腰槽开孔矩形翼涡流发生器的传热和流阻特性

Experimental study of heat transfer and flow resistance characteristics of rectangular wing vortex generator with waist groove

涡流发生器是一种广泛应用的被动强化传热元件,在换热器的换热壁面上以阵列形式布置。涡流发生器靠诱导和产生涡旋来削减或破坏壁面边界层从而达到强化换热。本文对安装腰槽开孔矩形翼涡流发生器和未冲孔矩形翼涡流发生器以及圆孔矩形翼涡流发生器的矩形通道进行了传热和流阻特性的实验研究。实验雷诺数范围为Re=1000~4000。结果表明:在相同雷诺数下,安装有腰槽开孔矩形翼涡流发生器的矩形通道的换热效果和流阻特性优于未冲孔矩形翼涡流发生器和圆孔矩形翼涡流发生器,腰槽开孔矩形翼涡流发生器综合换热性能最好。涡流发生器布置攻角和纵向间距对腰槽开孔矩形翼涡流发生器传热和流阻有较大影响,对比不同涡流发生器布置攻角和纵向间距,得出90°攻角布置和纵向间距为80mm布置的腰槽开孔矩形翼涡流发生器总和换热性能最好。

Vortex generator is a kind of element for passive heat transfer enhancement, usually on heat transfer surface of heat exchangers in the form of array layout. Vortex generators enhance heat transfer by inducing vortice to thin or destroy the wall boundary layer. The characteristics of heat transfer and flow resistance equipped with the rectangular wing vortex generators with waist groove, the rectangular wing vortex generator and the rectangular wing vortex generator with a hole in a rectangular channel was experimentally studied in this paper. Experimental Reynods number, Re, ranges from 1000 to 4000 The results showed that at the same Reynods number the rectangular wing vortex generators with waist groove have the best characteristics of heat transfer and flow resistance in a rectangular channel compared to the rectangular wing vortex generator and rectangular wing vortex generator with a hole. The attack angle and longitudinal distance of vortex generator have influence on heat transfer and flow resistance. It was found that the best performance of comprehensive heat transfer attack angle was 90 o and the best performance of comprehensive heat longitudinal distance was 80mm.