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- W3167854432 abstract "This paper reports the results of an experimental investigation on the effect of impingement tones generated by obstacles of various geometries on the spreading of a supersonic jet flow. A rectangular supersonic jet was produced using a convergent-divergent nozzle that was operated near its design point (with shocks minimized). The immersion of obstacles in the flow produced an intense impingement tone which then propagated upstream (as feedback) to the jet lip and excited the antisymmetric hydrodynamic mode in the jet, thus setting up a resonant self-sustaining loop. The violent flapping motion of the jet due to excitation of the antisymmetric mode, combined with the unsteady wakes of the obstacles, produced large changes in jet mixing. It was possible to control the frequency and amplitude of the impingement tone excitation by varying the nozzle-to-obstacle distance and the obstacle immersion. By proper shaping of the obstacles it was possible to reduce the thrust penalty significantly." @default.
- W3167854432 created "2021-06-22" @default.
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- W3167854432 date "1994-06-27" @default.
- W3167854432 modified "2023-09-24" @default.
- W3167854432 title "Mixing and noise benefit versus thrust penalty in supersonic jets using impingement tones" @default.
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- W3167854432 doi "https://doi.org/10.2514/6.1994-2955" @default.
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