repository 2013-01-0463.pdf (2.52 MB)
The impact of underbody roughness on rear wake structure of a squareback vehicle
conference contribution
posted on 2016-09-30, 12:35 authored by Anna Perry, Martin PassmoreIn this paper the effects of a rough underbody on the rear wake structure of a simplified squareback model (the Windsor model) is investigated using balance measurements, base pressure measurements and two and three component planar PIV. The work forms part of a larger study to develop understanding of the mechanisms that influence overall base pressure and hence the resulting aerodynamic drag. In the work reported in this paper the impact of a rough underbody on the base pressure and wake flow structures is quantified at three different ground clearances. The underbody roughness has been created through the addition of five roughness strips to the underbody of the model and the effects on the wake at ground clearances of 10.3%, 17.3% and 24.2% of the model height are assessed. All work has been carried out in the Loughborough University Large Wind Tunnel with a scale model giving a blockage ratio of 4.4% for a smooth under-body or 4.5% with the maximum thickness roughness strips. The tests are conducted with a fixed ground plane. Results are presented for the base pressure distribution and these are compared against the stream-wise PIV results. This work demonstrates the need for rough underbody structures to be considered during base pressure investigations before any model scale work is conducted due to their influence on the wake structures. Copyright © 2013 SAE International.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
Published in
SAE Technical PapersVolume
2Citation
PERRY, A.K. and PASSMORE, M., 2013. The impact of underbody roughness on rear wake structure of a squareback vehicle. SAE Technical Paper 2013-01-0463, doi:10.4271/2013-01-0463.Publisher
© SAE InternationalVersion
- AM (Accepted Manuscript)
Publication date
2013Notes
This paper was presented at the SAE 2013 World Congress & Exhibition. Copyright © 2013 SAE International. This paper is posted on this site with permission from SAE International, and is for viewing only. Further use or distribution of this paper is not permitted without permission from SAE.ISSN
0148-7191Publisher version
Book series
SAE Technical Paper;2013-01-0463Language
- en