Experimental study on the anisotropy in von Kármán swirling flow system

WANG Feng; ZHANG Yibao; XI Hengdong

doi:10.11729/syltlx20230159

Volume 38 Issue 4

Sep. 2024

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Journal of Experiments in Fluid Mechanics > 2024 > 38(4): 11-20. > DOI: 10.11729/syltlx20230159

WANG F, ZHANG Y B, XI H D. Experimental study on the anisotropy in von Kármán swirling flow system[J]. Journal of Experiments in Fluid Mechanics, 2024, 38(4): 11-20. DOI: 10.11729/syltlx20230159

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WANG F, ZHANG Y B, XI H D. Experimental study on the anisotropy in von Kármán swirling flow system[J]. Journal of Experiments in Fluid Mechanics, 2024, 38(4): 11-20. DOI: 10.11729/syltlx20230159

Citation:

WANG F, ZHANG Y B, XI H D. Experimental study on the anisotropy in von Kármán swirling flow system[J]. Journal of Experiments in Fluid Mechanics, 2024, 38(4): 11-20. DOI: 10.11729/syltlx20230159

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Experimental study on the anisotropy in von Kármán swirling flow system

WANG Feng^1,,
ZHANG Yibao^{1, 2},
XI Hengdong^{1, 3, ,}

1.
School of Aeronautics, Northwestern Polytechnical University, Xi'an　710072, China
2.
Center for Combustion Energy, Department of Energy and Power Engineering, Tsinghua University, Beijing　100084, China
3.
Institute of Extreme Mechanics, Northwestern Polytechnical University, Xi'an　710072, China

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Received Date: November 16, 2023
Revised Date: December 12, 2023
Accepted Date: December 18, 2023
Available Online: January 18, 2024

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Abstract

Abstract

The degree of anisotropy in the Von Kármán Swirling (VKS) flow system was experimentally investigated. The three-dimensional velocity near the center of VKS was measured by tomographic PIV and two methods were adopted to calculate the second order Velocity Structure Function (VSF2) in order to study the scale-by-scale anisotropy. It is found that the fluctuation velocity is highly homogeneous. However, the Root-Mean-Square (RMS) velocity in the vertical direction is one-third times smaller than that in the horizontal direction, which characterizes the large-scale anisotropy. This large-scale anisotropy has left its fingerprint on the small scales, which is reflected by the observation that the scale-space distribution of VSF2 is isotropic in the horizontal plane while it is not in the vertical plane. Besides, this anisotropy diminishes as scale decreases, consistent with the local isotropy assumption proposed by Kolmogorov. This experimental study provides new insights into turbulent flows.
- von Kármán swirling flow system,
- anisotropy,
- velocity structure function,
- Tomographic PIV(Tomo–PIV)

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