单棒垂直方形通道临界热流密度实验研究

刘伟; 郭俊良; 张丹; 桂淼; 胡迎; 刘扬

doi:10.13832/j.jnpe.2022.01.0042

单棒垂直方形通道临界热流密度实验研究

doi: 10.13832/j.jnpe.2022.01.0042

刘伟^1,,
郭俊良²,
张丹¹,
桂淼²,
胡迎¹,
刘扬²

1.
中国核动力研究设计院核反应堆系统设计技术重点实验室，成都，610213
2.
西安交通大学核科学与技术学院，西安，710049

详细信息

作者简介:
刘　伟（1989—），男，博士，主要从事反应堆热工水力与安全分析研究，E-mail: liuwei0958@126.com

中图分类号: TL334
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出版历程
- 收稿日期: 2020-10-17
- 修回日期: 2020-11-20
- 刊出日期: 2022-02-01

Experimental Study on Critical Heat Flux of Vertical Square Channel with Single Rod

1.
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China
2.
School of Nuclear Science and Technology, Xi’an Jiaotong University, Xi’an, 710049, China

摘要

摘要: 采用R134a作为流体工质，对单棒垂直方形通道临界热流密度（CHF）进行了实验研究。流道横截面为19 mm×19 mm的方形通道，内置外径为9.5 mm的单根加热棒，用来模拟压水堆中典型栅元通道。实验工况通过流体模化方法覆盖了压水堆典型运行工况。实验结果表明，R134a在方形通道内的CHF参数趋势与圆管中水的CHF参数趋势相同，R134a可以替代水作为模化工质；通过对圆管Bowring关系式和Katto & Ohno关系式进行冷壁因子修正，可用于预测带有冷壁的方形通道的CHF；Katto的流体模化方法适用于带有冷壁的方形通道。
- 临界热流密度 /
- 方形通道 /
- 实验研究
Abstract: The critical heat flux (CHF) of vertical square channel with single rod is experimentally studied by using R134a as the working fluid. A square channel with a flow channel cross section of 19 mm×19 mm and a single heating rod with an outer diameter of 9.5 mm are used to simulate the typical cell channel in PWR. The experimental conditions cover the typical operating conditions of PWR by fluid modeling method. The experimental results show that the CHF parameter trend of R134a in the square channel is the same as that of water in the circular tube, and R134a can replace water as a modeling fluid; After corrected with cold wall factor, the circular tube Bowring relation and Katto & Ohno relation can be used to predict CHF in square channel with cold wall; Katto’s fluid modeling method is suitable for square channel with cold wall.
- Critical heat flux(CHF) /
- Square channel /
- Experimental study

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图 1 R134a CHF实验装置

Figure 1. R134a CHF Experimental Apparatus

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图 2 单棒布置示意图

Figure 2. Schematic Diagram of Single Rod Arrangement

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图 3 实验段横截面示意图

Figure 3. Schematic Diagram of Cross-section of Experimental Section

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图 4 CHF随临界含汽率的变化趋势

q—CHF，下同

Figure 4. Variation Trend of CHF with Critical Steam Content

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图 5 CHF随压力的变化趋势

Figure 5. Variation Trend of CHF with Pressure

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图 6 CHF随入口过冷度的变化趋势

Figure 6. Variation Trend of CHF with Inlet Undercooling

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图 7 CHF随质量流速的变化趋势

Figure 7. Variation Trend of CHF with Mass Flow Rate

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图 8 Katto & Ohno关系式预测值与实验值的对比

q_pre—CHF预测值；q_exp—CHF实验值

Figure 8. Comparison between Predicted Value and Experimental Value of Katto & Ohno Relation

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图 9 Bowring关系式预测值与实验值的对比

Figure 9. Comparison between Predicted Value and Experimental Value of Bowring Relation

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表 1 Katto模化方法

Table 1. Modeling Method of Katto

类型	准则
几何相似	${\left( {\dfrac{{{L_{\rm{h}}}}}{{{D_{\rm{h}}}}}} \right)_{{\rm{R134a}}}} = {\left( {\dfrac{{{L_{\rm{h}}}}}{{{D_{\rm{h}}}}}} \right)_{{\rm{Water}}}}$
水力学相似	${\left( {\dfrac{{{\rho _{\rm{f}}}}}{{{\rho _{\rm{g}}}}}} \right)_{{\rm{R134a}}}} = {\left( {\dfrac{{{\rho _{\rm{f}}}}}{{{\rho _{\rm{g}}}}}} \right)_{{\rm{Water}}}}$
热力学相似	${\left( {\dfrac{{\Delta {h_{{\rm{in}}}}}}{{{h_{{\rm{fg}}}}}}} \right)_{{\rm{R134a}}}} = {\left( {\dfrac{{\Delta {h_{{\rm{in}}}}}}{{{h_{{\rm{fg}}}}}}} \right)_{{\rm{Water}}}}$
韦伯数（We）相同	${\left( {\dfrac{ {G\sqrt D } }{ {\sqrt { {\rho _{_{\rm{f} } } }\sigma } } } } \right)_{ {\rm{R134a} } } } = {\left( {\dfrac{ {G\sqrt D } }{ {\sqrt { {\rho_{ _{\rm{f} }} }\sigma } } } } \right)_{ {\rm{Water} } } }$
L_h—加热高度；D_h—热当量直径；Δh_in—入口焓升；h_fg—汽化潜热；G—质量流速；σ—表面张力；ρ_f和ρ_g—液相和气相密度；D—管道直径

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表 2 实验工况

Table 2. Experimental Conditions

参数	R134a	水
压力/MPa	1.8、2.1、2.7、4	10.9、12.5、14.1、15.6
质量流速/[kg· (m²·s)⁻¹]	600~2100	800~3000
入口过冷度(ΔT_in)/℃	10~40	利用Δh_in/h_fg相等模化

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表 3 本实验的不确定度

Table 3. Uncertainty of Experiment

参数	不确定度/%
长度、直径、厚度	±0.1、±0.5、±3.0
压力	±0.7
温度	±1.3
质量流速	±1.7
功率	±2.2
热流密度	±5.1

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参考文献(10)

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