Time-accurate analysis is necessary for our understanding of the behaviour and construction of the near-wake region. This knowledge enables the generation of new ideas and approaches for improved automobile aerodynamic design. A combination of several novel experimental and processing techniques has yielded further insight into the structure and periodicity of the near-wake. Integration of timeaccurate experimental surface pressures over the rear of a notchback vehicle has provided an estimate of the fluctuating lift and drag forces on the backlight and decklid. Experiments were performed in a full-scale open-jet wind tunnel and on-road in 'still' conditions. Two near-wake frequencies were identified: 0.11 Uinfinite/xR and 0.41 Uinfinite/XR, where XR - reattachment length. The origin of the low-frequency pressure fluctuations was not identified; however the higher frequency was associated with a hairpin vortex shed from the separated region behind the backlight and over the boot- or deck-lid.
Unsteady flow structures and forces over/on the rear window and boot lid of sedan automobiles
Instationäre Strömung und Strömungskräfte über/auf Heckscheiben und Karosserie von Limousinen
2004
14 Seiten, 9 Bilder, 27 Quellen
Aufsatz (Konferenz)
Englisch
Unsteady flow structures and forces over/on the rear window and boot lid of sedan automobiles
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