鈍頭物体まわりの剥離流れと渦構造(平均流の特性)

概要

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The separation now and the vortical structure of a bluff body is experimentally investigated. Ahmed model which is the fundamental geometry of a hatchback-type car was used as the bluff body. This model has interchangeable after-bodies with slanted bases having slant angles from 0°to 40°. The model was installed on a ground plate in a uniform flow in the test section of the water channel. And the velocity distribution in the near wake was measured by using LDV. Also the vortical structures are examined by the flow visualization technique. In the wake flow of the model which the base slant angle αis 20°, it was confirmed that a pair of trailing vortices generate. The vortical structure behind the base slant made remarkable chage between α=20°and 30°. The region of wake behind Ahmed's body becomes narrow in the downstream direction.
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