Recent studies have shown that ground effect boundary conditions simulated in the wind tunnel could be quite different compared with those experienced by the vehicle on the road. The focus of this research was on the influence of moving ground simulation on both aeroacoustic and aerodynamic measures for a typical European luxury saloon. The acoustic influence due to moving ground and rotating wheels including both flow effects and the mechanical noise contribution, as well as the influence of underbody devices were examined. A 5 dBA SPL reduction for the underbody blocked case compared with the fixed ground and fixed wheels case was concentrated mainly at lower frequencies (≤ 500 Hz). For both ground simulations and especially moving ground, the rear seat channels obtained higher cabin SPL values compared with front seats, for f≥1 kHz. Performing aeroacoustic measurements without mechanical masking is possible with moving ground across the spectrum; however it would be only possible at lower frequencies for moving ground and rotating wheels. For FROE, the effect of the castellated blade on noise reduction was greater for most frequencies compared with solid blade. The opposite happened for RLOE. Both blades generated higher front lift and lower rear lift values especially for moving ground and rotating wheels.
Interactions between underbody aerodynamics and aeroacoustics
2014
11 Seiten, Bilder, 27 Quellen
Conference paper
English
Aerodynamics and Aeroacoustics
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