Abstract
A low-order panel method has been devised for calculating wall interference corrections to the measured drag force in automotive wind tunnels with closed, 34-open or slotted-wall test sections. The method is applied to the Motor Industry Research Association (MIRA) generic car model, tested in three working sections of the German-Dutch Wind Tunnel (DNW), and to three subscale models tested in the DSMA closed-circuit pilot wind tunnel with closed and slotted walls. The calculations show that the drag measurements in closed test sections and 34-open test sections require negative and positive corrections, respectively, whereas inside a test section with 30% open longitudinally slotted walls the measurement is nearly interference-free.
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