多孔介质结构对储层内流动和换热特性的影响  

Analysis of flow and heat transfer characteristics in porous media reservoir

作　　者：汪健生[1] 张辉鹏 刘雪玲 傅煜郭[1,2] 朱剑啸 WANG Jiansheng;ZHANG Huipeng;LIU Xueling;FU Yuguo;ZHU Jianxiao(Key Laboratory of Efficient Utilization of Low and Medium Grade Energy,Tianjin University,Tianjin 300350,China;Geothermal Research&Training Center,School of Mechanical Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]中低温热能高效利用教育部重点实验室,天津大学,天津300350 [2]天津大学机械工程学院地热研究培训中心,天津300350

出　　处：《化工进展》2023年第8期4212-4220,共9页Chemical Industry and Engineering Progress

摘　　要：针对含水层储能对选址的要求高且存在地下水污染的问题,提出了构建人工填充储层进行储能,并对储层内的局部流动和换热特性进行了研究。采用共轭传热模型分别对填充非均匀颗粒、十二面体梯度开孔和二十面体梯度开孔结构3种多孔介质孔隙内的流动和换热进行了直接数值模拟,对比分析了多孔介质结构对流动和换热特性的影响。研究发现,通过选择合适的填充介质,储层内的综合换热性能能够得到改善,3种多孔介质中十二面体梯度开孔多孔介质的总换热效率(η)最高;非均匀颗粒多孔介质的平均努塞尔数(Nu_(sf))最大,但同时单位压降(△p/△x)与摩擦系数(f)也最大;十二面体梯度开孔多孔介质和二十面体梯度开孔多孔介质的Nu_(sf)随雷诺数(Re)的变化存在交叉,在Re较小时二十面体梯度开孔结构的Nu_(sf)较大,Re较大时十二面体梯度开孔结构的Nu_(sf)较大。Focusing on the problem of high requirements for site selection and groundwater pollution in aquifer energy storage,the construction of artificially filled underground reservoir for energy storage was proposed,and the local flow and heat transfer characteristics in underground reservoir were studied.The conjugate heat transfer model was used to simulate the flow and heat transfer in three kinds of porous media filled with non-uniform particle structure,dodecahedral gradient opening structure and icosahedral gradient opening structure,respectively.The effect of porous media structure on flow and heat transfer characteristics were compared and analyzed.The results indicated that comprehensive heat transfer performance in underground reservoir can be improved by selecting the appropriate filling structure.Among three kinds of porous media,the comprehensive heat transfer efficiency of dodecahedral gradient porous media was the highest.The average Nusselt number of porous media filled with non-uniform particle structure was the largest,but at the same time,the unit pressure drop and friction coefficient were also the largest.With the change of Reynolds number,the Nusselt number of dodecahedral gradient opening structure and icosahedral gradient opening structure intersected.The Nusselt number of icosahedral gradient porous media was larger when Reynolds number was smaller,and the Nusselt number of dodecahedral gradient porous media was larger when Reynolds number was larger.

关 键 词：含水层储能 人工储层 对流换热 多孔介质传热 

分 类 号：TK52[动力工程及工程热物理—热能工程]