Large Eddy Simulations of Premixed Bluff Body Stabilized Flame using Detailed Chemistry with Flamelet Generated Manifold: Grid Sensitivity Analysis

2019 ◽  
Author(s):  
Ishan Verma ◽  
Rakesh Yadav ◽  
Stefano Orsino ◽  
Patrick Sharkey ◽  
Pravin Nakod
Keyword(s):  
Sensitivity Analysis ◽  
Bluff Body ◽  
Large Eddy Simulations ◽  
Detailed Chemistry ◽  
Flamelet Generated Manifold ◽  
Large Eddy

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

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

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

Large Eddy Simulation and Experimental Analysis of Combustion Dynamics in a Gas Turbine Burner

2019 ◽  
Vol 141 (7) ◽  
Author(s):  
Daniel Moëll ◽  
Andreas Lantz ◽  
Karl Bengtson ◽  
Daniel Lörstad ◽  
Annika Lindholm ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Gas Turbine ◽  
Flame Temperature ◽  
Cross Flow ◽  
Flame Stabilization ◽  
Large Eddy Simulations ◽  
Combustion Dynamics ◽  
Flamelet Generated Manifold ◽  
Large Eddy ◽  
Gas Turbine Burner

Large eddy simulations (LES) and experiments (planar laser-induced fluorescence of the hydroxyl radical (OH-PLIF) and pressure transducer) have been carried out on a gas turbine burner fitted to an atmospheric combustion rig. This burner, from the Siemens SGT-800 gas turbine, is a low NOx, partially premixed burner, where preheat air temperature, flame temperature, and pressure drop across the burner are kept similar to engine full load conditions. The large eddy simulations are based on a flamelet-generated manifold (FGM) approach for representing the chemistry and the Smagorinsky model for subgrid turbulence. The experimental data and simulation data are in good agreement, both in terms of time averaged and time-resolved quantities. From the experiments and LES, three bands of frequencies of pressure fluctuations with high power spectral density are found in the combustion chamber. The first two bands are found to be axial pressure modes, triggered by coherent flow motions from the burner, such as the flame stabilization location and the precessing vortex core (PVC). The third band is found to be a cross flow directional mode interacting with two of the four combustion chamber walls in the square section of the combustion chamber, triggered from general flow motions. This study shows that LES of real gas turbine components is feasible and that the results give important insight into the flow, flame, and acoustic interactions in a specific combustion system.

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.

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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