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Comparison of Different Ground Simulation Techniques for Use in Automotive Wind Tunnels
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Abstract
The range of applicability and the physical restrictions for the use of ground-simulation techniques in automotive wind tunnels are elucidated. The techniques considered are the moving-belt technique, as well as boundary layer control techniques like tangential blowing and distributed normal suction for use in wind tunnels with stationary ground boards. Attention has to be paid to the question of whether the flow to be simulated is of boundary layer or Couette type. In the case of boundary layer flow, interaction of the ground-floor boundary layer with the inviscid flow in the gap between a vehicle and the road can be fully simulated by introducing a negative transpiration velocity along the stationary ground plane. In practise however, angularity effects on the external flow result from mismatched control parameters. Very small relative ground clearances give rise to the formation of a Couette flow between the road and the vehicle. For this type of gap flow interaction with the rest of the flow field around the car vanishes asymptotically. When performing tests on a stationary ground board, mass and momentum have to be added to the gap flow to meet the characteristics of the moving-ground case. This can be achieved by tangential blowing.
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Mercker, E. and Wiedemann, J., "Comparison of Different Ground Simulation Techniques for Use in Automotive Wind Tunnels," SAE Technical Paper 900321, 1990, https://doi.org/10.4271/900321.Also In
References
- BEESE, E. 1982
- WIEDEMANN, J. 1987
- WIEDEMANN, J. Some Basic Investigations into the Principles of Ground Simulation Techniques in Automotive Aerodynamics SAE Paper 890369 Detroit 1989
- CARR, G.W. A Comparison of the Ground-Plane-Suction and Moving-Belt Ground-Representation Techniques SAE Paper 880249 Detroit 1988
- BEARMAN, P.W. DE BEER, D. HAMIDY, E. HARVEY, J.K. The Effect of a Moving Floor on Wind-Tunnel Simulation of Road Vehicles SAE Paper 880245 Detroit 1988
- MERCKER, E. KNAPE, H.W. Ground Simulation with Moving Belt and Tangential Blowing for Full-Scale Automotive Testing in a Wind Tunnel SAE Paper 890367 Detroit 1989
- LARSSON, L. HAMMAR, L. NILSSON, L.U. BERNDTSSON, A. KNUTSON, K. DANIELSON, H. A Study of Ground Simulation - Correlation between Wind-Tunnel and Water-Basin Tests of a Full-Scale Car SAE Paper 890368 Detroit 1989
- BERNDTSSON, A. ECKERT, W.T. MERCKER, E. The Effect of Groundplane Boundary Layer Control on Automotive Testing in a Wind Tunnel SAE Paper 880248 Detroit 1988
- SCHLICHTING, H. Boundary-Layer Theory Seventh McGraw-Hill New York 1979
- TRUCKENBRODT, E. Fluidmechanik Band 1 Springer-Verlag Berlin, Heidelberg, New York 1980
- IGLISCH, R. 1944 1949
- ULRICH, A. 1944
- GERSTEN, K. PAPENFUSS, H.D. GROSS, J.F. Second Order Boundary Layer Flow With Hard Suction AIAA Journal 15 1750 1755 1977
- WIEDEMANN, J. 1983
- GARTSHORE, I.S. NEWMAN, B.G. The Turbulent Wall Jet in an Arbitrary Pressure Gradient Aero. Quart. 20 25 56 1969
- THOMAS, F. 15 1963 Bogen., H.J. Verlag Friedr. Vieweg&Sohn Braunschweig
- TURNER, J.S. Buoyancy Effects in Fluids Cambridge University Press 1973
- TELIONIS, P.D. Unsteady Viscous Flows Springer Series in Computational Physics Springer Verlag New York 1981
- HACKETT, J.E. BOLES, R.A. Moving-Ground Simulation by Tangential Blowing J. Aircraft 16 12 Article No. 78-814R Dec. 1979