INSTABILITY MODELLING OF THE LAMINAR ROUND JET WITH PARABOLIC MEAN VELOCITY PROFILE

Read more Results of the experimental modelling of instability of the laminar round jet with parabolic mean velocity profile caused by the weak crossflow are reported. It is shown, that the jet instability result in its deformation in the form of tangential gas ejections into the ambient space, which immediately folded up to form a counter-rotating vortex pair and decreasing of the jet core size. Smoke visualization patterns of the jet under acoustic effect on it at low and high frequencies are considered. It is demonstrated, that the tangential gas ejections from jet are subjected to secondary high frequency instability. Comparison of the present studies results with results of the known experimental and numerical studies obtained by other investigators are presented.

Keywords:
modelling, round jet, jet instability, visualization of jet flow, hot-wire anemometry, acoustic, secondary high-frequency instability.
УДК 532.526

INSTABILITY MODELLING OF THE LAMINAR ROUND JET WITH PARABOLIC MEAN VELOCITY PROFILE