朱兵国,巩楷刚,孙健,彭斌,朱鑫杰
ZHU Bingguo,GONG Kaigang,SUN Jian,PENG Bin,ZHU Xinjie

• 1:兰州理工大学机电工程学院
• 2:华北电力大学低品位能源多相流与传热北京市重点实验室

摘要(Abstract)：

针对超高参数CO_2在大直径管中传热性能数据缺乏等问题，采用数值模拟的方法对超高参数CO_2在30 mm管中的传热特性进行了研究，并通过在均匀加热条件下开展CO_2在竖直管内的传热实验研究对其准确性进行了验证。结果表明，超临界压力CO_2在不同温区的传热特性表现出巨大差异，当入口温度低于拟临界温度T_(pc)，在T_(pc)前壁温出现了峰值现象，传热发生了恶化，而当入口温度大于T_(pc)，壁温沿着主流方向单调上升；热流密度和压力对最小传热系数h_(min)的影响较小，质量流速G对h_(min)影响较为明显，质量流速增大1.5倍时，传热系数增大约1.4倍；基于数值模拟结果本文给出了超高参数工况下临界热流密度的判据。研究结果将对超临界CO_2发电系统受热面的设计与安全运行提供理论指导。
In view of the lack of heat transfer performance data of ultrahigh parameter CO_2 in large diameter tube，the heat transfer characteristics of ultrahigh parameter CO_2 in 30 mm tube were studied by numerical simulation，the accuracy was verified by the experimental study of CO_2 heat transfer in a vertical tube under uniform heating.The results show that the heat transfer characteristics of supercritical pressure CO_2 in different temperature zones show great differences.When the inlet temperature is lower than the pseudo-critical temperature T_(pc)，wall temperature peak phenomenon occurs and the heat transfer deteriorates before T_(pc).When the inlet temperature is greater than T_(pc)，the wall temperature rises monotonously along the main flow direction.The heat flux and pressure have little influence on the h_(min).However，the mass flux G has obvious influence on hmin.When G increases by 1.5 times，the heat transfer coefficient increases by 1.4 times.Finally，based on the numerical simulation results，the criterion of the critical heat flux under ultra-high parameter conditions was given.The research results provide theoretical guidance for the design and safe operation of the heated wall on the supercritical CO_2 power generation system.

关键词(KeyWords)： 超临界CO_2;超高参数;传热;试验;数值模拟
supercritical CO_2;ultrahigh parameter;heat transfer;experiment;numerical simulation

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51966009,51675254);; 国家重点研发计划“科技助力2020”重点专项(SQ2020YFF0420989);; 兰州市人才创新创业项目(2020RC-23)

作者(Author): 朱兵国,巩楷刚,孙健,彭斌,朱鑫杰
ZHU Bingguo,GONG Kaigang,SUN Jian,PENG Bin,ZHU Xinjie

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