内置环状翼槽式太阳能集热管内传热强化研究

Investigation of Heat Transfer Enhancement in Parabolic Trough Solar Collectors With Built-in Annular Winglet Vortex Generators

本文针对槽式太阳能集热管非均匀受热问题,设计了新型内置环状翼涡发生器,并采用数值模拟对内置环状翼槽式太阳能集热管内传热与流动性能进行了研究。结果表明,环状翼的尾部形成一对纵向涡;该纵向涡可减薄热边界层,并使管内冷热流体混合更加均匀,有效地减少了吸收管的高温区域,同时管壁平均温度降低了35.9~88.1 K,保证了系统的安全运行。

In this paper,novel built-in annular winglet vortex generators were designed to address the problem of non-uniform heating of parabolic trough solar collectors,and numerical simulations were utilized to investigate the heat transfer and fluid flow performance.Results show that annular winglet vortex generators form a pair of longitudinal vortices,which can thin the thermal boundary layer and allow for more uniform mixing of hot and cold fluids in the collector,effectively reducing the high-temperature regions of the collector.Meanwhile,the average temperature of the collector wall is reduced by 35.9∼88.1 K,which ensures the safe operation of the system.