F209 FLOW AND HEAT TRANSFER CHARACTERISTICS OF A TURBULENT BOUNDARY LAYER DISTURBED BY AN ELLIPTIC CYLINDER(Complex turbulent flows)

概要

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Flow structure of a turbulent boundary layer over a flat plate disturbed by an elliptic cylinder was investigated experimentally. Four elliptic cylinders having different axis ratio, but with the same cross sectional area, were used to disturb the turbulent boundary layer whose thickness is greater than the equivalent cylinder diameter. The surface pressure and heat transfer coefficients on the flat plate were measured with varying the gap distance between the elliptic cylinder and plate. The mean velocity and turbulent intensity profiles of streamwise velocity component were measured using a hot-wire anemometry. As a result, the flow structure and local heat transfer were affected by the interaction between the cylinder wake and turbulent boundary layer as a function of the gap ratio. As the axis ratio of the elliptic cylinder increases, the critical gap ratio is increased and the surface pressure on the flat plate is recovered rapidly at downstream location. The maximum heat transfer rate occurs at the gap ratio of G/B = 0.5, where the flow interaction between the lower shear layer of the cylinder wake and the turbulent boundary layer is strong.
一般社団法人日本機械学会の論文
2000-10-01