Shadowgraph Visualization of Jet Noise

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Abstract
Shadowgraph visualization of supersonic jet flows can reveal both the flow structure and acoustic field of the jet. The acoustic field takes the form either of Mach waves or of a spherical radiation centered on points near shock intersections in the supersonic jet flow. Several shadowgraph pictures of cold supersonic jets are presented to demonstrate different facets of the flow field and to show the importance of film-to-flow distance on resolution. From the pictures, it appears that a major part of the observed noise field arises from shock interactions within the jet. [Work supported by the National Aeronautics and Space Administration.]

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