采用FLUENT软件对具有不同结构参数的等节距缩放管进行了对流传热数值模拟,研究了缩放角θ、喉径比γ及节距L对传热性能的影响，并用场协同理论进行传热强化分析。结果表明：雷诺数Re在4 138~5 977范围内，缩放角θ越大，努塞尔数Nu越大，压降Δp急剧增大；喉径比γ越小，努塞尔数Nu越大，压降Δp急剧增大；节距L在30~50 mm范围内，随雷诺数Re增大，节距L增加，努塞尔数Nu增大；在50~60 mm范围内，随雷诺数Re增大，节距L增加，努塞尔数Nu基本保持不变；等节距缩放管的缩放节能改善管内流体速度场和热流场的协同程度，提升管内对流传热水平。

The convective heat transfer numerical simulation of equal pitch convergingdiverging tubes with different structural parameters was carried out by using FLUENT.The effects of convergingdiverging angle θ,throat diameter ratio γ and pitch L on heat transfer performance were studied，and the heat transfer enhancement analysis was carried out based on the field synergy theory.The results indicated that: at 4 138<Re<5 977,the larger the convergingdiverging angle θ,the larger Nu and the sharper increase of Δp.The smaller the throat ratio γ,the larger Nu and the sharper increase of Δp.When the pitch L is in the range of 30 mm to 50 mm,as Re increases,the pitch L increases and Nu increases.When it is in the range of 50 mm to 60 mm,as Re increases,the pitch L increases and Nu remains unchanged.According to the analysis of the field synergy principle,the scaling energy section of the equalpitch convergingdiverging tube improves the synergy between the fluid velocity field and the heat flow field in the tube,thus improving the convective heat transfer level in the tube.

TK124

国家自然科学基金(51806041)；广东省自然科学基金（2018A0303130013）；广东省科技计划项目（2014A040401044）