Numerical procedures based on the direct simulation Monte Carlo method are presented for determination of electronic energy distributions and gas emission in non-ionized hypersonic flows, with intended application to shock-layer emission analysis for a hypersonic remote sensing platform. The proposed modeling approach enables utilization of experimental state-to-state transition rates, and it differs from earlier approaches by greatly reducing the dependence on excited state populations for statistical scatter in computed energy distributions. Calculations are performed for a low-Knudsen-number Mach 10 flow of reacting air around a blunted wedge, and simulation results are employed to compare gas emission with expected signal intensity along a notional signal path. A particularly strong emission contribution from freestream species is found in the region of continuum breakdown around the bow shock, and it is estimated that gas emission should have a very small but potentially nonnegligible influence on signal reception for a passive sensor near the leading edge of a hypersonic cruise vehicle.
Direct Simulation Monte Carlo Modeling of Gas Electronic Excitation for Hypersonic Sensing
Journal of Thermophysics and Heat Transfer ; 31 , 4 ; 858-870
2017-03-10
13 pages
Article (Journal)
Electronic Resource
English
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