本文研究了湿蒸汽流中的非均质凝结流动现象,建立了自发凝结流动和非均质凝结流动统一的数值模型,并对一维喷管中的非均质凝结流动进行了数值分析.结果表明,蒸汽中杂质微粒浓度是影响非均质凝结流动的主要因素,在微粒浓度达到1013～1014/kg后杂质开始对凝结流动产生明显影响;在微粒浓度约为1014～1016/kg的范围内,外来凝结核并没有抑制流动热力学不平衡的发展,反而使其程度加深;在微粒浓度大于1017～1018/kg的情况下,足够多的外来凝结核充分抑制了非平衡条件下的自发凝结,整个流动过程中蒸汽始终处于平衡态附近.此外,微粒半径等因素对非均质凝结流动也有影响.
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