储热过程竖排圆柱表面熔盐自然对流传热规律研究

doi:10.3969/j.issn.1674-1951.2021.07.009

华电技术 ›› 2021, Vol. 43 ›› Issue (7): 54-61.doi: 10.3969/j.issn.1674-1951.2021.07.009

储热过程竖排圆柱表面熔盐自然对流传热规律研究

于强¹(), 何聪¹, 智瑞平¹, 鹿院卫¹^,^*(), 吴玉庭¹, 杨桂春²

1.北京工业大学传热强化与过程节能教育部重点实验室暨传热与能源利用北京市重点实验室,北京 100124
2.中国寰球工程有限公司北京分公司,北京 100012

收稿日期:2021-05-07 修回日期:2021-06-15 出版日期:2021-07-25 发布日期:2021-07-27
通讯作者: 鹿院卫
作者简介:于强（1988—）,男,山东菏泽人,在读博士研究生,从事熔盐传热蓄热方面的研究工作（E-mail： yuqiang@emails.bjut.edu.cn）。
基金资助:
国家自然科学基金项目(52076006);国家重点研发计划(2017YFB0903603);内蒙古科技重大专项(2019ZD014)

Research on natural convection heat transfer of molten salts on vertical cylinder surface during heat storage

YU Qiang¹(), HE Cong¹, ZHI Ruiping¹, LU Yuanwei¹^,^*(), WU Yuting¹, YANG Guichun²

1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation/Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing University of Technology,Beijing 100124,China
2. China Huanqiu Contracting and Engineering （Beijing） Company Limited,Beijing 100012,China

Received:2021-05-07 Revised:2021-06-15 Online:2021-07-25 Published:2021-07-27
Contact: LU Yuanwei

摘要/Abstract

摘要：

为了得到储热过程竖排圆柱表面熔盐自然对流传热规律,通过数值模拟的方法,对圆柱间距S/D=5~10（S为相邻2根圆柱之间的间距,D为管排圆柱的直径）的2~8根竖排圆柱表面自然对流传热进行了研究。结果表明：管排中每一根圆柱表面的自然对流传热与该圆柱在管排中的位置和圆柱间距S/D有关。整个管排圆柱表面熔盐自然对流传热平均努赛尔数（Nu_a）是由圆柱的间距S/D、圆柱根数N和瑞利数（Ra）决定的。当S/D较小时（S/D=5）,多根管排圆柱表面熔盐自然对流传热Nu_a随着管排中圆柱根数的增加而减小;当S/D较大时（S/D=10）,多根管排圆柱表面熔盐自然对流传热Nu_a随着管排中圆柱根数的增加而增大。研究结果可以为熔盐蓄热装置设计提供理论依据。

关键词: 自然对流, 熔盐, 管排, 圆柱间距, 努赛尔数（Nu）, 瑞利数（Ra）, 传热规律, 碳中和

Abstract:

In order to obtain the natural convection heat transfer law by of molten salts on the surface of vertical cylinders during heat charging,a numerical simulation was made on the natural convection heat transfer around a cylinder array with 2 to 8 vertical pillars whose cylindrical spacing （ S/D）=5~10 （S is the distance between two adjacent cylinders,D is the diameter of the cylinder）.The results show that the natural convection heat transfer on each cylinder surface is related to the position of the cylinder in the row and the its S/D.The average Nu（Nu_a）of the natural convection heat transfer made by molten salt around the whole cylinder array is determined by the S/D,the number of cylinders（N） and Ra.When S/D is small（S/D=5）,the Nu_a of natural convection heat transfer of molten salt on the cylinders' surface will decrease with the number of cylinders in the row.When S/D is large（S/D=10）,the Nu_a of natural convection heat transfer on the cylinders' surface will augment with the number of cylinders in the row.The research results can provide theoretical basis for the design of molten salt heat storage device.

Key words: natural convection, molten salt, cylinder array, cylindrical spacing, Nu, Ra, heat transfer law, carbon neutrality

中图分类号:

TK124

于强, 何聪, 智瑞平, 鹿院卫, 吴玉庭, 杨桂春. 储热过程竖排圆柱表面熔盐自然对流传热规律研究[J]. 华电技术, 2021, 43(7): 54-61.

YU Qiang, HE Cong, ZHI Ruiping, LU Yuanwei, WU Yuting, YANG Guichun. Research on natural convection heat transfer of molten salts on vertical cylinder surface during heat storage[J]. Huadian Technology, 2021, 43(7): 54-61.

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参考文献 20

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项目	底部圆柱表面的局部对流换热系数
项目	h₁	h₂	h₃	h₄	h₅
S/D=5	727.45	768.35	751.76	731.84	713.89
S/D=6	732.84	791.61	782.61	767.12	752.60
S/D=7	726.86	809.26	806.97	796.07	783.46
S/D=8	723.51	823.89	827.47	820.36	810.19
S/D=9	723.55	837.15	845.81	841.75	833.55
S/D=10	723.98	848.55	861.95	860.49	854.53

储热过程竖排圆柱表面熔盐自然对流传热规律研究

Research on natural convection heat transfer of molten salts on vertical cylinder surface during heat storage

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