蒸汽-水膜直接接触冷凝数值模拟研究  

Numerical Simulation on Steam-Water Film Direct Contact Condensation

作　　者：柴盈华 林原胜[1] 黄崇海 肖颀 柯汉兵[1] 李邦明 CHAI Yinghua;LIN Yuansheng;HUANG Chonghai;XIAO Qi;KE Hanbing;LI Bangming(Wuhan Second Ship Design and Research Institute,Wuhan 430205,China)

机构地区：[1]武汉第二船舶设计研究所,武汉430205

出　　处：《动力工程学报》2024年第11期1672-1679,共8页Journal of Chinese Society of Power Engineering

摘　　要：蒸汽-水膜直接接触冷凝界面能质传递机理是混合式冷凝器优化设计的基础,以蒸汽-水膜直接接触冷凝为研究对象,基于流体体积(VOF)方法构建了界面相变冷凝能质传递模型,分析了蒸汽质量流量(0.002~0.010 kg/s)、冷却水质量流量(0.30~0.83 kg/s)及流动方向对蒸汽-水膜直接接触冷凝换热的影响。结果表明:冷凝传热系数随蒸汽和冷却水质量流量的增大而增大,相较而言蒸汽质量流量对冷凝换热影响较弱;相比于顺流流动,蒸汽-水膜错流流动时换热效果较好,逆流流动由于相间作用力增加,水膜形状不规则,增大了水膜破碎风险。Steam-water film interfacial energy and mass transfer mechanism of direct contact condensation is the basis for the optimization design of mixing condensers.Taking steam-water film direct contact condensation as the research object,a film interfacial condensation energy and mass transfer model was established based on the volume of fluid(VOF)model.The impact of varying steam and water mass flow rate ranging in 0.002-0.010 kg/s and 0.30-0.83 kg/s respectively,as well as the influence of flow pattern,on the heat exchange of steam-water film direct contact condensation were analyzed.Results show that the heat transfer coefficient increases with the water and steam mass flow rate.The steam mass flow rate has little influence than the water mass flow rate on direct contact condensation.Compared with the parallel flow,cross flow proves to be more favorable for the heat transfer process.Due to the increased interphase force and irregular shape of the water film,the risk of water film breakage increases in the countercurrent flow condition.

关 键 词：水膜 直接接触冷凝 VOF 传热系数 

分 类 号：TK125[动力工程及工程热物理—工程热物理]