This paper concerns a collaborative research work between DLR of Göttingen and LABM of Marseille which aims to create a new experimental data base characterizing the tilt-rotor wake and the associated vortex structures. This study will provide detailed flow data on the aerodynamic interactions causes which occur on a tilt-rotor aircraft including a rotor, a nacelle, a fixed wing and an end plate simulating the fuselage. Experiments have been performed in the LABM S1L wind-tunnel at 3 different flight configurations which correspond to hover, conversion and cruise flights. The stereoscopic PIV system generates an illuminating laser sheet in a Z-plane normal to the uniform free stream velocity U8. PIV measurements have been performed at different Z-planes distributed at different distance downstream the rotor (in the wake region between the rotor and the wing and above the fixed wing) in both the conversion and cruise flight configurations and for different parametric conditions of the rotor shaft angle (b), the blade rotational frequency (f), the upstream velocity (U8), the advancing parameter (m=U8 /2pfR) and the collective pitch angle value (q). For these different parametric conditions the tip vortex path and the associated 3C velocity field shed from the blade have been determined in the early stages of the tip vortex shedding corresponding to 3 azimuth positions (y=1 deg., 2 deg., 5 deg.) and in a fixed downstream plane located at Z/R=0. The XY-plots of the velocity vector clearly show the flow perturbation generated by the blade passage and the vortex development and propagation from the tip of the emitting blade. Moreover, from such PIV measurements performed at different downstream distances from the rotor and at different blade azimuth positions the tip vortex paths have been reconstructed both in the wake region between the rotor and the wing and above the wing surface. The wake data provide a better understanding on both the vortex dynamics and the behaviour of vortical structures interacting with the wing on a tilt-rotor configuration.


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    Title :

    PIV measurements of the vortical wake behind tilt-rotor blades




    Publication date :

    2006


    Size :

    12 Seiten, 10 Bilder, 1 Tabelle, 14 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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