含内热源有序饱和多孔介质通道内蒸汽-水两相流型可视化实验研究

Flow Visualization Study of Steam-Water Two-phase Flow Phenomena in a Saturated Porous Structure with Internal Heat Source

采用均一球体形成多孔介质通道,通过高速摄像系统获得了多孔介质通道内两相流动影像数据,识别出多孔介质通道内蒸汽-水两相流动流型存在形式,幵研究了部分参数对流型转变的影响觃律。结果表明,多孔介质通道内的汽-液两相流型有泡状流、泡状-弹状混合流、弹状流、弹状-环状混合流以及环状流5种;随着入口过冷度的增加,泡状流向过渡流转变以及过渡流向环状流转变时所对应的汽相表观速度呈现出逐渐增大的趋势;随着压力的升高,泡状流向过渡流转变以及过渡流向环状流转变时所对应的汽相表观速度呈现出逐渐减小的趋势。

An visualization experiment was conducted to study the steam-water two-phase flow phenomena in a saturated porous structure with internal heat source.The porous structure was formed by stacking uniform spheres.The two-phase flow phenomena in porous media were obtained by high-speed camera system and the flow regimes was identified.The influence of pressure and inlet subcooling on the flow regimes was also investigated.The results of visualization experiment show that the flow regimes in porous channel are bubbly flow,bubbly-slug mixed flow,slug flow,slug-annular mixed flow and annular flow.The results also show that the bubbly to transitional flow transition and the transitional to annual flow transition appear at lower superficial steam velocity in the channel with the lower inlet subcooling.The present study also show that the bubbly to transitional flow transition and the transitional to annual flow transition appear at lower superficial steam velocity in the channel with the higher pressure.