An Experimental Study on Flow Instability of Carbon Dioxide Between Two Parallel Vertical Upward Channels

被引：0
作者：
Deng Y. [1 ]
Lei X. [1 ]
Liu Q. [1 ]
Liu S. [1 ]
Wu P. [2 ]
机构：
[1] State Key Laboratory of Multiphase Flow in Power Engineering (Xi’an Jiaotong University), Shaanxi Province, Xi’an
[2] School of Nuclear Science and Technology, Xi’an Jiaotong University, Shaanxi Province, Xi’an
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2024年 / 44卷 / 07期
基金：
中国国家自然科学基金;
关键词：
carbon dioxide; flow instability; parallel channels; threshold heat flux;
D O I：
10.13334/j.0258-8013.pcsee.222399
中图分类号：
学科分类号：
摘要：
Due to its compactness, high efficiency and flexibility, the potential applications of advanced supercritical carbon dioxide (S-CO2) Brayton cycle in Generation III of Solar-thermal systems and Generation IV nuclear reactors are fantastic. The flow instability in the Brayton cycle system threatens the safe operation of the unit. To study the flow instability of CO2 in parallel vertical upward channels, an experimental system is established, and the effect of operational parameters on the flow instability is obtained. A prediction model on CO2 flow instability is established by introducing a dimensionless throttling coefficient. The predicted value is in good agreement with the experimental value (+20%). It is found that increasing the system pressure and the mass flow, and reducing the subcooling (∆Tsub-5~20 ℃) can increase the flow stability between parallel tubes. With the increase of outlet throttling, the flow stability between parallel tubes decreases, and the stability boundary of heat load gradually decreases. ©2024 Chin.Soc.for Elec.Eng.
引用
收藏
页码：2726 / 2736
页数：10
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