INFLUENCE OF ACOUSTIC FLUCTUATIONS ON THE ROUND JET, FORMED IN CURVED CHANNEL

Read more The results of experimental investigations on the effect of the transverse acoustic fluctuations for subsonic round jet formed in curved channel (d = 20; 9; 1.5 mm) are presented. Using laser – smoke visualization the jet instant picture sections were received, which showed the presence of two modes jets instabilities – Kelvin – Helmholtz vortices and Dean vortices and their interaction. The influence of the acoustic excitation frequencies on the jets are shown, in particular on a wavelength of Kelvin – Helmholtz instability. The picture of the diffusion combustion of propane jet with a nozzle diameter of d = 1,5 mm without acoustic excitation and with acoustic excitation are compared. It has been observed that the diffusion flame combustion of propane is subject to transformation by the action of the acoustic field and developing instabilities in the jet.

Keywords:
free round jet, curved channel, Dean vortices, smoke vizualization, acoustic field, PIV-measurements, Kelvin – Helmholtz instability. 
УДК 532.526

INFLUENCE OF ACOUSTIC FLUCTUATIONS ON THE ROUND JET, FORMED IN CURVED CHANNEL