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Wake Studies of a Model Passenger Car Using PIV
Technical Paper
2002-01-3335
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Detailed wake surveys were performed with a 1/8th scale model, hatchback car in a low-speed, wind tunnel. The tests were conducted at a freestream velocity of 20m.s-1 giving a Reynolds number of 6.0 ×105 based on the model length. PIV was used to obtain cross-flow velocities at four wake survey locations. At one wake position the effect of hatchback geometry was investigated. Using a wake integration technique, lift and induced drag distributions along the model width, total lift and induced drag acting on the model were obtained using flow field data. The induced lift and drag coefficients were found to decrease downstream of the model due to viscous dissipation. A hatchback angle of 30° was found to produce the greatest induced drag. The instantaneous wake structure of hatchback cars was found to be asymmetric and was not adequately described as consisting of counter-rotating C-post vortices, a concept produced by earlier time averaged data obtained elsewhere.
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McCutcheon, G., McColgan, A., Grant, I., and Hurst, D., "Wake Studies of a Model Passenger Car Using PIV," SAE Technical Paper 2002-01-3335, 2002, https://doi.org/10.4271/2002-01-3335.Also In
References
- Drabble M.J. Grant I. Armstrong B. Barnes F.H. The aerodynamic admittance of a square plate in a flow with a fully coherent fluctuation Physics of Fluids A 2 6 1005 1013 1990
- Armstrong B.J. Barnes F.H. Drabble M.J. Grant I Unsteady aerodynamic loading of a tension leg platform, Proc Offshore Technology Conference Houston, Texas OTC 4641 1983
- Betz A. Ein Verfahren zur Direkten Ermittlung de Profilwiderstandes ZFM 16 42 44 1925
- Maskell E.C. Progress towards a method for the measurement of the components of the drag of a wing of finite span Technical Report 72232, Royal Aircraft Establishment 1973
- Wu J.C. Hackett J.E. Lilley D.E. A generalized wake-integral approach for drag determination in three-dimensional flows AIAA Paper 79-0279 Jan. 1979
- Hackett J.E. Williams J.E. Patrick J. Jr. Wake traverses behind production cars and their interpretation SAE, 850280 1985
- Ahmed S.R. Wake structure of typical automobile shapes Journal of Fluids Engineering 103 162 169 1979
- Bearman P.W. Davis J.P. Harvey J.K. Measurement of the structure of road vehicle wakes International Journal of Vehicle Design 493 500 1983
- Bearman P.W. Bluff body flows applicable to vehicle aerodynamics ASME, Aerodynamics of Transport June 1979
- McCutcheon G. McColgan A.H. Hurst D. Grant I. Measurement of aerodynamic forces in the wake of a road vehicle using wake integration and PIV techniques, paper 206 206.1 206.11 Proc. 9th Int. Symposium on Flow Visualization (ISBN 09533991 1 7) Heriot-Watt University Edinburgh August 22-25 2000
- McCutcheon G. McColgan A.H. Hurst D. Grant I. A study of a typical road vehicle wake using PIV and wake integration to predict aerodynamic loading Proceedings of PSFVIP-3 March 18-21 Maui, Hawaii, USA 2001
- McCutcheon G. McColgan A.H. Hurst D. Grant I. Wake studies of a model passenger car using PIV 3 rd MIRA International Vehicle Aerodynamics Conference 18-19 October Dunchurch Conference Centre, Rugby, UK 2000
- McCutcheon G. McColgan A.H. Percario S. Hurst D. Grant I. Error due to assuming constant through-sheet velocity when applying correction for the viewing angle to particle tracking velocimetry data obtained in the wake of a model car Journal of Visualization 3 4 357 367 2001
- Wang Q. Bearman P.W. Harvey J.K. A study of the instantaneous flow structure behind a car by particle image velocimetry Optical Methods and Data Processing in Heat and Fluid Flow IMechE Conference Transaction 1996-3 179 188 1996
- Hackett J.E. Baker J.B. Williams J.E. Wallis S.B. On the influence of ground movement and wheel rotation in tests on modern car shapes SAE, 870245 1987
- Beauvais F.N. Tignor S.C. Turner T.R. Problems of ground simulation in automotive aerodynamics Society of Automotive Engineers, Technical papers series 680121 1968
- Anderson J.D. Fundamentals of Aerodynamics Second McGraw-Hill, Inc. New York 1991
- Cummings R.M. Giles M.B. Shrinivas G.N. Analysis of the elements of drag in three-dimensional viscous and inviscid flows AIAA Journal 96 2482 1996
- Grant I. Pan X. Wang X. Stewart N. Correction for viewing angle applied to PIV data obtained in aerodynamic blade vortex interaction studies Experiments in Fluids 18 95 99 1994
- Grant I. Lui A. Method for the efficient incoherent analysis of particle image velocimetry images Applied Optics 28 1745 1748 1989