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Generation of a Controlled Level of Turbulence in the Pininfarina Wind Tunnel for the Measurement of Unsteady Aerodynamics and Aeroacoustics
Technical Paper
2003-01-0430
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In 1995, in order to bring the wind tunnel simulation as close as possible to the road condition, Pininfarina integrated the “rolling road” with the balance system and provided a means to rotate the car wheels. That was certainly an important first step to improve the airflow simulation of a vehicle moving on the road. However, to reproduce real on-road flow conditions in the wind tunnel, it is necessary to do a second equally important step. That is, it is necessary to be able to reproduce turbulent flow conditions similar to what a vehicle usually experiences on the road. In fact, it is known from previous works that for most of the time, a road vehicle is moving in the presence of turbulent flows, generated either by some natural low-speed wind or by other vehicles moving upstream. These flow conditions are very different from the almost perfect low-turbulence flow that is typical of modern automotive wind tunnels. The resultant car flow field is different, for both aerodynamics and aeroacoustics.
In the first part, the paper reports on some considerations regarding turbulent flows that are statistically more interesting to reproduce in the wind tunnel. Then it describes the active system built in the full-scale wind tunnel to generate a controlled level of turbulence. Finally, it deals with the measuring techniques that are used to investigate these unsteady flows and presents a few examples of aerodynamic and aeroacoustic measurements carried out in the new flow condition.
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Citation
Cogotti, A., "Generation of a Controlled Level of Turbulence in the Pininfarina Wind Tunnel for the Measurement of Unsteady Aerodynamics and Aeroacoustics," SAE Technical Paper 2003-01-0430, 2003, https://doi.org/10.4271/2003-01-0430.Data Sets - Support Documents
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Also In
SAE 2003 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V112-6; Published: 2004-09-15
Number: V112-6; Published: 2004-09-15
References
- Vernacchia M. “Medium Class Vehicle with High Aerodynamic Efficiency” FISITA paper 905127 Torino May 1990
- Cogotti A. “Ground Effect Simulation for Full-Scale Cars in the Pininfarina Wind Tunnel” SAE paper 950996 , International SAE Congress Detroit February- March 1995
- Cogotti A. “A Parametric Study on the Ground Effect of a Simplified Car Model” SAE paper n. 980031 , Intl'SAE Congress Detroit February 1998
- Cogotti A. “Ground Effect of a Simplified Car Model in Side-Wind and Turbulent Flow” SAE paper n. 1999-01-0652 , Intl'SAE Congress Detroit March 1999
- Cogotti A. “Measurements Techniques in Vehicle Aerodynamics” International Short Course on Vehicle Aerodynamics Stuttgart February 1998
- Saunders J.W. Melbourne W.H. “Buffeting Effects of Upstream Buildings.” Proc. 5th Int. Wind Engineering Conf. on Wind Effects on Buildings and Structures Fort Collins, Colorado, Pergamon 1979
- Saunders J.W. Watkins S. Hoffmann, P.H. Buckley F.T. Jr “Comparison of On-Road and Wind-Tunnel Tests for Tractor-Trailer Aerodynamic Devices, and Fuel Savings Predictions.” SAE paper 850286 , SAE Congress Detroit Feb. 1985
- Watkins S. Toksoy S. Saunders J.W. “On the generation of tunnel turbulence for road vehicles” 11 th Australasian Fluid Mechanics Conference University of Tasmania Hobart, Australia 14-18 Dec. 1992
- Saunders J.W. Watkins S “Atmospheric Effects on the Crosswind Stability of Cars” American SAE Information Monograph of the Crosswind Stability of Cars Goetz H. SAE SP-1109 1993
- Watkins A. Toksoy S. Saunders J.W. “Simulation of Turbulence for Road Vehicles” Third AWES Workshop University of Brisbane 8-9 July 1993
- Watkins S. Saunders J.W. Hoffmann, P.H. “Measurements of Turbulence Experienced by Moving Vehicles, Part 1, Turbulence Intensity” J. Wind Eng. & Ind. Aero. 57 1995 1 17
- Watkins S. Saunders J.W. “Turbulence Experience by Road Vehicles under Normal Driving Conditions” SAE Paper 950997 1995
- Saunders J.W. “The Importance of Simulating Turbulence in the Vehicle-Aerodynamics Wind Tunnel, Particularly for Simulation of Aero-Acoustic Noise,” Sub-Sonic Aeronautical Association Conference Haifa July 1996
- Saunders J. W. Watkins S. Melbourne, W. H. “Monash/RMIT Vehicle Aero-acoustic Wind Tunnel: Turbulence for Car Aerodynamics Testing” Proceedings Ninth International Pacific Conference on Automotive Engineering Indonesia SAE 971401 223 228 Nov. 1997
- Nguyen T.M. Saunders J.W. Watkins, S “The Sideways Dynamic Force on Passenger Cars in Turbulent Winds” “Topics in Vehicle Aerodynamics” 1-56091-944-2 SAE 157 172 1997
- Peric C. Watkins S. Lindqvist Elizabeth Saunders J.W. “Effects of On-Road Turbulence on Automotive Wind Noise: Comparing Wind-Tunnel and On-Road Tests” “Topics in Vehicle Aerodynamics” 1-56091-994-2 SAE 173 179 1997
- Watkins S. Saunders J.W. “A Review of the Wind Conditions Experienced by a Moving Vehicle” SAE Paper 981182 1998
- Mousley P.D. Watkins S. “A Method of Flow Measurement About Full-Scale and Model-Scale Vehicles” SAE Paper 2000-01-0871 2000
- Saunders J.W. Mansour R.B. “On-Road and Wind Tunnel Turbulence and its Measurements Using a Four-Hole Dynamic Probe ahead of several Cars” SAE Paper 2000-01-0350 2000
- Saunders J.W. Mansour R.B. “Measurements of On-Road and Wind Tunnel Turbulence using a Flying Dynamic Probe ahead of Passenger Cars” Journal of Wind Engineering and Industrial Aerodynamics 16 September 2001
- Saunders, J.W. “Measurements of On-Road and Wind Tunnel Turbulence using a Saunders, J.W., “Low Turbulence in SAE-standard Vehicle Aerodynamic Wind Tunnels under predict Side-glass Pressures” Sub-Sonic Aeronautical Association Conference Seattle June 2001
- Gilhome B.G. Saunders J.W. Sheridan J “Time Averaged and Unsteady Near-Wake Analysis of cars” SAE paper 2001-01-1040 2001
- Gilhome B.G. Saunders J.W. “The Effect of Turbulence on Peak and Average Pressures on a Car Door” SAE paper 2002-01-0253 2002
- Saunders, J.W. “Car door seal lift off: determining appropriate static and dynamic stiffness using surface pressure in the wind tunnel and on road” Sub-Sonic Aeronautical Association Conference Melbourne August 2002
- Vino G. Watkins S. Mousley P “An Experimental Investigation of the Time-Averaged Wake of a Notchback Model Car in Isolation and Under the Influence of Upstream Turbulence” SAE paper 2003 SAE Congress
- Cooper K.R. “Requirements for the Wind Tunnel Simulation of the Turbulence Encountered by Surface Vehicles”
- Cooper K.R. “An Active Turbulence Generator for the Wind Tunnel Simulation of the Large-Scale Turbulence Required for Section-Model Bridge Testing”
- Cooper K.R. “A Universal Aerodynamic Signature for Automobile and Commercial Vehicle Passing”
- Cooper K.R. “The Wind Tunnel Simulation of Wind Turbulence for Surface Vehicle Testing” 8th Colloquium on Industrial Aerodynamics Aachen September 4-7 1989
- Howell J.P Everitt K.W. ‘Gust Response of a High Speed Train Model’ ASME Conference FED-7, Aerodynamics of Transportation Boston 1983
- Macklin A.R. Garry K.P. Howell J.P. ‘Assessing the Effects of Shear and Turbulence during the Dynamic Testing of the Crosswind Sensitivity of Road Vehicles’ SAE 970135 1997
- Howell J. “Real Environment for Vehicles on the Road” Euromotor 2000 FKFS Stuttgart
- Széchényi E. „Crosswind and its Simulation” Euromotor 2000 FKFS Stuttgart
- Hooper J.D. Musgrove A.R. “Reynolds Stress, Mean Velocity and Dynamic steady Pressure Measurements by a Four-Hole Pressure Probe” Experimental Thermal and Lewis Science 15 375 383 1997
- Cogotti A. “Flow-Field Surveys behind three Squareback Car Models Using a New Fourteen-Hole Probe” SAE paper 870243 , Intl' SAE Congress Detroit February 1987
- Cogotti A. “Flow-field surveys measurements and their interpretation” Progress in Vehicle Aerodynamics - Advanced Experimental Techniques, Euromotor 2000 FKFS Stuttgart
- Cogotti A. “Aeroacoustics Development at Pininfarina” SAE paper 970402 , International SAE Congress Detroit February 1997
- Wagner A. Widdecke N. Wiedemann J “Crosswind Behavior of Driver and Vehicle” ECARA - Third Unsteady Aerodynamics W.G. Meeting March 2001
- Sims-Williams D.B. Dominy R.G. Howell J.P. “An Investigation into Large Scale Unsteady Structures in the Wake of Real and Idealized Hatchback Car Models” SAE paper 2001-01-1041 2001
- Takagi M. “Unsteady Multi-channel Pressure Measurement of Train Wakes” SATA Congress Monash University Melbourne August 13-16 2002
- Cogotti A. De Gregorio F. “Presentation of Flow Field Investigation by PIV on a Full-Scale Car in the Pininfarina Wind Tunnel” SAE paper 2000-01-0870 2000