乱流自由混合層の内部およびその近傍にある円柱の特性

概要

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The time-mean and fluctuating forces acting on a circular cylinder placed in and near a turbulent plane mixing layer and its vortex-shedding properties were experimentally investigated. Reynolds number based on the cylinder diameter d and the main-flow velocity outside the mixing leyer was 3.4 × 10^4 and 4.3 × 10^4 for the force measurements and in a range 5.5 × 10^3 〜 4.4 × 10^4 for the measurement of the vortex-shedding properties. When the parameter d/δ,δ being a width of the mixing layer, was of the order of 2.0m the time-mean force showed a sharp maximum near the center of the mixing layer : the r.m.s, force was larger by about 40 percent near the edge of the mixing layer than in the main flow. Strouhal number of vortex-shedding was found to be smaller when the cylinder was immersed in the mixing layer than when it was in a uniform main flow. The extent of the reduction and lateral positions where the reduction began were dependent on the parameter d/δ.
一般社団法人日本機械学会の論文
1985-01-25