摘要：

This paper gives a simple, unified, analytical description of a wide range of mechanisms associated with the generation of sound by unsteady fluid motion. Topics treated include radiation from compact and non-compact multipole sources, Lighthill's theory of sound emission from free turbulence, effects of source convection, sound generation from flow interaction with solid surfaces and inhomogeneities of the medium, and singular perturbation aspects of the aerodynamic sound problem. The concluding section discusses several areas of current interest and importance, including noise generation by supersonic shear layers, shallow water wave simulation of flow noise, the excess-noise problem, and the general issues bound up with shear layer and jet instability and the orderly structure of turbulent jets.

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