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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References in periodicals archive ?
Additionally, when the pressure reaches 50 MPa, there is a Mach disk next to the nozzle exit.
After every shock diamond or shock cell, there existed a normal shock in the jet flow called Mach disk. The location of the Mach disk is important because it affects the static temperature distribution of the jet.
Here x is the distance between the nozzle exit and the Mach disk, [d.sub.exit] is the nozzle diameter, [P.sub.0] is the pre-chamber pressure, and [P.sub.b] is the back pressure.
The position of the first Mach disk shifted downstream with increased area ratio.
It creates a Mach disk and the triple point where Mach disk interests with the oblique shock waves.