微通道换热器内分流板流量分配特性  

Flow Distribution Characteristics of Deflector in Micro Channel Heat Exchanger

作　　者：刘巍[1] 朱春玲[1] 

机构地区：[1]南京航空航天大学航空宇航学院,南京210016

出　　处：《农业机械学报》2012年第12期257-261,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(10972106)

摘　　要：以水为工质,以微通道平行流蒸发器为模型,试验研究了1孔、5孔、12孔3种不同结构分流板的流量分配特性,并与无分流板时作了比较。结果表明:集流管的入口雷诺数小于3 000时,无分流板和1孔分流板的流量分配受雷诺数的影响很大,均匀性和稳定性均较差,但无分流板时的均匀性好于1孔分流板,当入口雷诺数大于3 000时,无分流板时的均匀性最差,1孔分流板的均匀性和稳定性变好;在入口雷诺数小于4 000时,5孔分流板的流量分配均匀性和稳定性均较好,当雷诺数大于4 000时,均匀性和稳定性变差;12孔分流板的流量分配均匀性和稳定性始终最好,均匀性随着雷诺数增大而略有提高。Four different test samples （no deflector, deflector with one hole, deflector with five holes, and deflector with twelve holes in the manifold ） of micro-channel evaporator with parallel flow were processed. Flow distribution characteristics of deflectors were experimentally studied with water as the working fluid. The results showed that when the entrance Reynolds number was less than 3 000, the influence of which on the flow distribution characteristics of both the samples without deflector and with the deflector with one hole was apparent, and the flow distribution uniformity and stability of the two test samples were poor, but the sample without deflector was better than the deflector with one hole. After the entrance Reynolds number was more than 3 000, the uniformity and stability of the deflector with one hole was becoming better, but the uniformity of the sample without deflector was the worst in four of the test samples. The deflector with five holes had the good and stable flow distribution uniformity when the Reynolds number was less than 4 000. As the Reynolds number was more than 4 000, the flow distribution uniformity was worse. In comparison, the flow distribution uniformity and stability of the deflector with twelve holes were always the best in all the test samples, and as the entrance Reynolds number increased, the uniformity of flow distribution was improved slightly.

关 键 词：微通道换热器 分流板 流量分配 试验 

分 类 号：TK124[动力工程及工程热物理—工程热物理]