Abstract
In the present investigation surfaces with passive manipulators randomly distributed are studied both in an equilibrium turbulent boundary layer with slightly favorable pressure gradient and in decelerated flows. The main aim of the work is to evaluate the effectiveness of the manipulators for drag reduction in a turbulent boundary layer and their behavior in the limiting strong adverse pressure gradient that characterizes the conditions for maximum pressure recovery. The manipulators consist of a pseudo random 3D V-shaped roughness whose geometry and distribution are function of the Reynolds Number. The drag variations were estimated by direct comparison with measurements conducted with smooth boundaries. What we found is a significant stable drag reduction (up to a maximum of 30%) in a narrow range of Reynolds Numbers, and a small effect on separated flow.
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Monti, R., De Ponte, S., Levich, E. (2001). Effects on the Resistance and on the Separation of V Shapes Passive Manipulators in a Turbulent Boundary Layer. In: Soldati, A., Monti, R. (eds) Turbulence Structure and Modulation. International Centre for Mechanical Sciences, vol 415. Springer, Vienna. https://doi.org/10.1007/978-3-7091-2574-8_9
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DOI: https://doi.org/10.1007/978-3-7091-2574-8_9
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