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- W2014789721 abstract "The theoretical optimum acoustic impedance for higher order spinning modes was studied in cylindrical ducts with a boundary layer at the outer edge of a uniform flow. All of the propagating modes were considered from highly propagating to nearly cut-off. It was observed that the mode cut-off ratio uniquely determined the optimum wall impedance and maximum possible attenuation for a given boundary layer thickness, Mach number and frequency. The implications of this phenomenon are quite important in noise suppressor design. Instead of the acoustic power distribution among all of the propagating modes, only the power distribution as a function of cut-off ratio needs to be known. Also, the far field radiation pattern is a function of modal cut-off ratio, and much needed information for liner design can be obtained from these more easily obtained data." @default.
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- W2014789721 date "1976-07-20" @default.
- W2014789721 modified "2023-09-25" @default.
- W2014789721 title "Acoustic liner optimum impedance for spinning modes with mode cut-off ratio as the design criterion" @default.
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- W2014789721 doi "https://doi.org/10.2514/6.1976-516" @default.
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