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Measurements of the structure of an ionizing shock wave in a hydrogen-helium mixture.Shock structure during ionization of a hydrogen-helium mixture has been followed using hydrogen line and continuum emission measurements. A reaction scheme is proposed which includes hydrogen dissociation and a two-step excitation-ionization mechanism for hydrogen ionization by atom-atom and atom-electron collisions. Agreement has been achieved between numerical calculations and measurements of emission intensity as a function of time for shock velocities from 13 to 20 km/sec in a 0.208 H2-0.792 He mixture. The electron temperature was found to be significantly different from the heavy particle temperature during much of the ionization process. Similar time histories for H beta and continuum emission indicate upper level populations of hydrogen in equilibrium with the electron concentration during the relaxation process.
Document ID
19730035673
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Leibowitz, L. P. (California Institute of Technology, Jet Propulsion Laboratory, Aerophysics Section, Pasadena Calif., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1973
Publication Information
Publication: Physics of Fluids
Volume: 16
Subject Category
FLUID MECHANICS
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other