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Turbulent boundary layer manipulation by outer-layer devices

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Abstract

A turbulent boundary layer manipulated by outer-layer devices has been studied. Experiments have been conducted in the 0.70 by 0.50 m2 low speed wind tunnel of the ‘Modesto Panetti’ Aeronautical Laboratory of the Politecnico di Torino. Mean values and turbulent quantities measured in the natural and manipulated boundary layers are shown for comparison. The mechanisms to explain the observed skin friction and turbulence reduction are discussed. The manipulator wake effect, consisting in decoupling the wall-region from the boundary layer outer-region, is stressed in the present results.

Sommario

Viene studiato uno strato limite turbolento manipolato, utilizzando la tecnica degli ‘outer-layer devices’. Gli esperimenti sono stati condotti nella galleria del vento 0.70×0.50 m2 del Laboratorio di Aeronautica ‘Modesto Panetti’ del Politecnico di Torino. Sono confrontati risultati relativi ai casi di flusso non manipolato e manipolato. Vengono discussi i meccanismi che conducono alla riduzione dello sforzo di attrito a parete e delle quantità turbolente; in particolare si punta l'attenzione sull'effetto decorrelante della scia del manipolatore.

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Authors and Affiliations

  1. Dipartimento di Ingegneria Aeronautica e Spaziale, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy

    G. Iuso & M. Onorato

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  1. G. Iuso
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  2. M. Onorato
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Iuso, G., Onorato, M. Turbulent boundary layer manipulation by outer-layer devices. Meccanica 30, 359–376 (1995). https://doi.org/10.1007/BF00993419

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  • DOI: https://doi.org/10.1007/BF00993419

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