Leakage Characteristics of Brush Mounted Labyrinth Seal With Rotating Speed

Miyake, Kunihiro; Duh, Wen-Chien

doi:10.4271/980846

Cited by 1 publication

(1 citation statement)

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“…Compared with the labyrinth seal, the brush seal can reduce leakage by 70% [1]. The brush seal can also be combined with the labyrinth seal to improve seal performance, which results in 50% improvement of seal performance compared with the straight type of the labyrinth seal [2]. Although the brush seal is more expensive than the labyrinth seal, it creates more economic benefits than labyrinth seals during rotor operation [3].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Flow across Brush Elements Based on a 2-D Staggered Tube Banks Model

Song

Liu

et al. 2021

Aerospace

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In order to improve efficiency in turbomachinery, brush seal replaces labyrinth seals widely in the secondary air system. A 2-d staggered tube bank model is adopted to simulate the gas states and the pressure character in brush seal, and computational fluid dynamics (CFD) is used to solve the model in this paper. According to the simulation results, the corrected formula of the Euler number and dimensionless pressure are given. The results show that gas expands when flow through the bristle pack, and the gas expansion closes to an isotherm process. The dynamic pressure increases with decreasing static pressure. The Euler number can reflect the seal performance of brush seals in leakage characteristics. Compared with increasing the number of rows, the reduction of the gap is a higher-efficiency method to increase the Euler number. The Euler number continually increases as the gap decreases. However, with the differential pressure increasing, Euler number first increases and then decreases as the number of rows increases. Finally, the pressure distribution on the surface of end rows is asymmetric, and it may increase the friction between the bristles and the back plate.

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Section: Introductionmentioning

confidence: 99%