A stady of die ^r^ of a swiil cimaal gas-Uquid injector operattng at hi^ gasWqnid momentam rattcK is leported. Mndng and droplet size characteristics of tiie srriri injector are also (mnpared to a shear ctmxial injectw, currently bdng used in die space shutde main cn^e ftiel prelmmw. The injectors were t^ted at dev^ed daamber prKSOTK using water » a liquid os^gm simulant and nitn^n and hdinm as ^seois hydrogen dmulants. The debated chamber pressure allowed fw matching of several of the prebumer injector conditions indudinggK/Ucpiid momentum ratio, dendty ratio, and Mbch numbec IHagnmtf c tKhniquM nsed to characteri» the spray induded strobe backli^t ima^ng Iwer-dieet spray ima^ng, mMJianlcal pattemation, and phase Doppler interferometry. The mults Indicate tiiat die radial spreading
The National Aeronautics and Space Administration established a new program office, Next Generation Launch Technology (NGLT) Program Office, last year to pursue technologies for future space launch systems. NGLT will fund research in key technology areas such as propulsion, launch vehicles, operations and system analyses. NGLT is part of NASA's Integrated Space Technology Plan. The NGLT Program is sponsored by NASA's Office of Aerospace Technology and is part of the Space Launch Initiative theme that includes both NGLT and Orbital Space Plane. NGLT will focus on technology development to increase safety and reliability and reduce overall costs associated with building, flying and maintaining the nation's nextgenerations of space launch vehicles. These investments will be guided by systems engineering and analysis with a focus on the needs of National customers. This paper describes the NGLT Program Office's strategy and plans. Current activities, accomplishments, future plans and technologies are discussed.
NASA is working toward the first launch of the Space Launch System, a new, unmatched capability for deep space exploration with launch readiness planned for 2019. Since program start in 2011, SLS has passed several major formal design milestones, and every major element of the vehicle has produced test and flight hardware. The SLS approach to systems engineering has been key to the program's success. Key aspects of the SLS SE&I approach include: 1) minimizing the number of requirements, 2) elimination of explicit verification requirements, 3) use of certified models of subsystem capability in lieu of requirements when appropriate and 4) certification of capability beyond minimum required capability.
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