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Effects of vacuum chamber and reverse flow on supersonic exhaust diffuser starting
Published in American Institute of Aeronautics and Astronautics Inc.
2015
Volume: 31
   
Issue: 2
Pages: 750 - 754
Abstract
A method to reduce the backflow into the vacuum chamber is demonstrated using a backflow arrester. The experimental data for a pre-evacuated large vacuum chamber with a backflow arrester show that the diffuser can be started at a faster rate as compared to the case without a backflow arrester. With regard to the inclusion of a nozzle. From high-altitude simulation experiments with a second throat exhaust diffuser (STED) system, the diffuser starting pressures are found to be nearly the same for a small or large vacuum chamber. However, a pre-evacuated large vacuum chamber requires more time to attain the steady-state cell pressure value than a small vacuum chamber. A large vacuum chamber that is initially started against atmospheric pressure exhibits a still slower starting transient. The hot-flow cases considered in the present study exhibit higher starting pressure values when compared to those of the cold-flow cases. The results indicate that a nozzle with the maximum lip width takes more time for vacuum chamber evacuation, but the nozzle and diffuser flows start very quickly.
About the journal
JournalData powered by TypesetJournal of Propulsion and Power
PublisherData powered by TypesetAmerican Institute of Aeronautics and Astronautics Inc.
ISSN07484658
Impact Factor1.868
Open AccessNo
Citation Styleunsrt
Sherpa RoMEO Archiving PolicyGreen
Concepts (10)
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    Atmospheric pressure
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    CELL PRESSURE
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    FASTER RATES
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    REVERSE FLOW
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    STARTING PRESSURE
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    STARTING TRANSIENT
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    Steady state
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    SUPERSONIC EXHAUST DIFFUSERS
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    Vacuum chambers
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    Nozzles