A model-scale exhaust system was tested to validate low-noise propulsion concepts and noise prediction methods. The tests involved far-field acoustics, phased array, and particle image velocimetry (PIV). This paper covers the particle image velocimetry portion. Data was acquired at NASA Glenn's Aero-Acoustic Propulsion Lab for a series of nozzles with different chevron designs, both uninstalled and installed on a representative aircraft planform. The impact of the various chevron treatments on the turbulent velocity field was documented, along with the impact of the pylon and planform. When correlated with far-field acoustic measurements and phased array measurements, reported in companion papers, the explanation of acoustic benefits from top-mounted propulsion is clear as is the path toward optimization of the concept.


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    Title :

    PIV Measurements of a Low-noise Top-mounted Propulsion Installation for a Supersonic Airliner


    Contributors:

    Conference:

    AIAA Science and Technology Forum and Exposition (SciTech) ; 2019 ; San Diego, CA, United States


    Publication date :

    2019-01-07


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English