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.
PIV Measurements of a Low-noise Top-mounted Propulsion Installation for a Supersonic Airliner
AIAA Science and Technology Forum and Exposition (SciTech) ; 2019 ; San Diego, CA, United States
2019-01-07
Aufsatz (Konferenz)
Keine Angabe
Englisch