圆形和方形双斜向流线型内肋管内对流换热的数值模拟与分析  

Numerical Simulation and Analysis of the Convection Heat Transfer in Circular and Square Double-Inclined Streamline Ribs(DISR)Tubes

作　　者：徐承隆 刘伟军[2] 胡伟平[1] 

机构地区：[1]上海工程技术大学汽车工程学院,上海201620 [2]上海工程技术大学机械工程学院,上海201620

出　　处：《西南大学学报（自然科学版）》2015年第8期169-175,共7页Journal of Southwest University(Natural Science Edition)

基　　金：上海市教委内涵建设资助项目(nhky-2012-05)

摘　　要：使用FLUENT对圆形和方形双斜向流线型内肋换热管进行了数值模拟研究.结果表明,圆形和方形双斜向流线型内肋管的内肋在肋长、肋倾角、肋高度和肋间距上存在最优值,l=38mm,α=45°,h=2.5mm,P=60mm和l=32mm,α=45°,h=4mm,P=60mm,同功耗强化指标PEC均呈先升后降的趋势.从管壁表面换热系数、管内场协同角和PEC评价指标3个方面,比较圆形DISR管和方形DISR管的对流换热性能,分析了圆形DISR管优于方形DISR管的原因.A numerical simulation was carried out for the convection heat transfer in circular and square doubleinclined streamline ribs （DISR） tubes by FLUENT. The results showed that the optimal parameters were： rib length （l=38 mm）, rib inclined degree （a=45°） , rib height （h=2. 5 mm） and rib pitch （P=60 mm） for circular DISR tubes, and rib length （l = 38 mm）, rib inclined degree （a= 45°） , rib height （h = 4 mm） and rib pitch （P= 60mm） for square DISR tubes. The PEC number increased firstly and decreased finally. The performance of convection heat transfer of circular and square DISR tubes was compared from the perspectives of wall surface heat transfer coefficient, field synergy angle and PEC number, and the reason of better heat transfer performance of circular DISR tubes than that of their square counterparts was discussed.

关 键 词：汽车尾气 强化换热 场协同 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]