✦ LIBER ✦

Analysis of gas leakage through C/C composites

✍ Scribed by Hiroshi Hatta; Kazunari Shibuya; Yuichi Nishiyama; Yasuo Kogo

Publisher: Elsevier Science
Year: 2003
Tongue: English
Weight: 770 KB
Volume: 41
Category: Article
ISSN: 0008-6223
DOI: 10.1016/s0008-6223(03)00413-5

No coin nor oath required. For personal study only.

✦ Synopsis

Gas leakage through carbon-fiber-reinforced carbon matrix composites (C / Cs) was examined with respect to the application of C / Cs in heat exchangers in an engine system for a future space plane. Because C / Cs have many cracks and pores, gas readily leaks through them. To predict and prevent this gas flow through the C / Cs, leakage rates were measured as a function of pressure, and gas flow paths were identified by microscopic observations of C / Cs. Several analytical models were then used to clarify the principal mechanisms yielding gas-flow resistance. Laminar flow models in tubes and slits were found to give excellent leak-rate predictions compared with experimental results for unidirectionally and three-dimensionally reinforced C / Cs, respectively. A model based on adiabatic expansion and compression, which is used for gas leaks through labyrinth seals, resulted in reasonable agreement with the leak rates through a cross-ply laminated C / C.

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