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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/4614

Title: An experimental study of unsteady vehicle aerodynamics
Authors: Passmore, M.A.
Richardson, S.
Imam, A.
Keywords: Vehicle cross-wind stability
Cross-wind sensitivity
Unsteady aerodynamics
Admittance
Oscillating aerofoil
Side force
Yaw moment
Issue Date: 2001
Publisher: © IMechE / Professional Engineering Publishing
Citation: PASSMORE, M.A., RICHARDSON, S. and IMAM, A., 2001. An experimental study of unsteady vehicle aerodynamics. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 215(7), pp. 779-788.
Abstract: The transient response of a vehicle to a wind disturbance is of importance to car drivers since low level inputs can result in poor vehicle refinement, and extreme effects can result in path deviation. This paper investigates the use of an oscillating aerofoil gust generator to simulate the transient aerodynamic effects produced on a car-type bluff body during a simplified sinusoidal side gust interaction. A simplified bluff body was exposed to a range of sinusoidal cross-wind excitations corresponding to a reduced frequency of between 0.09 and 0.71 based on the model length. Unsteady measurements of surface pressure are processed to determine the side force and yaw moment and the aerodynamic magnification (***a) is calculated by comparing the transient response with a quasi-steady prediction. The transient yaw moment response is shown to exceed the quasi-steady by as much as 30 per cent. The transient side force is generally significantly less than the quasi-steady value except at the lowest frequency tested. The change in response is attributed to changes in the strength of the front and rear pillar vortices and to changes in phase relative to the quasi-steady response.
Description: This article has been published in the journal, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering [© PEP]. The definitive version is available at: http://dx.doi.org/10.1243/0954407011528365
Version: Published
DOI: 10.1243/0954407011528365
URI: https://dspace.lboro.ac.uk/2134/4614
ISSN: 0954-4070
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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