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The acoustics of a small-scale helicopter rotor in hover
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Kitaplioglu, Cahit |
| Copyright Year | 1989 |
| Description | A 2.1 m diameter, 1/6-scale model helicopter main rotor was tested in hover in the test section of the NASA Ames 40- by 80-foot wind tunnel. Performance and noise data on a small-scale rotor at various thrust coefficients and tip Mach numbers were obtained for comparison with existing data on similar full-scale helicopter rotors. These data form part of a data base to permit the estimation of scaling effects on various rotor noise mechanisms. Another objective was to contribute to a data base that will permit the estimation of facility effects on acoustic testing. Acoustic 1/3-octave-band spectra are presented, together with variations of overall acoustic levels with rotor performance, microphone distance, and directivity angle. |
| File Size | 2555237 |
| Page Count | 96 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19890016583 |
| Archival Resource Key | ark:/13960/t8hf2r348 |
| Language | English |
| Publisher Date | 1989-04-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Performance Tests Scale Models Scale Effect Aerodynamic Noise Noise Measurement Hovering Noise Spectra Data Bases Rotary Wings Tip Speed Microphones Wind Tunnel Tests Wind Tunnel Calibration Thrust Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
