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PLIF研究腔室宽高比对十字型混合器流动与混合影响

杨欢 张巍 黎湘霖 李挺 阮略 李伟锋 刘海峰 王辅臣

杨欢,张巍,黎湘霖,等. PLIF研究腔室宽高比对十字型混合器流动与混合影响[J]. 实验流体力学,2022,36(X):1-9 doi: 10.11729/syltlx20220038
引用本文: 杨欢,张巍,黎湘霖,等. PLIF研究腔室宽高比对十字型混合器流动与混合影响[J]. 实验流体力学,2022,36(X):1-9 doi: 10.11729/syltlx20220038
YANG H,ZHANG W,LI X L,et al. PLIF investigation on effects of chamber aspect ratio on flow and mixing in cross-shaped mixers[J]. Journal of Experiments in Fluid Mechanics, 2022,36(X):1-9. doi: 10.11729/syltlx20220038
Citation: YANG H,ZHANG W,LI X L,et al. PLIF investigation on effects of chamber aspect ratio on flow and mixing in cross-shaped mixers[J]. Journal of Experiments in Fluid Mechanics, 2022,36(X):1-9. doi: 10.11729/syltlx20220038

PLIF研究腔室宽高比对十字型混合器流动与混合影响

doi: 10.11729/syltlx20220038
基金项目: 国家自然科学基金(U21B2088,21776072)
详细信息
    作者简介:

    杨欢:(1999—),男,重庆人。研究方向:流体力学。通信地址:上海市徐汇区梅陇路130号华东理工大学徐汇校区上海煤气化工程技术研究中心。E-mail:2224398688@qq.com

    通讯作者:

    E-mail:liweif@ecust.edu.cn

  • 中图分类号: TQ021.1

PLIF investigation on effects of chamber aspect ratio on flow and mixing in cross-shaped mixers

  • 摘要: 在10<Re<500时,采用平面激光诱导荧光技术(PLIF)研究了4种腔室宽高比rr=0.5、1.0、1.5和2.0)的十字型混合器内的流动与混合特征。结果表明:不同腔室宽高比的十字型混合器内均出现了分离流、稳态吞噬流、脉动流和非稳态吞噬流等4种流型。对于稳态吞噬流,r<1.0的腔室内流场由3个共旋涡主导,而r≥1.0的腔室内中心涡和卫星涡旋转方向相反。对于脉动流,在r>1.0的腔室内,中心涡周期性收缩和扩张,且整个腔室内流体脉动,而在r=0.5和1.0的腔室下游出现涡环脱落特征。对于非稳态吞噬流,r=1.0的腔室内发生了旋涡合并和破碎现象,而r=0.5的腔室内中心涡和一侧卫星涡发生周期性合并,未观察到涡破碎;对于r>1.0的腔室,腔室内中心涡经历增长、变形和破碎过程。基于时间平均离析强度(IOS)对腔室内流体混合效果进行了量化,并揭示了混合机制。腔室宽高比的增大,促使吞噬流和脉动流的临界雷诺数显著降低,导致低雷诺数下腔室内流体混合强化。
  • 图  1  PLIF实验流程图及十字型混合器结构示意图

    Figure  1.  Schematic diagram of the experimental system and geometry of cross-shaped mixer

    图  2  不同腔室宽高比的十字型混合器内y=0平面上的PLIF图片

    Figure  2.  Flow regimes in the cross-shaped mixer with various chamber aspect ratios

    图  3  十字型混合器的Rer流型相图

    Figure  3.  The Rer space map describing different flow regimes in cross-shaped mixers

    图  4  不同腔室宽高比的十字型混合器内不同xOy平面上的瞬时PLIF图片

    Figure  4.  Instantaneous PLIF images of several xOy planes in cross-shaped mixers for various chamber aspect ratios

    图  5  十字型混合器内稳态吞噬流型下平面z=0上的中心涡尺度随雷诺数的变化

    Figure  5.  Size of center vortex on plane z=0 for steady engulfment flows in cross-shaped mixers

    图  6  Re=125、r=2.0时十字型混合器内z=0平面上一个周期内不同时刻的PLIF图片

    Figure  6.  PLIF images on plane z/h=0 at various moments during a period in the cross-shaped mixer for Re=125 and r=2.0

    图  7  Re=125、r=2.0时十字型混合器内y=0平面上瞬时PLIF图片和区域(−0.25≤x/h≤0.25和−8.75≤z/h≤8.75)时空图

    Figure  7.  Instantaneous PLIF image on plane y=0 and spatiotemporal map on region (−0.25≤x/h≤0.25 and −8.75≤z/h≤8.75) in cross-shaped mixer for Re=125 and r=2.0

    图  8  不同腔室宽高比的十字型混合器内非稳态吞噬流型下z=0平面上一个周期内不同时刻的PILF图片

    Figure  8.  PILF images at different moments in a period of the unsteady engulfment flow in cross-shaped mixers for various chamber aspect ratios

    图  9  不同雷诺数和腔室宽高比时十字型混合器内脉动流和非稳态吞噬流的无量纲振荡频率

    Figure  9.  Normalized oscillation frequencies of the pulsation flow and unsteady engulfment flow in cross-shaped mixers for different Re and r

    图  10  不同雷诺数和腔室宽高比下十字型混合器内z/h=5平面上的时间平均离析强度

    Figure  10.  The intensity of segregation of plane z/h=5 in cross-shaped mixer for various Reynolds numbers and chamber aspect ratios

    表  1  十字型混合器结构参数

    Table  1.   Geometrical parameters of the cross-shaped mixer

    Mixer No.h/mmwi /mmw/mm
    I10005001000
    II100010001000
    III100015001000
    IV100020001000
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-05-05
  • 修回日期:  2022-07-24
  • 录用日期:  2022-09-27
  • 网络出版日期:  2022-11-03

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