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Experimental and Numerical Study of Wind Noise Caused by Cowl Area on Volvo XC60

Olga Roditcheva (Institutionen för tillämpad mekanik, Fordonsteknik och autonoma system)
15th Stuttgart International Symposium Vol. 1 (2015), p. 471-484.
[Konferensbidrag, övrigt]

The paper presents a detailed experimental and numerical study of aerodynamically produced noise which occurs due to turbulent structures created by the cowl cavity and side mirror. The study aims to answer the question about how much turbulence in the cowl area contributes to the overall wind noise level. Measurements were carried out at the Volvo wind tunnel on a Volvo XC60. Configurations considered were: rear view mirror On/Off with the cowl cavity open/closed. The results discussed in this paper include intensity probe measurements in the flow as well as standard measure-ments in the car. The experimental results are compared to numerical data, which are presented as isocontours of lambda 2 criterion and pressure fluctuations.

Nyckelord: wind noise, sound sources, sound intensity, aeroacoustics


Exterior intensity sound measurement were performed on a Volvo XC60 with side mirrors and with mirrors removed as well as with the cowl cavity open and closed. Interior measurements were carried out for all configurations. It was shown that the cowl cavity is an important wind noise source and it can contribute to overall noise level inside the compartment. Improvement around 2% Articulation Index can be achieved. Configurations of interest were modeled numerically. The shift of flow around the car was illustrated and proven to have good similarity with experiment. Pressure RMS and illustration of vortex core can be recommended for future development. For the development on early stages of the project, it is recommended to perform optimization of the cowl area with side mirrors removed. Measurements with intensity probe at the cowl position are recommended. The method was successfully implemented for the development of the all new Volvo XC90 model.



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Denna post skapades 2015-12-18. Senast ändrad 2015-12-18.
CPL Pubid: 228694