基于主动旋转的螺旋翅片储热单元传热性能优化分析  

Analysis of the heat transfer performance of spiral fin heat storage units under active rotation conditions

作　　者：侯立强 阎帅 钮晓博 张文成 胡志鹏 王亚鹏[3] Hou Liqiang;Yan Shuai;Niu Xiaobo;Zhang Wencheng;Hu Zhipeng;Wang Yapeng(China Power Construction Group Shandong Electric Power Construction First Engineering Co.,Ltd.,Ji'nan 250000,China;China Power Construction Group East China Survey,Design and Research Institute Co.,Ltd.,Hangzhou 310000,China;Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]中国电建集团山东电力建设第一工程有限公司,山东济南250000 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州310000 [3]辽宁工程技术大学,辽宁阜新123000

出　　处：《电力科技与环保》2023年第6期553-560,共8页Electric Power Technology and Environmental Protection

基　　金：辽宁省自然基金项目(2019-ZD-0040)。

摘　　要：相变储热技术可有效缓解能源间歇性、不稳定性等问题,在电力灵活性及调度等方面起重要作用。为提高相变储热单元的储热效率,以螺旋翅片相变储热单元为研究对象,通过旋转储热单元内部螺旋翅片从而加快单元内部传热进程,并运用FLUENT软件对螺旋翅片储热单元在不同旋转速率及不同无量纲螺距下的传热过程进行数值模拟分析。结果表明:通过旋转螺旋翅片可以有效提高储热单元的传热效率,螺旋翅片旋转速率分别为3、5、7和10 rev/min的储热单元对比静止工况下储热单元完全熔化时间分别缩短了5000、2750、1250和750 s。在四种旋转速率下,储热单元的熔化强化率在0~6000 s增长迅速,并在6000 s左右达到最大值,3 rev/min的储热单元熔化强化率达到了240%,而10 rev/min的储热单元由于旋转速率过快从而破坏翅片表面对流涡胞,熔化强化率仅为180%。当螺旋翅片体积分数不变、对比其他旋转速率工况,旋转速率为3 rev/min,无量纲螺距P为0.46的储热单元传热效率最好,熔化强化率最大达到了200%。研究结果可为相变储热系统的设计优化提供参考。Phase change heat storage technology can effectively alleviate issues such as energy intermittency and instability,and plays an important role in power flexibility and scheduling.In order to improve the heat storage efficiency of phase change heat storage units,spiral finned phase change heat storage units are taken as the research object.The internal heat transfer process of the unit is accelerated by rotating the spiral fins of the unit with a motor.FLUENT software is used to numerically simulate and analyze the heat transfer process of the spiral fin heat storage unit at different rotation rates and different dimensionless pitches.The results show that the heat transfer efficiency of the heat storage unit can be effectively improved by rotating the spiral fins.The complete melting time of the heat storage unit under static working conditions is shortened by 5000 s,2750 s,1250 s,and 750 s when the rotation rates of the spiral fins are 3 rev/min,5 rev/min,7 rev/min,and 10 rev/min.Under four different rotation rates,the melting strengthening rate of the heat storage unit increases rapidly from 0s to 6000s,and reaches its maximum value around 6000s.The melting strengthening rate of the heat storage unit at 3rev/min reaches 240%,while the melting strengthening rate of the heat storage unit at 10rev/min is only 180% due to the destruction of convective vortices on the surface of the fins due to its fast rotation rate.When the volume fraction of spiral fins remains unchanged and compared to other operating conditions,the heat transfer efficiency of the heat storage unit with a rotation rate of 3rev/min and a dimensionless pitch P of 0.46 is the best,and the maximum melting strengthening rate reaches 200%.The research results can provide reference for the design optimization of phase change heat storage systems.

关 键 词：相变储热单元 传热过程 数值模拟 螺旋翅片 动态旋转 

分 类 号：TK02[动力工程及工程热物理]