Processes of Precession and Nutation in Swirling Interacting Gas Jets

International Multi-Conference on Industrial Engineering and Modern technologies

Zaytsev, O.N.^1 ; Tsopa, N.V.^1 ; Stepancova, N.A.^1

V.I. Vernadsky Crimean Federal University (Vernadsky CFU), 4 Vernadskogo Prospekt, Simferopol, Russia^1

关键词: Axial velocity component;    Precessing vortex core;    Relative amplitude;    Reverse currents;    Swirling jets;    Tangential velocities;    Tangential velocity component;    Unstable regions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/463/3/032053/pdf
DOI  :  10.1088/1757-899X/463/3/032053

来源: IOP

【 摘 要 】

The results of experimental studies of the oscillations of the velocity of a free isothermal swirling jet with a precessing vortex core are presented. They showed that in the initial section where there is a developed zone of reverse currents, the oscillations of the radial and tangential velocity components are observed in the regions of maximum values in the peripheral layers of the jet, which is explained by the nutation of the precessing vortex core. The most unstable region in a free twisted jet corresponding to the revealed maximum of the amplitude of the oscillations of the axial velocity component at a distance of 3-4 diameters is determined. It is shown that in the main part an increase in the relative amplitude of the radial and tangential velocities is observed throughout the section, the maximum values occurring in the region located outside the back current zone.