| タイトル | Lateral noise attenuation of the advanced propeller of the propfan test assessment aircraft |
| 著者（英） | Chambers, F. W.; Reddy, N. N.; Bartel, H. W. |
| 著者所属（英） | Lockheed Aeronautical Systems Co. |
| 発行日 | 1989-04-01 |
| 言語 | eng |
| 内容記述 | Lateral noise attenuation characteristics of the advanced propeller are determined using the flight test results of the testbed aircraft, Propfan Test Assessment (PTA), with a single, large-scale propfan. The acoustic data were obtained with an array of ground-mounted microphones positioned at distances up to 2.47 km (8100 feet) to the side of the flight path. The aircraft was flown at a Mach number of 0.31 for a variety of operating conditions. The lateral noise attenuation in a frequency range containing the blade passage frequency of the propeller was found to have positive magnitudes on the propfan side and negative magnitudes on the opposite side. The measured attenuation exhibits a strong dependence upon the elevation angle. The results also display a clear dependence upon the angle at which the propeller and nacelle are mounted on the wing (inflow angle). |
| NASA分類 | ACOUSTICS |
| レポートNO | 89A36217
AIAA PAPER 89-1057 |
| 権利 | Copyright |
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