A Two-Measurement Correction for the Effects of a Pressure Gradient on Automotive, Open-Jet, Wind Tunnel Measurements 2006-01-0568
This paper provides a method that corrects errors induced by the empty-tunnel pressure distribution in the aerodynamic forces and moments measured on an automobile in a wind tunnel. The errors are a result of wake distortion caused by the gradient in pressure over the wake.
The method is applicable to open-jet and closed-wall wind tunnels. However, the primary focus is on the open tunnel because its short test-section length commonly results in this wake interference. The work is a continuation of a previous paper [4] that treated drag only at zero yaw angle.
The current paper extends the correction to the remaining forces, moments and model surface pressures at all yaw angles. It is shown that the use of a second measurement in the wind tunnel, made with a perturbed pressure distribution, provides sufficient information for an accurate correction. The perturbation in pressure distribution can be achieved by extending flaps into the collector flow.
Citation: Mercker, E. and Cooper, K., "A Two-Measurement Correction for the Effects of a Pressure Gradient on Automotive, Open-Jet, Wind Tunnel Measurements," SAE Technical Paper 2006-01-0568, 2006, https://doi.org/10.4271/2006-01-0568. Download Citation
Author(s):
E. Mercker, K. R. Cooper
Affiliated:
BMW AG, NRC
Pages: 18
Event:
SAE 2006 World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Vehicle Aerodynamics 2006-SP-1991, SAE 2006 Transactions Journal of Passenger Cars: Mechanical Systems-V115-6
Related Topics:
Wind tunnel tests
Pressure
Yaw
Aerodynamics
Drag
Logistics
Flaps
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