利用矩阵风扇改善散热器冷热介质温差场协同性

Optimization of Temperature Difference Field Synergy of Radiator Based on Matrix Fan

摘要:

基于传统乘用车的冷却模块共设计了5种矩阵风扇，利用数值模拟技术分析矩阵型式不同以及冷却空气流量不均匀对散热器换热性能和场协同数的影响.结果表明：采用矩阵风扇能够增加散热器的冷热介质温差场协同数，散热器换热量和冷热介质温差场协同数存在显著的正相关性；当通过散热器的冷却空气流量分布不均匀时，散热器换热量明显下降，且随着转速比的增加，换热量的降幅逐渐减小；散热器芯体不同区域冷却空气流量的变化对散热器换热性能的影响权重不同，当低温区对应的冷却空气流量较大时，散热器换热量以及温差场协同数的降幅增加.

Abstract:

Based on the cooling module of a sedan, five different matrix fan configurations were designed, and a numerical analysis of the effect of the different configurations and the nonuniformity of cooling air mass flow on the heat rejection performance was processed. The results indicate that the matrix fan can increase the synergy number of the temperature difference between the cold and hot medium in radiator, with which the heat dissipation has a positive correlation. As the cooling air flow through the radiator becomes nonuniformity, the heat rejection of radiator decreases. And with the increase of rotational speed ratio, the decreasing amplitude gradually descends. Moreover, the changes of cooling air mass flow in the different regions have different weight factors on the heat rejection performance of radiator, i.e., when the cooling air mass flow in the low temperature region is bigger, correspondingly the decreasing amplitude of the heat dissipation and synergy number rises.