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针对火电机组空冷凝汽器典型扁平管结构上蛇形翅片长度大,空气在翅片间流动对强化传热的效果受到边界层发展抑制的缺陷,根据锯齿翅片破坏边界层发展强化传热的思想,引入间断翅片结构强化火电空冷凝汽器扁平管空气侧传热.将原有蛇形翅片断开为不连续的蛇形短翅片,分别采用顺排、叉排方式将短翅片布置于扁平管管壁上.通过数值模拟,对短翅片的不同布置方式(顺排、叉排)、短翅片排数,以及不同断开间距下,间断蛇形短翅片间空气的流动与传热性能进行研究.结果表明,与原有连续结构相比,在工程实际应用的空气流动速度范围内,采用间断短翅片结构可以有效提高空气侧的传热性能,且由于间断结构减小了空气与壁面的接触面积,流动的压力损失增加受到抑制.
In view of the large length of the serpentine fin on the typical flat tube structure of the air-cooled condenser of the thermal power unit, the effect of the flow of the air between the fins on the enhanced heat transfer is hindered by the development of the boundary layer. , The finned fin structure was introduced to strengthen the heat transfer on the air side of the flat tube of the thermal power condenser.The conventional serpentine fin was cut into discontinuous serpentine short fins, The film is arranged on the wall of the flat tube, and through the numerical simulation, the arrangement of the short fins (the row and the row, the row of short ribs), the row number of the short fins and the gap between the short and the short fins The results show that, compared with the original continuous structure, the discontinuous short fin structure can effectively improve the heat transfer performance of the air side in the practical application of air flow velocity, and due to the discontinuity The structure reduces the air-to-wall contact area and the increase in flow pressure loss is suppressed.