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Effect of periodic blowing/suction through sequentially located annular slots on the turbulent boundary layer on a body of revolution

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Thermophysics and Aeromechanics Aims and scope

Abstract

The effect of local periodic forcing in the form of blowing/suction through sequentially located annular slots on the features of the turbulent boundary layer formed on an axisymmetric body of revolution in an incompressible flow is studied experimentally. The Reynolds number based on the momentum thickness of the boundary layer ahead of the annular slot is 1362. The dimensionless amplitude of the forcing signal A 0 is set to be 0.4. The frequency of the forcing signal in the law-of-the-wall units is f + = 0.0048. Beginning from the distance upstream from the slot equal approximately to half-thickness of the displacement thickness of the boundary layer δ* and further downstream to 18 δ*, a stable decrease in local friction is observed; the maximum value of this decrease reaches 50 %. Each next slot favors reduction of friction, though the effectiveness of blowing/suction becomes noticeably lower in the downstream direction.

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  1. Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia

    A. V. Boiko & V. I. Kornilov

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  1. A. V. Boiko
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  2. V. I. Kornilov
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Boiko, A.V., Kornilov, V.I. Effect of periodic blowing/suction through sequentially located annular slots on the turbulent boundary layer on a body of revolution. Thermophys. Aeromech. 15, 11–27 (2008). https://doi.org/10.1134/S0869864308010022

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