| 摘要: |
| 为了研究V型肋分布形式和截面形状对带肋通道表面的换热强度和流动结构的影响，采用瞬态液晶实验和数值模拟相结合的方法，对截面形状为三角形的V肋和反向V肋在不同雷诺数工况下的表面换热系数分布规律进行了研究，并分析了V肋和反向V肋诱导产生的肋间涡的发展特性，并与传统矩形截面肋结构进行了对比分析。结果表明：带肋通道表面换热系数随雷诺数增大而增大；正向V肋后换热系数呈“心”型分布，在一条肋两支之间诱导一对涡，并沿流向向两侧发展，三角形截面肋的高换热区更集中于中线；反向V肋后换热系数呈“八”字型分布，在一条肋两支外侧诱导对涡，沿流向向中间发展，且三角形肋的展向范围更大。三角形截面肋的换热强于矩形截面肋，且当入口雷诺数低于2.5×104时，三角形反向V肋的换热效果最好。 |
| 关键词: 三角形肋 V肋 反向V肋 换热系数 诱导涡 |
| DOI：10.13675/j.cnki. tjjs. 180710 |
| 分类号:V231.1 |
| 基金项目:中央高校基本科研业务费中国民航大学专项 3122018C034;中国民航大学科研启动基金项目 2017QD06S中央高校基本科研业务费中国民航大学专项（3122018C034）；中国民航大学科研启动基金项目（2017QD06S）。 |
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| Investigation on Heat Transfer Augmentation in a Inner-Cooling Passage with Triangular V-Shaped and Inverse V-Shaped Ribs |
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LIU Cong1,WANG Zhao2,ZHANG Zong-wei3
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1.College of Aircraft Traffic Management,Civil Aviation University of China,Tianjin 300300，China;2.Shanghai Aerospace System Engineering Institute,Shanghai 201108，China;3.College of Aeronautical Mechanics Engineering,Civil Aviation University of China,Tianjin 300300，China
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| Abstract: |
| In order to investigate the effects of V-shaped rib arrangement and the shape of their section on heat transfer and flow structure near the ribbed channel surface, the distribution of heat transfer coefficient of V-shaped and inverse V-shaped ribs with triangular section shape at different Reynolds number conditions are studied experimentally using transient liquid crystal technique and CFD. The development characteristics of vortex induced by V-shaped and inverse V-shaped ribs are analyzed using numerical simulation. These results are also compared with that of traditional rectangular ribs. Results show that the heat transfer coefficient on ribbed channel surface increases with the increase of Reynolds number. The heat transfer coefficient distribute with a shape of “heart” behind the V-shaped ribs, and a pair of vortex are induced between the two branches of every rib, and develop laterally along the flow direction. The high heat transfer area of triangular ribs is more concentrated to the middle line than rectangular ribs. The heat transfer coefficient distribute with a shape of chinese word “eight” behind the inverse V-shaped ribs, and a pair of vortex are induced outside the two branches of every rib and develop to the middle line. The vortexes induced by triangular ribs have a wider lateral range. Thus the heat transfer of triangular ribs is stronger than that of rectangular ribs and the triangular inverse V-shaped ribs perform better when the inlet Reynolds number is below 2.5×104. |
| Key words: Triangular rib V-shaped rib Inverse V-shaped rib Heat transfer coefficient Induced vortex |
