Analysis of internally generated sound in continuous materials: 2. A critical review of the conceptual adequacy and physical scope of existing theories of aerodynamic noise, with special reference to supersonic jet noise

Abstract

Existing theories of aerodynamic noise generation are critically reviewed with special emphasis on conceptual adequacy and physical scope, and with special reference to supersonic jet noise. In this review the basic work of Stokes, Kirchoff and Rayleigh on fluctuating motions in fluids is recalled and developed to provide a firm basis for the critique. The advantages and disadvantages of acoustic analogy theories such as Lighthill's are thoroughly discussed. A contribution is made towards removing published criticisms by Lighthill of Ribner's “isotropic source tensor” theory. New developments, such as those by Crow, Lilley and Doak, are emphasized.