矩形通道内超临界CO2局部热流场可视化实验

doi:10.11949/0438-1157.20240056

化工学报

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矩形通道内超临界CO₂局部热流场可视化实验

曾港¹^,²(), 陈林¹^,³(), 杨董¹^,³, 袁海专², 黄彦平⁴

^1.中国科学院工程热物理研究所，北京 100190
^2.湘潭大学数学与计算科学学院，湖南湘潭 411105
^3.中国科学院大学航空宇航学院，北京 100049
^4.中国核动力研究设计院重点实验室，四川成都 610213

收稿日期:2024-01-02 修回日期:2024-03-07 出版日期:2024-03-12
通讯作者: 陈林
作者简介:曾港（1997—），男，博士研究生，zenggang@iet.cn
基金资助:
国家自然科学基金项目(52076207);中国科学院稳定支持基础研究领域青年团队计划(YSBR-043);中国核动力研究设计院-中核核反应堆热水工水力技术重点实验室开放基金(2020RETHOF-20102845-070801);中国科学院前沿科学重点研究计划(ZDBS-LY-JSC018);中国科学院人才启动经费;湖南省研究生科研创新项目(CX20220631);湘潭大学研究生科研创新项目(XDCX2022Y059)

Visualization of local boundary thermal flow field of supercritical CO₂ inside a rectangular channel

Gang ZENG¹^,²(), Lin CHEN¹^,³(), Dong YANG¹^,³, Haizhuan YUAN², Yanping HUANG⁴

^1.Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
^2.School of Mathematics and Computational Science, Xiangtan University, Xiangtan 411105, Hunan, China
^3.School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
^4.CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu 610213, Sichuan, China

Received:2024-01-02 Revised:2024-03-07 Online:2024-03-12
Contact: Lin CHEN

摘要/Abstract

摘要：

准确测量超临界CO₂的边界层流动传热特性，对于先进超临界CO₂能源化工循环系统的设计和安全运行具有重要意义。研究基于一种改进的非接触式的相移激光干涉系统，探究了湍流条件下超临界CO₂在矩形截面通道的边界热流场演化趋势。研究分析了基于长直通道局部热量输入条件下边界层密度场和温度场瞬态变化。这些定量信息可用于评估超临界CO₂在不同热通量（q = 14057， 5500， 2014 W/m²）条件下的局部传热准则数。结果表明：局部边界热传输使边界流体密度的快速下降（1.8 kg/m³）；浮升力驱动边界流体与主流区域混合并迅速达到平衡状态；高热流条件下温度、密度梯度变化迅速且显著，显示了热边界层的快速形成。

关键词: 对流, 流体动力学, 传递过程, 超临界二氧化碳, 测量

Abstract:

Accurate measurement of the boundary heat transfer characteristics of supercritical CO₂ flow-through a channel is crucial for the safe design and operation of advanced supercritical CO₂ cycle systems. This study focuses on visualizing the boundary heat flow field of supercritical CO₂ within a millimeter-scale rectangular cross-section channel under forced convection conditions. A modified non-contact phase-shift interferometric system was adopted for laser diagnostics. A phase-shift technique is utilized to analyze the transient variations in density and temperature fields following the sudden localized heat addition applied in the bottom boundary. These quantitative data are used to estimate the local criterion numbers for supercritical boundary heat transfer under different heat flux (q = 14057, 5500, 2014 W/m²). The results indicate that the rapid density reduction (1.8 kg/m³) occurs in a localized boundary transfer process. The buoyancy force induces the turbulent mixing from the boundary to the bulk flow region, eventually reaching equilibrium. Relatively dramatic and rapid shifts in temperature and density gradients occurs under high heat flux conditions, emphasizing the fast generation and transport of thermal boundary layers.

Key words: convection, hydrodynamics, transport process, supercritical carbon dioxide, measurement

中图分类号:

TQ 016

曾港, 陈林, 杨董, 袁海专, 黄彦平. 矩形通道内超临界CO₂局部热流场可视化实验[J]. 化工学报, DOI: 10.11949/0438-1157.20240056.

Gang ZENG, Lin CHEN, Dong YANG, Haizhuan YUAN, Yanping HUANG. Visualization of local boundary thermal flow field of supercritical CO₂ inside a rectangular channel[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240056.

图/表 10

图1 超临界CO2在水平矩形通道边界传递模型(通道长高宽为：640 × 50 × 32 mm)

Fig.1 Scheme of supercritical CO2 boundary transport model at the horizontal rectangular channel (The length, height, and width of the channel are 640, 50, and 32 mm, respectively)

图2 局部点位边界传热可视化实验系统 (系统放置在恒温室中，以保持稳定的环境温度；箭头表示流向)

Fig. 2 Schematic diagram of the experimental system for visualizing local point boundary heat transfer (The system is housed in a specially designed thermostatic room for a stable temperature ambient; arrow for the flow direction)

表 1 实验参数工况

Table 1 Summary of experimental parameters of cases

工況	p (MPa)	∆p (Pa)	T (K)	ρ (kg/m³)	q (W/m²)	Re (-)
1	7.933	62.02	306.57	570.66	14057	33616
2	7.972	62.84	306.52	586.77	5500	33036
3	7.967	45.21	306.4	593.01	2014	27218

图3 稳定差压流动阶段(0 - 3 s)的瞬时可视化(工况1; 加热t = 3.0 - 3.5 s; 20 fps)

Fig.3 Transient visualization in stabilized differential pressure flow (0 - 3 s) (Case 1; heating from t = 3.0 to 3.5 s; 20 fps)

图4 加热不稳定过程(3 - 10 s)的瞬时可视化 (工况1；加热t = 3.0 s - 3.5 s；20 fps)

Fig.4 Transient visualization in heating adding processes (3 - 10 s) (Case 1; heating from t = 3.0 to 3.5 s; 20 fps)

图5 热平衡过程(3 - 10 s)的瞬时可视化(工况1；加热t = 3.0 s - 3.5 s；帧率为20 fps)

Fig.5 Transient visualization in re-equilibrium processes (3 - 10 s) (Case 1; heating from t = 3.0 to 3.5 s; 20 fps)

图6 加热不稳定过程(3 - 10 s)的瞬时可视化 (工况3；加热t = 3.0 s - 3.5 s；20 fps)

Fig.6 Transient visualization in heating adding processes (3 - 10 s) (Case 3; heating from t = 3.0 to 3.5 s; 20 fps)

图7 垂直中心线上(x = 3.17 mm)的密度、温度定量曲线(工况1；加热t = 3.0 s - 3.5 s；20 fps)

Fig.7 Quantitative density and temperature profiles on the vertical centerline (x = 3.17 mm) (Case 1; heating from t = 3.0 to 3.5 s; 20 fps)

图8 垂直中心线上(x = 3.17 mm)的密度、温度定量曲线(工况3；加热t = 3.0 s - 3.5 s；20 fps)

Fig.8 Quantitative density and temperature profiles on the vertical centerline (x = 3.17 mm) (Case 3; heating from t = 3.0 to 3.5 s; 20 fps)

图9 脉冲加热下通道边界传热的局部Nusselt数变化(加热t = 3.0 s - 3.5 s；20 fps)

Fig. 9 Evolution of the local Nusselt number for boundary heat transfer under pulsed heated channel (heating from t = 3.0 to 3.5 s; 20 fps)

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矩形通道内超临界CO₂局部热流场可视化实验

Visualization of local boundary thermal flow field of supercritical CO₂ inside a rectangular channel

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