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The study of a bi-stable wake region of a generic squareback vehicle using tomographic PIV

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posted on 08.06.2016 by Anna Perry, Mathew Almond, Martin Passmore, Rob Littlewood
This paper demonstrates the use of large scale tomographic PIV to study the wake region of a Windsor model. This forms part of a larger study intending to understand the mechanisms that drive drag force changes when rear end optimizations are applied. For the first time, tomographic PIV has been applied to a large airflow volume (0.125m3, 500 x 500 x 500mm), which is of sufficient size to capture the near wake of a 25% scale Windsor model in a single measurement. The measurement volume is illuminated using a 200mJ double pulsed Nd:Yag laser fitted with a volume optic and seeded with 300μm helium filled soap bubbles generated by a novel high output seeder. Images were captured using four 4M Pixel LaVision cameras. The tomographic results are shown to produce high quality data with the setup used, but further improvements and tests at higher Reynolds number could be conducted if an additional seeding rake was used to increase seeding density. Proper Orthogonal Decomposition (POD) was applied to both the 2D and tomographic data to show the presence of a bi-stable wake structure

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

SAE International Journal of Passenger Cars - Mechanical Systems

Volume

9

Issue

2

Citation

PERRY, A.K. ... et al, 2016. The study of a bi-stable wake region of a generic squareback vehicle using tomographic PIV. SAE International Journal of Passenger Cars - Mechanical Systems, 9 (2), doi: 10.4271/2016-01-1610

Publisher

© SAE International

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

01/01/2016

Publication date

2016

Notes

This paper was published in the journal SAE International Journal of Passenger Cars - Mechanical Systems and the definitive published version is available at http://dx.doi.org/10.4271/2016-01-1610

ISSN

1946-4002

Book series

SAE Technical Paper; 2016-01-1610

Language

en

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