The phenomenon of unsteady condensation of moist air was studied in an ideal two-dimensional oscillation tube model-shock tube model with numerical method. The computational results were compared with the previous experimental data. The results obtained showed that the field structure and parameters changed dramatically with the interaction of condensation shock and flow field. Condensation occurred in the tail of expansion wave. The jump of temperature and pressure was more sensitive to the growth stage of drops than to the initial stage of nucleation. The space distribution of nucleation changed with time and gradually expanded. The rise of nucleation rate at the initial stage was larger than the drop of nucleation rate after the nucleation peak. Furthermore, the nucleation intensity, the space of nucleation and the location of its occurrence changed with the initial relative humidity and pressure ratio.%引言rn天然气处理、输运过程中常采用节流制冷工艺,由于节流过程是一个不可逆熵增过程,效率比较低,这会导致压力能的较大浪费.根据已有的研究结果[1]:非定常流动的过程效率高于稳定流动的过程效率.基于非定常、交变流动过程的高效气波技术装备如气波制冷机,用于天然气处理具有优越性[2-4].含湿气体在快速膨胀过程中,由于没有凝结核心,水蒸气会偏离饱和平衡态而发生自发凝结现象[5-7],对流场会产生扰动.
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