Aerodynamics. — On the transmission of sound waves through a shock wave

Abstract

The problem considered in the following pages is related to the one treated in a paper on the propagation of certain pressure disturbances in an ideal gas ¹). As in that paper wave propagation in one dimension only is considered, while it is assumed that the gas carrying and heat radiation being neglected. It was shown in the paper mentioned that when two shock waves meet, or when a schock wave is met by an expansion wave, special frontiers will appear at which there is a change of the entropy of the gas. It will be the object of the present lines to show that a similar phenomenon occurs when a shock wave is met by sound waves.