SF_6凝縮を伴う超音速ノズル内流れの数値計算 : 第2報, 半現象論モデル及び振動エネルギー非平衡計算に基づく解析

概要

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Two-dimensional compressible viscous flow with SF_6 condensation have been calculated with a 3rd-order MUSCL-type TVD scheme in the present study. The calculations are based on either the classical condensation theory by Becker-Doring or a semi-phenomenological droplet model, i. e., Dillmann-Meier's theory. The difference between results of these two kinds of condensation theory was discussed in detail. Comparing those results, it is found that the Dillmann-Meier theory gives an accurate prediction of the condensation onset in a supersonic nozzle without determining the surface tension free parameter. Calculations taking into account the vibrational nonequllibrium effect of SF_6 were also carried out. It was shown from the result that the onset of nucleation varied by taking into account the effect of vibrational nonequilibrium. In particular, the translational temperature became lower in the case of vibrational nonequilibrium than in other cases, because the vibrational relaxation process was almost frozen. In addition, the position of onset and the growth process of SF_6 clusters were obviously affected by the vibrational nonequilibrium process.
1996-01-25