Experimental speed study of twirled gas pipe with precessing vortex nuclei

The results of an experimental study of a strongly wound free isothermal jet with a precessing vortex core are presented. It was found that the distribution of radial and tangential velocity components while moving away from the cut of the supply nozzle has a maximum that mirrors its position relatively to the central axis in step of 1 gauge due to the influence of vortex core on flow structure. It is shown that an axial component taken at different distances from the axis of the jet is characterized by the presence of positive and negative velocities in the initial section, separation of which corresponds to the outer and inner parts of the swirling jet, while velocity variation along the length of the jet has four distinct sections, that is caused by the existence of reverse currents zones, and change in the velocity along the axis of the stream indicates a nonlinear change in the shape of this zone.