摘要
折齿型螺旋翅片管是在平齿型螺旋翅片管基础上发展而来的。它具有更好的强化换热性能,在烟气余热回收等领域,有着良好的应用前景。为了获得管间距对折齿型螺旋翅片管束换热与阻力特性的影响规律,对8个错列布置的折齿型螺旋翅片管束进行了数值模拟研究,并进行了模化试验验证。结果表明:在相同Re数和相对纵向间距S2/d o下,相对横向间距S1/d o=2.00～3.26范围内,存在最优S1/d o使得管束气侧Nu数最大,气侧Eu数随S1/d o的增大而明显减小;在相同Re数和S1/d o下,S2/d o=2.16～3.00范围内,存在最优S2/d o使得管束气侧Nu数最大,气侧Eu数随S2/d o的增大而稍有降低;数值模拟与模化试验结果偏差较小,相关的研究方法及结果可为进一步优化折齿型螺旋翅片管束布置提供参考。
The twisted-segmented-finned tube, which is developed from segmented-finned tube, has a good prospect in the heat recovery system because of its higher heat transfer enhancement performance. In order to obtain the effects of tube pitch on heat transfer and resistance characteristics, numerical simulation and modeling experiments on the twisted-segmen- ted-finned tube banks with staggered layouts are made. Results show that： with the same Re number and relative longitudi- nal pitch （S2/do ）, there is an optimum relative transverse pitch （S1/do）for maximum Nu number of air-side within the range 2.00 - 3.26 of relative transverse pitch, while the Eu number decreases obviously as the increase of relative trans- verse pitch; with the same Re number and relative transverse pitch, there is an optimum relative longitudinal pitch for max- imum Nu number of air-side within the range 2. 16 -3.00 of relative longitudinal pitch, while the Eu number decreases slightly as the increase of relative longitudinal pitch; the results of numerical simulation agree well with those of the experi- ment. The research methods and the results will provide guidance for the optimization of the layout of twisted-segmented- finned tube banks.
出处
《工业锅炉》
2013年第4期1-5,共5页
Industrial Boilers
关键词
折齿型螺旋翅片管
换热特性
阻力特性
数值模拟
试验
twisted-segmented-finned tube
heat transfer characteristic
resistance characteristic
numericalsimulation
modeling experiment
