摘要
在雷诺数Re=7 000～26 800范围内,对矩形通道分别布置单排一对斜截半椭圆柱面、矩形小翼等6种涡流发生器的强化传热效果和压降特性进行数值模拟,并用综合评价因子对比分析各涡流发生器强化传热与流动阻力综合性能。结果表明,斜截半椭圆柱面综合性能最好,分别比矩形小翼、斜截半圆柱面、斜截半椭圆柱体高11.40%～21.88%、1.98%～2.11%、2.53%～3.50%;具有较小迎流截面和流线型设计的斜截半椭圆柱面产生的流阻最低,最高可比矩形小翼低22.45%,比斜截半圆柱面和斜截半椭圆柱体略低。斜截半柱面是一种具有较低阻力损失和较好综合性能的新型涡流发生器。
Numerical simulations were carried out to study the performance of heat transfer enhancement and pressure drop of a pair of single-row vortex generators （VGs） such as oblique-cut semi-elliptic cylinder shells, rectangular winglets, etc. （6 types）, which were installed in a rectangular channel, respectively. The Reynolds number （Re） ranged from 7000 to 26800. Then the comprehensive performances of heat transfer enhancement and flow loss of these VGs were analyzed by comparing the comprehensive evaluation factor. The results showed that the oblique-cut semi-elliptic cylinder shell has the highest value of R, which is 11.40%~21.88%, 1.98%~2.11% and 2.53%~3.50% higher than those of rectangular winglet, oblique-cut semi-circular cylinder shell and oblique-cut semi-elliptic cylinder, respectively. The flow loss of oblique-cut semi-elliptic cylinder shell is the lowest due to its smaller frontal surface and streamlined design, which can be 22.45% lower than that of rectangular winglet, and also slightly lower than oblique-cut semi-circular cylinder shell and oblique-cut semi-elliptic cylinder. Oblique-cut semi-cylinder shell is a novel type of VG with lower flow loss and better comprehensive performance.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第35期55-60,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)
中央高校基本科研业务费专项基金(09MG25)
中国电机工程学会电力青年科技创新项目(2008)~~
关键词
强化传热
流动阻力
数值模拟
斜截半椭圆柱面
综合评价因子
heat transfer enhancement
flow resistance
numerical simulation
oblique-cut semi-elliptic cylinder shell
comprehensive evaluation factor
