TY - GEN
T1 - Measurement of temperature and water vapor concentration using laser absorption spectroscopy in kilogram-scale explosive fireballs
AU - Soo, Michael
AU - Murzyn, Chris
AU - Sims, Adam
AU - Cerow, Jay
AU - Glumac, Nick
AU - Ott, James
AU - DeMagistris, Michael
AU - Sinha, Neeraj
AU - Lightstone, James
N1 - Publisher Copyright:
© 2020 American Institute of Physics Inc.. All rights reserved.
PY - 2020/11/2
Y1 - 2020/11/2
N2 - The temperature, water vapor concentration, and pressure within a kilogram-scale high-explosive fireball are probed using a custom, tunable diode laser absorption spectroscopy setup housed in a ruggedized gauge. Explosive fireballs are generated by the detonation of 2.2 kg spherical charges of C-4 high explosive at one end of a partially enclosed concrete tunnel structure. The 0.3 m fixed path-length absorption gauge is placed at varying stand-off distances from the charge at 6.4 m, 3.9 m, and 2.4 m, over several tests, to show survivability, measurement quality, and a repeatability. Changing the explosive composition to a 2.2 kg aluminized charge resulted in an explosive fireball that caused heavy beam attenuation at a 2.4 m stand-off distance due to the presence of added condensed-phase material. Reliable temperature measurements in the aluminized charge fireball were not possible due to the low signal-to-noise ratio and distortion of the background signal. Numerical simulations of the explosion in the hallway structure are performed using the CRAFT computational fluid dynamics code. While the simulations demonstrate general agreement with the hydrostatic pressure features measured in the experiment, the model predicts temperatures significantly higher than the temperature sensitivity limit of the probed spectral band feature and exhibits fluctuations of temperature on the order of several hundred kelvin due to turbulence.
AB - The temperature, water vapor concentration, and pressure within a kilogram-scale high-explosive fireball are probed using a custom, tunable diode laser absorption spectroscopy setup housed in a ruggedized gauge. Explosive fireballs are generated by the detonation of 2.2 kg spherical charges of C-4 high explosive at one end of a partially enclosed concrete tunnel structure. The 0.3 m fixed path-length absorption gauge is placed at varying stand-off distances from the charge at 6.4 m, 3.9 m, and 2.4 m, over several tests, to show survivability, measurement quality, and a repeatability. Changing the explosive composition to a 2.2 kg aluminized charge resulted in an explosive fireball that caused heavy beam attenuation at a 2.4 m stand-off distance due to the presence of added condensed-phase material. Reliable temperature measurements in the aluminized charge fireball were not possible due to the low signal-to-noise ratio and distortion of the background signal. Numerical simulations of the explosion in the hallway structure are performed using the CRAFT computational fluid dynamics code. While the simulations demonstrate general agreement with the hydrostatic pressure features measured in the experiment, the model predicts temperatures significantly higher than the temperature sensitivity limit of the probed spectral band feature and exhibits fluctuations of temperature on the order of several hundred kelvin due to turbulence.
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U2 - 10.1063/12.0000928
DO - 10.1063/12.0000928
M3 - Conference contribution
AN - SCOPUS:85096455450
T3 - AIP Conference Proceedings
BT - Shock Compression of Condensed Matter - 2019
A2 - Lane, J. Matthew D.
A2 - Germann, Timothy C.
A2 - Armstrong, Michael R.
A2 - Wixom, Ryan
A2 - Damm, David
A2 - Zaug, Joseph
PB - American Institute of Physics Inc.
T2 - 21st Biennial American Physical Society Conference on Shock Compression of Condensed Matter, SCCM 2019
Y2 - 16 June 2019 through 21 June 2019
ER -