有/无多孔介质的矩形T型管道内蒸汽 直接接触凝结流型的实验研究

采用高速摄影仪,对填充和未填充球形多孔介质的矩形T型管道内蒸汽直接接触凝结流型进行了可视化实验研究。研究发现未填充多孔介质条件下存在五种典型凝结流型:间歇凝结、振荡射流、稳态射流、尾部振荡射流和发散射流;填充多孔介质条件下则存在三种典型凝结流型:振荡射流、弹状稳定射流和雾状稳定射流。研究表明:多孔介质对凝结流型及汽羽形状有显著影响;由于多孔介质内部的黏滞阻力和惯性阻力,填充多孔介质的凝结流型类型减少;随着蒸汽流量的增加,凝结流型较快的进入到稳定状态,削弱了蒸汽直接接触凝结汽羽的振荡。

Experimental study of flow pattern for direct contact condensation in rectangular T-junction with and without porous media

the visual experiments of steam direct contact condensation in a rectangular T-junction with and without porous media were studied by high speed photography. The experimental results show that there are five typical flow pattern of the cases without porous media include: chugging condensation, oscillatory jet flow, stable jet flow, tail oscillatory jet flow and divergent jet flow, and three typical flow pattern of the cases with porous media conditions include: oscillatory jet flow, stable slug jet flow, stable fog jet flow. And the porous media has a significant effect on the condensation flow pattern and the shape of the steam plume. Due to the viscous resistance and inertial resistance, the condensed flow pattern of the cases with porous media is less than them without porous media. With the increase of steam flow, the condensation flow pattern enters the steady state quickly and the fluctuation of the steam plume was weakened.