Effect of fineness ratios of 0.75–2.0 on aerodynamic drag of freestream-aligned circular cylinders measured using a magnetic suspension and balance system

The drag coefficients of freestream-aligned circular cylinders of fineness ratios of 0.75–2.0 were investigated with a magnetic suspension and balance system (MSBS). The objective was to find the critical geometry, that is, the fineness ratio at which the drag coefficient becomes the local maximum w...

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Bibliographic Details
Published in:	Experiments in fluids Vol. 59; no. 5; pp. 1 - 12
Main Authors:	Nonomura, Taku, Sato, Keiichiro, Fukata, Keita, Nagaike, Hayato, Okuizumi, Hiroyuki, Konishi, Yasufumi, Asai, Keisuke, Sawada, Hideo
Format:	Journal Article
Language:	English
Published:	Berlin/Heidelberg Springer Berlin Heidelberg 01-05-2018 Springer Nature B.V
Subjects:	Aerodynamic drag Aerodynamics Base pressure Circular cylinders Computational fluid dynamics Cyclones Drag coefficients Engineering Engineering Fluid Dynamics Engineering Thermodynamics Fineness Fineness ratio Fluid flow Fluid- and Aerodynamics Heat and Mass Transfer Low turbulence Mathematical models Research Article Turbulence Two dimensional bodies Variation Wind tunnels
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Summary:	The drag coefficients of freestream-aligned circular cylinders of fineness ratios of 0.75–2.0 were investigated with a magnetic suspension and balance system (MSBS). The objective was to find the critical geometry, that is, the fineness ratio at which the drag coefficient becomes the local maximum within this ratio range. The experiments were conducted using the 1-m MSBS at the low turbulence wind tunnel at the Institute of Fluid Science, Tohoku University. The drag and base pressure coefficients of various cylinders were measured. The freestream velocity was varied to produce flows with Reynolds numbers ranging from 0.6 × 10 5 to 1.0 × 10 5 . The drag coefficient monotonically decreases as the fineness ratio increases and no critical geometry or local maximum of the drag coefficient is found in the range we investigated. The base pressure coefficient decreases as the fineness ratio increases. The temporal fluctuations of the base pressure of the models with fineness ratios of 0.75, 1.0, and 1.2 are approximately twice as large as that of the model with a ratio of 2.0. The relationship between the fineness ratio and the drag coefficient is similar to that between the fineness ratio and the base pressure coefficient, similar to the findings of previous studies of two-dimensional bodies.
ISSN:	0723-4864 1432-1114
DOI:	10.1007/s00348-018-2531-2