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Acoustic performance of an advanced model turbofan in three aeroacoustic test facilities
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Woodward, Richard P. Hughes, Christopher E. |
| Copyright Year | 2012 |
| Description | A model advanced turbofan was acoustically tested in the NASA Glenn 9- by 15-Foot-Low-Speed Wind Tunnel (LSWT), and in two other aeroacoustic facilities. The Universal Propulsion Simulator (UPS) fan was designed and manufactured by the General Electric Aircraft Engines (GEAE) Company, and featured active core, as well as bypass, flow paths. The reference test configurations were with the metal, M4, rotor with hardwall and treated bypass flow ducts. The UPS fan was tested within an airflow at a Mach number of 0.20 (limited flow data were also acquired at a Mach number of 0.25) which is representative of aircraft takeoff and approach conditions. Comparisons were made between data acquired within the airflow (9x15 LSWT and German-Dutch Wind Tunnel (DNW)) and outside of a free jet (Boeing Low Speed Aero acoustic Facility (LSAF) and DNW). Sideline data were acquired on an 89-in. (nominal 4 fan diameters) sideline using the same microphone assembly and holder in the 9x15 LSWT and DNW facilities. These data showed good agreement for similar UPS operating conditions and configurations. Distortion of fan spectra tonal content through a free jet shear layer was documented, suggesting that in-flow acoustic measurements are required for comprehensive fan noise diagnostics. However, there was good agreement for overall sound power level (PWL) fan noise measurements made both within and outside of the test facility airflow. |
| File Size | 2092655 |
| Page Count | 63 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20120011144 |
| Archival Resource Key | ark:/13960/t3421zn01 |
| Language | English |
| Publisher Date | 2012-06-01 |
| Access Restriction | Open |
| Subject Keyword | Aeronautics (general) Test Facilities Acoustic Measurement Noise Reduction Low Speed Wind Tunnels Fan Blades Aircraft Models Shear Layers Free Jets Air Flow Turbofans Wind Tunnel Tests Simulators Aeroacoustics 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 |
