喷洒器蒸汽浸没射流汽羽长度实验研究

Experimental Investigation on Plume Length of Submerged Steam Jet through Spargers

以孔径分别为4、10、16 mm的侧开孔I型喷洒器为实验件,对质量流速为300~1100 kg·m^(-2)·s^(-1)的饱和蒸汽浸没在温度为35~65℃的过冷水中的直接接触式冷凝开展实验研究。结果表明:孔径不变时,汽羽贯穿长度基本随蒸汽质量流速和池水温度的升高而增大;大孔径喷洒器的汽羽长度与直管式喷嘴的汽羽长度接近,拟合值与实验值的偏差在±15%以内;小孔径喷洒器的汽羽长度明显低于直管式喷嘴,拟合值与实验值的偏差最高达80%;采用收缩喷管流量公式对蒸汽质量流速进行修正,拟合值与实验值的偏差在±20%以内,由实验值拟合的新关系式的预测误差在±10%以内。

The direct contact condensation of saturated steam with a mass flux between 300 and 1100 kg·m^(−2)·s^(−1) submerged in the subcooled water at a temperature of 35 to 65℃was studied experimentally with I-type side-opening spargers,which apertures were 4,10 and 16 mm,respectively.The results show that:when the aperture is fixed,the penetration length of the steam plume increases with the increasing of the steam mass flux and the pool water temperature.The penetration length of the steam plume through a large-opening sparger is close to that through a straight nozzle,and the deviation between the fitting value and the experimental value is within±15%.The penetration length of the steam plume through a small-opening sparger is obviously lower than that through a straight nozzle,and the deviation between the fitting value and the experimental value is up to 80%.The steam mass flux is re-calculated utilizing the correlation specified for a contraction nozzle to consider the injecting characteristic of an I-type sparger,and the deviation between the fitted value and the experimental value is within±20%.A new semi-empirical correlation is fitted and the discrepancy between the prediction and the experimental value is within±10%.