Experimental study on high frame rate characteristics of dynamic flow field of jet in crossflow
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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。Abstract: Despite the decisive influence of various vortex structures of a jet in crossflow on the jet trajectory and scalar mixing, there are few studies related to the high-frequency dynamic characteristics of shear-layer vortexes during transportation. This paper focuses on the high-frequency flow field characteristic, the scalar concentration distribution and the formation and collapse process of the turbulent microstructure of the jet in crossflow with different nozzle diameters and velocity ratios using 40 kHz particle image velocimetry（PIV） and 20 kHz acetone planar laser induced fluorescence（PLIF）. The experimental measurements of the velocity and scalar field show that: increasing the velocity ratio promotes the expansion of the circulation zone behind the jet; in the near field of the jet trajectory, power law fitted velocity distribution and shear-layer vortex trajectory shows an exponentially decrease of the jet velocity, the shear-layer vortex strength and vortex motion frequency also show a downward trend, with the frequency of the shear-layer vortex on the windward side slightly lower than that on the leeward side; as the jet velocity increases, the frequency of the shear-layer vortex increases gradually, but the Strouhal number decreases.
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Key words:
- jet in crossflow /
- PIV /
- acetone PLIF /
- shear layer vortex /
- flow field characteristic
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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 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 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 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 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 
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