Abstract
An experimental demonstration of the influence of fluid motion in a duct on the sound-pressure field radiated in the upstream and downstream directions from a stationary sound source is presented. The ratio between the upstream and downstream sound-pressure amplitudes is obtained as a function of the flow Mach number in the range M=0–0.5. The results are discussed in the light of a mathematical analysis of the problem. An observed irregularity in the Mach number dependence of the pressure ratio is interpreted as a result of a flow transition which in effect alters the boundary conditions at the source. [This work was supported by the U. S. Navy (Office of Naval Research) under Contract N00014-67-A-0204-0019.]
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