化工进展 ›› 2023, Vol. 42 ›› Issue (10): 5083-5091.DOI: 10.16085/j.issn.1000-6613.2023-0322

• 化工过程与装备 • 上一篇    下一篇

非均匀高热通量内置纽带冷却通道阻力特性分析

朱戈1(), 毕勤成2, 田书建1, 颜建国3   

  1. 1.华北水利水电大学能源与动力工程学院,河南 郑州 450045
    2.西安交通大学动力工程及多相流国家重点实验室,陕西 西安 710049
    3.西安理工大学西北旱区生态水利国家重点实验室,陕西 西安 710048
  • 收稿日期:2023-03-03 修回日期:2023-05-21 出版日期:2023-10-15 发布日期:2023-11-11
  • 通讯作者: 朱戈
  • 作者简介:朱戈(1989—),男,讲师,研究方向为反应堆热工水力。E-mail:zhuge@ncwu.edu.cn
  • 基金资助:
    陕西省博士后科研项目(2018BSHEDZZ61);河南省科技攻关项目(232102320226);河南省科技攻关项目(222102230087)

Analysis of pressure drop characteristics of the cooling channel with twisted tape insert under high and non-uniform heat fluxes

ZHU Ge1(), BI Qincheng2, TIAN Shujian1, YAN Jianguo3   

  1. 1.School of Energy and Power Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, Henan, China
    2.State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
    3.State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, Shaanxi, China
  • Received:2023-03-03 Revised:2023-05-21 Online:2023-10-15 Published:2023-11-11
  • Contact: ZHU Ge

摘要:

以托卡马克装置中偏滤器的靶板水冷通道为背景,实验研究了非均匀热通量下有、无内置纽带的圆形冷却通道的阻力特性。工质为去离子水,主要参数为:质量流速G为(3~8)×103kg/(m2∙s)、实验段入口压力P为3MPa、4.2MPa、5MPa、等效单侧辐射热通量qe为5~10MW/m2。采用通电方式对偏置圆形通道进行加热,来模拟偏滤器受到高温等离子体的单侧辐射加热。对非均匀高热通量下的竖直上升圆形冷却通道进行流动阻力实验。详细讨论了内置纽带结构以及qeGP等系统参数对实验段阻力dP的影响:在单相流动区,实验段阻力主要受到内置纽带、质量流速和热通量的影响,有内置纽带的阻力显著高于无纽带的工况,且qe越低,G越高,则dP越大;在欠热沸腾流动区,dP与内置纽带、qeGP均有相关性:其中内置纽带和GdP的影响减小,PdP的影响增强。qe越高、G越高、P越低的工况,dP越大。对受热圆形通道的单相阻力关联式进行评估,结果表明:几乎所有关联式都高估了给定黏度比下的阻力系数比。根据实验数据拟合出适用于高质量流速和非均匀高热通量下的单相流动阻力关联式,其均方根误差为3.17%。

关键词: 非均匀高热通量, 内置纽带, 高质量流速, 阻力关联式, 偏滤器

Abstract:

In the context of the cooling channel of divertor target in the tokamak, the pressure drop experiments in circular channel with and without twisted tape insert were carried out under mass flux G=(3—8)×103kg/(m2∙s), system pressure P=3MPa, 4.2MPa, 5MPa and the equivalent one-side radiating heat flux qe=5—10MW/m2. The coolant was subcooled water. The off-center heating method was used to simulate the one-side radiating from high-temperature plasma in the tokamak of fusion reactor. The effects of the twisted tape and qe, G, P on pressure drop were discussed in detail. It showed that the dP was significantly affected by the twisted tape, G, and qe in the single-phase region. A lower qe and a higher G led to a higher dP. The dP was affected by the twisted tape, qe, G, and P in the subcooled boiling region. A higher qe, a higher G and a lower P lead to a higher dP. The correlations of pressure drop in the single-phase were assessed by the experimental data. The results showed that the ratio of heated and adiabatic single-phase friction factor were overvalued by almost all the single-phase correlations. A new pressure drop correlation was proposed to predict the single-phase pressure drop in an off-center heated circular channel under high mass fluxes and high heat fluxes. The root-mean-square error of the new correlation was 3.17%.

Key words: high and non-uniform heat fluxes, twisted tape insert, high mass fluxes, pressure drop correlations, divertor

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