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- W2080592076 abstract "An empirical model for predicting the noise from inverted velocity-profile coaxial or coannular jets is presented and compared with small-scale static and simulated-flight data. The model considers the combined contributions of as many as four uncorrelated constituent sources: the premerged-jet/ambient mixing region, the merged-jet/ambient mixing region, outer-stream shock/turbulence interaction, and inner-stream shock/turbulence interaction. The model for both mixing regions is developed from the NASA interim prediction method for jet noise. The noise from the merged region occurs at relatively low frequency and is modeled as the contribution of a circular jet at merged conditions (between inner and outer streams) and total exhaust area, with the high frequencies attenuated (since the high-frequency region of this fictitious jet does not exist). The noise from the premerged region occurs at higher frequency and is modeled as the contribution of an equivalent plug nozzle at outer stream conditions, with the low frequencies attenuated (since the outer jet is broken up rapidly, before much low frequency is generated). The shock noise for each supersonic stream is calculated from a modification of the Harper-Bourne and Fisher (1973) model." @default.
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- W2080592076 date "1977-12-01" @default.
- W2080592076 modified "2023-09-27" @default.
- W2080592076 title "Empirical model for inverted‐velocity‐profile jet noise prediction" @default.
- W2080592076 doi "https://doi.org/10.1121/1.2016401" @default.
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