通过数值模拟的方法,以二元共晶盐MgCl2-KCl和sCO2作为换热工质,探究熔盐和sCO2印刷电路板换热器（PCHE）流道的热工水力规律。在翼型通道内,由于流动工质在翅片端部发生碰撞,流速最小值一般出现在翅片端部。受流速影响,压力最小值通常出现在翅片最厚处。直通道和翼型通道内Nu、Δp均随Re的增大而增大,f随Re的增大而减小。在直通道和翼型通道内传热效果分别提升53.3%和56.9%。通过拟合,建立熔盐和sCO2作为工质在印刷电路板换热器中的传热和摩擦关联式。
Abstract
This article uses numerical simulation methods to investigate the thermal hydraulic laws of the flow channels in a molten salt and sCO2 printed circuit board heat exchanger （PCHE） using binary eutectic salts MgCl2-KCl and sCO2 as heat transfer media. In the airfoil channel, due to the collision of the flowing working fluid at the end of the fins, the minimum flow velocity generally occurs at the end of the fins. Due to the influence of flow velocity, the minimum pressure usually occurs at the thickest part of the fins. Nu and Δp in both straight and wing channels increase with the increase of Re, while f decreases with the increase of Re. The heat transfer efficiency in the straight channel and wing channel has been improved by 53.3% and 56.9%, respectively. By fitting, a heat transfer and friction correlation equation was established for molten salt and sCO2 as working fluids in printed circuit board heat exchangers.
关键词
太阳能热发电 /
熔盐 /
sCO2 /
印刷电路板换热器 /
翼型通道 /
直通道
Key words
numerical simulation /
molten salt /
sCO2 /
printed circuit board heat exchanger /
airfoil channel /
straight channel
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基金
国家自然科学基金（52076006）; 国家重点研发计划（2022YFB4202402）
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