Abstract
The instability of supersonic underexpanded submerged air jet outflow from a nozzle with a central cone in the form of two convergent interlaced spirals is described. A technique for controlling this structure by means of extending the central cone streamwise is proposed. It is shown that the central cone position makes it possible to control the gas outflow and to go over from the Mach reflection regime to the regime of wave spiral and gaseous phase condensation, which before were not observable. The results of the measurements of the dynamic head of jets issuing from the nozzle with and without the central cone are presented.
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