摘要
提高液态铅铋合金(LBE)与超临界二氧化碳(S-CO_(2))之间的换热效率对于推动先进核能系统的发展具有重要意义。通过数值模拟方法,研究了直型、翼型、S型、Z型4种几何模型流道结构印刷电路板式换热器(printed circuit heat exchanger,PCHE)的换热性能。结果表明,换热器冷侧热阻明显高于热侧热阻,直通道PCHE的热侧传热系数平均为冷侧的26.2倍。在固定热侧流道结构的条件下,重点探讨了不同冷侧流道结构对PCHE换热性能的影响。结果表明,与直型流道相比,Z型流道、S型流道和翼型流道的换热量分别提高了23.3%、22.2%和10.6%,等泵功指标分别提高了1.48倍、1.68倍和1.44倍。此外,对比了当冷侧流量提升20%时不同PCHE的动态性能,其中直通道的重新平衡时间最短,相比换热量的提升,流体压降损失更显著。研究结果为优化LBE/S-CO_(2)换热器设计提供了理论依据,并对提高下一代核能系统的热效率具有指导意义。
Improving the heat transfer efficiency between liquid lead-bismuth eutectic(LBE)and supercritical carbon dioxide(S-CO_(2))is of great significance for advancing the development of advanced nuclear energy systems.The heat transfer performance of printed circuit heat exchangers(PCHE)with different channel structures(straight shaped,wing-shaped,S-shaped and Z-shaped)is investigated through numerical simulation.The results show that the thermal resistance on cold side of the heat exchanger is significantly higher than that on the hot side,with the average heat transfer coefficient of the hot side in straight-channel PCHE being 26.2 times that of the cold side.Under the condition of a fixed hot-side channel structure,the effects of different cold-side channel structures on PCHE heat transfer performance are explored.The results indicate that,compared with straight channels,the heat transfer of Z-shaped,S-shaped and wing-shaped channels increases by 23.3%,22.2%,and 10.6%,respectively,while the specific pumping power improves by 1.48 times,1.68 times,and 1.44 times,respectively.In addition,the dynamic performance of different PCHE designs when the cold-side flow rate increases by 20%is compared,revealing that the straight-channel PCHE has the shortest rebalancing time.The pressure drop loss is more significant than the improvement in heat transfer.These findings provide theoretical guidance for optimizing the design of LBE/S-CO_(2) heat exchangers and contribute to enhancing the thermalefficiency of next-generation nuclear energy systems.
作者
倪依柯
李红智
杨玉
张一帆
吴帅帅
韩煜航
吴家荣
NI Yike;LI Hongzhi;YANG Yu;ZHANG Yifan;WU Shuaishuai;HAN Yuhang;WU Jiarong(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China)
出处
《热力发电》
北大核心
2025年第7期135-143,共9页
Thermal Power Generation
基金
陕西省创新能力支撑计划项目(2023-CX-TD-18)。
