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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

高全杰, 王永龙, 汪朝晖. 脉动剪切层涡流运动下换热特性研究[J]. 机械科学与技术, 2019, 38(5): 691-697. doi: 10.13433/j.cnki.1003-8728.20180221
引用本文: 高全杰, 王永龙, 汪朝晖. 脉动剪切层涡流运动下换热特性研究[J]. 机械科学与技术, 2019, 38(5): 691-697. doi: 10.13433/j.cnki.1003-8728.20180221
Gao Quanjie, Wang Yonglong, Wang Zhaohui. Analyzing Heat Transfer Characteristics of Pulsating Shear Layer under Eddy Motion[J]. Mechanical Science and Technology for Aerospace Engineering, 2019, 38(5): 691-697. doi: 10.13433/j.cnki.1003-8728.20180221
Citation: Gao Quanjie, Wang Yonglong, Wang Zhaohui. Analyzing Heat Transfer Characteristics of Pulsating Shear Layer under Eddy Motion[J]. Mechanical Science and Technology for Aerospace Engineering, 2019, 38(5): 691-697. 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
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

Analyzing Heat Transfer Characteristics of Pulsating Shear Layer under Eddy Motion

  • 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%。
  • 图  1  自激振荡脉冲效应

    图  2  脉动剪切层涡流运动

    图  3  自激振荡换热管结构示意图

    图  4  模型网格划分

    图  5  网格无关系检测

    图  6  自振管涡量变化

    图  7  不同L*的瞬态流向涡

    图  8  不同L*的瞬态法向涡

    图  9  不同L*的壁面剪切应力

    图  10  不同L*的壁面努塞尔数

    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
    下载: 导出CSV

    表  2  下游换热管道的ENu, Efη

    L* ENu Ef 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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出版历程
  • 收稿日期:  2018-07-23
  • 刊出日期:  2019-05-05

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