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ISSN オンライン: 2642-0554

NEAR WALL FLOW STRUCTURE OF INCLINED CYLINDER INTERACTING WITH DIFFERENT BOUNDARY LAYER THICKNESS

Takaaki Shizawa
Department of Mechanical Engineering, Science University of Tokyo 1-3 Kagurazaka Shinjuku-ku, Tokyo 1628601, Japan

Kenichi Ohta
Department of Mechanical Engineering, Science University of Tokyo 1 -3 Kagurazaka Shinjuku-ku, Tokyo 1628601, Japan

要約

A circular cylinder, established on a wall, includes several complex problems in the structure of the flow field. First problem is the spanwise fluctuation of wake shedding and second one is the inclined angle of the cylinder. Next problem is the end effects of the cylinder. Last problem is the turbulence of the approaching free stream.
There is little fundamental research work about the formation and the development of the wake of an inclined cylinder interacting with a boundary layer. This paper presents an experimental study focused on the near wall three-dimensional structure of the inclined cylinder interacting with two cases of boundary layer thickness. A cylinder is established on a flat wall where a two-dimensional turbulent boundary layer is developed. Nine cases of inclined cylinder, inclined angle of ±30°, ±20°, ±15°, ±10° and 0° are investigated. The size of horseshoe vortex is changed exponentially to the inclined angle. The remarkable influences depending on the boundary layer thickness are observed at the structure of the wake, in case of inclined backward and normal cylinder. The structure is not affected by the boundary layer thickness, in case of inclined forward cylinder.