HCCI modelling progress
12
HCCI modelling progress Sebastian Mosbach 20 March 2007
description
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. - PowerPoint PPT Presentation
Transcript of HCCI modelling progress
HCCI modelling progress
Sebastian Mosbach
20 March 2007
Sebastian [email protected]
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
Sebastian [email protected]
Dual Injection HCCI
Bore 95 mm
Stroke 115 mm
Displaced volume 815 cm3
Connecting rod length 210 mm
Compression ratio (CR) 11
Speed 1400 RPM
Fuel Gasoline
Air/fuel equivalence ratio 1.6
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 (SOI1) 340 CAD BTDC
Start of second injection (SOI2) 40 CAD BTDC
• Effect of charge stratification on maximum pressure rise rates
Int. J. Eng. Res., Feb. 2007
• Z. Wang, J.-X. Wang
Sebastian [email protected]
Dual Injection HCCI
• Evaporation of liquid fuel • Gaseous fuel mass fraction
Int. J. Eng. Res., Feb. 2007
Sebastian [email protected]
Dual Injection HCCI
• Parameter dependence of charge stratification level
Int. J. Eng. Res., Feb. 2007
Sebastian [email protected]
Dual Injection HCCI
• Higher stratification levels • Evolution of fluid parcels
Int. J. Eng. Res., Feb. 2007
Sebastian [email protected]
Partial charge stratification• Future work: Prediction of soot aggregates
• Particle size distributions
• Aggregate morphology
Sebastian [email protected]
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
Sebastian [email protected]
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.
Sebastian [email protected]
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.)
