Abstract
The general equations of sound propagation in and through moving media have been studied previously by Blokhintzev, Rudnick and others. Transmission from a stationary medium to a moving one is particularly interesting if one allows not only subsonic but also supersonic flow velocities. Then additional critical angles and double refraction of sound may occur. In addition to this problem other examples of interaction of sound with flow in simple geometries will be considered. This work was supported in part by the NACA and the Office of Naval Research.
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