Aerodynamic Characteristics of a Circular Cylinder Affected by a Turbulent Plane Mixing Layer

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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 numbers based on the cylinder diameter d and the main-slow velocity outside the mixing layer were 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 2.0, 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.
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