CCS and Power Systems
Advanced Energy Systems - Hydrogen Turbines
Development and Experimental Validation of Large-Eddy Simulation Techniques - Syngas Combustion
Performer: Regents of the University of Michigan
Project No: FE0007060
- Development of multi-stream flamelet/progress variable combustion model for application to partially-premixed combustion in vitiated flow environments. Validation of the combustion model in application to LES of a piloted partially-premixed jet burner configuration (see Figure 1), considering a series of increasingly complex operating conditions.
- Conduct an a priori analysis of critical modeling assumption in flamelet-combustion models, represent leading effects in flame ignition where they act as secondary heat-induced transition models. From this analysis, it could be shown that higher-order expansion terms that are commonly omitted in flamelet-combustion models, represent leading effects in flame ignition where they act as secondary heat-induced transition modes.
- Conducted LES of a gas turbine model combustor (see Figure 2); performed a detailed sensitivity study to assess and quantify effects of grid resolution, LES subgrid closure models, and inflow conditions on the unsteady flame topology, heat release, and flow field behavior.
- Development of a lower order model to investigate effects of inhomogeneities, arising from turbulent flow field and inhomogeneities in temperature and mixture composition, on the ignition characteristics. From this study, it could be shown that temperature perturbations in conjunction with flow field inhomogeneities promote localized ignition, which primarily occurs in regions of suppressed turbulent mixing in close proximity to the wall region.