摘要
为了研究雷诺数对风洞换热器性能的影响,采用CFD数值模拟的方法对风洞常规翅片式换热器进行分析。利用NX12.0制作翅片式换热器的三维几何模型,并通过Ansys-Meshing划分网格。使用Fluent 2021R1软件进行模拟仿真计算,研究来流雷诺数对换热器换热性能和阻力性能的影响。由计算可知:2、4和6 mm对应的雷诺数分别为676.79、1353.59和2030.39,雷诺数增大,换热器进出口压降和温差下降,综合换热性能分别提升72.61%和28.28%,但提升效果趋于平缓。在结构参数相同工况下,入口风速增大,所对应的雷诺数分别为1355.09、2710.18、4065.27、5420.35和6775.44。雷诺数增大,换热因子随之减小,风洞换热器的换热特性呈下降趋势,摩擦因子随之减小,风洞换热器的流动阻力呈下降趋势,综合换热因子随之减小,分别下降了9.34%、8.96%、4.79%和5.34%,换热器综合性能随之变差。
In order to study the impact of the Reynold number on the performance of wind tunnel heat exchangers,the CFD numerical simulation method was employed to analyze a conventional finned-type heat exchanger in a wind tunnel.Firstly,a three-dimensional geometric model of the finned-type heat exchanger was created through NX12.0,and then the mesh was generated through Ansys-Meshing.Numerical simulations were carried out using Fluent 2021R1.The numerical simulation mainly focused on the impact of the incoming flow Reynolds number on the heat transfer performance and resistance performance of the heat exchanger.The calculations revealed that corresponding to 2mm,4mm,and 6mm,the Reynolds numbers are 676.79,1353.59,and 2030.39 respectively.As the Reynolds number increases,the pressure drops and temperature difference between the inlet and outlet of the heat exchanger decreases,and the comprehensive heat transfer performance increases by 72.61%and 28.28%respectively.However,the improvement effect tends to be flat.Under identical structural parameters,as the inlet wind velocity increases,the corresponding Reynolds numbers are 1355.09,2710.18,4065.27,5420.354,and 6775.44 respectively.As the Reynolds number increases,the heat transfer factor decreases,and the heat transfer characteristics of the wind tunnel heat exchanger show a downward trend.Meanwhile,the friction factor also decreases,leading to a downward trend in the flow resistance of the wind tunnel heat exchanger.The comprehensive heat transfer factor decreases,which decreases by 9.34%,8.96%,4.79%,and 5.34%respectively.Consequently,the comprehensive performance of the heat exchanger demonstrates progressive deterioration.
作者
吴星慧
李国文
肖敬航
王梓瑞
WU Xinghui;LI Guowen;XIAO Jinghang;WANG Zirui(College of Aero-engine,Shenyang Aerospace University,Shenyang 110136,China)
出处
《沈阳航空航天大学学报》
2025年第4期15-22,共8页
Journal of Shenyang Aerospace University
基金
国家自然科学基金(项目编号:52376028)。
关键词
翅片式换热器
雷诺数
综合换热性能
数值模拟
性能计算
finned-type heat exchanger
Reynolds number
comprehensive heat transfer performance
numerical simulation
performance calculation
