Abstract
Efforts are currently underway in many laboratories to simulate correctly the ground effects which occur in windtunnels used for studies in automobile aerodynamics. An experimental approach which is sometimes used, the moving belt technique, is both complicated and expensive. On the other hand, if the model is rapidly accelerated along a stationary rail by a pneumatic launch system, the relative motion between the car and the road is simulated in an optimum manner with less effort and lower costs. The practical advantages and disadvantages of the moving-model technique in comparison with the moving belt in a windtunnel are discussed. Using a two-dimensional model car, the effect of the ground on the body pressure distribution was investigated. In addition, the distribution of the pressure on the surface of the ground board and the velocity profiles underneath the model were measured.
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