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Sound Control of the Turbulent Axisymmetric Air Jet Suitable for Application.
Cvetinović, D. ; Jovanovic, R. ; Vejražka, Jiří ; Tihon, Jaroslav ; Nakabe, K. ; Tatsumi, K.
The subject of this paper is the submerged, round, unconfined turbulent axisymmetric jet, which issues from nozzles with different geometries and impinges to the flat heated plate positioned normally to the jet axis. The aim of experimental investigations, mathematical modeling and numerical simulations is to widely investigate properties and the vortex structures of modified and unmodified jet,that are assumed to have great importance in the heat transfer process. It is found that the vortex roll-up can be controlled by adding small amplitude modulation of the nozzle exit velocity using external source of low-amplitude oscillations or self-sustained oscillations generated in the operation of the specially designed whistler nozzles.
Fulltext: content.csg -  PDF
Plný tet: SKMBT_C22018100509401 - PDF
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Numerické modelování impaktního proudění tekutiny na stěnu a experimentální ověření výsledků pomocí teplotní anemomerie
Cvetinović, D. ; Tihon, Jaroslav ; Vejražka, Jiří ; Drahoš, Jiří
The configuration of a submerged, circular, unconfined impinging air jet, which issues from a bell-shaped converging nozzle, is characterized numerically and experimentally. A commercial CFD package is repeatedly employed to simulate three different configurations to validate the different turbulence models, namely k–? Re-Normalized Group (RNG), k–? Shear Stress Transport (SST) and the Reynolds Stress Model (RSM). A hot-wire anemometry technique is applied to investigate extensively the flow field of the impinging jet. The comparison of results suggests that the k–? SST turbulence model is the most reliable for the flow configurations under investigation.
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