Shockwave compression of Ar gas at several initial densities

Experimental data of the principal Hugoniot locus of variable density gas-phase noble and molecular gases are rare. The majority of shock Hugoniot data is either from shock tube experiments on low-pressure gases or from plate impact experiments on cryogenic, liquefied gases. In both cases, physics r...

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Bibliographic Details
Main Authors: Dattelbaum, Dana M., Goodwin, Peter M., Garcia, Daniel B., Gustavsen, Richard L., Lang, John M., Aslam, Tariq D., Sheffield, Stephen A., Gibson, Lloyd L., Morris, John S.
Format: Conference Proceeding
Language:English
Subjects:
Compressibility
Coupling (molecular)
Data compression
Emission
Experiments
Gases
Hugoniot curves
Ionization
Liquefied gases
Loci
Low pressure gases
Molecular gases
Optical fibers
Organic chemistry
Plate impact tests
Rare gases
Streak cameras
Thresholds
Velocimetry
Velocity measurement
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Summary:Experimental data of the principal Hugoniot locus of variable density gas-phase noble and molecular gases are rare. The majority of shock Hugoniot data is either from shock tube experiments on low-pressure gases or from plate impact experiments on cryogenic, liquefied gases. In both cases, physics regarding shock compressibility, thresholds for the on-set of shock-driven ionization, and even dissociation chemistry are difficult to infer for gases at intermediate densities. We have developed an experimental target design for gas gun-driven plate impact experiments on noble gases at initial pressures between 200-1000 psi. Using optical velocimetry, we are able to directly determine both the shock and particle velocities of the gas on the principal Hugoniot locus, as well as clearly differentiate ionization thresholds. The target design also results in multiply shocking the gas in a quasi-isentropic fashion yielding off-Hugoniot compression data. We describe the results of a series of plate impact experiments on Ar with starting densities between 0.02-0.05 g/cm3 at room temperature. Furthermore, by coupling optical fibers to the targets, we have measured the time-resolved optical emission from the shocked gas using a spectrometer coupled to an optical streak camera to spectrally-resolve the emission, and with a 5-color optical pyrometer for temperature determination.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4971623