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ISSN 在线: 2152-209X

Archives: Volume 1, 2011 to Volume 9, 2019

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DOI: 10.1615/VisMechProc.v1.i2.30

Visualization of the processes of development and turbulent breakdown of a low speed round jet

Victor V. Kozlov
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 4/1, Novosibirsk, 630090 Novosibirsk region, Russia
Genrich R. Grek
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 4/1, Novosibirsk, 630090 Novosibirsk region, Russia
G. V. Kozlov
Institute of Applied Mechanics, Russian Academy of Sciences, Moscow, Russia
Maria V. Litvinenko
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences

ABSTRACT

Results of experimental investigations of the influence of longitudinal streaky structures on the turbulization process of a a low speed round laminar jet are presented in this work. Qualitative characteristics of the jet development with the application of a smoke visualization of the flow pattern in the jet and video filming of cross and longitudinal sections of the jet, illuminated by a laser sheet at the image stroboscoping. It is shown that streaky structures can be generated directly in the nozzle exit section, and their interaction with the Kelvin-Helmholtz ring vortices leads to the appearance of azimuth beams (Λ- or Ω-vortex structures) of a type of a distortion of the 2D Tollmien-Schlichting wave at a nonlinear stage of classical transition in the near-wall flows. The influence of the jet outflow velocity and acoustic excitation on the jet turbulization is considered.