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中文摘要：
本文针对质量流量376-773kg^-2·s^-1的饱和蒸汽在温度变化范围为10-55℃流动水中形成的音速蒸汽射流凝结进行了实验研究。实验观察到了四种不同的汽羽形状，并且汽羽形状受Re影响较大。当Re与凝结驱动势减小时，最大膨胀比和汽羽喷射长度增大，其值小于蒸汽音速射流在静止水中的情况。本文给出了汽羽喷射长度实验关联式，大多数实验数据与预测值的误差小于10％。
英文摘要：
A series of experiments on sonic saturated steam injected into moving water in a vertical circular pipe were carried out. The inlet steam flow rate and the subcooled water temperature were in the range of 376-773 kg.m^-2-s^-1and 10-55℃, respectively. Four different steam plume shapes （contraction, expansion-contraction, double expansion-contraction, and unstable jet） were typically observed. The results indicated that the steam plume shapes were significantly influenced by the Reynolds number. The maximum expansion ratio and the steam plume length increased with the decrease of Reynolds number and the condensation driving potential, and the values were lower than that of sonic steam jet condensation in stagnant water. Empirical correlation for the dimensionless stemn plume length was established, and most of the measured data lay within the range of ＋10% and -8（%） of the correlation.
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