抄録
Front and rear spoilers have been in use as aerodynamic aids for automobile drag and lift reduction. However, the flow field effects which produce these improvements have not been well understood. Wind tunnel tests were perfomed under the boundary layer control using a suction box and a moving ground plane. A body similar to a ground vehicle such as a bus is proportioned. The model is tested with wheels, a front spoiler, a rear spoiler and proximity to the moving ground plane. Results are presented from an experimental study of the lift, drag, pitching moment and flow field of the near wake of the body. These spoilers reduce the aerodynamic lift and pitching moment for improved high speed stability and handling. The rotation of wheels is found to give significantly different lift and drag for small ground clearances characteristic of actual road vehicles.
