Effect of airfoil structure on flow and heat transfer characteristics of printed circuit heat exchanger

doi:10.19799/j.cnki.2095-4239.2023.0636

Abstract

Abstract:

The performance of the printed circuit heat exchanger (PCHE), an important component in the supercritical carbon dioxide (S-CO₂) Brayton cycle, affects the efficiency of the system. This study aims to improve the performance of airfoil PCHE by investigating the effect of the airfoil-fin structure on its flow and heat transfer performance. Herein, for the high-temperature return heaters in the S-CO₂Brayton cycle system, a numerical simulation method is used, with S-CO₂ selected as the heat transfer medium. By comparing the flow and heat transfer performance of the airfoil-fin channels of NACA0020 with three different structures, we study the influence of the positional parameter of the maximum thickness of the airfoil fins on the chord length on the performance of the heat exchanger and analyze the rule of change in terms of the thermo-hydraulic performance, comprehensive indexes, overall fluidity, local performance, etc. Results show that the heat transfer performance increases as the maximum thickness of the airfoil fins approaches the leading edge of the airfoil along the chord length while maintaining a constant relative thickness in the airfoil-fin structure. Compared to the other two airfoil-fin channels, the airfoil-fin channel of NACA0020-20 exhibits a larger j factor and Nu of 2.7%—8.8% and 2.7%—8%, respectively, under the selected operating conditions. This airfoil-fin structure can effectively reduce the influence of the boundary layer and improve the heat transfer performance in the PCHE. Overall, its performance is even better than the other two airfoil fins. These results provide a certain basis for the structural design and performance optimization of the airfoil PCHE.

Key words: supercritical carbon dioxide, heat exchanger, airfoil fin, maximum thickness, flow and heat transfer

CLC Number:

TK519

Feng LI, Yuanwei LU, Yanquan WANG, Yancheng MA, Yuting WU. Effect of airfoil structure on flow and heat transfer characteristics of printed circuit heat exchanger[J]. Energy Storage Science and Technology, 2024, 13(2): 416-424.

Figures/Tables 15

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项目	NACA0020-20	NACA0020-30	NACA0020-40
相对厚度	20%	20%	20%
最大厚度在弦长上的位置	20%	30%	40%

项目	边界条件
上、下壁面	周期
左、右壁面	对称
流固耦合壁面	耦合
其他壁面	绝热
冷、热流体入口	质量流量进口
冷、热流体出口	压力出口

Case	入口温度/K	出口压力/MPa
1	431	8
2	481	8
3	381	10
4	381	12

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