自動車のエンジンルーム冷却風による空気力学的影響

抄録

The purpose of this research is to clarify the change of characteristics of aerodynamic drag and lift of a car by the engine loading system (engine arrangement) and the air inlet system (opening area and position) with and without a radiator in wind-tunnel experiments. A simplified car model with 1/5 scale is generated with reproduction of the engine room with the transparent acryl externals for visualization. In the wind-tunnel experiments, the moving-belt ground board is adopted to capture ground effects with force measurements by use of load cells. Flows are visualized and measured by a smoke method. As results, with enlargement of the opening area, the drag increased overall although depending largely on the engine loading system and the opening position, the front lift increased and the rear left decreased; the effect of the radiator was to relieve the change of the drag and lift.