Applied Sciences, Vol. 15, Pages 10029: Study on Aerodynamic Noise of Ahmed Body Mounted with Different Spoiler Configurations

Applied Sciences doi: 10.3390/app151810029

Authors:
Zhi-Ping Wang
Wei Zhang
Hao-Ran Li
Hai-Chao Zhou

This study employs computational fluid dynamics methods to investigate the aerodynamic noise of a 35° inclination Ahmed body mounted with six hollow spoilers of different opening areas. The study combines the steady k-ε model and the transient large eddy simulation model, and extracts acoustic data through the Ffowcs-Williams & Hawkings equation. The results show that all spoilers can effectively reduce noise, but there is a non-near relationship between the noise reduction effect, aerodynamic drag, and opening area of the spoilers. Among them, Case 4 achieves the optimal noise reduction effect, though its drag is slightly higher than that of the Base model. Flow field analysis reveals that the 300 Hz noise peak originates from the entrainment of side airflow into the wake region. The hollow spoilers achieve noise reduction by altering the vortex structures in the wake, and this finding provides targeted guidance for the optimization design of spoilers, helping to deepen the understanding of the mechanism by which hollow spoilers affect aerodynamic noise.

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Zhi-Ping Wang www.mdpi.com