Assessment of Finite Rate Chemistry Large Eddy Simulation Combustion Models.

Area of Science:

• Combustion science
• Computational fluid dynamics
• Turbulence modeling

Background:

• Swirl-stabilized flames are crucial in gas turbine combustors.
• Accurate simulation of these flames requires advanced modeling techniques.

Purpose of the Study:

• To conduct a comparative study of six different Large Eddy Simulation (LES) combustion models.
• To evaluate model performance against experimental data for a swirl-stabilized natural gas-air flame.

Main Methods:

• Employed Large Eddy Simulations (LES) with six finite rate chemistry combustion models.
• Validated predictions against experimental data: velocity, temperature, and species concentrations.
• Investigated the influence of grid resolution (7 and 56 million cells).

Main Results:

• All LES combustion models predicted similar overall flow and flame structures, consistent with experimental observations.
• Flame analysis indicated a premixed flame residing within a thin reaction zone.
• Good agreement was observed for axial velocity, temperature, and major species, though model-specific differences were noted.

Conclusions:

• All examined LES combustion models demonstrated similar capabilities in predicting flame structure and dynamics.
• No single model emerged as definitively superior within the tested range.
• Further research may be needed to differentiate model performance under various conditions.