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An empirical model for inverted-velocity-profile jet noise prediction

Author
Stone, J. R.
Published
JAN 1, 1977.
Physical Description
1 electronic document
Online Version

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Summary
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 considered 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 noise from the merged region occurs at relatively low frequency and is modeled as the contribution of a circular jet at merged conditions and total exhaust area, with the high frequencies attenuated. The noise from the premerged region occurs at high frequency and is modeled as the contribution of an equivalent plug nozzle at outer stream conditions, with the low frequencies attenuated.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19780005118.
Accession ID: 78N13061.
E-9425.
NASA-TM-73838.
Meeting of the Acoustical Soc. of Am.; 13-16 Dec. 1977; Miami, FL; United States.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15730481