采用数值模拟方法对百叶窗翅片管换热器空气侧传热和流动特性进行研究，分析管排数、开窗角度和翅片间距对百叶窗翅片管换热器空气侧性能的影响。结果表明：空气侧传热系数随管排数增多而降低，最大降幅约12.5%，压降随管排数增多而增大；低雷诺数下百叶窗角度为20°时换热器具有较好的综合性能，较大雷诺数下25°为最佳百叶窗角度；随着翅片间距的减小，换热器传热因子j和阻力因子f均逐渐增大，但低雷诺数时翅片间距较小的换热器综合性能较差。

The air side heat transfer and flow characteristics of the louvered finandtube heat exchanger were investigated by CFD simulation.The effects of the tube rows number,louver angle and fin pitch on the heat transfer and flow characteristics of the louvered finandtube heat exchanger were analyzed by a series of numerical simulations.The results show found that the air side heat transfer coefficient of the louvered finandtube heat exchanger decreased with the increase of tube rows number,with a maximum decrease of about 12.5%.Besides,the pressure drop increased with the number of tube rows.With the louver angle of 20°,the heat exchanger showed better comprehensive performance at low Reynolds number.While at high Reynolds number,it showed better comprehensive performance with the louver angle of 25°.As the fin pitch decreased,the Colburn j factor and the resistance factor f of the heat exchanger increased gradually.However,the comprehensive performance of heat exchanger with smaller fin pitch was poor at low Reynolds number.

TK172