Large eddy simulations of premixed CH$$_{{\mathbf {4}}}$$ bluff-body flames operating close to the lean limit using quasi-global chemistry and an algebraic chemiluminescence model

2019 ◽  
Vol 33 (3-4) ◽  
pp. 325-340
Author(s):  
E. P. Mitsopoulos ◽  
I. Lytras ◽  
P. Koutmos
Keyword(s):  
Bluff Body ◽  
Large Eddy Simulations ◽  
Large Eddy ◽  
Lean Limit

scholarly journals Sensitivity Analysis of Bluff-Body Stabilized Premixed Flame Large-Eddy Simulations

2020 ◽  
pp. 1-12
Author(s):  
Adam L. Comer ◽  
Cheng Huang ◽  
Swanand Sardeshmukh ◽  
Brent A. Rankin ◽  
Matthew E. Harvazinski ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Bluff Body ◽  
Large Eddy Simulations ◽  
Premixed Flame ◽  
Large Eddy

Experiments and Large-Eddy Simulations of acoustically forced bluff-body flows

2010 ◽  
Vol 31 (5) ◽  
pp. 754-766 ◽  
Author(s):  
S. Ayache ◽  
J.R. Dawson ◽  
A. Triantafyllidis ◽  
R. Balachandran ◽  
E. Mastorakos
Keyword(s):  
Bluff Body ◽  
Large Eddy Simulations ◽  
Large Eddy ◽  
Bluff Body Flows

Towards Modeling Lean Blow Out in Gas Turbine Flameholder Applications

2004 ◽  
Author(s):  
Won-Wook Kim ◽  
Jeffrey J. Lienau ◽  
Paul R. Van Slooten ◽  
Meredith B. Colket ◽  
Robert E. Malecki ◽  
...  
Keyword(s):  
Equivalence Ratio ◽  
Bluff Body ◽  
Recirculation Zone ◽  
Reacting Flows ◽  
Experimental Measurements ◽  
Turbulent Reacting Flows ◽  
Zone Length ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Lean Limit

The objective of this study was to assess the accuracy of the Large-Eddy Simulation (LES) methodology, with a simple combustion closure based on equilibrium chemistry, for simulating turbulent reacting flows behind a bluff body flameholder. Specifically, the variation in recirculation zone length with change in equivalence ratio was calculated and compared to experimental measurements. It was found that the present LES modeling approach can reproduce this variation accurately. However, it understated the recirculation zone length at the stoichiometric condition. The approach was assessed at the lean blow out (LBO) condition to evaluate its behavior at the lean limit and to analyze the physics of combustion instability.

scholarly journals On state instability of the bi-stable flow past a notchback bluff body

2021 ◽  
Vol 931 ◽  
Author(s):  
Kan He ◽  
Guglielmo Minelli ◽  
Xinchao Su ◽  
Guangjun Gao ◽  
Siniša Krajnović
Keyword(s):  
Bluff Body ◽  
Low Frequency ◽  
Large Eddy Simulations ◽  
Turbulence Level ◽  
Wind Tunnel Experiments ◽  
Symmetric State ◽  
Large Eddy ◽  
Proper Orthogonal ◽  
Stable Flow ◽  
Wake State

The wake of a notchback Ahmed body presenting a bi-stable nature is investigated by performing wind tunnel experiments and large-eddy simulations. Attention is confined to the Reynolds number ( $Re$ ) influence on the wake state instability within $5\times 10^{4}\leq Re \leq 25\times 10^{4}$ . Experimental observations suggest a wake bi-stability with low-frequency switches under low $Re$ . The wake becomes ‘tri-stable’ with the increase of $Re$ with the introduction of a new symmetric state. The higher presence of the symmetric state can be considered as a symmetrization of the wake bi-stability with an increasing $Re$ . The wake symmetry under high $Re$ attributed to the highly frequent switches of the wake is extremely sensitive to small yaw angles, showing the feature of bi-stable flows. The wake asymmetry is confirmed in numerical simulations with both low and high $Re$ . The wake asymmetries are indicated by the wake separation, the reattachment and the wake dynamics identified by the proper orthogonal decomposition. However, the turbulence level is found to be significantly higher with a higher $Re$ . This leads to a higher possibility to break the asymmetric state, resulting in highly frequent switches showing symmetry.

Sensitivity Analysis of Bluff Body Stabilized Premixed Flame Large Eddy Simulations

2019 ◽  
Author(s):  
Adam L. Comer ◽  
Cheng Huang ◽  
Karthikeyan Duraisamy ◽  
Swanand V. Sardeshmukh ◽  
Brent A. Rankin ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Bluff Body ◽  
Large Eddy Simulations ◽  
Premixed Flame ◽  
Large Eddy

Corner Vortex Structures: Large Eddy Simulations of a Confined, Premixed Bluff Body Stabilized Flame

2020 ◽  
Author(s):  
Joshua Sykes ◽  
Timothy Gallagher ◽  
Christopher A. Fugger ◽  
Andrew W. Caswell ◽  
Brent A. Rankin
Keyword(s):  
Bluff Body ◽  
Vortex Structures ◽  
Large Eddy Simulations ◽  
Large Eddy ◽  
Corner Vortex
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