超临界CO_2微通道平行流气冷器流量分配优化研究  

Research of Flow Distribution Optimization of Micro-Channel Parallel CO_2 Gas Cooler

作　　者：杨凤叶 刘敏珊 刘彤 王永庆 

机构地区：[1]河南省过程传热与节能重点实验室,河南郑州450002

出　　处：《压力容器》2013年第8期33-37,共5页Pressure Vessel Technology

基　　金：国家自然科学基金资助项目(51076145)

摘　　要：采用FLUENT软件对微通道平行流气冷器流量分配特性进行模拟,通过改变换热器的进口扁管与集流管的组合尺寸T和扁管的长度L,对每根扁管流量分配不均匀度的大小,做出相应的火积耗散分析,由火积耗散的大小,可以得出气冷器流量分配不均匀度对换热的影响。结果表明,上述参数的改变对平行流气冷器内部扁管的流量分配不均匀度和火积耗散有较大的影响,二者在T=0.5时均达到最小,且随着扁管长度的增加而减小,但减小幅度逐渐变小。研究结果为考察平行流气冷器流量分配不均匀度对换热的影响提供参考依据,同时也为优化、评价换热器性能,提出一种新的途径。The flow distribution performance of parallel micro - channel gas cooler is studied by FLUENT software,the transfer entransy correspond to each flat tube flow maldistribution is analyzed by changing the depth between flat tube imports and manifold and the length of flat tube, also the effect of heat transfer can be drawn by the entransy dissipation. The results show that the flow maldistribution and entransy dis- sipation of the parallel gas - cooler internal flat tube has a greater impact through changing the above pa- rameters. The flow distribution and entransy dissipation are smaller when T = 0.5, and decreases with the increase of the length of the flat tubes. However, the reduced amplitude becomes gradually smaller. The results of this article provide a reference for the impact of the heat exchanger by flow maldistribution and also give a new way to optimize the evaluation of heat exchanger performance.

关 键 词：平行流气冷器 流量分配不均匀度 火积耗散 

分 类 号：TH122[机械工程—机械设计及理论] TB657[一般工业技术—制冷工程]