In order to improve the comprehensive performance of convection in tubes inserted with twisted tapes,in the developed 3-edge twisted tape,a simulation was carried out to examine the comprehensive characteristics of single phase convection in circular tubes inserted with twisted tapes,including typical twisted tape,grid spiral twisted tape and 3-edge twisted tape.With water as the working fluid,the behavior of fluid flow and heat transfer of these different types of twisted tapes with the same twist ratio y =2.0 were studied.The RNG k-ε turbulence model was chosen for the Reynolds number ranging from 5 000 to 30 000.The nusselt number(Nu),friction factor(f) and comprehensive performance evaluation factor(η) were calculated and compared with those of a plain tube in the same condition.The results showed that the comprehensive performance of 3-edge twisted tape was better than plain tube,the tubes with typical twisted tape and grid spiral twisted tapes insert.%为了提高内置扭带管的综合性能,开发了一种三边扭带,并对空管、普通扭带管、格栅扭带管及三边扭带管内流体流动与传热特性进行了数值模拟.以水为工质,采用RNG k-ε湍流模型,扭带扭率y=2.0,取Re=5 000～30000,计算了扭带管内努赛尔数Nu、阻力系数f和综合性能评价因子η,与同工况下空管进行了对比.结果表明,相比于空管、普通扭带管和格栅扭带管,三边扭带管的综合性能较好,其η值比空管高出11.9％ ～33.2％.
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