The influence of ground simulation on the aerodynamics of simple car shapes with an underfloor diffuser
Published July 18, 1994 by Royal Aeronautical Society in United Kingdom
Event: Vehicle Aerodynamics
All full scale car aerodynamic development is carried out using wind tunnels where the floor of the tunnel represents the ground surface. This false boundary condition is accepted as a necessity but it is generally assumed that the basic ground simulation is adequate for road cars. Many model scale wind tunnels do, however, allow testing to be conducted using alternative ground simulation techniques, which may be more representative. As part of a continuing investigation into the limitations of current wind tunnel test techniques for road car aerodynamic development, simple wheelless bodies representing car shapes have been tested in the MIRA Model Wind Tunnel. These bodies generate a range of drag and lift characteristics by interchanging rear end shapes and for this study are fitted with an adjustable rear underbody diffuser. The models have been tested using various ground simulations available in the MIRA wind tunnel, comprising moving belt, stationary belt, and fixed ground. The effect os ground clearance on diffuser performance is assessed.
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