Conference paper
Development of Hypersonic Engine Seals: Flow Effects of Preload and Engine Pressures
01 Apr 1993
Abstract
A new type of engine seal is being developed to meet the needs of advanced hypersonic engines. A seal braided of emerging high temperature ceramic fibers comprised of a sheath-core construction was selected for study based on its low leakage rates. Flexible, low-leakage, high temperature seals are required to seal the movable engine panels of advanced ramjet-scramjet engines either preventing potentially dangerous leakage into backside engine cavities or limiting the purge coolant flow rates through the seals. To predict the leakage through these flexible, porous seal structures as a function of preload and engine pressures, new analytical flow models are required. An empirical leakage resistance/preload model is proposed to characterize the observed decrease in leakage with increasing preload. Empirically determined compression modulus and preload factor are used to correlate experimental leakage data for a wide range of seal architectures. Good agreement between measured and predicted values are observed over a range of engine pressures and seal preloads.
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Details
- Title
- Development of Hypersonic Engine Seals: Flow Effects of Preload and Engine Pressures
- Creators
- Frank K Ko - Drexel UniversityZhong Cai - Drexel UniversityRajakkannu Mutharasan - Drexel University, Chemical and Biological EngineeringBruce M Steinetz - NASA Safety Center
- Conference
- Joint Propulsion Conference and Exhibit (Monterey, California, 28 Jun 1993–30 Jun 1993)
- Publisher
- National Aeronautics and Space Administration
- Resource Type
- Conference paper
- Language
- English
- Academic Unit
- Materials Science and Engineering; Chemical and Biological Engineering
- Identifiers
- 991022043493804721