Electro–magnetic control of shear flow over a cylinder for drag reduction and lift enhancement

doi:10.1088/1674-1056/22/10/104701

中国物理B ›› 2013, Vol. 22 ›› Issue (10): 104701-104701.doi: 10.1088/1674-1056/22/10/104701

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Electro–magnetic control of shear flow over a cylinder for drag reduction and lift enhancement

张辉, 范宝春, 陈志华, 陈帅, 李鸿志

Science and Technology on Transient Physics Laboratory, Nanjing University of Science and Technology, Nanjing 210094, China

收稿日期:2012-12-06 修回日期:2013-03-05 出版日期:2013-08-30 发布日期:2013-08-30
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11202102 and 11172140) and the Specialized Research Fund for Doctoral Program of High Education, China (Grant No. 20123219120050).

Electro–magnetic control of shear flow over a cylinder for drag reduction and lift enhancement

Zhang Hui (张辉), Fan Bao-Chun (范宝春), Chen Zhi-Hua (陈志华), Chen Shuai (陈帅), Li Hong-Zhi (李鸿志)

Science and Technology on Transient Physics Laboratory, Nanjing University of Science and Technology, Nanjing 210094, China

Received:2012-12-06 Revised:2013-03-05 Online:2013-08-30 Published:2013-08-30
Contact: Zhang Hui E-mail:zhanghui1902@hotmail.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11202102 and 11172140) and the Specialized Research Fund for Doctoral Program of High Education, China (Grant No. 20123219120050).

摘要/Abstract

摘要： In this paper, the electro-magnetic control of a cylinder wake in shear flow is investigated numerically. The effects of the shear rate and Lorentz force on the cylinder wake, the distribution of hydrodynamic force, and the drag/lift phase diagram are discussed in detail. It is revealed that Lorentz force can be classified into the field Lorentz force and the wall Lorentz force and they affect the drag and lift forces independently. The drag/lift phase diagram with a shape of “8” consists of two closed curves, which correspond to the halves of the shedding cycle dominated by the upper and lower vortices respectively. The free stream shear (K > 0) induces the diagram to move downward and leftward, so that the average lift force directs toward the downside. With the upper Lorentz force, the diagram moves downwards and to the right by the field Lorentz force, thus resulting in the drag increase and the lift reduction, whereas it moves upward and to the left by the wall Lorentz force, leading to the drag reduction and the lift increase. Finally the diagram is dominated by the wall Lorentz force, thus moving upward and leftward. Therefore the upper Lorentz force, which enhances the lift force, can be used to overcome the lift loss due to the free stream shear, which is also obtained in the experiment.

关键词: cylinder wake control, Lorentz force, shear flow, hydrodynamic force

Abstract: In this paper, the electro–magnetic control of a cylinder wake in shear flow is investigated numerically. The effects of the shear rate and Lorentz force on the cylinder wake, the distribution of hydrodynamic force, and the drag/lift phase diagram are discussed in detail. It is revealed that Lorentz force can be classified into the field Lorentz force and the wall Lorentz force and they affect the drag and lift forces independently. The drag/lift phase diagram with a shape of “8” consists of two closed curves, which correspond to the halves of the shedding cycle dominated by the upper and lower vortices respectively. The free stream shear (K > 0) induces the diagram to move downward and leftward, so that the average lift force directs toward the downside. With the upper Lorentz force, the diagram moves downwards and to the right by the field Lorentz force, thus resulting in the drag increase and the lift reduction, whereas it moves upward and to the left by the wall Lorentz force, leading to the drag reduction and the lift increase. Finally the diagram is dominated by the wall Lorentz force, thus moving upward and leftward. Therefore the upper Lorentz force, which enhances the lift force, can be used to overcome the lift loss due to the free stream shear, which is also obtained in the experiment.

Key words: cylinder wake control, Lorentz force, shear flow, hydrodynamic force

中图分类号: (Laminar boundary layers)

47.15.Cb

47.85.L- (Flow control)

张辉, 范宝春, 陈志华, 陈帅, 李鸿志. Electro–magnetic control of shear flow over a cylinder for drag reduction and lift enhancement[J]. 中国物理B, 2013, 22(10): 104701-104701.

Zhang Hui (张辉), Fan Bao-Chun (范宝春), Chen Zhi-Hua (陈志华), Chen Shuai (陈帅), Li Hong-Zhi (李鸿志). Electro–magnetic control of shear flow over a cylinder for drag reduction and lift enhancement[J]. Chin. Phys. B, 2013, 22(10): 104701-104701.

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Electro–magnetic control of shear flow over a cylinder for drag reduction and lift enhancement

Electro–magnetic control of shear flow over a cylinder for drag reduction and lift enhancement

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