矩形通道中不同涡流发生器对换热和压降的影响  

Influence of Different Vortex Generators on Heat Transfer Enhancement and Pressure Drop Characteristics in a Rectangular Channel

作　　者：叶秋玲[1] 周国兵[1] 程金明[1] 周少祥[1] 程伟良[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,北京市昌平区102206

出　　处：《中国电机工程学报》2010年第11期86-91,共6页Proceedings of the CSEE

基　　金：高等学校博士学科点专项科研基金项目(20070079018);北京市暖燃重点实验室开放课题(KF200708);"十一五"国家科技支撑计划项目(2006BAA04B02)~~

摘　　要：对矩形通道内布置单排一对直角三角翼、矩形翼等以及研制的斜截半椭圆、半圆柱面涡流发生器的换热和压降特性进行了对比性实验。实验雷诺数Re在700～26800范围内,所有涡流发生器采用相同的高宽比、斜截倾角、迎流攻角和前沿间距。结果表明,斜截半椭圆柱面强化换热和压降综合性能最好。Re为700、4000和2×104时,最高局部换热系数分别约比平直流道增加了16.9%,9.3%,11.4%。斜截半椭圆柱面的阻力损失比矩形翼要小得多,Re为2×104时,约比矩形翼低37.9%。经分析,斜截半柱面涡流发生器能够产生端部涡和根部马蹄涡系,具有优越的强化换热效果,且由于其流线型柱面而压降较低。柱面相对柱体加工简单,制作方便。The performance of heat transfer enhancement and pressure drop characteristics of a pair of single-row vortex generators （VGs） in a rectangular channel were experimentally investigated. Different shapes of VGs such as delta winglets, rectangular winglets, and newly developed oblique-cut semi-elliptic cylinder shell, oblique-cut semi-circular cylinder shell were selected to carry out comparative experiments with Reynolds number （Re） ranged from 700 to 26800. The same aspect ratio, elevation angle, attack angle and spacing of the leading-edges were considered for all VGs. The results showed that oblique-cut semi-elliptic cylinder shell has the best comprehensive performance of heat transfer enhancement and pressure drop characteristics. The highest local heat transfer coefficients are shown to be 16.9%, 9.3%, 11.4% higher than those of the flat channel for Re = 700, 4 000 and 2~104,. respectively. The pressure drop of oblique-cut semi-elliptic cylinder shell is much lower than the rectangular winglet by 37.9% at Re = 2×10^4. It is suggested that both tip vortex and horseshoe vortices generated by oblique-cut semi-cylinder shell VGs with lower pressure drop due to the streamlined cylindrical structure. Oblique-cut semi-cylinder shells are relatively simpler and more convenient to be machined than the oblique-cut semi-cylinders.

关 键 词：强化换热 涡流发生器 端部涡 马蹄涡系 压降 

分 类 号：TK172[动力工程及工程热物理—热能工程]