摘要
蒸发器换热管间制冷剂的分配不均会导致其制冷能力的下降。建立了管壳式蒸发器和分流板三维模型,模拟研究了分流板的位置、开孔大小、开孔数量和开孔结构对R410A均分性能的影响。模拟结果表明,分流板各参数对制冷剂均流效果有显著影响。在不同入口流速工况下,不均匀度随分流板向蒸发器入口端的移动而下降且降幅逐渐变缓;不均匀度随开孔直径的增大而上升,随开孔数量的增大而下降并达到稳定;经优化分流板开孔结构,上下小孔结构的均分性能相比等圆孔结构可提高21.4%。搭建了蒸发器流量分配实验台,通过实验验证了模拟得出的流量分配规律以及分流板对流体均分性能的提升,说明根据流量分布特点优化分流板开孔结构能有效提升制冷剂的均流效果。
The uneven distribution of refrigerant between the heat exchange tubes of the evaporator will result in a decrease in its refrigeration capacity.Three-dimensional models of shell and tube evaporator and splitter plates were established.The effects of splitter plate position,aperture,number and opening structure on R410A flow distribution performance were simulated.The results show that the parameters of splitter plate have a significant effect on uniform distribution of refrigerant.Under different inlet flow rate conditions,the unevenness declined with the movement of splitter plate to the inlet of evaporator,and the decrease rate gradually slowed down.The unevenness increases with the diameter of aperture,decreases with the number of opening and reaches stability.After optimizing the opening structure of the splitter plate,the average performance of the upper and lower smallhole can be increased by 21.4%compared with the equal round hole structure.The evaporator flow distribution experimental platform was built.The flow distribution law obtained from simulation and the improvement of flow evenness performance with splitter plate were verified by experiments.Which illustrate that optimizing the opening structure of splitter plate according to characteristics of flow distribution can effectively improve the effect of refrigerant evenness.
作者
宋哲
许波
陈振乾
SONG Zhe;XU Bo;CHEN Zhenqian(School of Energy and Environment,Southeast University,Nanjing 210096,Jiangsu,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2021年第9期4629-4638,共10页
CIESC Journal
关键词
流动
数值模拟
实验验证
不均匀度
分流板
flow
numerical simulation
experimental validation
unevenness
splitter plate
