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Investigation of starting transients in the thermally choked ram acceleratorAn experimental investigation of the starting transients of the thermally choked ram accelerator is presented in this paper. Construction of a highly instrumented tube section and instrumentation inserts provide high resolution experimental pressure, luminosity, and electromagnetic data of the starting transients. Data obtained prior to and following the entrance diaphragm show detailed development of shock systems in both combustible and inert mixtures. With an evacuated launch tube, starting the diffuser is possible at any Mach number above the Kantrowitz Mach number. The detrimental effects and possible solutions of higher launch tube pressures and excessive obturator leakage (blow-by) are discussed. Ignition of a combustible mixture is demonstrated with both perforated and solid obturators. The relative advantages and disadvantages of each are discussed. Data obtained from these starting experiments enhance the understanding of the ram accelerator, as well as assist in the validation of unsteady, chemically reacting CFD codes.
Document ID
19930017947
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Burnham, E. A.
(Washington Univ. Seattle, WA, United States)
Hinkey, J. B.
(Washington Univ. Seattle, WA, United States)
Bruckner, A. P.
(Washington Univ. Seattle, WA, United States)
Date Acquired
August 15, 2013
Publication Date
October 1, 1992
Publication Information
Publication: JHU, The 29th JANNAF Combustion Subcommittee Meeting, Volume 1
Subject Category
Spacecraft Propulsion And Power
Accession Number
93N27136
Funding Number(s)
CONTRACT_GRANT: DAAL03-92-G-0100
CONTRACT_GRANT: F49620-92-J-0375
CONTRACT_GRANT: NAG1-1288
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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