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A full-scale wind-tunnel experiment for studying the noise induced by the A-pillar vortex in a vehicle under different flow conditions

Abstract : This study aims to experimentally investigate the aerodynamic and acoustic phenomena related to the A-pillar vortex, with a particular focus on the upstream flow characteristics (velocity, turbulence, yaw angle) and their impact on the A-pillar vortex and on the noise in the cabin. In this purpose, a full-scale wind tunnel experiment with an 3/4 open jet test section type has been set up, using a production vehicle. The turbulence of the impinging flow is varied by using a bluff body generating a wake upstream the vehicle under study. In a synchronized manner, aerodynamic and wall-pressure measurements on the left front glass of the vehicle were performed, as well as sound pressure measurements in the vehicle. The influence on the flow characteristics on the power spectral density of the data will be analysed, focusing in particular on the yaw angle and the turbulence of the impinging flow. Some results concerning the noise fluctuation inside the cabin will also be presented, showing the influence of the upstream turbulence.
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https://hal-univ-lyon1.archives-ouvertes.fr/hal-03215256
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Submitted on : Tuesday, May 4, 2021 - 3:58:41 PM
Last modification on : Friday, May 7, 2021 - 10:54:35 AM
Long-term archiving on: : Thursday, August 5, 2021 - 7:11:05 PM

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Alexandre Da Silva, Vincent Valeau, François Vanherpe, Guillaume Bonnavion. A full-scale wind-tunnel experiment for studying the noise induced by the A-pillar vortex in a vehicle under different flow conditions. e-Forum Acusticum, Dec 2020, Lyon, France. pp.1523-1526, ⟨10.48465/fa.2020.0549⟩. ⟨hal-03215256⟩

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