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Experimental study on the effect of wall proximity on the flow around a cylinder under an axial magnetic field

Published online by Cambridge University Press:  25 November 2024

Ze-Dong Wang Open the ORCID record for Ze-Dong Wang [Opens in a new window] ,
Qi-Long Zhang ,
Yuri B. Kolesnikov ,
Ze Lyu ,
Juan-Cheng Yang ,
Ming-Jiu Ni Open the ORCID record for Ming-Jiu Ni [Opens in a new window]  and
Nian-Mei Zhang Open the ORCID record for Nian-Mei Zhang [Opens in a new window]
Ze-Dong Wang
Affiliation:
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 101408, PR China
Qi-Long Zhang
Affiliation:
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 101408, PR China
Yuri B. Kolesnikov
Affiliation:
Technische Universitat Ilmenau, PF 100565, 98684 Ilmenau, Germany
Ze Lyu
Affiliation:
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 101408, PR China
Juan-Cheng Yang
Affiliation:
State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, PR China
Ming-Jiu Ni
Affiliation:
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 101408, PR China
Nian-Mei Zhang*
Affiliation:
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 101408, PR China
*
† Email address for correspondence: [email protected]
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Abstract

Investigations are conducted on the effect of wall proximity on the flow around a cylinder under an axial magnetic field, using the electrical potential probe technology to measure the velocity of liquid metal flow. The study focused on the impact of the inlet velocity of the fluid, the magnetic field and wall proximity on the characteristics of velocity fields, particularly on the vortex-shedding mode. Based on different magnitudes of the magnetic field and the distance from the cylinder to the duct wall, three types of vortex-shedding modes are identified, (I) shear layer oscillation state, (II) quasi-two-dimensional vortex-shedding states and (III) transition of the magnetohydrodynamic to hydrodynamic Kármán street. The transitions between these modes are analysed in detail. The experimental results show that the weak wall-proximity effect leads to the formation of the Kármán vortex street, while a reverse Kármán vortex street and secondary vortices emerge under a strong wall-proximity effect. It is noticed that the Kelvin–Helmholtz instability drives vortex shedding under regime I, leading to an increase in the Strouhal number (St) with stronger magnetic fields. Additionally, under a strong axial magnetic field, the wall-proximity effect (‘Shercliff layer effect’) promotes the instability of shear layers on both sides of the cylinder. These unique coupling effects are validated by variations in modal coefficients and energy proportions under different vortex-shedding regimes using the proper orthogonal decomposition method.

JFM classification

Vortex Flows: Vortex shedding Vortex Flows: Vortex dynamics
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 1000 , 10 December 2024 , A23
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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