Combustion problems are complex and multifaceted. The flowfield in combustors is driven largely by the heat output, and resulting gas expansion, of the chemical reactions that are taking place. This interdependence of chemistry and hydrodynamics makes CFD simulations that involve combustion difficult to deconstruct for troubleshooting. Chemical reactions are often the most mysterious part of reacting flow simulations. Without a tool that can look specifically at the chemical kinetics of the combustion, there is often little insight into the effect of chemistry mechanisms on solution stability and progress.
Chemkin's mechanism analysis tools can be invaluable in tracking down the sources of chemical instability in combustion solutions, and also in determining the most important reactions in a large mechanism. This information can be used to reduce the size of chemical mechanisms, while retaining the key reactions. This translates to fewer transport equations, faster solution times, and more confidence in the predictions of intermediates and pollutants.
When it comes to predicting pollutants, Energico can run an Equivalent Reactor Network (ERN) to predict the pollutants that will be created by a combustion process that excludes the slower pollutant-forming reactions. This process will supplant the older Fluent ERN model.
1.0 Brief overview of Chemkin and its link to Fluent
2.0 Chemkin use in combustion analysis
2.1 How to process a reaction mechanism in Chemkin
2.2 How to examine a mechanism for possible problems
2.3 How to reduce a large mechanism
2.4 How to examine reaction pathways and gain insight into species reactivity
2.5 How to use Chemkin to create flamelets for Fluent
3.1 How to run an equivalent Reactor Network (ERN) in Energico, using Fluent .dat file as input
3.2 Overview of Energico lean blow-off analysis (time permitting)
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Judy Cooper, Lead Technical Support Engineer
Judy received undergraduate and graduate degrees from the University of Ottawa in Chemical Engineering, specializing in combustion. Prior to joining ANSYS, Judy developed fire growth models at Canada’s National Research Council.
Judy’s technical interests and areas of expertise include: Combustion, Multiphase flows, Meshing strategies and Electrochemistry