The Effect of Groundplane Boundary Layer Control on Automotive Testing in a wind Tunnel 880248

Two different techniques, ground plane suction and blowing, were used in order to decrease the displacement thickness of the floor boundary layer in wind tunnels upstream of full-scale vehicles.
A detailed description of both systems is given and comparison tests in three different wind tunnels were carried out.
The vehicles tested were full-size passenger cars and simplified-model cars of notch back, fast back and wagon back type, as well as sport cars and a racing car with different trim heights simulating different ground clearances.


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