丁胞与翼形肋片相结合的印刷电路板式换热器流动与换热特性的研究
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摘要
本文针对太阳能热电站中超临界二氧化碳(S-CO_2)布雷顿动力循环的关键换热设备,提出了一种基于丁胞强化技术的新型非连续翼型肋片印刷电路板式换热器(PCHE)。首先,构建并验证了PCHE典型流道的三维流动换热数值计算模型,研究了丁胞数量和布置方式对流动与换热特性的影响规律,并获得了该新型PCHE的最佳几何结构;然后,对比分析了最佳结构与无丁胞原始结构的综合性能。结果表明,当单元体积内丁胞数量为2个且丁胞与肋片错列布置时,该新型PCHE的综合性能最佳;在所研究的雷诺数范围内,相比于无丁胞的非连续翼型肋片PCHE,新型PCHE的综合性能可提升3.5%～8.7%。可见,本文提出的新型PCHE结构可有效提高S-CO_2换热器综合性能,并可为太阳能热电站中S-CO_2换热设备的开发与应用提供参考。
In present paper, a novel airfoil printed circuit heat exchanger(PCHE) with dimples was proposed as heat exchanger for supercritical carbon dioxide(S-CO_2) Brayton cycles in the concentrated solar power plant. Firstly, a three-dimensional flow and heat transfer numerical model was developed and validated. Then, the number and arrangement of dimples were optimized, and an optimized airfoil PCHE with dimples was obtained and compared with airfoil PCHE without dimples.The results indicated that airfoil PCHE with dimples achieved the best comprehensive performance when a unit volume had two dimples which were in staggered arrangement with airfoil fins. In the range of Reynolds number studied, the comprehensive performance can be improved by 3.58.7% after replacing the original PCHE by the novel. The above results indicate that the proposed PCHE can achieve good performance in the heat transfer of S-CO_2, and can be used in solar power plant.
In present paper, a novel airfoil printed circuit heat exchanger(PCHE) with dimples was proposed as heat exchanger for supercritical carbon dioxide(S-CO_2) Brayton cycles in the concentrated solar power plant. Firstly, a three-dimensional flow and heat transfer numerical model was developed and validated. Then, the number and arrangement of dimples were optimized, and an optimized airfoil PCHE with dimples was obtained and compared with airfoil PCHE without dimples.The results indicated that airfoil PCHE with dimples achieved the best comprehensive performance when a unit volume had two dimples which were in staggered arrangement with airfoil fins. In the range of Reynolds number studied, the comprehensive performance can be improved by 3.58.7% after replacing the original PCHE by the novel. The above results indicate that the proposed PCHE can achieve good performance in the heat transfer of S-CO_2, and can be used in solar power plant.
引文
[1] HE Yaling, WANG Kun, QIU Yu, et al. Review of the Solar Flux Distribution in Concentrated Solar Power:NonUniform Features, Challenges, and Solutions[J]. Applied Thermal Engineering, 2019, 149:448-474
[2] Bartel N, CHEN Minghui, Utgikar V P, et al. Comparative Analysis of Compact Heat Exchangers for Application as the Intermediate Heat Exchanger for Advanced Nuclear Reactors[J]. Annals of Nuclear Energy, 2015, 81:143-149
[3] Yoon S J, O'Brien J, CHEN Minghui, et al. Development and Validation of Nusselt Number and Friction Factor Correlations for Laminar Flow in Semi-circular Zigzag Channel of Printed Circuit Heat Exchanger[J]. Applied Thermal Engineering, 2017, 123:1327-1344
[4] CHEN Fei, ZHANG Lishen, HUAI Xiulan, et al. Comprehensive Performance Comparison of Airfoil Fin PCHEs with NACA 00XX Series Airfoil[J]. Nuclear Engineering&Design, 2017, 315:42-50
[5]李瑞,何雅玲,楚攀,等.丁胞型强化换热管的数值模拟[J].工程热物理学报,2008, 29(11):1947-1949LI Rui, HE Yaling, CHU Pan, et al. Numerical Simulation of Dimpled Tubes for Heat Transfer Enhancement[J]. Journal of Engineering Thermophysics, 2008, 29(11):1947-1949
[6] XU Xiangyang, MA Ting, LI Lei, et al. Optimization of Fin Arrangement and Channel Configuration in an Airfoil Fin PCHE for Supercritical CO_2 Cycle[J]. Applied Thermal Engineering, 2014, 70(1):867-875
[2] Bartel N, CHEN Minghui, Utgikar V P, et al. Comparative Analysis of Compact Heat Exchangers for Application as the Intermediate Heat Exchanger for Advanced Nuclear Reactors[J]. Annals of Nuclear Energy, 2015, 81:143-149
[3] Yoon S J, O'Brien J, CHEN Minghui, et al. Development and Validation of Nusselt Number and Friction Factor Correlations for Laminar Flow in Semi-circular Zigzag Channel of Printed Circuit Heat Exchanger[J]. Applied Thermal Engineering, 2017, 123:1327-1344
[4] CHEN Fei, ZHANG Lishen, HUAI Xiulan, et al. Comprehensive Performance Comparison of Airfoil Fin PCHEs with NACA 00XX Series Airfoil[J]. Nuclear Engineering&Design, 2017, 315:42-50
[5]李瑞,何雅玲,楚攀,等.丁胞型强化换热管的数值模拟[J].工程热物理学报,2008, 29(11):1947-1949LI Rui, HE Yaling, CHU Pan, et al. Numerical Simulation of Dimpled Tubes for Heat Transfer Enhancement[J]. Journal of Engineering Thermophysics, 2008, 29(11):1947-1949
[6] XU Xiangyang, MA Ting, LI Lei, et al. Optimization of Fin Arrangement and Channel Configuration in an Airfoil Fin PCHE for Supercritical CO_2 Cycle[J]. Applied Thermal Engineering, 2014, 70(1):867-875