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电站间冷系统空冷散热器翅片管束流动传热性能的数值研究

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Keywords: 间接空冷系统,空冷散热器,翅片管束,流动传热性能,性能评价指标

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Abstract:

空冷散热器为电站间接空冷系统的主要设备,研究空冷散热器翅片管束的流动传热特性,对于电站间冷系统的优化设计与高效运行具有重要意义。对间接空冷系统空冷散热器常用翅片管束流动传热性能进行了数值模拟研究,通过计算获得了空冷散热器冷却空气流动阻力和平均对流换热系数随迎面风速的变化规律,拟合得到了摩擦因子与努赛尔特数随雷诺数的变化关系。利用对流换热的综合性能评价标准(performanceevaluationcriteria,PEC),即Nu/f1/3,对6种翅片管束的流动传热性能进行了比较。结果表明,随迎面风速增加,空气对流换热增强,压降增加,翅片管的对流换热系数随之升高,摩擦因子降低,但是换热系数的增加幅度小于压降的增加幅度。Forgo型翅片管束综合流动传热性能优于椭圆型管束。本文研究结果为电站间冷系统空冷散热器的选型和优化设计提供了一定的理论依据。

References

[1]  Kim Y,Kim Y. Heat transfer characteristics of ?at plate ?nned-tube heat exchangers with large ?n pitch [J]. International Journal of Refrigeration, 2005,28(6):851-858.
[2]  He Y L,Tao W Q,Song F Q,et al. Three-dimensional numerical study of heat transfer characteristics of plain plate fin-and-tube heat exchangers from view point of field synergy principle[J]. International Journal of Heat and Fluid Flow, 2005,26(3):459-473.
[3]  Mon M S,Gross U. Numerical study of fin-spacing effects in annular-finned tube heat exchangers[J]. International Journal of Heat and Mass Transfer, 2004,47(8-9):1953-1964.
[4]  Yan W M,Sheen P J. Heat transfer and friction characteristics of fin-and-tube heat exchangers [J]. International Journal of Heat and Mass Transfer, 2000,43(9):1651-1659.
[5]  Ibrahim T A,Gomaa A. Thermal performance criteria of elliptic tube bundle in crossflow[J]. International Journal of Thermal Science, 2009,48(11):2148-2158.
[6]  Wilson A S,Bassiouny M K. Modeling of heat transfer for flow across tube banks[J]. Chemical Engineering and Processing, 2000,39(1):1-14.
[7]  柳飞,何国庚. 多排数翅片管空冷器风阻特性的数值模拟[J]. 制冷与空调, 2004,4(4):30-33. Liu Fei,He Guogeng.Numerical simulation of finned-tube air cooler with many rows[J].Refrigeration and Air-conditioning,2004,4(4)
[8]  张凯峰,杨立军,杜小泽,等. 空冷凝汽器波形翅片扁平管管束外空气流动传热特性[J]. 中国电机工程学报, 2008,28(26):24-28. Zhang Kaifeng,Yang Lijun,Du Xiaoze,et al.Flow and heat transfer characteristics of cooling air outside the flat wave-finned tube banks of air-cooled condensers [J].Proceedings of the CSEE,2008,28(26)
[9]  杨立军,张凯峰,杜小泽,等. 空冷凝汽器椭圆翅片椭圆管束外空气的流动与传热特性[J]. 动力工程, 2008,28(6):911-914. Yang Lijun,Zhang Kaifeng,Du Xiaoze,et al.Flow and heat transfer characteristics of cooling air outside elliptical tube bundles fixed with elliptical fin in air-cooled condenser[J].Journal of Power Engineering,2008,28(6)
[10]  明廷臻,党艳辉,刘伟,等. 椭圆管矩形翅片空冷器流体流动与传热特性数值分析[J]. 化工学报, 2009,60(6):1380-1384. Ming Tingzhen,Dang Yanhui,Liu Wei,et al.Numerical analysis of fluid flow and heat transfer characteristics on elliptical tube with rectangular fins of air cooler[J].CIESC Journal,2009,60(6)
[11]  Matos R S,Laursen T A,Vargas J V C,et al. Three- dimensional optimization of staggered finned circular and elliptic tubes in forced convection[J]. International Journal of Thermal Science, 2004,43(5):477-487.
[12]  Matos R S,Vargas J V C,Laursen T A,et al. Optimally staggered finned circular and elliptic tubes in forced convection[J]. International Journal of Heat and Mass Transfer, 2004,47(7):1347-1359.
[13]  Tiwari S,Maurya D,Biswas G,et al. Heat transfer enhancement in cross-?ow heat exchangers using oval tubes and multiple delta winglets[J]. International Journal of Heat and Mass Transfer, 2003,46(15):2841-2856.
[14]  Barman J,Ghoshal A K. Performance analysis of finned tube and unbaffled shell-and-tube heat exchangers [J]. International Journal of Thermal Science, 2007,46(12):1311-1317.
[15]  党艳辉,明廷臻,刘伟,等. 开孔矩形翅片椭圆管流动及传热特性的数值模拟[J]. 化工学报, 2009,60(12):2975-2980. Dang Yanhui,Ming Tingzhen,Liu Wei,et al.Numerical simulation of flow and heat transfer characteristics of rectangular-wing elliptical tube with interrupted holes[J].CIESC Journal,2009,60(12)
[16]  周兰欣,白中华,李富云,等. 管型和长宽比对空冷散热器换热特性的影响[J]. 汽轮机技术, 2007,49(6):417-419. Zhou Lanxin,Bai Zhonghua,Li Fuyun,et al.The effect of the fin type and the ratio of length and width on the heat exchanger character of the air cooling radiator [J].Turbine Technology,2007,49(6)
[17]  Yang L J,Tan H,Du X Z,et al. Thermal-flow characteristics of the new wave-finned flat tube bundles in air-cooled condensers[J]. International Journal Thermal Sciences, 2012(53):166-174.

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