Mach disk

Mach disk

[′mäk ‚disk]
(fluid mechanics)
A structure visible on a schlieren photograph of a supersonic air jet exhausting from a nozzle at low pressure into higher-pressure air at rest; it is formed by the focusing and strengthening of oblique shock waves emanating from the edges of the nozzle as they approach the jet axis.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Additionally, when the pressure reaches 50 MPa, there is a Mach disk next to the nozzle exit.