| タイトル | Scaling of helicopter main rotor noise in hover |
| 著者（英） | Kitaplioglu, C. |
| 著者所属（英） | NASA Ames Research Center |
| 発行日 | 1986-01-01 |
| 言語 | eng |
| 内容記述 | A 2.1-m-diam, one-sixth-scale model helicopter main rotor was tested in hover at the NASA Ames Outdoor Aerodynamic Research Facility. It had previously been tested in hover in the NASA Ames 40- by 80-Foot Wind Tunnel test section. The primary objective of the tests was to obtain acoustic and performance data on a medium-scale rotor at various thrust coefficients and tip Mach numbers to compare to similar existing data on a full-scale helicopter main rotor. Information is presented on the effects of thrust- and tip-speed variation, the effects of boundary-layer trip strips, and the effects of wind conditions. In addition, a preliminary evaluation of the scaling of helicopter main-rotor noise in hover is presented. A secondary objective was to contribute to a data base that will permit the estimation of facility effects on acoustic testing. |
| NASA分類 | ACOUSTICS |
| レポートNO | 86A22699
AIAA PAPER 86-0393 |
| 権利 | Copyright |
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