固体颗粒对沟槽湍流边界层影响的实验研究

严冬; 孙姣; 高天达; 陈丕; 成雨霆; 陈文义

doi:10.6052/0459-1879-21-149

固体颗粒对沟槽湍流边界层影响的实验研究

doi: 10.6052/0459-1879-21-149

严冬^{*, †},
孙姣^{*, †, **},
高天达^{*, †},
陈丕^{*, †},
成雨霆^{*, †},
陈文义^{*, †,}

*.
河北工业大学过程装备与控制工程系, 天津 300130
†.
河北工业大学化工学院, 化工节能过程集成与资源利用国家地方联合工程实验室, 天津 300130
**.
天津大学机械工程学院力学系, 天津 300350

基金项目: 国家自然科学基金(11572357, 11602077), 河北省自然科学基金(A2021202009)资助项目

详细信息

作者简介:
陈文义, 教授, 主要研究方向: 实验流体力学. E-mail: cwy63@hebut.edu.cn

中图分类号: O357.5⁺2
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- 文章访问数: 358
- HTML全文浏览量: 93
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- 被引次数: 0
出版历程
- 收稿日期: 2021-04-13
- 录用日期: 2021-07-05
- 网络出版日期: 2021-07-06
- 刊出日期: 2021-08-18

EXPERIMENTAL STUDY ON THE EFFECT OF SOLID PARTICLES ON RIBLET-PLATE TURBULENT BOUNDARY LAYER

Yan Dong^{*, †},
Sun Jiao^{*, †, **},
Gao Tianda^{*, †},
Chen Pi^{*, †},
Cheng Yuting^{*, †},
Chen Wenyi^{*, †
,}

*.
Department of Process Equipment and Control Engineering, Hebei University of Technology, Tianjin 300130, China
†.
National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China
**.
Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300350, China

摘要

摘要: 本文采用粒子图像测速技术(particles image velocimetry, PIV)研究固体颗粒对放置在平板湍流边界层中的平壁和沟槽壁面减阻效果的影响. 实验对清水和加入粒径为155 μm聚苯乙烯颗粒的流法向二维速度场信息进行采集, 对不同工况下的平均速度剖面、雷诺应力和湍流度等统计量进行对比, 分析流体在边界层中的行为. 运用空间局部平均结构函数提取了不同工况湍流边界层喷射−扫掠行为的空间拓扑结构并进行比较. 结果发现, 在不同的壁面条件下, 粒子加入后的对数律区中无量纲速度均略大于清水组, 雷诺切应力有所降低, 湍流度有所减弱. 对于不同流场速度下的沟槽而言, 颗粒的加入均降低了壁面附近的阻力, 而颗粒单独作用于光滑壁面的减阻效果并不明显. 加入粒子后的相干结构数目有所增加, 法向脉动速度下降. 沟槽壁面附近的相干结构数目有所增加, 法向脉动速度在自由来流速度较大时有所上升, 在速度较小时有所下降. 这表明不同减阻状况下的沟槽均能将大涡破碎成更多的涡, 并且粒子的加入强化了这种破碎作用.
- 沟槽壁面 /
- 两相流 /
- 粒子图像测速 /
- 湍流边界层 /
- 相干结构
Abstract: The particle image velocimetry (PIV) is used to conduct experimental research in the solid-liquid two-phase wall turbulent boundary layer in smooth and riblet surface. The streamwise-normal two-dimensional velocity field information of clean water (as single phase) and water with polystyrene particles which diameter is 155 μm was collected, and the turbulence statistics such as the average velocity profile, turbulence intensity and Reynolds shear stress of the smooth and riblet surface are compared in particle phase and clean water to analyze the behavior of fluid in different wall boundary layers. Coherent structures were detected by quadrant splitting method and the concept of local average velocity structure functions of the streamwise is utilized to extract the sweep and eject motions under different operating conditions. Under the different wall conditions, the dimensionless fluid velocity with particles was greater than that of clean water, the Reynolds stress in the logarithmic law region is decreased and the turbulence intensity is receded. The addition of particles reduces the drag reduction near the riblet surface with different velocities, but the drag reduction effect of particles acting on smooth wall surface is not obvious. The number of coherent structures is increased with the addition of particles and the normal fluctuating velocity is decreased. The number of coherent structures is increased near the riblet surface, the normal fluctuating velocity is increased in a higher free flow velocity and the normal fluctuating velocity is decreased in a lower free flow velocity. This indicates that the large vortices can be broken into more vortices under different drag reduction conditions, and this effect is increased by the addition of particles.
- riblet /
- two-phase flow /
- PIV /
- turbulent boundary layer /
- coherent structure

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图 1 实验装置示意图

Figure 1. Schematic diagram of the experimental facility

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图 2 沟槽板示意图(单位: mm)

Figure 2. Schemetic diagram of riblet plate (unit: mm)

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图 3 不同来流速度下流向平均速度剖面

Figure 3. Streamwise mean velocity profiles at different velocity

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图 4 不同来流速度下湍流度分布曲线

Figure 4. Distribution of the turbulence intensity at different velocity

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图 5 不同来流速度下雷诺切应力分布曲线

Figure 5. Distribution of the Reynolds shear stress at different velocity

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6 U_∞ = 0.205 m/s时不同工况下的喷射法向脉动速度云图

6. Contours of the normal fluctuating velocity around eject at U_∞ = 0.205 m/s

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图 6 U_∞ = 0.205 m/s时不同工况下的喷射法向脉动速度云图(续)

Figure 6. Contours of the normal fluctuating velocity around eject at U_∞ = 0.205 m/s (continued)

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图 7 U_∞ = 0.280 m/s时不同工况下的喷射法向脉动速度云图

Figure 7. Contours of the normal fluctuating velocity around eject at U_∞ = 0.205 m/s

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图 8 U_∞ = 0.205 m/s时不同工况下的扫掠法向脉动速度云图

Figure 8. Contours of the normal fluctuating velocity around eject at U_∞ = 0.205 m/s

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图 9 U_∞ = 0.280 m/s时不同工况下的喷射法向脉动速度云图

Figure 9. Contours of the normal fluctuating velocity around eject at U_∞ = 0.280 m/s

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图 10 不同来流速度下扫掠数目沿法向分布规律

Figure 10. Distributions of the number of sweep along normal-wall positions

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表 1 不同工况下的减阻效果对比

Table 1. Drag reduction under different working condition

	U_∞/(m·s⁻¹)	u*/(m·s⁻¹)	DR/%	DR*/%
clean water smooth wall	0.205	0.0088	−	−
clean water riblet wall	0.205	0.0084	8.88	8.88
particles smooth wall	0.205	0.0086	−	4.49
particles riblet wall	0.205	0.0081	11.28	15.31
clean water smooth wall	0.280	0.0115	−	−
clean water riblet wall	0.280	0.0117	−3.51	−3.51
particles smooth wall	0.280	0.0115	−	0
particles riblet wall	0.280	0.0112	5.43	5.43

下载: 导出CSV

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