螺旋肋片同心套管相变储热单元储热特性分析与结构参数优化  

Heat Storage Characteristic Analysis and Structure Parameter Optimization of Phase Change Heat Storage Unit With Spiral Fin Concentric Sleeve

作　　者：高龙[1] 王鹏[1] 白俊超 孙佰仲[1] 车德勇[1] 李少华[1] GAO Long;WANG Peng;BAI Junchao;SUN Baizhong;CHE Deyong;LI Shaohua(School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林省吉林市132012

出　　处：《中国电机工程学报》2020年第15期4945-4954,共10页Proceedings of the CSEE

基　　金：国家重点研发项目(2018YFB0905104);吉林省科技厅项目(20180201006SF)。

摘　　要：以填充棕榈酸的同心套管相变储热单元为研究对象。建立储热性能试验系统,并应用数值模拟方法模拟相变传热过程。通过实验与模拟结果对比,验证数值计算方法的准确性。研究了螺旋肋片结构对储热单元的强化传热特性,以及无量纲螺距和无量纲肋高对熔化过程的影响。研究结果表明:螺旋肋片结构在肋片导热和相变材料局部自然对流的共同作用机制下显著缩短充热时间,熔化速率呈先增大后减小的趋势;减小螺距、增加肋高可缩短充热时间,但减少储热量;综合充热时间、储热量和平均热流密度分析,通过单因素优化获得无量纲螺距和肋高的参数组合为0.24和0.59,该结构下充热时长240min,平均热流密度1056W/m2。In this paper,a concentric trocar phase change heat storage unit filled with palmitate acid was studied.The thermal storage performance test system was established and the phase change heat transfer process was simulated by numerical simulation.By comparing the experimental results with the simulation results,the accuracy of the numerical calculation method was verified.The enhanced heat transfer characteristics of helical rib structure on heat storage unit and the influence of dimensionless pitch and dimensionless rib height on melting process were studied.The results show that under the combined action mechanism of heat conduction and local natural convection of phase change material(PCM),the heating charge time is significantly shortened,and the melting rate increases first and then decreases.Reducing the pitch and increasing the rib height can shorten the charging time,but reduce the heat storage.Based on the analysis of charging time,heat storage and average heat flux,the parameter combinations of dimensionless pitch and rib height are 0.24 and 0.59 by single factor optimization.Under the structure,the heating duration was 240 min,and the average heat flux was 1056 W/m^2.

关 键 词：相变储热 螺旋肋片 同心套管 强化传热 熔化特性 结构优化 

分 类 号：TK02[动力工程及工程热物理]