Experimental and numerical acoustic results for Pitot tubes are presented to explore the theoretical basis for an acoustic blockage-detection system. Three Pitot-statics from two different commercial aircraft were computed-tomography scanned to determine their internal geometry, and a finite element acoustic study was performed to determine the variation between blocked and unblocked reflected acoustic waves when subjected to a sinusoidal input. To validate this, supporting experiments were conducted on the same tubes when subjected to a range of blockage types, including tape, predeceased insects, foam, and metal. Experimental and numerical results confirm acoustic detection of all tested blockages is feasible in a quiet environment, for both the total and static pressure measurements, but only if the pressure line forms a clean waveguide along its length. The frequency range for detection is specific to each of the two Pitot designs, but a common feature is that the blocked/unblocked variation diminishes as frequency is raised due to an increase of impedance with frequency. A current limitation of the method is that it has not yet been shown to be operable in flight.


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    Titel :

    Acoustic Reflectometry for Pitot-Tube Blockage Detection


    Beteiligte:
    Rodrigues, J. (Autor:in) / Grey, S. (Autor:in) / Azarpeyvand, M. (Autor:in) / Rendall, T. C. S. (Autor:in)

    Erschienen in:

    Journal of Aircraft ; 55 , 1 ; 325-338


    Erscheinungsdatum :

    2017-08-29


    Format / Umfang :

    14 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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