平板後縁に平行な等間隔針金格子上を流下する乱流境界層

概要

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Turbulent boundary layers subjected to a sudden change ill boundary condition from a smooth flat plate to a "rod wall" with two dimensional openings have been studied experimentally. The rod wall consists of circular wires, which are equally spaced in the streamwise direction and whose diameter is the same as the thickness of the upstream plate. Three different spacings of wires are tested; the spacings are two to four times of wire diameter. Comparative measurements are made on rough walls which are geometrically the same as the rod walls but have no openings. With decreasing the wire spacing, the internal layer formed downstream of the change in wall condition develops faster and the turbulence intensity of longitudinal velocity component becomes larger. Pronounced maximum occurs in the transverse distribution of the flatness factor of velocity fluctuation, which yields a measure of the internal-layer thickness.
一般社団法人日本機械学会の論文
1999-02-25