Experimental determination of the aerodynamic coefficients of spinning bodies
File(s)Aerodynamics of spinning bodies.pdf (1.24 MB)
Accepted version
Author(s)
Nguyen, S
Corey, M
Chan, W
Greenhalgh, ES
Graham, JMR
Type
Journal Article
Abstract
To accurately predict the probabilities of impact damage to aircraft from runway debris, it is important to understand and quantify the aerodynamic forces that contribute to runway debris lofting. These lift and drag forces were therefore measured in experiments with various bodies spun over a range of angular velocities and Reynolds numbers. For a smooth sphere, the Magnus effect was observed for ratios of spin speed to flow speed between 0.3 and 0.4, but a negative Magnus force was observed at high Reynolds numbers as a transitional boundary layer region was approached. Similar relationships between lift and spin rate were found for both cube- and cylinder-shaped test objects, particularly with a ratio of spin speed to flow speed above 0.3, which suggested comparable separation patterns between rapidly spinning cubes and cylinders. A tumbling smooth ellipsoid had aerodynamic characteristics similar to that of a smooth sphere at a high spin rate. Surface roughness in the form of attached sandpaper increased the average lift on the cylinder by 24%, and approximately doubled the lift acting on the ellipsoid in both rolling and tumbling configurations.
Date Issued
2019-05-01
Date Acceptance
2019-02-26
Citation
The Aeronautical Journal, 2019, 123 (1263), pp.678-705
ISSN
0001-9240
Publisher
Cambridge University Press
Start Page
678
End Page
705
Journal / Book Title
The Aeronautical Journal
Volume
123
Issue
1263
Copyright Statement
© Royal Aeronautical Society 2019. This paper has been accepted for publication and will appear in a revised form, subsequent to peer-review and/or editorial input by Cambridge University Press.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000474255300007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Technology
Engineering, Aerospace
Engineering
Aerodynamics
Magnus force
Spinning bodies
Lofted debris
RUNWAY DEBRIS
IMPACT THREAT
MAGNUS
TRAJECTORIES
SPHERE
BALL
Publication Status
Published
Date Publish Online
2019-04-29