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
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摘要
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。
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 patterns without porous media:chugging condensation,oscillatory jet flow,stable jet flow,tail oscillatory jet flow and divergent jet flow,and three typical flow patterns with porous media:oscillatory jet flow,stable slug jet flow and stable fog jet flow.The porous media has a significant effect on the condensation flow patterns and the shape of the steam plume.Due to the viscous resistance and inertial resistance,the condensed flow patterns of the case with porous media are less than that without porous media.As the increase of steam mass flow rate,the condensation flow patterns enter the steady state quickly and the fluctuation of the steam plume was weakened.
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 patterns without porous media:chugging condensation,oscillatory jet flow,stable jet flow,tail oscillatory jet flow and divergent jet flow,and three typical flow patterns with porous media:oscillatory jet flow,stable slug jet flow and stable fog jet flow.The porous media has a significant effect on the condensation flow patterns and the shape of the steam plume.Due to the viscous resistance and inertial resistance,the condensed flow patterns of the case with porous media are less than that without porous media.As the increase of steam mass flow rate,the condensation flow patterns enter the steady state quickly and the fluctuation of the steam plume was weakened.
引文
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[13]杨晓明,孙斌,翟东旭.多孔介质通道气液两相流型及压降特性研究[J].东北电力大学学报,2014(4):1-6.YANG Xiao-ming,SUN Bin,ZHAI Dong-xu.Two-phase flow type and pressure drop characteristics research in porous media channel[J].Journal of Northeast Dianli University,2014(4):1-6.(in Chinese)
[2]武心壮,潘如东,严俊杰.蒸汽浸没射流凝结引起的冲击特性研究[J].工程热物理学报,2012,33(5):805-808.WU Xin-zhuang,PAN Ru-dong,YAN Jun-jie.Research on impact characteristics of steam jet in water[J].Journal of Engineering Thermophysics,2012,33(5):805-808.(in Chinese)
[3]刘光耀,严俊杰,潘冬冬,等.超音速蒸汽射流汽羽形状及压力分布的实验研究[J].工程热物理学报,2010,31(5):781-784.LIU Guang-yao,YAN Jun-jie,PAN Dong-dong,et al.Research on the steam plume shape and pressure fields of supersonic steam jet in subcooled water[J].Journal of Engineering Thermophysics,2010,31(5):781-784.(in Chinese)
[4]曹岩,邵树峰,严俊杰,等.超音速蒸汽浸没射流凝结汽羽形状的实验研究[J].工程热物理学报,2007,28(4):619-621.CAO Yan,SHAO Shu-feng,YAN Jun-jie,et al.Experimental research on the shape of steam plume of supersonic steam jet immerged in subcooled water[J].Journal of Engineering Thermophysics,2007,28(4):619-621.(in Chinese)
[5]PETROVIC De WITH A,CALAY R K,De WITH G.Three-dimensional condensation regime diagram for direct contact condensation of steam injected into water[J].International Journal of Heat and Mass Transfer,2007,50(9-10):1762-1770.
[6]XU Q,GUO L J,ZOU S F,et al.Experimental study on direct contact condensation of stable steam jet in water flow in a vertical pipe[J].International Journal of Heat and Mass Transfer,2013,66:808-817.
[7]武心壮,邵树峰,严俊杰,等.超音速蒸汽浸没射流凝结换热的实验研究[J].工程热物理学报,2009,30(1):73-75.WU Xin-zhuang,SHAO Shu-feng,YAN Jun-jie,et al.Experimental research on condensation heat transfer of supersonic steam jet in subcooled water[J].Journal of Engineering Thermophysics,2009,30(1):73-75.(in Chinese)
[8]李树谦,卢涛,邱庆刚.T型圆管内蒸汽直接接触凝结数值模拟[J].热科学与技术,2016,15(1):33-39.LI Shu-qian,LU Tao,QIU Qing-gang.Simulation of direct contact condensation in tee junction[J].Journal of Thermal Science and Technology,2016,15(1):33-39.(in Chinese)
[9]LI S Q,WANG P,LU T.CFD based approach for modeling steam-water direct contact condensation in subcooled water flow in a tee junction[J].Progress in Nuclear Energy,2015,85:729-746.
[10]LI S Q,LU T,WANG L.Experiment study on steam-water direct contact condensation in water flow in a Tee junction[J].Applied Thermal Engineering,2017,120:99-106.
[11]杨文哲.蒸汽在油藏多孔介质中的热质传递机理及数值模拟[D].大庆:大庆石油学院,2010.YANG Wen-zhe.Heat and Mass Transfer Mechanism and Numerical Simulation of Steam in Reservoir Porous Media[D].Daqing:Daqing Petroleum Institute,2010.(in Chinese)
[12]刘少卿.规整填料内直接接触冷凝传热实验研究[D].天津:天津大学,2013.LIU Shao-qing.Experimental Study of Direct Contact Condensation in Structured Packing[D].Tianjing:Tianjing University,2013.(in Chinese)
[13]杨晓明,孙斌,翟东旭.多孔介质通道气液两相流型及压降特性研究[J].东北电力大学学报,2014(4):1-6.YANG Xiao-ming,SUN Bin,ZHAI Dong-xu.Two-phase flow type and pressure drop characteristics research in porous media channel[J].Journal of Northeast Dianli University,2014(4):1-6.(in Chinese)