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Experimental and Numerical Investigations of the Base Wake on an SUV
Technical Paper
2013-01-0464
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
With the increase in fuel prices and the increasingly strict
environmental legislations regarding CO₂ emissions, reduction of
the total energy consumption of our society becomes more important.
Passenger vehicles are partly responsible for this consumption due
to their strong presence in the daily life of most people.
Therefore reducing the impact of cars on the environment can assist
in decreasing the overall energy consumption. Even though several
fields have an impact on a passenger car's performance, this
paper will focus on the aerodynamic part and more specifically, the
wake behind a vehicle.
By definition a car is a bluff body on which the air resistance
is for the most part driven by pressure drag. This is caused by the
wake these bodies create. Therefore analyzing the wake
characteristics behind a vehicle is crucial if one would like to
reduce drag. With the recent upgrade of wind tunnels with a moving
belt system, the opportunity has emerged to investigate the flow
field in the wake behind vehicles, matching closer the real on-road
driving conditions.
This study investigates experimentally and numerically the wake
behind a passenger car of an SUV type. Three configurations with a
significant change in CD have been chosen for the analysis. Their
wake shape together with their respective closure points have been
analyzed using three planes, namely one x-plane, one y-plane and
one z-plane.
Results have shown that the numerical simulations correlate well
with the experiments in wake shape and wake behavior. However in
the chosen configurations they underestimate the wake length. A
distinct interference of the traversing unit presence can be noted
in the experimental results.
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Authors
Topic
Citation
Sterken, L., Sebben, S., Walker, T., and Lofdahl, L., "Experimental and Numerical Investigations of the Base Wake on an SUV," SAE Technical Paper 2013-01-0464, 2013, https://doi.org/10.4271/2013-01-0464.Also In
References
- European Energy and Transport EU-25 Energy and transport outlook to 2030
- US Energy Information Administration http://www.eia.gov/forecasts/aeo/sector_transportation_all.cfm#uses 2012 10 17
- Eurostat, European Commission Energy statistics http://epp.eurostat.ec.europa.eu/portal/page/portal/energy/introduction 2012 10 17
- Hucho , W.-H. Aerodynamics of Road Vehicles Society of Automotive Engineers, Inc. Warrendale, PA 978-0-7680-0029-0
- Ahmed , S. , Ramm , G. , and Faltin , G. Some Salient Features Of The Time-Averaged Ground Vehicle Wake SAE Technical Paper 840300 1984 10.4271/840300
- Cogotti , A. Flow-Field Surveys Behind Three Squareback Car Models Using a New “Fourteen-Hole” Probe SAE Technical Paper 870243 1987 10.4271/870243
- Wäschle , A. Numerische und experimentelle Untursuchung des Einflusses von drehenden Rädern auf die Fahrzeugaerodynamik Expert Verlag Renningen, Germany 2006
- Landström , C. Passenger Car Wheel Aerodynamics Chalmers reproservice Gothenburg 2011
- Wiedemann , J. The Influence of Ground Simulation and Wheel Rotation on Aerodynamic Drag Optimization - Potential for Reducing Fuel Consumption SAE Technical Paper 960672 1996 10.4271/960672
- Sternéus , J. , Walker , T. , and Bender , T. Upgrade of the Volvo Cars Aerodynamic Wind Tunnel SAE Technical Paper 2007-01-1043 2007 10.4271/2007-01-1043
- Aeroprobe Online Omniprobe Documentation http://www.aeroprobe.com/uploads/Aeroprobe-Omniprobe-Information-2012.pdf 2012 10 17
- Mercker , E. , Cooper , K. , Fischer , O. , and Wiedemann , J. The Influence of a Horizontal Pressure Distribution on Aerodynamic Drag in Open and Closed Wind Tunnels SAE Technical Paper 2005-01-0867 2005 10.4271/2005-01-0867
- Sebben , S. and Mlinaric , P. Investigation of the Influence of Tyre Deflection and Tyre Contact Patch on CFD Predictions of Aerodynamic Forces on a Passenger Car 7th MIRA International Vehicle Aerodynamics Conference October 2008
- Cogotti , A. A Strategy for Optimum Surveys of Passenger-Car Flow Fields SAE Technical Paper 890374 1989 10.4271/890374
- Ivanic T. Gilliéron P. , Aerodynamic drag and ways to reduce it Lecture Series VKI Institute Brussels 2005
- Sterken L. Sebben S. Löfdahl L. , Alternative Approach in Ground Vehicle Wake Analysis WASET ICAME Oslo 2012