art%3A10.1007%2Fs00348-016-2260-3.pdf (8.48 MB)
Influence of short rear end tapers on the wake of a simplified square-back vehicle: wake topology and rear drag
journal contribution
posted on 2016-10-21, 14:16 authored by Anna Perry, Giancarlo Pavia, Martin PassmoreAs vehicle manufacturers work to reduce energy consumption of all types of vehicles, external vehicle aerodynamics has become increasingly important. Whilst production
vehicle shape optimisation methods are well developed, the need to make further advances requires deeper understanding of the highly three-dimensional flow around bluff bodies. In this paper, the wake flow of a generic bluff body, the Windsor body, based on a square-back car geometry, was investigated by means of balance measurements, surface pressure measurements and 2D particle image
velocimetry planes. Changes in the wake topology are triggered by the application of short tapers (4 % of the model length) to the top and bottom edges of the base, representing a shape optimisation that is realistic for many modern production vehicles. The base drag is calculated and correlated with the aerodynamic drag data. The results not only show the effectiveness of such small devices in modifying the time average topology of the wake but also shed some light on the effects produced by different levels of upwash and downwash on the bi-stable nature of the wake itself.
Funding
Jaguar Land Rover and the EPSRC.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
Published in
Experiments in FluidsVolume
57Issue
11Citation
PERRY, A.K., PAVIA, G. and PASSMORE, M.A., 2016. Influence of short rear end tapers on the wake of a simplified square-back vehicle: wake topology and rear drag. Experiments in Fluids, 57, 169, doi:10.1007/s00348-016-2260-3Publisher
Springer © The Author(s)Version
- VoR (Version of Record)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/Acceptance date
2016-10-04Publication date
2016-10-18Notes
This is an Open Access Article. It is published by Springer under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/ISSN
0723-4864eISSN
1432-1114Publisher version
Language
- en