Exact(30)
The position of the shock cell for both images is in good agreement with each other.
Figure 1 shows the typical overexpanded shock cell structure in a supersonic jet.
The quasi-periodic shock cell structure resembles that of a slightly imperfectly expanded jet.
This is done by first observing that in this wider Mach number range the shock cell structure in the jet plume usually begins with a strong shock followed by a quasi-periodic shock cell structure.
The shock cell structures of single supersonic non-ideally expanded jets with arbitrary exit geometry are studied.
When this happens, the almost periodic shock cell structure of the fan stream is found to nearly completely disappear.
Similar(30)
Previous studies on single stream supersonic jets reveal that broadband shock-cell noise from these jets is generated by the interaction of the large turbulence structures and the shock cells in the jet plume as the former propagate downstream through the latter.
In an ideal inviscid fully expanded jet no shock cells would be present but in the turbulent jet calculations weak shock cells appeared which gradually died out beyond about 10 diameters from the nozzle exit.
The second sound field is generated in a similar manner involving the large turbulence structures and the shock cells in the inner shear layer of the jet.
The focus of this investigation is on the jet screech phenomenon resulting from the interaction between the large-scale turbulent mixing region instabilities and the regular spacing of the shock wave-expansion system, (shock cells), in the over-expanded jet.
It is believed that the first sound field is generated by the interaction of the large turbulence structures and the shock cells in the outer shear layer of the dual stream jet.
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