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Characterization of a highly efficient chevron-shaped anti-contamination device

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Abstract

This paper is devoted to the characterization of an optimized chevron-shaped anti-contamination device (ACD). This device can prevent efficiently the propagation of turbulence from the fuselage along the attachment line (hypothetical streamline that spreads the flow going to suction side and the one going to pressure side) of swept wings and enables the development of a new laminar boundary layer downstream. More specifically, the aim is to prevent boundary-layer transition along the attachment line by a contamination process. This process is characterized by the typical Reynolds number \(\overline{R}\) and the associated Poll’s criterion. Thus, ACD efficiency will be expressed in terms of \(\overline{R}\) values. Some experiments performed on a new numerically optimized ACD have shown its ability to prevent leading-edge contamination up to \(\overline{R}\) values close to the natural transition process of the laminar boundary layer along the attachment line. The corresponding stability analysis of the laminar boundary layer is made using the Görtler–Hämmerlin stability approach. The study is completed with the different transition processes that can occur downstream the attachment line, around the airfoil, especially with crossflow analysis.

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Notes

  1. Here, it is assumed that the external disturbance level is raher low so that the transition is not driven by the so-called bypass mechanism, see Morkovin et al. (1994).

  2. van Driest and Blumer (1962) and von Doenhoff and Braslow (1961) criteria.

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Acknowledgments

Part of this work has been undertaken within the Joint Technology Initiative «JTI Clean Sky» and specifically in the framework of the Smart Fixed Wing Aircraft Integrated Technology Demonstrator (SFWA-ITD Contract No. CSJU-GAM-SFWA-2008-001) financed by the 7th Framework Program of European Commission. The authors would like to thank the partners of the project for their collaboration and fruitful discussions. The authors are grateful to ONERA/GMT F2 wind tunnel team J.M. Deluc, T. Joret and P. Loiret for their technical support during the experimental campaign in F2 wind tunnel. The authors would also like to warmly thank F. Ternoy and G. Outtier who manufactured the ACD. Special thanks are given to D. Arnal and A. Séraudie who initiated this study and performed the first wind tunnel campaign in 2010 (they well deserved their retirement).

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Authors and Affiliations

  1. ONERA - The French Aerospace Lab, Toulouse, 31055, France

    M. Fiore, O. Vermeersch, M. Forte, G. Casalis & C. François

  2. Aerodynamics and Energetics Modelling Department, ONERA, 2 Avenue Edouard Belin, Toulouse, 31055, France

    M. Fiore, O. Vermeersch, M. Forte & G. Casalis

  3. Applied Aerodynamics Department, ONERA, 8 rue des Vertugadins, Meudon, 92190, France

    C. François

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  1. M. Fiore
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  2. O. Vermeersch
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  3. M. Forte
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  4. G. Casalis
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  5. C. François
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Correspondence to O. Vermeersch.

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Fiore, M., Vermeersch, O., Forte, M. et al. Characterization of a highly efficient chevron-shaped anti-contamination device. Exp Fluids 57, 59 (2016). https://doi.org/10.1007/s00348-016-2149-1

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  • DOI: https://doi.org/10.1007/s00348-016-2149-1

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