• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2015, Vol. 36 ›› Issue (3): 21-26.doi: 10.3969/j.issn.1000-7229.2015.03.004

• 理论研究 • 上一篇    下一篇

直接空冷扁平翅片管束散热性能的实验研究

席新铭,董泽文,贺威,徐明,杨立军,杜小泽   

  1. 电站设备状态监测与控制教育部重点实验室(华北电力大学),北京市 102206
  • 出版日期:2015-03-01
  • 作者简介:席新铭(1979),男,硕士,工程师,主要从事电站节能及空冷技术研究工作; 董泽文(1990),男,硕士研究生,主要从事电站空冷技术研究工作; 贺威(1990),男,硕士研究生,主要从事电站空冷技术研究工作; 徐明(1989),男,硕士研究生,主要从事电站空冷技术研究工作; 杨立军(1970),男,博士,教授,主要从事强化传热基础理论及应用技术、火电站空冷系统设计与运行关键技术、燃料电池内的流动与传热 特性等研究工作; 杜小泽(1970),男,博士,教授,主要从事强化传热与节能、电站空冷技术、新能源发电等研究工作。
  • 基金资助:

    国家重点基础研究发展计划项目(973项目)(2015CB251503)。

Experimental Study on Heat Transfer Property of Direct Air-Cooling Flat Finned Tube Bundle

XI Xinming, DONG Zewen, HE Wei, XU Ming, YANG Lijun, DU Xiaoze   

  1. Key Laboratory of Power Plant Equipment Condition Monitoring and Control, North China Electric Power University, Beijing 102206, China
  • Online:2015-03-01

摘要:

扁平翅片管束是电站直接空冷系统的基本散热元件,研究其结构特点和流动换热特性,对于电站空冷系统的优化设计与高效运行具有重要意义。以直接空冷系统典型的连续蛇形翅片扁平管束为研究对象,通过实验研究不同的翅片间距对翅片间冷却空气的流动换热特性的影响,以及垂直进风和倾斜进风工况下,翅片散热性能的变化。结果表明,在相同的风速下,随着翅片间距的减小,翅片的换热系数增大,而阻力系数的变化相对复杂。实验条件下,翅片间距为56.8 mm时整体性能较优。翅片间距一定时,随着风速的增大,换热系数逐渐增大,阻力系数逐渐减小。但随着风速的增加,两者变化趋势渐缓。研究结果为扁平管连续翅片结构的进一步优化提供了基础数据。

关键词: 直接空冷, 扁平管蛇形翅片, 翅片间距, 流动与传热

Abstract:

Flat finned tube bundle is the basic radiating element of direct air-cooling system in thermal plant, so the study on its structure feature, flow and heat transfer property has important significance to the optimization design and efficient operation of air-cooling system in power plant. Taking the typical continuous serpentine fin flat tubes of direct air-cooling system as examples, this paper studied the impact of different fin spacings on the flow and heat transfer property of the cooling air and the changes of fins heat transfer performance under vertical and tilt flow conditions. The result shows that the heat transfer coefficient of fin grows up with the decrease of its spacing at the constant wind speed, while its resistance coefficient varies complexly. Under the experimental conditions, the flat tube with fin spacing of 56.8 mm has the best property. When the fin spacing is constant, with the growth of wind speed, the heat transfer coefficient increases and the resistance coefficient decreases gradually. However, the trends become gentle at high wind speed. The research results can provide basic datas for the further optimization of the structure of continuous flat tube fin.

Key words: direct air-cooling, serpentine fin flat tube, fin spacing, flow and heat transfer