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- W2000308904 abstract "The concept of quadrupoles, introduced by Lighthill in his theory of aerodynamically generated noise, was a new one to many investigators in acoustics and aerodynamics. Thus in some cases the nature of the quadrupole field and its origin have been misunderstood or misrepresented mathematically. In addition it is often forgotten that Lighthill's integral expression for the density fluctuation is an integral equation, because the unknown density is contained in the integral; when the average value of the density in the jet is used inside the integral, one obtains only a first approximation to the exact result. This latter point may not be important in the study of far-field noise from turbulence in a jet at low Mach numbers, but if the Mach number is high or if it is the near field that is to be studied these considerations become important. For example, in jets with velocity near Mach-one, the interaction between the jet structure and the near field of the quadrupoles cannot be neglected. This contributes another to the many correction terms of the order of M2 (which are compared for possibilities of mutual cancellation.) The complications arising in the quadrupole description of noise from jets with velocity near Mach-one make attractive any possible model using monopole or dipole sources. (This research was supported by the U. S. Air Force, Wright Air Development Division.)" @default.
- W2000308904 created "2016-06-24" @default.
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- W2000308904 date "1960-11-01" @default.
- W2000308904 modified "2023-10-16" @default.
- W2000308904 title "Near and Far Fields of Multipoles and Jet Noise" @default.
- W2000308904 doi "https://doi.org/10.1121/1.1936349" @default.
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