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مکانیک::
حلقه گرداب
Cigar smoke marks the shear layer and vortex rings of the jet.
The shear layer of a turbulent jet typically rolls up into distinct vortex rings which subsequently interact to form larger structures.
However, significant differences appear in the development of the secondary instability: Swirl does not affect, qualitatively, the formation of vortex rings, it strengthens the development of azimuthal defor-
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