为了研究船用板式堆芯或矩形换热器的自然循环流动特性，建立单矩形通道自然循环流动特性实验装置，并进行一系列自然循环流动特性的实验研究和理论分析。结果表明，随着加热热流密度的增加，单矩形通道内自然循环的流动特性在单相区域、过冷沸腾区域、饱和沸腾区域及流量突降区域呈现不同的变化规律。单矩形通道出口平衡态含汽率对自然循环质量流速的影响较大，且在出口含汽率为0.01～0.02区间时自然循环质量流速到达峰值。随着单矩形通道入口温度的增加或系统压强的减小，通道内最大自然循环质量流速逐渐增加，而最大质量流速对应的热流密度逐渐减小。
In order to study the natural circulation flow characteristics of marine plate core or rectangular heat exchanger, a single rectangular channel experimental device of the natural circulation flow characteristics was established, and a series of experimental research and theoretical analysis of natural circulation flow characteristics were carried out. The results show that with the increase of heat flux, the flow characteristics of natural circulation in single rectangular channel show different changes in single-phase region, subcooled boiling region, saturated boiling region and sudden drop of flow rate region. The mass flow rate of natural circulation was great effected by the equilibrium vapor fraction at the outlet of a single rectangular channel, and the mass flow rate of natural circulation reaches its peak when the vapor fraction at the outlet is in the range of 0.01-0.02. With the increase of the inlet temperature of a single rectangular channel or the decrease of the system pressure, the maximum natural circulation mass flow rate in the channel gradually increase, while the heat flux corresponding to the maximum mass flow fate gradually decreases.
2021,43(11): 139-142 收稿日期：2021-02-08
DOI：10.3404/j.issn.1672-7649.2021.11.026
分类号：TL33
基金项目：国家自然科学基金资助项目(50806014)
作者简介：陈冲(1989-)，男，博士，工程师，研究方向为核科学与技术
参考文献：
[1] 任成, 杨星团, 刘志勇, 等. 一体化小型堆主回路自然循环稳态特性实验研究[J]. 原子能科学技术. 2014, 48(S1): 173-178.
[2] CHEN Chong, GAO Pu-Zhen, TAN Si-Chao, et al. Forced convective boiling heat transfer of water in vertical rectangular narrow channel[J]. Nuclear Engineering and Design. 2015, 291(2015): 133-144.
[3] LEE Han Ju, LEE Sang Yong. Heat transfer correlation for boiling flows in small rectangular horizontal channels with low aspect ratios[J]. International Journal of Multiphase Flow. 2001, 27(2001): 2043-2062.
[4] 幸奠川. 摇摆对矩形通道内流动阻力特性的影响研究[D]. 哈尔滨: 哈尔滨工程大学, 2013.
[5] SOBIERSKA E, KULENOVIC R, MERTZ R, et al. Experimental results of flow boiling of water in a vertical microchannel[J]. Experimental Thermal and Fluid Science. 2006, 31(2): 111-119.
[6] MAHMOUD M M., KARAYIAMMIS T G. Heat transfer correlation for flow boiling in small to micro tubes[J]. International Journal of Heat and Mass Transfer. 2013, 66(2013): 553-574.
[7] 郝承明, 付文, 彭敏俊, 等. 一体化反应堆强迫循环转自然循环过程瞬态特性分析[J]. 原子能科学技术. 2013, 47(2): 243-248.
[8] CHEN Chong, WU Wei, LI Liang-Cai, et al. Heat transfer characteristics of oscillating flow in a narrow channel under rolling motion[J]. Annals of Nuclear Energy. 2017, 110: 668-678.
[9] 田文喜, 秋穗正, 王甲强, 等. 中国先进研究堆稳态自然循环能力分析[J]. 核动力工程. 2007, 28(2): 13-18.
[10] 孙中宁, 曹夏昕, 吕襄波. 窄隙自然循环过冷沸腾流道中的温度分布特性[J]. 哈尔滨工程大学学报. 2008, 29(6): 563-567.
[11] 杨瑞昌, 刘若雷, 刘京宫, 等. 自然循环加热段内摩擦阻力及对流传热的实验研究[J]. 工程热物理学报. 2008, 29(1): 108-111.
