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- W2068014037 abstract "An analytical model of the unsteady pressure field of subsonic and moderately supersonic jets has been derived. It is valid in the nearfield as well as the farfield of the jet flow and based on Lighthill's theory of aerodynamic noise. Instead of the usual farfield approximations, the full solution incorporating the nonradiating pseudosound field is used. The equivalent sources of sound are quadrupoles of random strength and orientation. Their statistics are described by a locally homogeneous isotropic turbulence model with realistic length and time scales. The formalism “predicts” realistic power spectral densities as well as intensities of the unsteady pressure. The nearfield is dominated by intense low-frequency “pseudosound,” the propagating acoustic waves making negligible contribution. If the observation point is moved away from the flow, the predicted power spectral densities approach the asymptotic farfield solution. This allows one to deduce the least separation at which “farfield measurements” are possible. [Work supported by NSERC and University of Toronto.]" @default.
- W2068014037 created "2016-06-24" @default.
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- W2068014037 date "1981-11-01" @default.
- W2068014037 modified "2023-09-26" @default.
- W2068014037 title "Acoustic nearfield of an axisymmetric jet" @default.
- W2068014037 doi "https://doi.org/10.1121/1.2018660" @default.
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