基于CFD的直角六边形人工粗糙度元素太阳能空气集热器的数值模拟  

Numerical simulation of a right-angle hexagonal artificial roughness solar air collector based on CFD

作　　者：郭雪妍 夏鹏 谢绍樟 许世成 Guo Xueyan;Xia Peng;Xie Shaozhang;Xu Shicheng(Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学,黑龙江哈尔滨150040

出　　处：《可再生能源》2025年第1期27-35,共9页Renewable Energy Resources

基　　金：国家自然科学基金(11572098);中央高校基本科研业务费专项基金(2572021BF06)。

摘　　要：带有光滑吸热板的太阳能空气集热器传热效率很低,在吸收板上使用人工粗糙度元素能中断边界层,提高系统的传热效率。文章在矩形人工粗糙度元素的基础上进行改进,使用ANSYS FLUENT对带有直角六边形粗糙度的太阳能空气集热器进行二维模拟;在特定雷诺数范围内,讨论了人工粗糙度元素间距对传热效率和流动特性的影响,并对其热工水力性能(THPP)进行评价;使用有限体积法求解控制方程,RNG k-ε湍流模型求解湍动能和湍动能耗散率的输运方程。结果表明,与光滑吸热板相比,加入直角六边形人工粗糙度元素后显著提高了系统的传热效果。当雷诺数Re=4000、间距p=10 mm时,太阳能空气集热器的传热性能和压力损失保持最佳比例,系统最大的热工水力系数THPP=1.76,是相同几何参数下矩形人工粗糙度元素的1.6倍。The heat transfer efficiency of the solar air collector with smooth heat absorption plate is very low.Using artificial roughness on the absorption plate can interrupt the boundary layer and improve the heat transfer efficiency of the system.The improvement is made based on the rectangular artificial roughness,and a two-dimensional simulation of the solar air collector with the right-angle hexagonal artificial roughness is performed using ANSYS FLUENT.The influence of artificial roughness spacing on heat transfer efficiency and flow characteristics in the specific Reynolds number range is discussed,and the thermo-hydraulic performance is evaluated under different working conditions.The governing equations are solved using the finite volume method and the transport equations of the turbulent kinetic energy and the turbulent dissipation rate are solved using the RNG k-ε turbulence model.The result show that the heat transfer characteristic of the system is significantly improved by the addition of the right-angle hexagonal artificial roughness compared to the smooth plate.The right-angle hexagonal artificial roughness with p=10mm had the maximum THPP of 1.76 at Re=4000,which is 1.6 times the artificial roughness of the rectangle under the same geometric parameters.

关 键 词：太阳能空气集热器 CFD 直角六边形人工粗糙度元素 传热分析 

分 类 号：TK521[动力工程及工程热物理—热能工程]