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Effects of forward velocity and acoustic treatment on inlet fan noise
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Feiler, C. E. Merriman, J. E. |
| Copyright Year | 1974 |
| Description | Flyover and static noise data from several engines are presented that show inlet fan noise measured in flight can be lower than that projected from static tests for some engines. The differences between flight and static measurements appear greatest when the fan fundamental tone due to rotor-stator interaction or to the rotor alone field is below cutoff. Data from engine and fan tests involving inlet treatment on the walls only are presented that show the attenuation from this treatment is substantially larger than expected from previous theories or flow duct experience. Data showing noise shielding effects due to the location of the engine on the airplane are also presented. These observations suggest that multiringed inlets may not be necessary to achieve the desired noise reduction in many applications. |
| File Size | 902517 |
| Page Count | 26 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19740022136 |
| Archival Resource Key | ark:/13960/t49p7tg0f |
| Language | English |
| Publisher Date | 1974-01-01 |
| Access Restriction | Open |
| Subject Keyword | Propulsion Systems Flight Tests Statistical Analysis Noise Reduction Aircraft Noise Rotor Stator Interactions Engine Inlets Stator Blades Engine Tests Aircraft Engines Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
