扁管空冷器翅片结构优化研究

摘要

基于带翅片的扁管空冷器的传热过程，对带翅片的扁管建立模型，并利用该模型在不同的翅片长度及不同风速下进行数值模拟，分析了翅片长度的选择与迎面风速的关系。分析结果表明，当翅片长度增加到一定值后，通过增加翅片长度的手段来强化换热性能收效很小；在低迎面风速下，翅片长度不要过长；在高迎面风速下，仍存在较大的传热温差，空气出口温度的增加只能通过增加翅片长度来完成。%The relationship between the length of the fin and the windward velocity is analyzed , the model of the flat tube with fins is established and a numeric simulation study is made under the condition of different fin lengths and different wind speeds according to the heat transfer of theair -cooler with finned flat-tubes.Results show that, to strengthen heat transfer perform-ance by increasing the fin length can only lead to alittle benefit when the fin length increases to a certain value.The fin length shouldn′t be too long under lower wind speed.Under higher windspeed , there is still a heat ransfer temperature difference, however , the outlet air temperature rises only by increasing the finlength .