变管径空冷凝汽器空气侧换热特性研究及优化
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同济大学 机械与能源工程学院;上海市地面交通工具空气动力与热环境模拟重点实验室,同济大学 机械与能源工程学院;上海市地面交通工具空气动力与热环境模拟重点实验室,上海市地面交通工具空气动力与热环境模拟重点实验室,同济大学 上海地面交通工具风洞中心

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TK172

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国家国际科技合作专项项目(2014DFA10610)


Research and Optimization of Air Side Heat Transfer Characteristics of AirCooled Condenser with Variable Diameter Tube
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    摘要:

    针对四排等管径圆管直接空冷凝汽器冬季因换热不均易产生冻结的情况,提出了采用变管径翅片管束的思想。用计算流体力学(CFD)方法,对变管径翅片管束的流动换热特性进行数值模拟。研究发现,变管径翅片管束相比于等管径翅片管束,换热均匀性大幅提升,综合性能也有所提高;为提高该类换热器换热性能,将管束排布方式由近等边变化到近等速,凝汽器综合性能增大而换热均匀性变化不明显;在近等速排列变管径管束的翅片上加装涡发生器,综合性能进一步提高,换热均匀性对雷诺数的敏感性有所改变。

    Abstract:

    In view of the freeze due to the uneven heat transfer of the fourrowtube direct aircooled condenser, the idea of using variable diameter finnedtube bundles was put forward. Using the method of computational fluid dynamics (CFD), the numerical simulation of heat transfer characteristics of a variable diameter finnedtube bundles was conducted. It is found that the comprehensive performance and heat transfer uniformity of variable diameter finnedtube bundles are improved compared with the equivalent diameter finnedtube bundles. At the same time, in order to improve the poor thermal performance of this type of heat exchanger, the condenser performance increases but heat transfer uniformity does not change significantly when finnedtube bundles changes from nearly equilateral arrangement to nearly isokinetic arrangement. Moreover, the comprehensive performance of aircooled condenser is further improved and the sensitivity of heat transfer uniformity to Reynolds number changes after the addition of vortex generator.

    参考文献
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    [6]陈腾达. 新型空冷凝汽器散热翅片管束性能研究.上海:同济大学,2009.Tengda Chen. The Research on Performances of New Type Finned-tube Bundle for Heat Dissipation in the Air-cooled Condenser. Shanghai: Tongji University, 2009
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    [10]赵兰萍.杨志刚.管间距对矩形翅片椭圆管换热管束性能影响.同济大学学报,2016.01.022ZHAO lanping, YANG zhigang. Effect of Tube Pitches On performance of Rectangular Finned Elliptical Tube Bundles. Journal of Tongji University, 2016.01.022
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引用本文

赵兰萍,顾夕涛,杨志刚.变管径空冷凝汽器空气侧换热特性研究及优化[J].同济大学学报(自然科学版),2017,45(04):0589~0595

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  • 收稿日期:2016-04-29
  • 最后修改日期:2017-02-11
  • 录用日期:2017-01-16
  • 在线发布日期: 2017-04-28
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