In the framework of the AIM project the near field of the blade tip vortex of a full-scale helicopter in simulated hover flight was investigated by combining three-component Particle Image Velocimetry and Background Oriented Schlieren measurements. The velocity field measurements in the range of wake ages of ψ v = 1 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\uppsi _{\mathrm{{v}}}={1}^\circ }$$\end{document} to 30 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${30}^\circ $$\end{document} in azimuth provided a reference for a quantitative analysis of the Schlieren results yielding vortex core density estimates. Ongoing vortex roll-up was observed at ψ v = 1 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\uppsi _{\mathrm{{v}}}={1}^\circ }$$\end{document} while considerable aperiodicity was persistent thereafter. The vortex parameters for ψ v > 1 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\uppsi _{\mathrm{{v}}}>{1}^\circ }$$\end{document} were consistent with the Scully vortex model. The particular challenges of full-scale, outdoor testing, especially the limited spatial resolution and aperiodicity effects, resulted in elevated measurement uncertainty as compared to sub-scale experiments.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Towards In-Flight Measurements of Helicopter Blade Tip Vortices


    Weitere Titelangaben:

    Research Topics in Aerospace


    Beteiligte:
    Boden, Fritz (Herausgeber:in) / Lawson, Nicholas (Herausgeber:in) / Jentink, Henk W. (Herausgeber:in) / Kompenhans, Jürgen (Herausgeber:in) / Kindler, Kolja (Autor:in) / Mulleners, Karen (Autor:in) / Raffel, Markus (Autor:in)


    Erscheinungsdatum :

    2013-02-14


    Format / Umfang :

    15 pages





    Medientyp :

    Aufsatz/Kapitel (Buch)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Special vortices at a helicopter rotor blade

    Müller, R.H.G. | Tema Archiv | 1990



    Application of stereoscopic PIV to helicopter rotor blade tip vortices

    Kato, H. / Watanabe, S. / Kondo, N. et al. | IEEE | 2003


    Application of Stereoscopic PIV to Helicopter Rotor Blade Tip Vortices

    Kato, H. / Watanabe, S. / Kondo, N. et al. | British Library Conference Proceedings | 2003