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HCCI modelling progress Sebastian Mosbach 20 March 2007.

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Presentation on theme: "HCCI modelling progress Sebastian Mosbach 20 March 2007."— Presentation transcript:

1 HCCI modelling progress Sebastian Mosbach 20 March 2007

2 Sebastian Mosbach sm453@cam.ac.uk The CoMo group at Cambridge Areas of application: Engines Nanoparticles Particle processes Novel methods: Numerics, CFD, Quantum Chemistry, etc. Founded in 1999 Headed by Dr. Markus Kraft Currently 22 members

3 Sebastian Mosbach sm453@cam.ac.uk Dual Injection HCCI Bore95 mm Stroke115 mm Displaced volume815 cm 3 Connecting rod length210 mm Compression ratio (CR)11 Speed1400 RPM FuelGasoline Air/fuel equivalence ratio1.6 EGR ratio (internal+external)20% Inlet valve opening (IVO)350 CAD ATDC Inlet valve closing (IVC)150 CAD BTDC Exhaust valve opening (EVO)120 CAD ATDC Exhaust valve closing (EVC)370 CAD ATDC Start of first injection (SOI 1 )340 CAD BTDC Start of second injection (SOI 2 )40 CAD BTDC Effect of charge stratification on maximum pressure rise rates Int. J. Eng. Res., Feb. 2007 Z. Wang, J.-X. Wang

4 Sebastian Mosbach sm453@cam.ac.uk Dual Injection HCCI Evaporation of liquid fuel Gaseous fuel mass fraction Int. J. Eng. Res., Feb. 2007

5 Sebastian Mosbach sm453@cam.ac.uk Dual Injection HCCI Parameter dependence of charge stratification level Int. J. Eng. Res., Feb. 2007

6 Sebastian Mosbach sm453@cam.ac.uk Dual Injection HCCI Higher stratification levelsEvolution of fluid parcels Int. J. Eng. Res., Feb. 2007

7 Sebastian Mosbach sm453@cam.ac.uk Partial charge stratification Future work: Prediction of soot aggregates Particle size distributions Aggregate morphology

8 Sebastian Mosbach sm453@cam.ac.uk Real-time transient simulation Full-cycle 1D CFD, GT-Power 6.2 M. Sjöberg, J. Dec Problem: Computational expense Studies of transient engine operation, control, DOE, and optimization involve simulations over many cycles Solution: Storage/retrieval

9 Sebastian Mosbach sm453@cam.ac.uk Example: Transient control

10 Sebastian Mosbach sm453@cam.ac.uk Example: Transient control PID controller changes fuel composition (octane number) such that… Imposed equivalence ratio profile … ignition timing (CA50) is held at a given set point.

11 Sebastian Mosbach sm453@cam.ac.uk 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 Sebastian Mosbach sm453@cam.ac.uk Example: Transient control Live simulation…

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