后等问题。采用一种同时利用发动机代表性和大规模试验设施的方法，研究了这种设计对刷式密封流体动力学行为的影响。使用文献中的多孔介质模型拟合泄漏数据，以量化粘性和惯性阻力系数。轴旋转被证明会导致密封泄漏减少和背板表面静压增加。压力释放背板还导致该位置处的静压增加，导致流动阻力降低，从而增加了通过多孔刷丝束的泄漏。对两种背板设计的大规模刷毛间压力场的调查显示，轴向压力分布朝向刷毛束后部发散。使用大规模研究收集的细节已被证明是具有代表性的;因此，该见解一般适用于刷式密封。
Brush seals consist of a static ring of densely packed, flexible, fine wire bristles that provide resistance to the flow. Pressure relieving brush seals can be employed to overcome issues such as hysteresis that affect seal durability by reducing friction between the bristle pack and back plate surface. The impact of such designs on the fluid dynamic behavior of brush seals was studied following a concomitant methodology that exploited the benefits of both engine representative and large-scale testing facilities. Leakage data were fitted using a porous medium model found in the literature to quantify viscous and inertial resistance coefficients. Shaft rotation was shown to cause a reduction in seal leakage and an increase in static pressure on the back plate surface. The pressure relieving back plates also resulted in increased static pressures at this location, causing a reduction in flow resistance that increased leakage through the porous bristle pack. Interrogation of the large-scale inter-bristle pressure field for the two back plate designs revealed the distributions of axial pressure diverged toward the rear of the bristle pack. The detail gathered using the large-scale study has been shown to be representative; hence, the insight is generically applicable to brush seals.