方形蓄热单元内铝铜合金熔化和凝固特性数值模拟  

NUMERICAL SIMULATION ON MELTING AND SOLIDIFICATION BEHAVIORS OF Al-Cu ALLOY IN SQUARE HEAT STORAGE UNIT

作　　者：崔富 袁艳平[1] 曹晓玲[1] 孙亮亮[1] 向楠 Cui Fu;Yuan Yanping;Cao Xiaoling;Sun Liangliang;Xiang Nan(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学机械工程学院

出　　处：《太阳能学报》2018年第7期1797-1806,共10页Acta Energiae Solaris Sinica

基　　金：建筑环境与能源高效利用四川省青年科技创新研究团队项目(2015TD0015);国家自然科学基金面上项目(51678488)

摘　　要：对中心带有恒温换热圆管的方形蓄热单元内铝铜合金的熔化和凝固过程进行数值模拟,研究相变材料（PCM）的熔化和凝固特性以及蓄热单元宽高比对PCM熔化和凝固特性的影响,并探讨蓄热面积系数对蓄热单元最佳宽高比的影响。结果显示,对于中心换热管直径为20mm、横截面积为6400mm^2的方形蓄热单元,PCM的熔化和凝固时间均随宽高比的增加呈现先缩短后增长的变化趋势,且当宽高比为1.56时,PCM的熔化时间最短,定义其为该潜热蓄热量条件下蓄热单元的最佳熔化宽高比;当宽高比为1.00时,PCM的凝固时间最短,定义其为方形蓄热单元的最佳凝固宽高比。此外,当蓄热面积系数增加时,蓄热单元的最佳熔化宽高比出现增大趋势,而最佳凝固宽高比保持不变。方形蓄热单元的宽高比应结合实际应用条件进行合理选择。The melting and solidification process of Al-Cu alloy was simulated numerically in square heat storage unitwhich has an isothermal circular heat exchange tube inside.The melting and solidification behaviors of PCM and theeffect of ratio of width-height on the melting and solidification behaviors of PCM were studied.And the effect of heatstorage area coefficient on the optimum ratio of width-height of heat storage unit was discussed.The results showed thatfor a square heat storage unit with 20 mm diameter of the center heating tube and 6400 mm2 cross-sectional area,themelting and solidification time of PCM are first decreasing and then increasing with the increase of ratio of width-height.Especially,when the ratio of width-height is 1.56,the melting time of PCM is shortest,and this ratio of width-height isdefined as the optimum melting ratio of width-height.When the ratio of width-height is 1,the solidification time of PCMis shortest,and this ratio of width-height is defined as the optimum solidification ratio of width-height.Besides,with heatstorage area coefficient increasing,the optimum melting ratio of width-height of heat storage unit presents an increasingtrend,and the optimum solidification ratio of width-height of heat storage unit remains unchanged.The ratio of widthheight of square heat storage unit should be reasonably selected according to the practical application conditions.

关 键 词：潜热蓄热 铝铜合金 熔化和凝固特性 数值模拟 

分 类 号：TK512.4[动力工程及工程热物理—热能工程]