Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session G02: Turbulent Combustion III: Combustors
10:35 AM–12:32 PM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B203
Chair: Paul Palies, CFD Research Corporation
Abstract ID: BAPS.2018.DFD.G02.5
Abstract: G02.00005 : A numerical study on NO emission in bluff-body stabilized swirl diffusion flames
11:27 AM–11:40 AM
Presenter:
Nafiseh Jalalatian
(Amirkabir University of Technology)
Authors:
Nafiseh Jalalatian
(Amirkabir University of Technology)
Babak Kashir
(Univ of Illinois - Chicago)
The combustion characteristics of the methane blended bluff-body stabilized swirl diffusion flames within the turbulent regime are studied numerically with a coupled flamelet/radiation approach along with a modified k-ε turbulence model to determine the effect of swirl number on the flame dynamics and NO emission. The selected flames are controlled by changing the bulk tangential velocity of the swirl annulus whilst they possess the same operating conditions.
Two different structures are observed by changing the swirl intensity. Flames with low swirl number (Sg=0.3) showed a radially converged shape in downstream. With increasing the swirl number a downstream recirculation zone is appeared due to vortex breakdown formation which provides an hourglass shape with open tails. However, the flame length is inversely related to the swirl number. Furthermore, results show that NO emission profiles are strongly analogous to the temperature distribution which demonstrates the thermal NO formation. The NO mass fraction values in the near-field and far-field regions are investigated with fuel enrichment. It is found that increasing the H/C atoms at the inflow diminishes the NO level.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.G02.5
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