Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Mixing and entrainment of transitional non-circular buoyant reactive plumes
AU - Jiang, Xi
AU - Luo, K H
PY - 2001/9
Y1 - 2001/9
N2 - Three-dimensional spatial direct numerical simulation is used to investigate the evolution of reactive plumes established on non-circular sources. Simulations are performed for three cases: a rectangular plume with an aspect ratio of 2:1, a square plume, and the square plume in a corner configuration. Buoyancy-induced large scale vortical structures evolve spatially in the flow field. A stronger tendency of transition to turbulence is observed for the free rectangular plume than the free square case due to the aspect ratio effect. Dynamics of the corner square plume differs significantly from the corresponding free case due to the enhanced mixing by the side-wall effects. A turbulent inertial subrange has been observed for the free rectangular and corner square plumes. Mean flow properties are also calculated. The study shows significant effects of source geometry and side-wall boundary on the flow transition and entrainment of reactive plumes.
AB - Three-dimensional spatial direct numerical simulation is used to investigate the evolution of reactive plumes established on non-circular sources. Simulations are performed for three cases: a rectangular plume with an aspect ratio of 2:1, a square plume, and the square plume in a corner configuration. Buoyancy-induced large scale vortical structures evolve spatially in the flow field. A stronger tendency of transition to turbulence is observed for the free rectangular plume than the free square case due to the aspect ratio effect. Dynamics of the corner square plume differs significantly from the corresponding free case due to the enhanced mixing by the side-wall effects. A turbulent inertial subrange has been observed for the free rectangular and corner square plumes. Mean flow properties are also calculated. The study shows significant effects of source geometry and side-wall boundary on the flow transition and entrainment of reactive plumes.
KW - buoyancy
KW - DNS
KW - entrainment
KW - mixing
KW - non-premixed flame
KW - reaction
KW - transition
KW - DIRECT NUMERICAL-SIMULATION
KW - SQUARE JETS
KW - BOUNDARY-CONDITIONS
KW - DIFFUSION FLAMES
KW - HEAT RELEASE
KW - TURBULENT
KW - FLOWS
KW - INSTABILITY
KW - COMBUSTION
U2 - 10.1023/A:1013539806013
DO - 10.1023/A:1013539806013
M3 - Journal article
VL - 67
SP - 57
EP - 79
JO - Flow, Turbulence and Combustion
JF - Flow, Turbulence and Combustion
SN - 1386-6184
IS - 1
ER -