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Experimental verification of an Oseen flow slender body theory

Published online by Cambridge University Press:  25 May 2010

E. CHADWICK ,
H. M. KHAN ,
M. MOATAMEDI ,
M. MAPPIN  and
M. PENNEY
E. CHADWICK*
Affiliation:
School of Computing, Science and Engineering, University of Salford, Salford M5 4WT, UK
H. M. KHAN
Affiliation:
School of Computing, Science and Engineering, University of Salford, Salford M5 4WT, UK
M. MOATAMEDI
Affiliation:
Narvik University College, Lodve Langes Gate 2, Narvik, N-8505Norway
M. MAPPIN
Affiliation:
School of Computing, Science and Engineering, University of Salford, Salford M5 4WT, UK
M. PENNEY
Affiliation:
School of Computing, Science and Engineering, University of Salford, Salford M5 4WT, UK
*
†Email address for correspondence: e.a.chadwick@salford.ac.uk
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Abstract

Consider uniform flow past four slender bodies with elliptical cross-section of constant ellipticity along the length of 0, 0.125, 0.25 and 0.375, respectively, for each body. Here, ellipticity is defined as the ratio of the semiminor axis of the ellipse to the semimajor axis. The bodies have a pointed nose which gradually increases in cross-section with a radius of curvature 419 mm to a mid-section which then remains constant up to a blunt end section with semimajor axis diameter 160 mm, the total length of all bodies being 800 mm. The bodies are side-mounted within a low-speed wind tunnel with an operational wind speed of the order 30 m s−1. The side force (or lift) is measured within an angle of attack range of −3° to 3° such that the body is rotated about the major axis of the ellipse cross-section. The lift slope is determined for each body, and how it varies with ellipticity. It is found that this variance follows a straight line which steadily increases with increasing ellipticity. It is shown that this result is predicted by a recently developed Oseen flow slender body theory, and cannot be predicted by either inviscid flow slender body theory or viscous crossflow theories based upon the Allen and Perkins method.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 654 , 10 July 2010 , pp. 271 - 279
Copyright
Copyright © Cambridge University Press 2010

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Footnotes

‡

H. M. Khan is also a permanent faculty member at College of Aeronautical Engineering, National University of Sciences and Technology (NUST), Pakistan

References

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