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The Measurement of Transient Aerodynamics Using an Oscillating Model Facility
Technical Paper
2006-01-0338
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A method for the estimation of transient aerodynamic data from dynamic wind tunnel tests has been developed and employed in the study of the unsteady response of simple automotive type bodies. The paper describes the facility and analysis techniques employed and reports the results of a parametric study of model rear slant angle and of the influence of C-pillar strakes. The model is shown to exhibit damped, self-sustained and self-excited behaviour. The transient results are compared with quasi-steady predictions based on conventional tunnel balance data through the calculation of derivative magnification factors. For all slant angles tested the results show that the quasi-steady prediction is a poor estimate of the real transient behaviour. In addition the slant angle is shown to have significant effect on the level of unsteadiness. The addition of C-pillar strakes is shown to stabilise the flow with even small height strakes yielding responses well below that of steady-state.
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Citation
Passmore, M. and Mansor, S., "The Measurement of Transient Aerodynamics Using an Oscillating Model Facility," SAE Technical Paper 2006-01-0338, 2006, https://doi.org/10.4271/2006-01-0338.Also In
SAE 2006 Transactions Journal of Passenger Cars: Mechanical Systems
Number: V115-6; Published: 2007-03-30
Number: V115-6; Published: 2007-03-30
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