Abstract
The present paper summarizes one of the latest experimental studies, undertaken at ONERA/CERT in subsonic flows. It deals with the efficiency of internal manipulators, commonly named by many researchers riblets, in three-dimensional boundary layer flows. The flow developing on both sides of an ONERA D section aerofoil, set at 22.5° angle of sweep, has been manipulated using different riblet vinyl adhesive films. These latter were covering almost 85% of the chord length. Total drag variations were estimated from Pitot tube surveys, performed at about one chord length behind the aerofoil trailing edge. Two chord Reynolds numbers have been considered: 2.65 105 and 4.25 105. On both sides of the aerofoil, grooves have been aligned with the free-stream flow direction. Skin-friction drag decreases of up to 5–6% have been recorded when the dimensionless rib height, scaled with wall units, is less than 15–20.
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© 1991 Springer Science+Business Media Dordrecht
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Coustols, E. (1991). Performances of internal manipulators in subsonic three-dimensional flows. In: Choi, KS. (eds) Recent Developments in Turbulence Management. Fluid Mechanics and Its Applications, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3526-9_3
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DOI: https://doi.org/10.1007/978-94-011-3526-9_3
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