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ISSN オンライン: 2642-0554

UPSTREAM TURBULENCE EFFECTS IN THE SPATIO-TEMPORAL CHARACTERISTICS OF A MODEL A-PILLAR VORTEX

Faisal Affejee
Institut Pprime, UPR CNRS 3346, ENSMA, Universite de Poitiers, BP 40109, 86961 Futuroscope Chasseneuil Cedex, France

Christophe Sicot
Institut Pprime, UPR CNRS 3346, ENSMA, Universite de Poitiers, BP 40109, 86961 Futuroscope Chasseneuil Cedex, France

Rodolphe Perrin
Institut Pprime, UPR CNRS 3346, ENSMA, Universite de Poitiers, BP 40109, 86961 Futuroscope Chasseneuil Cedex, France

Jacques Boree
Institut Pprime, UPR CNRS 3346, ENSMA, Universite de Poitiers, BP 40109, 86961 Futuroscope Chasseneuil Cedex, France

要約

Conical vortices generated over surfaces having a swept angle with the incidence wind are found in a large class of practical applications. The study presented in this paper is related to the aerodynamic and aero-acoustic of passenger vehicles. More particularly, we focus on the A-pillar vortex, arising on the corner edge, between the windshield and the front side window. The incoming flow fields encountered by passenger cars is highly turbulent due to the natural wind or other road traffic. The goal of the paper is then twofold: (i) educe the spatial and temporal characteristics of the A-pillar conical vortex, (ii) investigate the influence of a turbulent stream on these characteristics. For that purpose, a database of simultaneous stereoscopic HS-PIV and fluctuating wall pressure measurements was compiled. A spectral analysis of the fluctuating pressure under the vortex is used to analyze the link between the unsteady aerodynamics and the wall pressure field. It has been observed a significant amplification of the meandering of the structure highlighting the high receptivity of this structure to perturbations generated by external turbulence.