Monte Carlo simulation of radiating reentry flows

The direct simulation Monte Carlo method is applied to a radiating, hypersonic, axisymmetric flow over a blunt body in the near continuum regime. The ability of the method to predict the flowfield radiation and the radiative heating is investigated for flow over the Project Fire II configuration at 11.36 km/s at an altitude of 76.42 km. Two methods that differ in the manner in which they treat ionization and estimate electronic excitation are employed. The calculated results are presented and compared with both experimental data and solutions where radiation effects were not included. Differences in the results are discussed. Both methods ignore self absorption and, as a result, overpredict measured radiative heating. Nomenclature A = transition probability g = degeneracy h = Planck's constant, J s K = excitation rate coefficient M = third body

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