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横向射流动态流场特征的高帧频实验研究

王震 王雅瑶 刘训臣

王震,王雅瑶,刘训臣. 横向射流动态流场特征的高帧频实验研究[J]. 实验流体力学,2022,36(X):1-14 doi: 10.11729/syltlx20210077
引用本文: 王震,王雅瑶,刘训臣. 横向射流动态流场特征的高帧频实验研究[J]. 实验流体力学,2022,36(X):1-14 doi: 10.11729/syltlx20210077
WANG Z,WANG Y Y,LIU X C. Experimental study on high frame rate characteristics of dynamic flow field of jet in crossflow[J]. Journal of Experiments in Fluid Mechanics, 2022,36(X):1-14. doi: 10.11729/syltlx20210077
Citation: WANG Z,WANG Y Y,LIU X C. Experimental study on high frame rate characteristics of dynamic flow field of jet in crossflow[J]. Journal of Experiments in Fluid Mechanics, 2022,36(X):1-14. doi: 10.11729/syltlx20210077

横向射流动态流场特征的高帧频实验研究

doi: 10.11729/syltlx20210077
基金项目: 国家自然科学基金(52076137,91941301);上海市自然科学基金(21ZR1431300)
详细信息
    作者简介:

    王震:(1998—),男,河北石家庄人,硕士研究生。研究方向:激光燃烧诊断。通信地址:上海市闵行区东川路800号上海交通大学闵行校区机械与动力工程学院激光燃烧诊断实验室(200240)。E-mail:120020910140@sjtu.edu.cn

    通讯作者:

    E-mail:liuxunchen@sjtu.edu.cn

  • 中图分类号: V211.71;O358

Experimental study on high frame rate characteristics of dynamic flow field of jet in crossflow

  • 摘要: 横向射流流场中各种涡结构的运动对射流轨迹变化和标量混合有着决定性影响,但目前对输运过程中剪切层涡的高频动态特性的相关研究仍然缺乏。本文基于40 kHz高频粒子图像测速技术(Particle Image Velocimetry,PIV)和20 kHz激光诱导荧光(Acetone Planner Laser Induced Fluorescence,Acetone PLIF)研究了不同直径喷嘴在不同速度比下的横向射流高频动态流场特征和标量场浓度分布规律及湍流细微结构的形成、破碎过程。速度场和标量场的实验测量表明增大速度比对回流区的生长起促进作用;通过拟合得到了射流轨迹、速度分布及剪切层涡运动轨迹方程,射流速度沿轨迹呈指数型下降;剪切层涡强度与涡运动频率也呈下降趋势,且迎风侧剪切层涡运动频率略低于背风侧;随着射流速度增大,剪切层涡运动频率逐渐增大,斯特劳哈尔数降低。
  • 图  1  横向射流结构示意图[5]

    Figure  1.  Schematic illustration of the JICF[5]

    图  2  横向射流实验装置

    Figure  2.  The set-up of jet in crossflow

    图  3  高速激光诊断系统示意图以及测量时序

    Figure  3.  Schematic of high-speed laser diagnostic system and the time series

    图  4  r=6时5 mm喷嘴PIV瞬态图像

    Figure  4.  Instantaneous PIV images with 5 mm nozzle of r=6

    图  5  不同速度比、喷嘴直径5 mm下的射流平均速度、垂直与水平速度分量

    Figure  5.  Mean velocity, vertical velocity component and horizontal velocity component with 5 mm nozzle of different velocity ratios

    图  6  回流区面积与速度比的关系

    Figure  6.  The relationship between reverse flow region and the velocity ratio

    图  7  拟合曲线与轨迹方程

    Figure  7.  Fitting curves and trajectory equations

    图  8  轨迹拟合曲线

    Figure  8.  The trajectory fitting curves

    图  9  坐标系转化

    Figure  9.  Coordinate system conversion

    图  10  不同喷嘴直径下射流沿中心线与垂线方向的速度变化

    Figure  10.  The velocity profiles along the jet centerline and perpendi-cular to the jet centerline with different diameter nozzles

    图  11  瞬时涡量场和剪切层涡轨迹

    Figure  11.  Instantaneous vorticity field and the trajectory of shear layer vortex

    图  12  不同速度比下的剪切层涡平均强度与涡强度沿轨迹的定量演化

    Figure  12.  The average strength of the shear layer vortex and the quantitative evolutions of shear layer vortex strength along the trajectory with different velocity ratios

    图  13  不同速度比下的剪切层涡运动频率分布

    Figure  13.  The main frequency of the shear layer vortex with different velocity ratios

    图  14  不同速度比下的剪切层涡运动频率

    Figure  14.  The frequency of the shear layer vortex with different velocity ratios

    图  15  瞬态相对浓度场

    Figure  15.  Instantaneous relative concentration field

    图  16  射流中心线及垂线上的相对浓度变化

    Figure  16.  The relative concentration profiles along the jet centerline and perpendicular to the jet centerline

    图  17  剪切层涡结构及其发展过程

    Figure  17.  The structure and development processing of the shear layer vortex

    图  18  功率谱密度

    Figure  18.  Power spectral density

    图  19  剪切层涡特征频率与斯特劳哈尔数

    Figure  19.  The characteristic frequency of the shear layer vortex and Strouhal number

    表  1  实验工况

    Table  1.   Experimental cases

    测量方法Case喷嘴直径
    d /mm
    射流密度
    ρj /(kg·m–3
    射流速度
    vj /(m·s–1
    速度比
    r=vj /u
    主流速度
    u /(m·s–1
    主流密度
    ρ /(kg·m–3
    PIV 0~6 5 1.293 16.8 6~12 2.80~1.40 1.293
    7 4 1.293 25.0 6 4.20 1.293
    8 5 1.293 25.0 6 4.20 1.293
    9 6 1.293 25.0 6 4.20 1.293
    丙酮PLIF 10 4 1.662 2.0 0.82 2.44 1.293
    11 4 2.054 5.0 2.00 2.44 1.293
    12 4 1.665 10.0 4.10 2.44 1.293
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-08-02
  • 录用日期:  2021-11-09
  • 修回日期:  2021-09-29
  • 网络出版日期:  2022-04-29

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