Mixing and entrainment of transitional noncircular buoyant reactive plumes
Jiang, X. and Luo, K.H. (2001) Mixing and entrainment of transitional noncircular buoyant reactive plumes. Flow, Turbulence and Combustion, 67, (1), 57-79. (doi:10.1023/A:1013539806013).
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Three-dimensional spatial direct numerical simulation is used to investigate the evolution of reactive plumes established on non-circularsources. Simulations are performed for three cases: a rectangular plumewith an aspect ratio of 2:1, a square plume, and the square plume in acorner configuration. Buoyancy-induced large scale vortical structuresevolve spatially in the flow field. A stronger tendency of transition toturbulence is observed for the free rectangular plume than the freesquare case due to the aspect ratio effect. Dynamics of the cornersquare plume differs significantly from the corresponding free case dueto the enhanced mixing by the side-wall effects. A turbulent inertialsubrange has been observed for the free rectangular and corner squareplumes. Mean flow properties are also calculated. The study showssignificant effects of source geometry and side-wall boundary on theflow transition and entrainment of reactive plumes.
|Keywords:||buoyancy, DNS, entrainment, mixing, non-premixed flame, reaction, transition|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
|Date Deposited:||28 Mar 2006|
|Last Modified:||06 Aug 2015 02:22|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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