Improvements on maldistribution of a high temperature multi-channel compact heat exchanger by different inlet baffles
Improvements on maldistribution of a high temperature multi-channel compact heat exchanger by different inlet baffles
复制标题
不同入口挡板对高温多通道紧凑型换热器分布不均的改进
DOI：
10.1016/j.energy.2014.05.021
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发表时间：
2014-10
期刊：
影响因子：
9
通讯作者：
Q. W. Wang
中科院分区：
文献类型：
--
作者：
W. X. Chu;T. Ma;M. Zeng;T. Qu;L. B. Wang;Q. W. Wang
建议在高效动力和推进系统中采用多通道板式换热器。采用计算流体动力学(CFD)方法对高温换热器进口歧管结构处的大流量不均匀现象进行了分析。提出了四种改进的进气歧管，包括斜折流板、节段式导流板、螺旋导流板和改进的螺旋导流板。结果表明，所有设计方案都或多或少地改善了各流道之间的流量均匀分布。通过对进气歧管的流动不均匀性、Nusselt数和摩擦因数的比较，发现等差螺旋隔板的进气歧管效果最好，其流动不均匀性平均可降低52%。同时，与基线设计相比，引入螺旋流的最优改进设计对其综合性能有一定的影响。当压降在可接受的范围内时，由于产生的螺旋流体流动，努塞尔数平均可提高24%。此外，根据CFD结果得到了Nuw和Fare的对应关联式。
The multi-channels plate heat exchangers are recommended to be used in the high-efficiency power and propulsion systems. The present study analyzes the large fluid flow maldistribution occurring at the inlet manifold configurations of a high temperature heat exchanger with CFD (computational fluid dynamics) method. Four modified inlet manifolds are proposed, including inclined baffle, segmental baffle, helical baffle and improved helical baffle. It turns out that all the proposed designs have more or less improvement of uniform flow distribution among each channel. By comparing the flow nonuniformity, the Nusselt number and the friction factor, the inlet manifold with equidifferent helical baffles is the best, whose flow nonuniformity can be decreased by 52% averagely. Comparing with the baseline design, meanwhile, the optimal modified design which inducts the spiral fluid flow has effect on the comprehensive performance. The Nusselt number can be increased by 24% averagely due to the produced spiral fluid flow while the pressure drop is in an acceptable range. Furthermore, the corresponding correlation ofNuandfare obtained according to CFD results.
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