第44卷第6期
南京航空航天大学学报
2012年12月
Journal of Nanjing University of Aeronautics &.Astronautics
Dec.2012
内部结构对微通道平行流蒸发性能的影响
刘巍朱春玲
(南京航空航天大学航空宇航学院,南京,210016)
要:试验研究了不同风量下通道平行流蕊发器内郎结构的変化对其流动和传热性能的彩。结果表明:去除
出口前的分流板后,蒸发琴在实验风量下的制冷能カ比原落发器提高了9,59%~10.56%,而阻カ損失减小了
12.5%左右,其性能显著提高。在此基础上,继续增大两流程连接处的流通面积后,蕊发器内的压力降几争无变
化,但制冷能カ明虽浅小,落发性能下降。增大集流管内邙的流通面积时,由于流通面积的位工不,对
蒸发器性能的响也不同,在保证制冷剂流量分配均匀性不降低的前提下,增大流通衝积可以小发器内的流动阻
力,提高钠冷能力。
关键词:敬道蒸发器;分流板;流通面积
中图分类号:TK124
文献标识:A文章编号:1005-2615(2012)06-0893-05
Effects of Inner Structure on Performance of
Micro-channel Parallel Flow Type Evaporator
itnit?
g
(College of Aerospace Engineering, Nanjing University of Aeronautis&Astronautics, Nanjing, 210016, China
Abstract: In experimental air flow conditions, the effects of inner structure on the heat transfer and flow
characteristics of micro-channel parallel flow type evaporator are investigated. The results indicate when
the deflector in front of the evaporator outlet is removed, the cooling capacity in different air flow is i
creased by 9.59%10.6% than the original evaporator, and the resistance coefficient is reduced
about 12.5%, thus the evaporator performance is improved significantly in different conditions. While
the circulation area of the connections between the two flow processes is increased on the basis of the
above, there is no influence on the pressure drop of evaporator, but the cooling capacity is reduced sig
nificantly. So the evaporator performance is decreased. When increasing the inner circulation area of
manifold, the different position of the circulation area produces different impact on the refrigeration ca
pacity of the evaporator. In the condition of low distribution of refrigerant being not decreased, the in-
crease of circulation area can decrease the pressure drop and improve cooling capacity
Key words: micro-channel evaporator; deflector; circulation area
微通道平行流蒸发器体积小,重量轻,结构紧为流量分配不均会严重影响蒸发器的换热性能。与
凑,在汽车空调上有广泛的应用前景。制冷剂在平锅炉内水的流量分配?不同,进入平行流蒸发器内
行通道内并联流动,普遍认为各通道内的流量分配的制冷剂是气液两相流,由于制冷剂的物性较特
不均是影响平行流蒸发器性能的主要因素。文献殊,因此很难直接进行试验和观察。影响平行流蒸
[]运用数值方法对平行流蒸发器进行了研究,认发器流量分配的因素很多,前人通过间接的试验和
收稿日期:2011-12-09;修订日期:2012-06-06
通讯作者:朱春玲,女,教授博士生导师,1968年出生,E-mail:dazhu@nua.edu.cn。
万方数据