Methods and results are described for flight-test measurements of the aero-optical effect of the near-field flow surrounding a medium-sized helicopter in hover. The data were acquired using a novel, passive measurement approach in which optical wave-front aberrations were computed from the displacements of light-emitting diodes attached to a target array mounted under the helicopter fuselage. The resulting aero-optical data are shown through the rotor downwash and through the engine exhaust of the helicopter, and they are compared to estimates computed using parametric models for the helicopter wake structure and rotor–vortex diffusion. The experimental data provide additional information on the magnitude and frequency content of the aero-optical aberrations, as well as vibration data, that will be valuable for future beam-control and modeling studies.


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    Titel :

    Flight-Test Measurement of the Aero-Optical Environment of a Helicopter in Hover


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 54 , 9 ; 2782-2790


    Erscheinungsdatum :

    2016-07-12


    Format / Umfang :

    9 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






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    The Aero-Optical Environment of a Helicopter in Forward Flight

    Porter, Christopher / Rennie, Mark / Jumper, Eric | AIAA | 2011