Vehicle aerodynamicists are aware that the boundaries of a test section can strongly influence the measurements of aerodynamic characteristics of vehicles tested in a wind tunnel. Wall interference was experimentally investigated in a solid and two open-area-ratio (OAR) slotted wall test sections. The blockage interference was studied using surface pressure from three scales of the Motor Industry Research Association (MIRA) notch-back reference model, representing 8.3, 13.0 and 18.7 percent area blockage. Tests were also performed using flat plates with area blockages between 1.6 and 20 percent. A wall pressure signature matching method was used to determine the wall induced 'interference velocity' at the model location for the solid wall test section. Comparison was made between the predicted 'free-air' pressures and those measured in the 30 percent OAR slotted wall test section. It was shown that a slotted wall test section can provide a virtually interference free testing environment.
Experimental evaluation of test section boundary interference effects in road vehicle tests in wind tunnels
Experimentelle Auswertung der Beeinflussung von Strassenfahrzeugversuchen in Windkanaelen durch Versuchsanlagenbegrenzung
1985
12 Seiten, 19 Bilder, 1 Tabelle, 12 Quellen
Aufsatz (Konferenz)
Englisch
British Library Conference Proceedings | 2005
|British Library Conference Proceedings | 2004
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