不同管束布置方式下含有空气的蒸汽自然对流冷凝换热特性分析

刘乐; 陈文振; 王珏; 王琮; 胡晨

doi:10.13832/j.jnpe.2022.03.0094

不同管束布置方式下含有空气的蒸汽自然对流冷凝换热特性分析

doi: 10.13832/j.jnpe.2022.03.0094

刘乐^{1, 2,},
陈文振^1, ,,
王珏^{1, 2},
王琮²,
胡晨²

1.
海军工程大学核能科学与工程学院，武汉，430033
2.
武汉第二船舶设计研究所，武汉，430064

基金项目: 国家重点研发计划资助项目（2017YFC0307800/06）

详细信息

作者简介:
刘　乐（1987—），男，博士研究生，现从事核动力装置总体设计和安全评价方面的研究，E-mail：liule06031623@126.com

通讯作者:
陈文振，E-mail: cwz2@21cn.com

中图分类号: TL332
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- 文章访问数: 230
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- 被引次数: 0
出版历程
- 收稿日期: 2021-04-15
- 录用日期: 2021-07-07
- 修回日期: 2021-07-08
- 刊出日期: 2022-06-07

Analysis of Heat Transfer Characteristics of Natural Convection Condensation of Steam Containing Air under Different Tube Bundle Arrangements

Liu Le^{1, 2
,},
Chen Wenzhen^{1
, ,},
Wang Jue^{1, 2},
Wang Cong²,
Hu Chen²

1.
Department of Nuclear Energy Science and Engineering, Naval University of Engineering, Wuhan, 430033, China
2.
Wuhan Second Ship Design and Research Institute, Wuhan, 430064, China

摘要

摘要: 为研究非能动安全壳冷却系统（PCCS）热交换器管束布置对自然对流条件下含有空气的蒸汽冷凝换热特性的影响，采用气体组分输运方程和冷凝模型耦合，对单管、单排到五排管束通道内冷凝换热过程进行数值研究。研究发现，管束区内存在由于管间高浓度空气层干扰使冷凝换热能力减弱的“抑制效应”，以及由于水蒸气壁面冷凝导致气体横向流动使壁面冷凝能力强化的“抽吸效应”。对不同管束结构下2种效应对冷凝换热的影响进行分析，结果表明，随着管束排数的增加，2种效应对冷凝换热的影响逐渐增强，导致冷凝管周向局部冷凝换热能力不均匀性增加，其中五排管束周向局部冷凝换热系数（HTC）最大值为单管的2.3倍，最小值仅为单管的44.7%。在双排、三排和四排管束中，正四边形布置管束的冷凝换热能力优于正三角形布置，而五排管束中，正三角形布置的冷凝换热能力更强。本研究可对PCCS热交换器管束布置优化提供参考。
- 自然对流 /
- 管束 /
- 蒸汽冷凝 /
- 组分输运模型 /
- 数值模拟
Abstract: In order to study the effect of tube bundle arrangement of heat exchanger in passive containment cooling system (PCCS) on the condensation heat transfer characteristics of steam containing air under natural convection conditions, the condensation heat transfer process in channels of single tube, single-row to five-row tube bundles is numerically studied by coupling gas component transport equation and condensation model. It is found that there is a “inhibiting effect” that reduces the condensation heat transfer capacity due to the interference of high-concentration air layers between tube bundles, and a “suction effect” that strengthens the condensation capacity on the wall due to the transverse flow of gas caused by water vapor wall condensation. The influence of such two effects on condensation heat transfer under different tube bundle structures is analyzed. The results show that with the increase of the number of rows of tube bundles, the influence of the two effects on the condensation heat transfer gradually increases, leading to the increase of non-uniformity of circumferential local condensation heat transfer capacity of condensing tubes. Among them, the maximum circumferential local condensation heat transfer coefficient (HTC) of five-row tube bundles is 2.3 times that of single tube, and the minimum is only 44.7% of that of single tube. In the double-row, three-row and four-row tube bundles, the condensation heat transfer capacity of the regular quadrilateral arrangement is better than that of the regular triangle arrangement, while in the five-row tube bundle, the condensation heat transfer capacity of the regular triangle arrangement is stronger. This study can provide a technical reference for the optimization of the tube bundle arrangement of the PCCS heat exchanger.
- Natural convection /
- Tube bundle /
- Steam condensation /
- Component transport model /
- Numerical simulation

HTML全文

图 1 计算结果与试验结果对比

Figure 1. Comparison of Calculated Results and Test Results

下载: 全尺寸图片幻灯片

图 2 管束布置示意图

Figure 2. Schematic Diagram of Tube Bundle Layout

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图 3 单排管束高浓度边界层厚度及HTC随周向角的变化　　　　　　　　

Figure 3. Variation of High-concentration Boundary Layer Thickness and HTC with Circumferential Angle of Single-row Tube Bundle

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图 4 单排、单管布置横向流线图和空气边界层分布

Figure 4. Transverse Streamline Diagram and Air Boundary Layer Distribution of Single Row and Single Tube Layout

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图 5 双排、三排布置局部HTC随周向角的分布

Figure 5. Distribution of Local HTC with Circumferential Angle in Double-row and Three-row Arrangement

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图 6 多排布置横向流线图和空气边界层分布

Figure 6. Transverse Streamline Diagram and Air Boundary Layer Distribution of Multi-row Layout

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图 7 四排、五排布置局部HTC随周向角的分布

Figure 7. Distribution of Local HTC with Circumferential Angle in Four-row and Five-row Arrangement

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表 1 COPAIN试验工况

Table 1. COPAIN Test Condition

工况	入口速度/ (m·s⁻¹)	压力/ MPa	入口温度/K	壁面温度/K	空气质量分数
P0444	0.50	0.102	351.53	299.70	0.773
P0264	0.52	0.119	344.87	313.28	0.867
P0443	1.00	0.102	352.33	300.06	0.772
P0242	2.00	0.446	422.50	304.28	0.990

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表 2 不同布置方式下管束的平均HTC

Table 2. Average HTC of Tube Bundles under Different Arrangements

序号	管束布置形式	平均HTC/(W·m⁻²·K⁻¹)
1	单管	338.900
2	单排	336.225
3	双排正四边形布置	335.425
4	双排正三边形布置	332.275
5	三排正四边形布置	348.725
6	三排正三边形布置	344.800
7	四排正四边形布置	363.850
8	四排正三边形布置	360.975
9	五排正四边形布置	374.975
10	五排正三边形布置	387.325

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参考文献(9)

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