Loading...
Please wait, while we are loading the content...
Similar Documents
Forward velocity effects on fan noise and the suppression characteristics of advanced inlets as measured in the nasa ames 40 by 80 foot wind tunnel: acoustic data report
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Moore, M. T. |
| Copyright Year | 1981 |
| Description | Forward velocity effects on the forward radiated fan noise and on the suppression characteristics of three advanced inlets relative to a baseline cylindrical inlet were measured in a wind tunnel. A modified JT15D turbofan engine in a quiet nacelle was the source of fan noise; the advanced inlets were a CTOL hybrid inlet, an STOL hybrid inlet, and a treated deflector inlet. Also measured were the static to flight effects on the baseline inlet noise and the effects on the fan noise of canting the baseline inlet 4 deg downward to simulate typical wing mounted turbofan engines. The 1/3 octave band noise data from these tests are given along with selected plots of 1/3 octave band spectra and directivity and full scale PNL directivities. The test facilities and data reduction techniques used are also described. |
| File Size | 32297394 |
| Page Count | 263 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19810010272 |
| Archival Resource Key | ark:/13960/t1ng9g57m |
| Language | English |
| Publisher Date | 1981-01-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Airspeed Engine Noise Noise Reduction Engine Inlets Wind Tunnel Tests Turbofan Engines Deflectors Noise Measurement Data Reduction Noise Spectra Sound Pressure 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 |
