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Propeller tone bursts |
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| Authors: | G.P. Succi D.H. Munro K.U. Ingard |
| Affiliation: | Bolt Beranek and Newman Inc., 50 Moulton Street, Cambridge, Massachusetts 02238, U.S.A.;Lawrence Livermore Laboratories, Livermore, California, U.S.A.;Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, U.S.A. |
| Abstract: | Intense high frequency (25–38 kHz) tone bursts have been observed in acoustic tests of a scale model of a general aviation propeller. The amplitude of the tone burst is approximately equal to the amplitude of the propeller noise signature. The conditions necessary for the production of these tone bursts are described. The experiments indicate that the origin of these bursts is a periodic flow oscillation on the suction surface of the propeller blade tips which may be due to the interaction between an oscillating shock wave and a laminar boundary layer. |
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