翅形扰流片作用下的微通道换热特性

Study on the heat transfer characteristics of microchannels under the action of fin-shaped spoilers

陈巨辉 ¹苏潼 ¹李丹 ¹陈立伟 ¹吕文生 ²孟凡奇²

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作者信息

1. 哈尔滨理工大学机械动力工程学院,黑龙江哈尔滨 150080
2. 中国航发哈尔滨东安发动机有限公司,黑龙江哈尔滨 150066
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摘要

基于有限体积(FVM)离散方法和动网格技术,模拟三维矩形微通道内的翅形扰流片的主动扰流换热情况.模拟条件为层流Reynolds数50～250,扰流片的运动频率(f)10～50 Hz.结果表明,不同运动频率下的Nusselt数、摩阻系数(fr)及综合评价因子(PEC)均在一定范围内呈现类正弦变化,其周期与扰流片运动周期相同.在Re=50、f=10～50工况下,扰流片作用下的微通道PEC为0.75～1.52,并随频率的增加而上升.特别是在低频范围内,PEC表现出一定的单调性.通过引入翅形扰流片,微通道的传热效率得到了显著的提高,相较于光滑矩形微通道(PEC=1),在Re=50、f=10Hz工况下PEC提高了 5％,在Re=50、f=50 Hz 的条件下PEC提高了 30％.

Abstract

This study employs the finite volume method(FVM)and dynamic mesh technology to simulate the active disturbance heat transfer of fin-shaped vortex generators in a three-dimensional rectangular microchannel.The simulation conditions are laminar Reynolds numbers(Re)ranging from 50 to 250,and vortex generator oscillation frequencies(f)from 10 to 50 Hz.The results indicate that the Nusselt number(Nu),friction coefficient(fr),and performance evaluation criterion(PEC)exhibit quasi-sinusoidal variations within a certain range,with a period matching that of the vortex generator oscillation.Under the conditions of Re=50 and f=10-50 Hz,the PEC ranges from 0.75 to 1.52 and increases with frequency.Especially in the low frequency range,PEC shows a certain monotonicity.By introducing fin-shaped spoilers,the heat transfer efficiency of the microchannel has been significantly improved.Compared to a smooth rectangular microchannel(PEC=1),the PEC increases by 5％at Re=50 and f=10 Hz,and by 30％at Re=50 and f=50 Hz.

关键词

动网格/换热特性/热力学/翅形扰流片/微通道/数值模拟

Key words

dynamic grid/heat transfer characteristic/thermodynamics/fin-shaped spoiler/microchannel/numerical simulation

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基金项目

黑龙江省重点研发计划项目(GA21A301)

黑龙江省揭榜挂帅项目(2023ZXJ04A02)

黑龙江省自然科学基金研究团队项目(TD2023E002)

出版年

2024

化工学报

中国化工学会化学工业出版社

化工学报

CSTPCDCSCD北大核心

影响因子：1.26

ISSN：0438-1157

参考文献量40

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