On the vertical large eddy breakup device capability to decrease the turbulent drag |
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Authors: | A V Boiko V I Kornilov |
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Institution: | 1. Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
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Abstract: | The possibility of decreasing the turbulent friction with the use of streamwise-aligned vertical large eddy breakup devices
installed normal to the surface of a flat plate in an incompressible equilibrium turbulent boundary layer with a nominally
gradientless flow past this plate is studied experimentally. The Reynolds number based on the boundary-layer momentum thickness
is 1099 in the cross section where these vertical devices are mounted. It is shown that elements of this geometry are effective
tools for modification of the turbulent boundary layer from the viewpoint of both the gain in friction drag and the suppression
of turbulent fluctuations of velocity and, hence, can be considered as one of the most important factors of controlling the
structure of the near-wall turbulence in the flow past a flat surface. |
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Keywords: | |
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