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Research Papers: Techniques and Procedures

Wind Tunnel Experiment of Bluff Body Aerodynamic Models Using a New Type of Magnetic Suspension and Balance System

[+] Author and Article Information
Y. Kawamura

e-mail: kawamura@fit.ac.jp

T. Mizota

Department of Intelligent Mechanical Engineering,
Faculty of Engineering,
Fukuoka Institute of Technology,
3-30-1, Wajirohigashi,
Higashiku Fukuoka, 811-0295, Japan

Contributed by the Fluids Engineering Division of ASME for publication in the Journal of Fluids Engineering. Manuscript received June 19, 2011; final manuscript received June 11, 2013; published online August 6, 2013. Assoc. Editor: Peter Vorobieff.

J. Fluids Eng 135(10), 101401 (Aug 06, 2013) (5 pages) Paper No: FE-11-1254; doi: 10.1115/1.4024793 History: Received June 19, 2011; Revised June 11, 2013

We have measured drag coefficients of a sphere and a circular cylindrical aerodynamic model using a five axes and a six axes control magnetic suspension and balance system (MSBS) developed by us. This MSBS has the characteristics of large aperture relative to the weight, light weight, and small electric power consumption in comparison with the conventional ones. We had good agreements between the measured values of the drag coefficient and the values appearing in the common aerodynamic handbook or textbook. We also succeeded in measuring the aerodynamic influence of a supporting rod of the aerodynamic models making use of the characteristics of the MSBS. Conventionally, the MSBS can be used only in large scale laboratories because the size, weight, and electric power consumption are large. We think that successful measurements of various aerodynamic characteristics using this type of MSBS will stimulate the introduction of it into the wind tunnel experiments in small scale laboratories.

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Figures

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Fig. 1

Experimental system of the five axes MSBS

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Fig. 2

Five axes MSBS set at the test section of a wind tunnel

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Fig. 3

Levitation of a sphere model having a diameter of 70 mm in the five axes MSBS

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Fig. 4

Coil current for y axes as a function of the wind velocity in the measurement of the drag coefficient of the sphere aerodynamic model using the five axes MSBA

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Fig. 5

Drag coefficients of the sphere model as a function of Reynolds number measured by the five axes MSBS. (Solid squares: experimental results by the MSBS, open squares: data from JSME handbook [10].)

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Fig. 6

Pseudo supporting rod and the levitated sphere model. There is a short gap between the end of the rod and the sphere model.

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Fig. 7

Drag coefficients of a sphere model levitated by the MSBS with and without the pseudo supporting rod as a function of the Reynolds number. (Solid squares: without pseudo support bar, open squares: with pseudo supporting rod.)

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Fig. 8

Experimental system of the six axes MSBS

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Fig. 9

Levitation of a cylindrical model with a diameter of 70 mm and a length of 140 mm in the five axes MSBS

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Fig. 10

Drag of the cylindrical model to the y direction measured by the six axes MSBS as a function of the wind velocity

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Fig. 11

Drag coefficients of the cylindrical model as a function of Reynolds number measured by the six axis MSBS. Error bars represent the standard deviation of five data. Dashed line is the drag coefficient of the cylinder having the same ratio for Reynolds numbers >104 [11].

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