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圆形肋柱通道强化换热流动机理实验研究

段敬添 张科 徐进 雷蒋 武俊梅

段敬添,张 科,徐 进,等. 圆形肋柱通道强化换热流动机理实验研究[J]. 实验流体力学,2021,35(4):10-18 doi: 10.11729/syltlx20200134
引用本文: 段敬添,张 科,徐 进,等. 圆形肋柱通道强化换热流动机理实验研究[J]. 实验流体力学,2021,35(4):10-18 doi: 10.11729/syltlx20200134
DUAN J T,ZHANG K,XU J,et al. Experimental investigation on flow mechanism driving heat transfer enhancement in a channel with circular pin fins[J]. Journal of Experiments in Fluid Mechanics, 2021,35(4):10-18. doi: 10.11729/syltlx20200134
Citation: DUAN J T,ZHANG K,XU J,et al. Experimental investigation on flow mechanism driving heat transfer enhancement in a channel with circular pin fins[J]. Journal of Experiments in Fluid Mechanics, 2021,35(4):10-18. doi: 10.11729/syltlx20200134

圆形肋柱通道强化换热流动机理实验研究

doi: 10.11729/syltlx20200134
基金项目: 陕西省自然科学基金(2019JM-382)
详细信息
    作者简介:

    段敬添:(1996-),男,河南洛阳人,博士研究生。研究方向:先进冷却技术,实验流体力学。通信地址:陕西省西安市碑林区咸宁西路28号西安交通大学兴庆校区(710049)。E-mail:djt122196@stu.xjtu.edu.cn

    通讯作者:

    E-mail:kezhang@mail.xjtu.edu.cn

  • 中图分类号: V231.1

Experimental investigation on flow mechanism driving heat transfer enhancement in a channel with circular pin fins

  • 摘要: 圆形肋柱广泛应用于涡轮叶片内部尾缘强化换热通道。针对圆形肋柱通道强化换热流动机理开展了实验研究,利用PIV技术得到相同雷诺数Re(1.0×104或2.0×104)下通道中心面的流场分布,并与稳态液晶测温实验得到的通道端壁努塞尔数Nu分布进行对比。结果表明:对于圆形肋柱通道,肋柱下游尾迹区后横向速度脉动强度分布和端壁Nu分布相似,而流动充分发展后,小尺度脉动增强,湍流动能(Turbulent Kinetic Energy,TKE)和Nu的分布都非常均匀;随着Re的增大,横向速度脉动强度和端壁传热强化都明显下降,说明圆形肋柱下游涡脱落带来的强烈横向速度脉动是当地换热增强的主要原因,而其下游小尺度的速度脉动会使局部换热更加均匀。
  • 图  1  流动实验设备和PIV布置说明图

    Figure  1.  Illustration of flow facility and PIV setup

    图  2  测量区域圆柱阵列排布和尺寸说明示意图

    Figure  2.  Orientation and dimension of pin fin array in the measurement domain

    图  3  Re =1×104时端壁Nu分布与测量平面内速度场统计量对比

    Figure  3.  Comparison between Nusselt number distribution on the end wall and velocity field statistics in the measured plane for Re =1×104

    图  4  NuKtvrmsx/D =6.0处沿y方向的变化曲线

    Figure  4.  Variation of Nu, Kt and vrms along y at x/D =6.0

    图  5  NuvrmsNuKt对应的相关系数曲线

    Figure  5.  The corresponding correlation coefficient between Nu and vrms, Nu and Kt

    图  6  NuKtvrmsx/D =7.5处沿y方向的变化曲线

    Figure  6.  Variation of Nu, Kt and vrms along y at x/D =7.5

    图  7  Re =1×104时,第一排肋柱下游局部瞬时涡量分布

    Figure  7.  Local instantaneous vorticity distribution with velocity vectors downstream of the 1st row for Re =1×104

    图  8  Re =1×104时,x/D =2.0、y/D =3.0处的横向速度时间轨迹

    Figure  8.  Time trace of the cross-stream velocity at x/D =2.0 and y/D =3.0 for Re =1×104

    图  9  Re =1×104时,x/D =2.0、y/D =3.0处的脉动能量频谱

    Figure  9.  Power spectrum of the cross-stream velocity at x/D =2.0 and y/D =3.0 for Re =1×104

    图  10  Re =1×104时,第二排肋柱下游局部瞬时涡量分布

    Figure  10.  Local instantaneous vorticity distribution with velocity vectors downstream of the 2nd row for Re =1×104

    图  11  Re =1×104时,x/D =7.5、y/D =2.0处的横向速度时间轨迹

    Figure  11.  Time trace of the cross-stream velocity at x/D =7.5 and y/D =2.0 for Re =1×104

    图  12  Re =1×104时,x/D =7.5、y/D =2.0处的能量频谱

    Figure  12.  Power spectrum of the cross-stream velocity at x/D =7.5 and y/D =2.0 for Re =1×104

    图  13  Re =2×104时测量平面内的Nu, vrmsKt分布

    Figure  13.  The distributions of Nu, vrms and Kt in the measuring plane for Re =2×104

    图  14  Re =2×104时,第一排肋柱下游局部瞬时涡量分布

    Figure  14.  Local instantaneous vorticity distribution with velocity vectors downstream of the 1st row for Re =2×104

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出版历程
  • 收稿日期:  2020-11-02
  • 修回日期:  2020-12-10
  • 网络出版日期:  2021-08-25
  • 刊出日期:  2021-08-31

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