摘要
异型换热管因流阻小、换热效果好等优势在换热器研究领域受到了广泛关注。为了帮助异型管更好地应用于工程领域,采用数值模拟方法,在一定入口参数范围内对具有6种椭圆度的椭圆管、半椭圆管和扁管的管外湿气体冷凝换热流场进行了模拟。利用综合性能参数J F、析湿系数ζ等参数分析了异型管外冷凝换热性能随椭圆度变化的规律。然后尝试将椭圆度为0.5的3种异型管分别应用于某圆管烟气冷凝器,并基于数值模拟结果获得异型管烟气冷凝器的传热传质性能。结果表明:3种异型管烟气冷凝器的流动传热综合性能比圆管烟气冷凝器更优,其中半椭圆管烟气冷凝器的J F比圆管烟气冷凝器增大了10.95%,ζ增大了6.04%,冷凝换热性能最优。
Special-shaped heat exchange tubes have received extensive attention in the research field of heat exchangers due to their performance advantages such as low flow resistance and good heat transfer efficiency.In order to assist better application of special-shaped tubes in engineering field,numerical simulation method was used to simulate wet gas condensation heat exchange flow field outside the tubes of elliptical tubes,semi elliptical tubes,and flat tubes with six different ellipticities within a certain range of inlet parameters.The variation law of the external condensation heat transfer performance of the special-shaped tube with ellipticity was analyzed by using such parameters as the comprehensive performance parameter J F and the moisture evolution coefficientζ.Then,attempts were made to apply three kinds of special-shaped tubes with an ellipticity of 0.5 respectively to a certain circular tube flue gas condenser,and the heat and mass transfer performance of the special-shaped tube flue gas condenser was obtained based on the numerical simulation results.Results show that the comprehensive performance of the three types of special-shaped tube flue gas condensers is better than that of the circular tube flue gas condenser.Among them,the J F value of the semi elliptical tube flue gas condenser is 10.95%higher than that of the circular tube flue gas condenser,and theζis 6.04%higher.Its condensation heat transfer performance is the best.
作者
张莉
刘宏杰
董跃
李健
ZHANG Li;LIU Hongjie;DONG Yue;LI Jian(College of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 201306,China;Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems,Shanghai 201306,China;Goertek Microelectronics Co.,Ltd,Qingdao 266100,Shandong Province,China;Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200240,China)
出处
《动力工程学报》
北大核心
2025年第8期1234-1242,1277,共10页
Journal of Chinese Society of Power Engineering
基金
上海市科委资助项目(23010501300)。
关键词
异型管
冷凝换热
烟气冷凝器
数值分析
special-shaped tubes
condensation heat transfer
flue gas condenser
numerical simulation
