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- W3034997955 abstract "A series of numerical and experimental studies were made to take a fresh look at how a mixer-ejector exhaust system might provide noise reduction for the landing and takeoff operation of a commercial supersonic vehicle. Historical understanding of aerodynamic and acoustic behaviors were updated and employed to design candidate nozzle systems. New CFD-based noise prediction tools, applied to conceptual designs, predicted noise reductions of 3-5EPNdB for a few percent thrust loss. Complementary experiments confirmed some key insights, established accuracy of thrust calculations, and corroborated general acoustic trends. Experiments, however, showed where the conventional acoustic understanding of mixer-ejectors is missing several complications to the acoustic theory, most critically an intrinsic unsteadiness in ejector flows. This unsteadiness often resulted in ejectors that were substantially louder than a nozzle without ejector, not quieter. The paper concludes with recommendations for future work in mixer-ejectors which will be required if their promise is to be fulfilled." @default.
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- W3034997955 date "2020-06-08" @default.
- W3034997955 modified "2023-09-23" @default.
- W3034997955 title "Basics of Mixer-Ejectors for Quiet Propulsion" @default.
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- W3034997955 doi "https://doi.org/10.2514/6.2020-2505" @default.
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