自動車の空気抵抗を増大させる車体周りの流れ構造 : 第1報,トランクデッキ上の流れ構造(流体工学,流体機械)

概要

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Under the consideration of global warming, improvement of vehicle's fuel economy is a major challenge. Reduction of aerodynamic drag is an important item in vehicle engineering. However, as vehicle is also strongly oriented to design, aerodynamic drag must be reduced maintaining flexibility of design. In order to do so, it is necessary to clarify the characteristic flow structure around vehicle that increases aerodynamic drag. This means it is essential to optimize the flow field while allowing design flexibility. This study used a sedan type vehicle which allows design flexibility in an attempt to clarify the flow structure around vehicle that increases aerodynamic drag. As an initial report, this study reveals the flow structure above trunk deck by investigating wakes behind vehicles with different aerodynamic drag. As a result, it was clarified that trailing vortices behind vehicle enhance to increase aerodynamic drag of vehicle, as front pillar vortices enhance above trunk deck.
2009-08-25