开缝圆柱缝隙倾斜角对脱落涡的影响

刘志荣; 邹赫; 刘锦生; 鲍锋; 朱睿

doi:10.13700/j.bh.1001-5965.2016.0058

开缝圆柱缝隙倾斜角对脱落涡的影响

doi: 10.13700/j.bh.1001-5965.2016.0058

刘志荣¹,
邹赫¹,
刘锦生²,
鲍锋¹,
朱睿^1, ,

1.
厦门大学航空航天学院, 厦门 361005
2.
清华大学航天航空学院, 北京 100084

基金项目:

国家自然科学基金面上项目 11072206

福建省科学基金 2012J01023

详细信息

作者简介:
刘志荣, 男, 硕士, 工程师。主要研究方向:实验流体力学、流动控制

通讯作者:
朱睿, 男, 博士, 讲师, 硕士生导师。主要研究方向:实验流体力学、流动控制、民航安全。E-mail:zhurui@xmu.edu.cn

中图分类号: O357
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出版历程
- 收稿日期: 2016-01-18
- 录用日期: 2016-01-27
- 网络出版日期: 2017-01-20

Effect of angle of slit on shedding vortex of slotted circular cylinder

1.
School of Aeronautics and Astronautics, Xiamen University, Xiamen 361005, China
2.
School of Aeronautics Engineering, Tsinghua University, Beijing 100084, China

Funds:

The General Program of National Natural Science Foundation of China 11072206

Science Foundation of the Fujian Province, China 2012J01023

More Information

Corresponding author: E-mail:zhurui@xmu.edu.cn

摘要

摘要:
开缝圆柱绕流作为钝体绕流研究的分支，具备很强的应用前景，但是对其复杂的流动现象的物理本质的理解仍不完善。本文采用流动显示技术和粒子成像测速技术（PIV），探究缝隙对开缝圆柱流场结构的影响，在数据处理方面采用本征正交分解（POD）方法对开缝圆柱流场信息进行了重建。实验研究表明：在一定雷诺数范围内，开缝圆柱缝隙的存在从根本上改变了圆柱绕流近区尾流的结构；开缝圆柱脱落涡的脱落频率对开缝圆柱缝隙倾斜角具有一定的敏感性，随着缝隙倾斜角的增大其斯特劳哈尔数逐渐变大，对比发现开缝圆柱狭缝比（缝隙/直径）为0.15时较0.10的斯特劳哈尔数具有更强的稳定性。
- 开缝圆柱 /
- 脱落涡 /
- 粒子成像测速技术(PIV) /
- 本征正交分解(POD) /
- 斯特劳哈尔数
Abstract:
Vortex shedding from a circular cylinder with a slit which belongs to the unsteady flow of bluff bodies has very strong application prospects. However, it is still difficult to fully understand the complex flow phenomenon. Using flow visualization and particle image velocimetry (PIV) measurement, we explored the influence of a slit on the flow field structure. Adopting the method of proper orthogonal decomposition (POD), we reconstructed the flow field in the series of operations on PIV data. The experimental results show that the flow in the slit demonstrates periodic motion, and this oscillating vent-flow greatly alters the near wake flow features within a certain range of Reynolds number. Shedding vortex frequency of slotted cylinder has certain sensitivity with the angle of slit. The Strouhal number increases gradually with the increase of the angle, and the Strouhal number of slit ratio (slit/diameter) equals to 0.15 is more stable than that of slit ratio equals to 0.10.
- slotted circular cylinder /
- shedding vortex /
- particle image velocimetry (PIV) /
- proper orthogonal decomposition (POD) /
- Strouhal number

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图 1 实验水槽

Figure 1. Experiment water channel

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图 2 实验模型

Figure 2. Experimental model

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图 3 实验模型及激光切面安装位置

Figure 3. Mounting position of experimental model andlaser section

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图 4 Re_d=5 837时缝隙内部流动

Figure 4. Fluid flow in slit-vent at Re_d=5 837

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图 5 PIV数据坐标系

Figure 5. Coordinate system of PIV data

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图 6 β=90°时不同Re_d下环量发展变化曲线

Figure 6. Circulation development curves at differentRe_d when β=90°

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图 7 β=90°时不同Re_d下的频谱图

Figure 7. Spectrogram at different Re_d when β=90°

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图 8 基准圆柱一个周期内的流态

Figure 8. Fluid flow of a base cylinder in a period

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图 9 s/d=0.10的开缝圆柱一个周期内的流态

Figure 9. Fluid flow of a slotted cylinder with s/d=0.10 in a period

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图 10 s/d=0.15的开缝圆柱一个周期内的流态

Figure 10. Fluid flow of a slotted cylinder with s/d=0.15 in a period

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图 11 开缝圆柱示意图

Figure 11. Sketch of circular cylinder with a slit

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图 12 St变化曲线在β=70°~90°

Figure 12. St development curves at β=70°-90°

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图 13 β=90°，85°，80°一个周期内的流态

Figure 13. Fluid flow of a slotted cylinder in a period at β=90°,85°，80°

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表 1 PIV系统参数

Table 1. PIV system parameters

组件	型号	参数及数值
激光		最大输出功率15 W，波长532 nm
相机	SpeedSense 9040	1 632像素×1 200像素
镜头	Micro-Nikkor	焦距55 mm
处理软件	Dynamic Studio V3.40
示踪粒子		PSP粒子直径20 μm

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表 2 开缝圆柱尺寸参数

Table 2. Geometrical parameters of slotted cylinder

参数	数值
d/mm	40
l/mm	440
d/l	11
s/mm	4，6
s/d	0.10，0.15
α/(°)	8.63
注：d/l为长宽比；α＝arcsin(s/d)为开缝角度。

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表 3 不同u下的Re_d、 f和St

Table 3. Re_d，f and St at different u

u/(m·s^-1)	0.035	0.070	0.100	0.145	0.180
Re_d	1 393	2 786	3 980	5 771	7 164
f/Hz	0.196	0.393	0.566	0.822	1.020
St	0.224	0.225	0.226	0.227	0.227

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