High Temperature Propulsion System Structural Seals for Future Space Launch Vehicles
High Temperature Propulsion System Structural Seals for Future Space Launch Vehicles by Patrick H Dunlap is published by Bibliogov on July 31, 2013. This 28-page work explores the development of durable and flexible sliding seals necessary for advanced hypersonic engines, specifically designed to operate efficiently and safely in extreme heat environments ranging from 2000 to 2500 degrees Fahrenheit. The book details the challenges faced by current seal designs and presents innovative solutions being researched at NASA’s Glenn Research Center.
Readers will find a thorough examination of advanced ceramic wafer seal designs and various seal preloading devices evaluated through rigorous testing. The text discusses the performance of silicon nitride wafer seals under high-temperature conditions and their resilience during scrubbing tests, highlighting their effectiveness compared to traditional braided rope seal flow blockers. Additionally, the potential of canted coil springs and silicon nitride compression springs as preloading devices is analyzed, along with a finite element model that suggests the feasibility of creating springs from high-temperature materials for future applications. This edition provides insights into the intersection of engineering and materials science within the context of aerospace technology.
Official synopsis Publisher
Durable, flexible sliding seals are required in advanced hypersonic engines to seal the perimeters of movable engine ramps for efficient, safe operation in high heat flux environments at temperatures of 2000 to 2500 F. Current seal designs do not meet the demanding requirements for future engines, so NASA s Glenn Research Center is developing advanced seals and preloading devices to overcome these shortfalls. An advanced ceramic wafer seal design and two types of seal preloading devices were evaluated in a series of compression, scrub, and flow tests. Silicon nitride wafer seals survived 2000 in. 1000 cycles) of scrubbing at 1600 F against an Inconel 625 rub surface with no chips or signs of damage. Flow rates measured for the wafers before and after scrubbing were almost identical and were up to 32 times lower than those recorded for the best braided rope seal flow blockers. Canted coil springs and silicon nitride compression springs showed promise conceptually as potential seal preloading devices to help maintain seal resiliency. A finite element model of the canted coil spring revealed that it should be possible to produce a spring out of high temperature materials for applications at 2000+ F.
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