将仿生鸟喙式结构引入涡流发生器中,结合Fluent软件在Re=6000~26800范围内对其换热能力j、流动阻力f与综合热性能CPEC变化规律进行研究。结果表明：鸟喙式涡流发生器是一种高换热低流阻的高效换热元件,在Re=13000时CPEC较传统矩形翼提高62.35%。此外其综合热性能随着迎流攻角α的增大先增大后减小,在α=30°时达到最大,较空通道提高26.83%。增大斜截角度β是降低流动阻力的一种有效方式,β=24°的结构较无截角结构流阻f降低47.03%。
Abstract
Installing vortex generators on the fins can significantly improve the shell-side heat transfer efficiency of shell-and-tube heat exchangers, but the improvement of heat transfer capacity often leads to the increase of flow resistance. Therefore, most of the traditional vortex generators have the problem of low comprehensive efficiency with high heat transfer and high flow resistance. In this study, the bionic bird beak structure was introduced into the vortex generator, and the heat transfer capacity j, flow resistance f and comprehensive thermal performance CPEC were studied in the range of Re=6000~26800 by Fluent software. The results show that the bird-beak vortex generator is an efficient heat transfer element with high heat transfer and low flow resistance. When Re=13000, the CPEC is 62.35% higher than that of the traditional rectangular wing. In addition, its heat transfer capacity will increase first and then decrease with the increase of the angle of attack α, reaching the maximum at α=30°, which is 26.83% higher than that of the empty channel. Increasing the oblique cut angle β is an effective way to reduce the flow resistance. The flow resistance f of the structure withβ=24° is 47.03% lower than that of the structure without cut angle.
关键词
数值模拟 /
换热性能 /
导热系数 /
涡流发生器 /
综合热性能
Key words
numerical simulation /
heat transfer performance /
thermal conductivity /
eddy current generator /
comprehensive thermal performance
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