Abstract
Thermochemical nonequilibrium behind a strong argon shock wave with precursor photoionization was numerically investigated using a simple blackbody surface emitter model. The propagation Mach number of the shock wave is 41. Results showed that precursor photoionization drastically reduces the nonequilibrium region because electrons produced in the precursor region accelerates electron-impact ionization behind the shock wave. In addition, the computation reproduced the distribution of the measured electron number density behind the shock wave, although it overestimated the electron number density in the precursor region due to ignoring indirect photoionization from the photoexcited state of argon in the computation.
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