CIESC Journal ›› 2024, Vol. 75 ›› Issue (S1): 108-117.DOI: 10.11949/0438-1157.20240887

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

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

Guanyu REN(), Yifei ZHANG, Xinze LI, Wenjing DU()   

  1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2024-08-03 Revised:2024-09-05 Online:2024-12-17 Published:2024-12-25
  • Contact: Wenjing DU

翼型印刷电路板式换热器流动传热特性数值研究

任冠宇(), 张义飞, 李新泽, 杜文静()   

  1. 山东大学能源与动力工程学院,山东 济南 250061

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: