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Development of hypersonic engine seals: flow effects of preload and engine pressures
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Mutharasan, Rajakkannu Steinetz, Bruce M. Ko, Frank K. Cai, Zhong |
| Copyright Year | 1993 |
| Description | 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. |
| File Size | 636772 |
| Page Count | 16 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19940023096 |
| Archival Resource Key | ark:/13960/t9k40q83n |
| Language | English |
| Publisher Date | 1993-04-01 |
| Access Restriction | Open |
| Subject Keyword | Mechanical Engineering Leakage Seals Stoppers Ramjet Engines Engine Design Hypersonic Flight Ceramic Fibers Coolants Flow Velocity Mathematical Models High Temperature Prestressing Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
