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Static and wind tunnel near-field/far-field jet noise measurements from model scale single-flow base line and suppressor nozzles. summary report. [conducted in the boeing large anechoic test chamber and the nasa-ames 40by 80-foot wind tunnel
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Jaeck, C. L. |
| Copyright Year | 1977 |
| Description | A test program was conducted in the Boeing large anechoic test chamber and the NASA-Ames 40- by 80-foot wind tunnel to study the near- and far-field jet noise characteristics of six baseline and suppressor nozzles. Static and wind-on noise source locations were determined. A technique for extrapolating near field jet noise measurements into the far field was established. It was determined if flight effects measured in the near field are the same as those in the far field. The flight effects on the jet noise levels of the baseline and suppressor nozzles were determined. Test models included a 15.24-cm round convergent nozzle, an annular nozzle with and without ejector, a 20-lobe nozzle with and without ejector, and a 57-tube nozzle with lined ejector. The static free-field test in the anechoic chamber covered nozzle pressure ratios from 1.44 to 2.25 and jet velocities from 412 to 594 m/s at a total temperature of 844 K. The wind tunnel flight effects test repeated these nozzle test conditions with ambient velocities of 0 to 92 m/s. |
| File Size | 3486041 |
| Page Count | 106 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19770019196 |
| Archival Resource Key | ark:/13960/t2r54f056 |
| Language | English |
| Publisher Date | 1977-06-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Jet Aircraft Noise Annular Nozzles Far Fields Wind Tunnel Tests Near Fields Noise Measurement Suppressors Nozzle Efficiency Convergent Nozzles 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 |
