Loading...
Please wait, while we are loading the content...
Similar Documents
Forward acoustic performance of a shock-swallowing high-tip-speed fan (qf-13)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Lucas, J. G. Mackinnon, M. J. Woodward, R. P. |
| Copyright Year | 1980 |
| Description | Forward noise and overall aerodynamic performance data are presented for a high-tip-speed fan having rotor blade airfoils designed to alter the conventional leading-edge bow shocks to weak, oblique shocks which are swallowed within the interblade channels. It was anticipated that the swallowed shocks would minimize the generation of multiple-pure-tone noise. In the speed range where the shocks presumably were swallowed, the multiple-tone noise was lowered only about 3 decibels. Comparison with several high-speed fans on a thrust-corrected basis indicates that the present fan was the quietest in total forward noise at low speeds but offered no advantage at high speeds. |
| File Size | 1513355 |
| Page Count | 21 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19800014611 |
| Archival Resource Key | ark:/13960/t5bc8sc7x |
| Language | English |
| Publisher Date | 1980-05-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Shock Wave Attenuation Blade Tips Acoustic Measurement Noise Reduction Rotor Aerodynamics Rotor Speed Inlet Flow Noise Spectra Anechoic Chambers Airfoil Profiles Turbofans Aerodynamic Characteristics Graphs Charts 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 |
