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On the Aerodynamics of an Enclosed-Wheel Racing Car: An Assessment and Proposal of Add-On Devices for a Fourth, High-Performance Configuration of the DrivAer Model
Technical Paper
2018-01-0725
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A modern benchmark for passenger cars - DrivAer model - has provided significant contributions to aerodynamics-related topics in automotive engineering, where three categories of passenger cars have been successfully represented. However, a reference model for high-performance car configurations has not been considered appropriately yet. Technical knowledge in motorsport is also restricted due to competitiveness in performance, reputation and commercial gains. The consequence is a shortage of open-access material to be used as technical references for either motorsport community or academic research purposes.
In this paper, a parametric assessment of race car aerodynamic devices are presented into four groups of studies. These are: (i) forebody strakes (dive planes), (ii) front bumper splitter, (iii) rear-end spoiler, and (iv) underbody diffuser. The simplified design of these add-ons focuses on the main parameters (such as length, position, or incidence), leading to easier manufacturing for experiments and implementation in computational studies. Consequently, a proposed model aims to address enclosed-wheel racing car categories, adapting a simplified, 35% scaled-model DrivAer Fastback shape (i.e. smooth underbody, no wheels, and with side mirrors).
Experimental data were obtained at the 8 ft x 6 ft Cranfield Wind Tunnel using an internal balance for force and moment measurements. The aerodynamic performance of each group of add-on was assessed individually in a range of ride heights over a moving belt. All cases represent the vehicle at a zero-yaw condition, Reynolds number (car length-based) of 4.2 × 106 and Mach number equal to 0.12. The proposed high-performance configuration (DrivAer hp-F) was tested and a respective Reynolds number dependency study is also provided.
In line with the open-access concept of the DrivAer model, the CAD geometry and experimental data will be made available online to the international community to support independent studies.
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Soares, R., Knowles, A., Goñalons Olives, S., Garry, K. et al., "On the Aerodynamics of an Enclosed-Wheel Racing Car: An Assessment and Proposal of Add-On Devices for a Fourth, High-Performance Configuration of the DrivAer Model," SAE Technical Paper 2018-01-0725, 2018, https://doi.org/10.4271/2018-01-0725.Data Sets - Support Documents
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References
- DTM website https://www.dtm.com/sites/default/ files/pflicht_teaser2.jpg 2017
- AutoGuide website NASCAR Drivers Transform the Toyota Camry http://www.autoguide.com/blog/wp-content/gallery/toyota-camry-2017-sema-show-official-gallery/toyota-camry-2017-sema-show-rutledge-11.jpg 2017
- Katz , J. Race Car Aerodynamics: Designing for Speed Second Cambridge Bentley Publishers 2006 9780837601427
- Singh , R. CFD Simulation of NASCAR Racing Car Aerodynamics SAE Technical Paper 2008-01-0659 2008 10.4271/2008-01-0659.
- Katz , J. and Cain , K.P. Rapid, Low-Cost, Aerodynamic Development of a High-Performance Sports Car SAE Technical Paper 2011-01-2821 2011 10.4271/2011-01-2821
- Garry , K. and Le Good , G. An Investigation of the Sensitivity of Rear Wing Orientation for Saloon Race Cars SAE Technical Paper 2005-01-1018 2005 10.4271/2005-01-1018.
- Hellman , S. et al. PIV Analysis Comparing Flow Past NASCAR COT Rear Wing and Spoiler Traveling Forward and Backwards SAE Technical Paper 2011-01-1432 2011 10.4271/2011-01-1432
- Le Good , G. et al. The Design of Systematic Add-on Configuration Changes for the DrivAer Body and their Aerodynamic Characteristics IMechE International Conference on Vehicle Aerodynamics Coventry 2016
- Cheng , S. and Mansor , S. Influence of Rear-Roof Spoiler on the Aerodynamic Performance of Hatchback Vehicle MATEC Web of Conferences 90 01027 2017 10.1051/matecconf/20179001027
- Ahmed , S.R. Influence of Base Slant on the Wake Structure and Drag of Road Vehicles Journal of Fluids Engineering 105 429 434 1983 10.1115/1.3241024.
- Fukuda , H. et al. Improvement of Vehicle Aerodynamics by Wake Control JSAE Review 16 2 151 155 1995 10.1016/0389-4304(95)00007-T
- Singh , R. and Golsch , K. A Downforce Optimization Study for a Racing Car Shape SAE Technical Paper 2005-01-0545 2005 10.4271/2005-01-0545
- Cooper , K.R. et al. The Aerodynamic Performance of Automotive Underbody Diffusers SAE Technical Paper 980030 1998 10.4271/980030
- Cooper , K.R. and Syms , J. Selecting Automotive Diffusers to Maximise Underbody Downforce SAE Technical Paper 2000-01-0354 2000 10.4271/2000-01-0354
- Zhang , X. , Toet W. and Zerihan J. Ground Effect Aerodynamics of Race Cars Applied Mechanics Reviews 59 1-6 33 48 2006 10.1115/1.2110263
- Hu , X. , Zhang R. , Ye J. , Yan X. et al. Influence of Different Diffuser Angle on Sedan's Aerodynamic Characteristics Physics Procedia 22 239 245 2011 10.1016/j.phpro.2011.11.038
- Jowsey , L. and Passmore , M. Experimental Study of Multiple-Channel Automotive Underbody Diffusers Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering. 224 7 865 879 2010 10.1243/09544070JAUTO1339
- Xingjun , H. et al. Design and Aerodynamic Assessment of Diffuser with Longitudinal Separators for Underbody of Sedan Applied Mechanics and Materials. 215-216 1033 1037 2012 10.4028/www.scientific.net/AMM.215-216.1033
- Heft , A. , Indinger , T. , and Adams , N. Introduction of a New Realistic Generic Car Model for Aerodynamic Investigations SAE Technical Paper 2012-01-0168 2012 10.4271/2012-01-0168
- Mack , S. , Indinger , T. , Adams , N. , Blume , S. et al. The Interior Design of a 40% Scaled DrivAer Body and First Experimental Results ASME 2012 8-12 Jul 2012 Puerto Rico, USA FEDSM2012-72371 10.1115/fedsm2012-72371
- Collin , C. , Mack , S. , Indinger , T. , and Mueller , J. A Numerical and Experimental Evaluation of Open Jet Wind Tunnel Interferences Using the DrivAer Reference Model SAE Int. J. Passeng. Cars - Mech. Syst. 9 2 657 679 2016 10.4271/2016-01-1597
- DrivAer Model Geometry http://www.aer.mw.tum.de/en/research-groups/automotive/ drivaer/geometry/
- Soares , R. F. Drag of Road Cars: Cost-Effective CFD Setup, Proposal of an Aerodynamic Concept and Case Studies Master Thesis, Universidade Federal de Uberlândia (UFU) Uberlândia 2015 10.13140/RG.2.1.3591.1765
- Soares , R. , Garry , K. , and Holt , J. Comparison of the Far-Field Aerodynamic Wake Development for three DrivAer Model Configurations Using a Cost-Effective RANS Simulation SAE Technical Paper 2017-01-1514 2017 10.4271/2017-01-1514.
- Aerotech A.T.E. Ltd. Specification 9304-1. General Specification of 3 or 6 Component Internal Strain Gauged Balances for Race Car Models Heathfield (E.Sussex)
- Howell , J. and Le Good , G. The Influence of Aerodynamic Lift on High Speed Stability SAE Technical Paper 1999-01-0651 1999 10.4271/1999-01-0651.
- Soares , R.F. et al. 2018 10.17862/cranfield.rd.c.3969120
- Soares , R.F. et al. 2018 10.17862/cranfield.rd.c.3969120