直列配列2角柱に作用する変動流体力 : 主流に小さな流れを与えた場合

概要

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Fluctuating fluid forces acting on two square prisms of the same dimension in tandem arrangement under small free-stream turbulence (√<u'^2>/U_0=1.4%) were studied experimentally. Measurements of the fluid forces and the Strouhal number for the spacing ratio between tow prisms s/w (s: spacing between two prisms, w: width of prism) up to 10 yielded the following results: (i) Jump phenomenon which appears at s/w=3 in a smooth free-stream appears in the region 2.1≦s/w≦3.0 and the flow pattern becomes unstable when small turbulence is introduced in the free-stream. (ii) A method of obtaining the fluid forces in the jump-flow region where two flow patterns appear intermittently was introduced. (iii) Under a small turbulence in the free-stream, both the fluid forces and Strouhal number were found to change considerably compared to those of smooth free-stream. (iv) Distribution of the Strouhal number with s/w was classified into four regions, and the characteristics of the vortex pattern for each region were clarified.
一般社団法人日本機械学会の論文
1986-12-25