Numerical study on flow and heat transfer characteristics of airfoil printed circuit heat exchangers

doi:10.11949/0438-1157.20240887

Abstract

Abstract:

Printed circuit heat exchanger (PCHE), as a new type of efficient and compact micro-channel heat exchanger, has been widely used in supercritical carbon dioxide (SCO₂) Brayton cycle. The thermal and hydraulic performance of SCO₂ in airfoil PCHE channel was analyzed by numerical simulation. With the improvement of fin size, the surface heat transfer coefficient and comprehensive performance are improved, and with the increase of variation degree, the surface heat transfer coefficient and comprehensive performance are further improved. When the Angle of attack is changed to change the fin orientation, the surface heat transfer coefficient and comprehensive performance are higher than that when the angle of attack is 0°, and the surface heat transfer coefficient and comprehensive performance are further improved with the increase of change degree. Slotting in the center of the fin to change the shape of the fin, slotted fin arrangement can reduce the friction factor, improve the flow performance, but the comprehensive performance is reduced. The orthogonal test with the three structural parameters of fin size, orientation and shape shows that the dimensionless slot width of fin has the greatest influence on the flow heat transfer performance. In the sample range, the structure with fin expansion ratio of 1.4, angle of attack of 20° and no slot has the best comprehensive performance. The analysis of flow and heat transfer performance of PCHE with different airfoil structures can provide reference for SCO₂ cooling theory research and PCHE typical engineering application.

Key words: supercritical carbon dioxide, printed circuit heat exchanger, numerical simulation, flow, heat transfer

摘要：

印刷电路板式换热器（PCHE）作为一种新型微通道换热器，在超临界二氧化碳（SCO₂）布雷顿循环中广泛应用。通过数值模拟分析了SCO₂在翼型PCHE通道中的热工水力性能。结果表明，改进翅片尺寸和迎角能提高表面传热系数与综合性能。随着相关参数变化程度增大，对应的表面传热系数与综合性能进一步提高。在翅片中心开槽能够降低摩擦因子，但综合性能下降。结合翅片尺寸、方位、形状的三个结构参数的正交试验表明，翅片无量纲开槽宽度对流动传热性能的影响最大。在样本范围内，翅片扩大倍数为1.4，迎角为20°且不开槽的结构综合性能最佳。不同结构的翼型PCHE流动传热性能的分析可为SCO₂冷却理论研究和PCHE典型工程应用提供参考和借鉴。

关键词: 超临界二氧化碳, 印刷电路板式换热器, 数值模拟, 流动, 传热

CLC Number:

TK 124

Guanyu REN, Yifei ZHANG, Xinze LI, Wenjing DU. Numerical study on flow and heat transfer characteristics of airfoil printed circuit heat exchangers[J]. CIESC Journal, 2024, 75(S1): 108-117.

任冠宇, 张义飞, 李新泽, 杜文静. 翼型印刷电路板式换热器流动传热特性数值研究[J]. 化工学报, 2024, 75(S1): 108-117.

Figures/Tables 12

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水平序号	翅片扩大倍数M	翅片迎角θ	翅片无量纲开槽宽度ζ
1	1	0	0
2	1.1	5	0.02
3	1.2	10	0.04
4	1.3	15	0.06
5	1.4	20	0.08

水平序号	翅片扩大倍数M	翅片迎角θ	翅片无量纲开槽宽度ζ
1	1	0	0
2	1.1	5	0.02
3	1.2	10	0.04
4	1.3	15	0.06
5	1.4	20	0.08

Case	M	θ/(°)	ζ	H/(kW/(m²·K))	f×10³	PEC
M₁θ₁ζ₁	1	0	0	5.66	8.79	1.000
M₁θ₂ζ₃	1	5	0.04	5.61	8.74	0.978
M₁θ₃ζ₅	1	10	0.08	5.67	9.29	0.966
M₁θ₄ζ₂	1	15	0.02	5.86	9.22	0.989
M₁θ₅ζ₄	1	20	0.06	6.19	10.63	1.000
M₂θ₁ζ₅	1.1	0	0.08	5.51	8.57	0.971
M₂θ₂ζ₂	1.1	5	0.02	5.76	8.71	1.001
M₂θ₃ζ₄	1.1	10	0.06	5.87	9.48	0.985
M₂θ₄ζ₁	1.1	15	0	6.26	9.76	1.040
M₂θ₅ζ₃	1.1	20	0.04	6.08	10.26	0.994
M₃θ₁ζ₄	1.2	0	0.06	5.69	8.70	0.987
M₃θ₂ζ₁	1.2	5	0	6.03	8.65	1.065
M₃θ₃ζ₃	1.2	10	0.04	6.12	9.50	1.016
M₃θ₄ζ₅	1.2	15	0.08	6.18	10.61	0.992
M₃θ₅ζ₂	1.2	20	0.02	5.91	10.05	0.995
M₄θ₁ζ₃	1.3	0	0.04	5.97	8.92	1.016
M₄θ₂ζ₅	1.3	5	0.08	5.72	8.89	0.985
M₄θ₃ζ₂	1.3	10	0.02	5.89	9.25	1.008
M₄θ₄ζ₄	1.3	15	0.06	6.13	10.78	0.992
M₄θ₅ζ₁	1.3	20	0	6.73	11.03	1.113
M₅θ₁ζ₂	1.4	0	0.02	5.99	9.22	1.030
M₅θ₂ζ₄	1.4	5	0.06	6.00	9.01	1.015
M₅θ₃ζ₁	1.4	10	0	6.48	9.66	1.090
M₅θ₄ζ₃	1.4	15	0.04	6.56	10.99	1.037
M₅θ₅ζ₅	1.4	20	0.08	6.58	11.31	1.035

Case	M	θ/(°)	ζ	H/(kW/(m²·K))	f×10³	PEC
M₁θ₁ζ₁	1	0	0	5.66	8.79	1.000
M₁θ₂ζ₃	1	5	0.04	5.61	8.74	0.978
M₁θ₃ζ₅	1	10	0.08	5.67	9.29	0.966
M₁θ₄ζ₂	1	15	0.02	5.86	9.22	0.989
M₁θ₅ζ₄	1	20	0.06	6.19	10.63	1.000
M₂θ₁ζ₅	1.1	0	0.08	5.51	8.57	0.971
M₂θ₂ζ₂	1.1	5	0.02	5.76	8.71	1.001
M₂θ₃ζ₄	1.1	10	0.06	5.87	9.48	0.985
M₂θ₄ζ₁	1.1	15	0	6.26	9.76	1.040
M₂θ₅ζ₃	1.1	20	0.04	6.08	10.26	0.994
M₃θ₁ζ₄	1.2	0	0.06	5.69	8.70	0.987
M₃θ₂ζ₁	1.2	5	0	6.03	8.65	1.065
M₃θ₃ζ₃	1.2	10	0.04	6.12	9.50	1.016
M₃θ₄ζ₅	1.2	15	0.08	6.18	10.61	0.992
M₃θ₅ζ₂	1.2	20	0.02	5.91	10.05	0.995
M₄θ₁ζ₃	1.3	0	0.04	5.97	8.92	1.016
M₄θ₂ζ₅	1.3	5	0.08	5.72	8.89	0.985
M₄θ₃ζ₂	1.3	10	0.02	5.89	9.25	1.008
M₄θ₄ζ₄	1.3	15	0.06	6.13	10.78	0.992
M₄θ₅ζ₁	1.3	20	0	6.73	11.03	1.113
M₅θ₁ζ₂	1.4	0	0.02	5.99	9.22	1.030
M₅θ₂ζ₄	1.4	5	0.06	6.00	9.01	1.015
M₅θ₃ζ₁	1.4	10	0	6.48	9.66	1.090
M₅θ₄ζ₃	1.4	15	0.04	6.56	10.99	1.037
M₅θ₅ζ₅	1.4	20	0.08	6.58	11.31	1.035

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