Abstract
Holographic techniques have been used to obtain three-dimensional visualizations of the noise field generated by a cold supersonic turbulent jet. Double exposure holographic interferograms of an underexpanded jet display conical fringes emanating from the jet, which are believed to be Mach wavefronts. These fronts appear to originate at disturbances on the core of the jet. Measurements of Mach angles indicate that the predominant convection velocity of the disturbances is approximately 80% of the jet velocity.
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