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Characterizing the Leakage Flow of Braided Fiber Seals
Journal article   Peer reviewed

Characterizing the Leakage Flow of Braided Fiber Seals

Zhong Cai, Rajakkannu Mutharasan, Frank Ko and Bruce M. Steinetz
Textile research journal, v 64(1)
Jan 1994
DOI: https://doi.org/10.1177/004051759406400101

Abstract

A new kind of high temperature flexible braided fiber seal has been developed for advanced hypersonic engine applications. Leakage flow experimental observations show that both engine pressure and preload pressure influence leakage flow rate. Al though the Reynolds number is relatively small ( Re < 10), the mass flow rate com parison of air versus helium reveals that the leakage flow is not viscous dominant. The Ergun equation describing flow through porous media is applied to the flow analysis. The two constants in the Ergun equation, designated as the viscous flow constant C L and the inertial flow constant C T , are determined experimentally. For the leakage flow test setup and the seal geometry, test data show that the values of C L and C T vary for different seal fiber architectures. The relative magnitude of the non viscous flow effect can be determined using a dimensionless variable ( ReC T /C L ). If this variable is much less than 1, the nonviscous flow effect can be neglected. For the seals tested, the ratio of C T /C L is at the range of about 1 to 2 in most cases. Therefore the criterion for the viscous dominant flow is Re < 0.1. Predictions of seal leakage flow using the Ergun equation show good agreement with experimental data of both fluid media, air and helium.

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2 citations in Web of Science
3 citations in Scopus

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Collaboration types
Domestic collaboration
Web of Science research areas
Materials Science, Textiles
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