Passmore_21527_2016-01-1610.pdf (6.25 MB)
The study of a bi-stable wake region of a generic squareback vehicle using tomographic PIV
journal contribution
posted on 2016-06-08, 15:11 authored by Anna Perry, Mathew Almond, Martin Passmore, Rob LittlewoodThis 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 SystemsVolume
9Issue
2Citation
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: 10.4271/2016-01-1610Publisher
© SAE InternationalVersion
- 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
2016-01-01Publication date
2016Notes
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/10.4271/2016-01-1610ISSN
1946-4002Publisher version
Book series
SAE Technical Paper; 2016-01-1610Language
- en