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- W2010203480 abstract "Introduction A GOOD deal of experimental and analytical research has been directed at the behavior of excited jets.' From an aeroacoustic point of view, these jets appear to point toward an avenue of noise reduction. Although Bechert and Pfizenmaier reported a pronounced broadband lift of the radiated sound for excitation at the preferred Strouhal frequency (St=f0D/Uj = 0.5), Moore measured small reductions when the jet was driven at nondimensional frequencies well above 0.5. The work of Kibens suggests the possibility of significant reduction in the broadband noise; this is explored further herein. Measurements of certain length and time scales are presented. The results are applied to a simple analytical model of jet noise generation. Using explicit information about the spatial and temporal scales an effective source strength distribution is inferred, permitting (in principle) computation of the overall sound pressure level. The measurements presented here suggest that only marginal reductions in broadband noise can be realized for jets operated at modest and high Reynolds numbers (Re> 300,000)." @default.
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- W2010203480 date "1983-01-01" @default.
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- W2010203480 title "Length and time scales relevant to sound generation in excited jets" @default.
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- W2010203480 doi "https://doi.org/10.2514/3.8043" @default.
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