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HCCI modelling progress

HCCI modelling progress. Sebastian Mosbach 20 March 2007. The CoMo group at Cambridge. Founded in 1999. Headed by Dr. Markus Kraft. Currently 22 members. Areas of application :. Nanoparticles. Particle processes. Engines. Novel methods : Numerics, CFD, Quantum Chemistry, etc.

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HCCI modelling progress

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  1. HCCI modelling progress Sebastian Mosbach 20 March 2007

  2. The CoMo group at Cambridge • Founded in 1999 • Headed by Dr. Markus Kraft • Currently 22 members • Areas of application: Nanoparticles Particle processes Engines • Novel methods: Numerics, CFD, Quantum Chemistry, etc.

  3. Dual Injection HCCI • Effect of charge stratification on maximum pressure rise rates • Z. Wang, J.-X. Wang Int. J. Eng. Res., Feb. 2007

  4. Dual Injection HCCI • Gaseous fuel mass fraction • Evaporation of liquid fuel Int. J. Eng. Res., Feb. 2007

  5. Dual Injection HCCI • Parameter dependence of charge stratification level Int. J. Eng. Res., Feb. 2007

  6. Dual Injection HCCI • Higher stratification levels • Evolution of fluid parcels Int. J. Eng. Res., Feb. 2007

  7. Partial charge stratification • Future work: Prediction of soot aggregates • Particle size distributions • Aggregate morphology

  8. Real-time transient simulation • M. Sjöberg, J. Dec • Studies of transient engine operation, control, DOE, and optimization involve simulations over many cycles • Problem: Computational expense • Solution: Storage/retrieval • Full-cycle 1D CFD, GT-Power 6.2

  9. Example: Transient control

  10. Example: Transient control • Imposed equivalence ratio profile • PID controller changes fuel composition (octane number) such that… • … ignition timing (CA50) is held at a given set point.

  11. Example: Transient control • Since SRM accounts for inhomogeneities, turbulent mixing, and detailed chemical kinetics, can look at… • maximum pressure rise rates, • and emissions (e.g.)

  12. Example: Transient control • Live simulation…

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