雷诺数对不同展弦比下长平板绕流湍流特性影响的实验研究

刘宇陆; 刘欣; 丁旭; 李家骅

doi:10.3969/j.issn.2096-3424.2024.01.014

雷诺数对不同展弦比下长平板绕流湍流特性影响的实验研究

doi: 10.3969/j.issn.2096-3424.2024.01.014

刘宇陆^1,,
刘欣²,
丁旭¹,
李家骅^3, ,

1.
上海应用技术大学 a机械工程学院；b.理学院；c.城市建设与安全工程学院，上海 201418
2.
机械工程学院理学院
3.
城市建设与安全工程学院, 上海 201418

基金项目: 国家自然科学基金项目（12032016，12372277）资助

详细信息

作者简介:
刘宇陆（1959-），男，教授，博士，主要研究方向为湍流的理论与应用研究、环境流体力学等。E-mail: ylliu@sit.edu.cn

通讯作者:
李家骅(1982-),男,高级实验师,博士,主要研究方向为实验流体力学及应用等。E-mail：lijiahua@sit.edu.cn

中图分类号: O351.2
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出版历程
- 收稿日期: 2023-09-28
- 网络出版日期: 2024-01-26
- 刊出日期: 2024-03-30

An experimental study on the effect of Reynolds number on the turbulent characteristics of a rectangular cylinder with different aspect ratio

LIU Yulu^1
,,
LIU Xin²,
DING Xu¹,
LI Jiahua^{3
, ,}

1.
School of Scienes
2.
School of Mechanical Engineering
3.
School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China

摘要

摘要: 利用粒子图像测速(PIV)实验研究了不同展弦比下，雷诺数对长平板绕流的影响。雷诺数为：Re=500、800、1000，平板板长L与厚度D的比值为L/D，L/D=3、6。实验结果表明，展弦比L/D=3时，流体从平板前缘分离后重新附着在平板尾缘处。展弦比L/D=3和6时，平板上方再附着长度及平板后的回流区长度会随着雷诺数的增大而增大，展弦比为6时，雷诺数对板上分离泡的影响较小。雷诺数和展弦比会影响流场的湍流特性。展弦比L/D=3时，雷诺数的增加会导致平板两侧的脉动强度增加，而板后的脉动强度减弱；随着展弦比L/D增加，流场的湍流脉动强度减小。同时随着雷诺数的增加，流场中的小尺度涡结构增加。
- 长平板绕流 /
- 涡脱落 /
- 粒子图像测速
Abstract: The particle image velocimetry (PIV) experiment was used to investigate the effect of Reynolds number on the flow around a long plate with different aspect ratio. The Reynolds number is Re=500, 800 and 1000, respectively, and the ratio of plate flow length L to thickness D is L/D =3 and 6. The experimental results showed that when the aspect ratio was L/D=3, the fluid was separated from the leading edge of the plate and then re-attached to the trailing edge of the rectangular cylinder. When the aspect ratio was L/D=3 and 6, the length of the separation bubble above the plate and the reflux zone behind the plate increased with the steady build up of Reynolds number, and when the aspect ratio was 6, the influence of Reynolds number on the separation of bubbles on the plate was relatively small. Reynolds number and aspect ratio affected the turbulence characteristics of the flow field. When the aspect ratio was L/D=3, an increase in Reynolds number would lead to an increase in the pulsation intensity on both sides of the plate, while the pulsation intensity behind the plate would decrease. In addition, the turbulence fluctuation intensity of the flow field would decrease with the increase of the aspect ratio. At the same time, the small-scale vortex structure in the flow field increased with the increase of Reynolds number.
- the flow around the rectangular cylinder /
- vortex shedding /
- particle image velocimetry(PIV)

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图 1 实验模型示意图和视场图

Figure 1. The schematic diagram of experimental model and view of PIV region

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图 2 Re=1000时，展弦比L/D=3和6的St数分布

Figure 2. The distribution of Strouhal number(St) when Reynolds number is 1000 and aspect ratio is L/D=3 and 6

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图 3 时均流线分布

Figure 3. The distributions of time-averaged streamline

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图 4 当L/D=3和6时，近壁区（y/D=0.58）的流向速度$ U/{U_\infty } $分布

Figure 4. The distribution of stream wise velocity at different positions along y/D=0.58 when aspect ratio is L/D=3 and 6

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图 5 平板上表面回流系数云图

Figure 5. Contours of reverse flow intermittency

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图 6 当L/D=3和6时，近壁区（y/D=0.58）的回流系数分布

Figure 6. The distribution of reverse flow intermittency along y/D=0.58 when aspect ratio is L/D=3 and 6

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图 7 时均涡量场

Figure 7. Time-averaged vorticity fields

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图 8 流向速度脉动强度云图

Figure 8. Contour plot of streamwise velocity fluctuation

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图 9 前50阶POD模态能量分布及累积能量

Figure 9. Percentage of the total energy contributed by the first 50 POD modes and the corresponding cumulative energy

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图 10 前两阶模态分布

Figure 10. The distribution of the first two POD modes

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图 11 当Re=1000，L/D=3时的相位平均λ_ci场和流线的分布

Figure 11. Phase mean λ_ci field and corresponding streamlines when Reynolds number is 1000 and aspect ratio is L/D=3

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图 12 当Re=1000，L/D=6时的相位平均λ_ci场和流线的分布

Figure 12. Phase mean λ_ci field and corresponding streamlines when Reynolds number is 1000 and aspect ratio is L/D=6

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参考文献(22)

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雷诺数对不同展弦比下长平板绕流湍流特性影响的实验研究

doi: 10.3969/j.issn.2096-3424.2024.01.014

作者简介:
刘宇陆（1959-），男，教授，博士，主要研究方向为湍流的理论与应用研究、环境流体力学等。E-mail: ylliu@sit.edu.cn

通讯作者:
李家骅(1982-),男,高级实验师,博士,主要研究方向为实验流体力学及应用等。E-mail：lijiahua@sit.edu.cn

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An experimental study on the effect of Reynolds number on the turbulent characteristics of a rectangular cylinder with different aspect ratio

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雷诺数对不同展弦比下长平板绕流湍流特性影响的实验研究

doi: 10.3969/j.issn.2096-3424.2024.01.014

作者简介: 刘宇陆（1959-），男，教授，博士，主要研究方向为湍流的理论与应用研究、环境流体力学等。E-mail: ylliu@sit.edu.cn

通讯作者: 李家骅(1982-),男,高级实验师,博士,主要研究方向为实验流体力学及应用等。E-mail：lijiahua@sit.edu.cn

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出版历程

An experimental study on the effect of Reynolds number on the turbulent characteristics of a rectangular cylinder with different aspect ratio

计量

出版历程

目录

最新资讯更多>

友情链接更多>

作者简介:
刘宇陆（1959-），男，教授，博士，主要研究方向为湍流的理论与应用研究、环境流体力学等。E-mail: ylliu@sit.edu.cn

通讯作者:
李家骅(1982-),男,高级实验师,博士,主要研究方向为实验流体力学及应用等。E-mail：lijiahua@sit.edu.cn