壁乱流の内層構造に及ぼす空間的干渉の影響 : 第2報,干渉板の流れ方向ピッチの影響

概要

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Spatial restrictions were imposed on the inner layer structure of the turbulent boundary layer which was developing on a moving flat-plate, by means of putting a fixed array of vertical plates close to the moving plate. The nondimensional gap h^+ between the flat-plate and the tips of the interfering vertical plates as well as the nondimensional pitch p^+ of the interfering plates were systematically changed. From hot-film anemometer measurements, states of flows were distinguished into three regions in the h^+ vs. p^+ plane, i. e., laminar, transitional, and fully turbulent regions. With increase in the pitch p^+, the gap h^+ needed to maintain turbulence decreased mildly from 40. This was explained with a view of the distribution of sizes of the coherent structures in the inner layer.
一般社団法人日本機械学会の論文
1987-07-25