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A Two-Measurement Correction for the Effects of a Pressure Gradient on Automotive, Open-Jet, Wind Tunnel Measurements
Technical Paper
2006-01-0568
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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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.Also In
SAE 2006 Transactions Journal of Passenger Cars: Mechanical Systems
Number: V115-6; Published: 2007-03-30
Number: V115-6; Published: 2007-03-30
References
- Mercker, E. Wiedemann J. On the correction of Interference Effects in Open Jet Wind Tunnels SAE 96061, Society of Automotive Engineers Detroit, MI, USA Feb. 1996
- Mercker, E. Wickern G. Wiedemann J. Contemplation of Nozzle Blockage in Open Jet Wind-Tunnels in View of Different 'Q' Determination Techniques SAE 970136, Society of Automotive Engineers Detroit, MI, USA Feb. 1997
- Wiedemann, J. Fischer O. Jiabin Pang Further Investigations on Gradient Effects SAE 2004-01-0670, Society of Automotive Engineers Detroit, MI, USA March 2004
- Mercker, E. Cooper, K.R. Fischer O. Wiedemann J. The Influence of a Horizontal Pressure Distribution on Aerodynamic Drag in Open and Closed Wind Tunnels SAE 2005-01-0867, Society of Automotive Engineers Detroit, MI, USA April 2005
- Ewald B.F.R. Wind Tunnel Wall Correction AGARD-AG-336, Advisory Group for Aerospace Research & Development France 1998
- Barlow, Jewel B. Rae, William H. Jr. Pope Alan Low-Speed Wind Tunnel Testing. Third Edition John Wiley & Sons, Inc.