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.
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References in periodicals archive ?
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.
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.