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Inlet shape effects on the far-field sound of a model fan
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Thomas, R. H. Clark, L. R. Gerhold, C. H. Dougherty, R. P. Farassat, F. |
| Copyright Year | 1997 |
| Description | A wind tunnel test was conducted to determine the effects of inlet shape on fan radiated noise. Four inlet geometries, which included a long standard flight type inlet, a short, aggressive flight inlet a scarf inlet, and an elliptical inlet were investigated in the study. The fan model used in the study was a 0.1 scale of the Pratt and Whitney Advanced Ducted Propeller (ADP), an ultra high bypass ratio turbofan engine. Acoustic data are presented for a fan speed of 70% (12,000 rpm) and a tunnel speed of 0.10 Mach number, The fan was configured with a 16-bladed rotor and a 40 stator vane set that were separated by 2.0 chord lengths. The radiated noise was measured with 15 microphones on a boom that traversed the length of the tunnel test section. Data from these microphones are presented in the form of sideline angle directivity plots. Noise associated with the test inlets was also predicted using a ray acoustics code. Inlet shape has been found to have a significant effect on both tone and broadband noise, and the non-axisymmetric inlet shape can be used for a noise reduction method. |
| File Size | 1293260 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19970022279 |
| Archival Resource Key | ark:/13960/t5gb71j63 |
| Language | English |
| Publisher Date | 1997-01-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Bypass Ratio Noise Reduction Geometrical Acoustics Aerodynamic Noise Fan Blades Microphones Acoustic Properties Test Chambers Shrouded Propellers Far Fields Vanes Stators Wind Tunnel Tests Turbofan Engines 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 | Article |
