【摘要】 提出了三种矩形平翅片的几何变形片， 以矩形平翅片管作为比较对象， 在吸风式直流风洞中进行了开口（ 孔） 侧背风等六种方案的空气外掠单排翅片管的对比性实验研究，得到了具有实用价值的结论。实验证实：在最窄截面风速 Ｕｍａｘ ＝ ３ ～９ ｍ／ｓ 的范围内，ｂ型翅片管在孔侧迎风时， 平均当量换热系数比平翅片管提高了１３ ．４ ％ ； 孔侧背风时， 提高了１１ ％ ，是三种片型中的最优形状。该片型是一种换热性能优异，具有深入研究价值的片型。更多还原

【Abstract】 Three rectangular fins with changed geometry are proposed in this paper.A comparative experiment was carried out in which the air flows through the out_surface of a single row of finned tubes in a drawing wind tunnel and six versions were performed with cut side facing the wind or opposite to the wind and the results are compared with a plain finned tube.Some useful results are obtained.The experiment results show that in the range of wind velocity flowing the narrowest area,3 m/s≤Umax≤9 m/s,when the cut side of type b finned tube facing the wind,the average heat transfer coefficient is by 13.4% higher than the plain finned tube and when opposite to the wind it is by 11% higher.Type b fin has optimal geometry shape among the three fin types.This fin type has advantage of high heat transfer performance and is worth further researching.更多还原