Combustion and Emissions


GT-POWER includes various solutions for modeling combustion and emissions.  These solutions play an integral role for engine simulations to accurately predict performance, fuel consumption and engine-out emissions.  Various models are available to predict combustion and pollutant formation based on in-cylinder conditions, knock, cycle-to-cycle variation (CCV) and other related processes.  These models enable successful analysis at full and part load, as well as real-time capable transient operation for traditional and advanced combustion concepts.

We also offer an Advanced Combustion Toolset, a collection of productivity tools that enable both increased model fidelity and faster runtimes. It includes a state of the art chemical kinetics solver that offers significantly improved computational times, enabling usage of more detailed mechanisms. Potential applications for detailed kinetics include:

  • Chemistry in Cylinder Unburned Zone (Knock)
  • Chemistry in Cylinder Burned Zone (Emissions)
  • Chemistry in Pipes/Flowsplits (Exhaust Manifold Oxidation)

The toolset also includes a pre-processing tool that predicts ignition delay time for mixtures of air, fuel, and residual gases using detailed kinetics. This tool enables the user to create custom correlations for ignition delay (CI) or knock (SI) that consider the effect of pressure, temperature, equivalence ratio, residual gas fraction, fuel composition, etc.

Product Highlights

  • Predictive combustion models for:
    • Multi-pulse direct injection diesel
    • Port and/or direct injection spark ignition
    • Dual-fuel (premixed fuel-air mixture ignited by direct injection)
    • HCCI
    • User code
  • Imposed burn rate profiles for any combustion concept (derived from cylinder pressure analysis, Wiebe, map based, neural network, etc.)
  • Predictive emissions models for NOx, HC, CO and soot
  • Predictive knock models

Advanced Features and Applications

  • Model any combustion mode with any fuel (SI, diesel, dual-fuel, pre-chamber, HCCI, etc.)
  • Model mean cycle combustion and CCV
  • Detailed kinetics or partial equilibrium for calculating any emissions species
  • Predict knock boundary or evaluate knock onset and intensity using detailed kinetics or induction time integral models
  • Calculate in-cylinder flow and turbulence model which couples to combustion and heat transfer models
  • Model combustion interaction with cylinder FE wall temperature solution
  • Model in-cylinder evaporation