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Numerical simulation of tangentially injected turbulent swirling flow in a divergent tube
Author(s) -
Guo HuiFen,
Chen ZhiYong
Publication year - 2008
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.1985
Subject(s) - mechanics , injector , turbulence , vortex , mach number , jet (fluid) , physics , conical surface , stagnation point , flow (mathematics) , position (finance) , inlet , meteorology , geology , geometry , thermodynamics , mathematics , heat transfer , finance , geomorphology , economics
This paper studies the properties of turbulent swirling decaying flow induced by tangential inlets in a divergent pipe using the realizable k –ε turbulence model and discusses the effects of the injector pressure and injection position. The results of transient solutions show that both the recirculation zone near the wall in upstream of the injectors and the vortex breakdown in downstream of the injectors increase in size during the whole period. A nearly axisymmetric conical breakdown is formed and its internal structure consists of two asymmetric spiral‐like vortices rotating in opposite directions. The stagnation point shifts slowly toward the pipe outlet over time. The maxima of the three velocity components, which are located near the wall, decrease gradually with streamwise direction. It can also be inferred that Mach number approaches 1.0 near the injector outlets. The velocities increase with the increasing injector pressure. However, its increasing trend is not significant. With the increase of the injection position, vortex breakdown moves in downstream direction and the pitch along the streamwise direction increases. Copyright © 2008 John Wiley & Sons, Ltd.