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An evaluation of some alternative approaches for reducing fan tone noise
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Woodward, Richard P. Dittmar, James H. |
| Copyright Year | 1992 |
| Description | The potential of two alternative approaches for reducing fan ton noise was investigated in this study. One of these approaches increases the number of rotor blades to shift the tone noise to higher frequencies that are not rated as strongly by the perceived noise scale. This alternative fan also would have a small number of long chord stator vanes which would reduce the stator response and lower rotor-stator interaction noise. Comparison of the conventional and alternative fan concepts showed that this alternative approach has as large or larger a perceived tone noise reduction potential as the conventional approach. The other alternative, a high Mach number inlet, is evaluated both for its noise attenuation and for its change in noise directivity. |
| File Size | 9954350 |
| Page Count | 21 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19920009040 |
| Archival Resource Key | ark:/13960/t1hj1fd5s |
| Language | English |
| Publisher Date | 1992-02-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Engine Noise Noise Reduction Aircraft Noise Turbofans Rotor Stator Interactions Engine Inlets Stators Vanes Aerodynamic Noise Turbofan Engines Fan Blades Mach Number 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 |
