并联竖直上升通道内二氧化碳流动不稳定性实验研究  

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

作　　者：邓越文 雷贤良[1] 刘清江 刘书涵 吴攀 DENG Yuewen;LEI Xianiang;LIU Qingjiang;LIU Shuhan;WU Pan(State Key Laboratory of Multiphase Flow in Power Engineering(Xi’an Jiaotong University),Xi’an 710049,Shaanxi Province,China;School of Nuclear Science and Technology,Xi’an Jiaotong University,Xi’an 710049,Shaanxi Province,China)

机构地区：[1]动力工程多相流国家重点实验室(西安交通大学),陕西省西安市710049 [2]西安交通大学核科学与技术学院,陕西省西安市710049

出　　处：《中国电机工程学报》2024年第7期2726-2736,I0018,共12页Proceedings of the CSEE

基　　金：国家自然科学基金项目(U1867218,U20B200381);中国华能集团有限公司能源安全技术专项(HNKJ20-H87-04)。

摘　　要：先进超临界二氧化碳(supercritical carbon dioxide,S-CO_(2))布雷顿循环系统因具有紧凑、高效灵活的特点,在第三代光热系统和第四代核电系统中具有良好的应用前景,而布雷顿循环系统中的流动不稳定性威胁着机组的安全运行。为研究竖直上升并联管内CO_(2)的流动不稳定性,该文建立CO_(2)流动不稳定性系统进行实验研究,获得热工参数对流动不稳定性的影响规律;引入无量纲节流系数,构建CO_(2)流动不稳定性预测模型;模型预测效果良好,预测值与实验值吻合良好(误差±20%)。研究发现,增加系统压力、增加质量流量及过冷度范围在5~20℃时,减小过冷度均有利于提高并联管间流动的稳定性;随着出口节流增加,并联管间流动稳定性降低,且发生不稳定性的界限热负荷逐渐减小。Due to its compactness,high efficiency and flexibility,the potential applications of advanced supercritical carbon dioxide(S-CO_(2))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 CO_(2) 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 CO_(2) 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(ΔT_(sub)=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.

关 键 词：二氧化碳 流动不稳定性 并联管 界限热负荷 

分 类 号：TK124[动力工程及工程热物理—工程热物理]