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开孔矩形翅片椭圆管流动与换热特性的数值研究 预览 被引量:16

THE FLOW AND HEAT TRANSFER CHARACTERISTICS OF NUMERICAL INVESTIGATION OF RECTANGULAR-FIN ELLIPTIC-TUBE WITH INTERRUPTED HOLES
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摘要 对电站直接空冷系统的基本换热元件矩形翅片椭圆管建立三维物理数学模型,对空气侧流动和传热性能进行数值研究。分析了不同迎面风速下翅片上无扰流孔和开有扰流孔两种情况下矩形翅片表面的局部表面传热系数分布规律,发现椭圆基管后存在的尾流区使得翅片的强化换热作用减弱。比较了扰流孔的尺寸、数目和位置对管外空气侧流动与换热的影响,结果表明:扰流孔尺寸对流动与换热存在明显影响,而扰流孔数目和位置的影响相对比较小。 Applying the 3D physics- mathematics models, the numerical analysis is performed for the air-side flow and heat transfer characteristics of rectangular-fin elliptic-tube, which are the fundamental element used in direct air-cooled power plant. The local heat transfer coefficients distributions on the surface of fins with and without interrupted holes were discussed under different velocities. The results indicate that it is the wake region behind the tube that weakens the heat transfer of tube fin. The influences of the dimension, number and position of interrupted holes to the finned-tube outside are also compared. Results show that the dimension has the obvious influence to the flow and heat transfer characteristics, while that of number and position is comparative small.
作者 张来 杜小泽 杨立军 冯丽丽 杨勇平 ZHANG Lai, DU Xiao-Ze, YANG Li-Jun, FENG Li-Li, YANG Yong-Ping (Department of Power Engineering, Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206 China)
出处 《工程热物理学报》 EI CAS CSCD 北大核心 2006年第6期 990-992,共3页 Journal of Engineering Thermophysics
基金 国家自然科学基金资助项目(No.50576023)
关键词 对流换热 流动特性 矩形翅片椭圆管 convection heat transfer flow characteristics rectangular-fin elliptic-tube
作者简介 张来(1979-),男,山东安丘人,硕士研究生,主要从事电站热力过程优化的研究。
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