The application of both the vortex generators and twisted belts were investigated in literature as they are effective in improving heat exchanger thermal performance. In this paper, a novel method to enhance the heat exchanger thermal performances obtained by combining the vortex generator and twisted belt is proposed. The circular tube thermo-hydraulic characteristics were numerically studied by combining the twisted belt and delta wing vortex generators (DWVGs). The effects of twist ratio, attack angles, pitch and vortex generator arrangement were investigated. The emphasis was put on obtaining the optimal parameters. The Reynolds number was based on the hydraulic diameter channel flow, which ranged from 5000 to 25,000. The results indicate that the most favorable vortex generator arrangement is staggered arrangement when the twisted belt twists counter-clockwise. The optimal twist ratio is 4, and PEC increases with the increase in the angle of attack and decrease of the vortex generator pitch. When considering the conditions studied in this paper, the PEC can be improved by 96% ~ 128% compared with the smooth tube. Said improvements are mostly obtained when using the novel combination structures with the staggered arrangement, optimal twist ratio of 4, attack angle of 75°, and pitch of 1.5D.

文献中研究了涡流发生器和扭曲带的应用，因为它们可有效提高换热器的热性能。在本文中，提出了一种通过结合涡流发生器和扭曲带来提高换热器热性能的新方法。通过将扭曲带和三角翼涡流发生器（DWVGs）相结合，对圆管热工水力特性进行了数值研究。研究了扭曲比、攻角、螺距和涡流发生器布置的影响。重点放在获得最佳参数上。雷诺数基于水力直径通道流量，范围从 5000 到 25,000。结果表明，当扭曲带逆时针扭曲时，最有利的涡流发生器布置是交错布置。最佳捻比为4，PEC随着攻角的增加和涡流发生器螺距的减小而增加。在考虑本文研究的条件时，PEC 与光滑管相比可提高 96% ~ 128%。这些改进主要是在采用交错排列、最佳捻比为4、攻角为75°、节距为1.5的新型组合结构时获得的d。