摘要
为进一步提高变压器的散热性能,提出一种铲削式翅片散热器,针对新型换热器翅片侧的流动与换热特性不明晰的问题,搭建流动换热综合测试平台,研究不同管内流量下,翅片侧空气流量对散热器的换热量和翅片压降的影响规律。结果表明:铲削式翅片散热器的换热量和翅片侧压降均随着翅片侧空气流量的增大而增大,在一定的翅片侧流量范围内,换热量与流量近似成线性关系;随着管道侧空气流量增大,散热器的换热量增大,翅片侧压降则几乎不受影响。此外,基于Wilson热阻分离法获得翅片侧对流换热关联式,并采用最小二乘法拟合翅片侧阻力关联式,分别与之前数值仿真工作获得的换热阻力关联式进行对比,换热关联式平均误差为9.19%,阻力关联式平均误差为16.36%,试验拟合的关联式具有较好的可靠性,能为铲削式翅片散热器在户内变电站的应用提供参考与设计依据。
In order to improve the heat dissipation performance of the transformers,a shovel-fin heat exchanger was proposed in this paper.The heat transfer and flow characteristics for the fin side of new type heat exchanger was unclear,and a test system was built to conduct the flow and heat transfer experiment.The influences of air flow rate on the flow and heat transfer characteristics were investigated under the conditions of different flow rates in the tube.The results indicate that the heat transfer rate and the pressure drop on the fin-side increased with the increase of the fin-side airflow.In a certain range,the heat transfer rate was approximately related linearly to the airflow of the fin-side.The heat transfer rate increased with the increase of the airflow of the tube-side,but the pressure drop on the fin side was almost unaffected by the tube-side airflow.Then the convective heat transfer correlation of the fin-side was done by the Wilson thermal resistance separation and the fin-side flow resistance correlation was done by the least-square theory.The correlations obtained in this experiment were compared with the correlations obtained by simulation fitting in the previous one,the results show that the average error of the convective heat transfer correlation was 9.19%and the average error of the fin-side flow resistance correlation was 16.36%.The results indicated that the correlations obtained in this experiment show good reliability,which could provide a reference and design basis for the application of shovel-fin heat exchanger in an indoor substation.
作者
白晓春
朱超
王绿
林子博
苗阿乐
杨鹏
刘迎文
BAI Xiaochun;ZHU Chao;WANG Lyu;LIN Zibo;MIAO Ale;YANG Peng;LIU Yingwen(Shaanxi Electric Power Research Institute of State Grid Corporation of China,Xi’an 710000,China;Key Laboratory of Thermo-Fluid Science and Engineering of MOE,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《西安科技大学学报》
CAS
北大核心
2023年第4期658-666,共9页
Journal of Xi’an University of Science and Technology
基金
国家电网公司总部科技项目(5226SX21001C)。
关键词
变电站
散热器
铲削式翅片
传热特性
阻力特性
Wilson热阻分离法
substation
heat exchanger
shove-fin
heat transfer characteristic
flow resistance characteristic
Wilson thermal resistance separation
