脉动剪切层涡流运动下换热特性研究

高全杰; 王永龙; 汪朝晖

doi:10.13433/j.cnki.1003-8728.20180221

脉动剪切层涡流运动下换热特性研究

doi: 10.13433/j.cnki.1003-8728.20180221

武汉科技大学冶金装备及其控制教育部重点实验室, 武汉 430081

基金项目:

国家自然科学基金项目 51875419

湖北省教育厅科学技术研究计划重点项目 D20161102

详细信息

作者简介:
高全杰(1963-), 教授, 博士生导师, 研究方向为强化传热研究, gaoqj6328@126.com

中图分类号: D480.99
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- 被引次数: 0
出版历程
- 收稿日期: 2018-07-23
- 刊出日期: 2019-05-05

Analyzing Heat Transfer Characteristics of Pulsating Shear Layer under Eddy Motion

The Education Ministry Key Laboratory of Metallurgical Equipment and Control, Wuhan University of Science and Technology, Wuhan 430081, China

摘要

摘要: 基于自激振荡的脉冲效应，分析了自激振荡换热管的传热效果。利用大涡模拟数值计算方法，分析了自振管瞬时涡量变化对管道流场的影响，分析了随下游流道管径比L^*=d₃/d₂变化流向涡与法向涡的瞬时结构及其换热特性与阻力特性，并以综合性能评价系数评价管道的换热特性。结果表明：自振腔内剪切层中的离散涡与碰撞壁碰撞分散出的小涡随边向下游运动，并在下游流道近壁面处诱发新漩涡；L^*变化可以控制脉动剪切层的发展，随着L^*的增大流向涡的强度先增大后减小，法向涡逐渐向管道轴心发展；通过调节L^*可以控制管道的换热与阻力，当1.4 ≤ L^* ≤ 1.8时其传热效率提高45.1%~56.5%，综合性能系数最高可提高45.4%。
- 自激振荡 /
- 剪切层 /
- 换热特性
Abstract: Based on the impulse effect of self-excited oscillation, the heat transfer effect of the heat exchanger tube is analyzed. The influence of changes in instantaneous vorticity on the flow field of the downstream flow channel is analyzed with the large eddy simulation numerical calculation method. The transient structure, heat transfer characteristics and resistance characteristics of the downstream flow channel with L^*=d₃/d₂ are analyzed and evaluated with the comprehensive performance evaluation coefficient. The results show that the small vortices dispersed by the collision of the discrete vortex in the shear layer of the vibration cavity move downstream with the edge, thus inducing the new vortex generation. The change of L^* can control the development of the pulsating shear layer. With the increase of L^*, the strength of the stream-wise vortex first increases and then decreases, and the normal vortex gradually develops towards the pipe axis. By regulating L^*, the heat transfer and resistance can be controlled. When 1.4 ≤ L^* ≤ 1.8, the heat transfer efficiency is improved by 45.1% to 56.5%, and the comprehensive performance coefficient is up to 45.4%.
- self-excited oscillation /
- shear layer /
- heat transfer characteristics

HTML全文

图 1 自激振荡脉冲效应

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图 2 脉动剪切层涡流运动

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图 3 自激振荡换热管结构示意图

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图 4 模型网格划分

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图 5 网格无关系检测

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图 6 自振管涡量变化

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图 7 不同L^*的瞬态流向涡

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图 8 不同L^*的瞬态法向涡

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图 9 不同L^*的壁面剪切应力

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图 10 不同L^*的壁面努塞尔数

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表 1 自激振荡脉冲射流喷嘴主要参数

mm
参数名称	数值
上游入口管径d₀	12
下游出口管径d₃	6~14
上游入口流道长度l₁	40
下游入口流道长度l₂	12
下游入口流道长度l₃	200
自振腔入口直径d₁	5
自振腔出口直径d₂	6
自振腔室直径D	40
自振腔室长度L	12

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表 2 下游换热管道的E_Nu, E_f和η

L^*	E_Nu	E_f	η
1.0	0.672	0.572	0.811
1.4	1.451	1.713	1.376
1.8	1.562	1.241	1.454
2.2	0.326	0.857	0.343
2.6	0.287	0.487	0.365

下载: 导出CSV

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