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Inverted velocity profile semi-annular nozzle jet exhaust noise experiments
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Goodykoontz, J. H. |
| Copyright Year | 1983 |
| Description | Experimental noise data are shown for a conical nozzle with a semi-annular secondary flow passage having secondary to primary velocity ratios ranging from 1.0 to 1.4. Spectral data are presented at different directivity angles in the flyover plane with the semi-annular flow passage located either on the same side or opposite side relative to an observer. A 10.0 cm diameter primary conical nozzle was used with a 2.59 cm and 5.07 cm wide annular gap secondary nozzle. Similar trends were observed for both nozzle configurations. In general, near the peak noise location and at velocity ratios greater than 1.0, noise levels were larger on the side where the secondary passage was closest to an observer. At velocity ratios near 1.0 the opposite was true. When compared to predicted noise levels for a conical nozzle alone operating at the same ideal thrust, the semi-annular configuration showed no benefit in terms of noise attenuation. |
| File Size | 1364060 |
| Page Count | 28 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19840005856 |
| Archival Resource Key | ark:/13960/t3tt9fr5d |
| Language | English |
| Publisher Date | 1983-12-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Conical Nozzles Effective Perceived Noise Levels Exhaust Nozzles Nozzle Flow Jet Aircraft Noise Multiphase Flow Noise Reduction Annular Nozzles Flow Velocity Secondary Flow Noise Spectra Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
