CaDS Seminar 2022 - Nov. 22

Sohel Sebastian Herff (SDL Fluids & Solids Engineering)

Numerical Analysis of the Flame Dynamics and Combustion Instabilities of Premixed Flames

Abstract:
Combustion processes are the key energy contributor in many technical applications, e.g., in stationary gas turbines and aircraft engines. Modern combustors operate in the lean premixed regime to reduce pollutant emissions. However, the lean premixed combustion regime is prone to combustion instabilities. The amplified interaction of the unsteady heat release of the flame with the acoustics of the burner assembly leads to high pressure fluctuations which can cause the structural failure of the combustor. Open questions regarding the influence of geometrical details of the burner facility on the dynamics of the flame and the related combustion instabilities are addressed. Lean premixed flames are numerically investigated by solving the Navier-Stokes equations with a finite-volume large-eddy simulation method. The finite-volume solver is coupled with a solution adaptive level-set solver to model the combustion process by applying a combined G-equation progress variable approach.