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Characteristics of an anechoic chamber for fan noise testing
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Essary, J. D. Shaw, L. M. Wuzyniak, J. A. |
| Copyright Year | 1977 |
| Description | Acoustical and mechanical design features of NASA Lewis Research Center's engine fan noise facility are described. Acoustic evaluation of the chamber, which is lined with an array of stepped wedges, is described. Results from the evaluation in terms of cut-off frequency and non-anechoic areas near the walls are detailed. Fan models are electrically driven to 20,600 RPM in either the inlet mode or exhaust mode to facilitate study of both fore and aft fan noise. Inlet noise characteristics of the first fan tested are discussed and compared to full-scale levels. Turbulence properties of the inlet flow and acoustic results are compared with and without a turbulence reducing screen over the fan inlet. |
| File Size | 3292840 |
| Page Count | 33 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19770011224 |
| Archival Resource Key | ark:/13960/t22c3t33m |
| Language | English |
| Publisher Date | 1977-01-01 |
| Access Restriction | Open |
| Subject Keyword | Research And Support Facilities (air) Anechoic Chambers Turbulent Flow Acoustic Measurement Engine Noise Propeller Fans Engine Inlets Inlet Flow Mechanical Engineering Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
