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Quiet high-speed fan
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Weir, Donald S. Repp Sr., Russ Lieber, Lysbeth |
| Copyright Year | 1996 |
| Description | A calibration of the acoustic and aerodynamic prediction methods was performed and a baseline fan definition was established and evaluated to support the quiet high speed fan program. A computational fluid dynamic analysis of the NASA QF-12 Fan rotor, using the DAWES flow simulation program was performed to demonstrate and verify the causes of the relatively poor aerodynamic performance observed during the fan test. In addition, the rotor flowfield characteristics were qualitatively compared to the acoustic measurements to identify the key acoustic characteristics of the flow. The V072 turbofan source noise prediction code was used to generate noise predictions for the TFE731-60 fan at three operating conditions and compared to experimental data. V072 results were also used in the Acoustic Radiation Code to generate far field noise for the TFE731-60 nacelle at three speed points for the blade passage tone. A full 3-D viscous flow simulation of the current production TFE731-60 fan rotor was performed with the DAWES flow analysis program. The DAWES analysis was used to estimate the onset of multiple pure tone noise, based on predictions of inlet shock position as a function of the rotor tip speed. Finally, the TFE731-60 fan rotor wake structure predicted by the DAWES program was used to define a redesigned stator with the leading edge configured to minimize the acoustic effects of rotor wake / stator interaction, without appreciably degrading performance. |
| File Size | 4312371 |
| Page Count | 96 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19970009366 |
| Archival Resource Key | ark:/13960/t88h3jr5p |
| Language | English |
| Publisher Date | 1996-11-01 |
| Access Restriction | Open |
| Subject Keyword | Air Transportation And Safety Engine Noise Computational Fluid Dynamics Noise Reduction Rotors Rotor Aerodynamics Tip Speed Sound Pressure Turbofans Flow Distribution Far Fields Stators Turbofan Engines Aeroacoustics Leading Edges Noise Prediction 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 |
