Numerical Simulations of dual fuel engines
Transcript of Numerical Simulations of dual fuel engines
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ENGINE SIMULATIONS
Gilles Decan
DEPARTMENT ELECTRICAL ENERGY, METALS, MECHANICAL CONSTRUCTION & SYSTEMS
SUSTAINABLE THERMO-FLUID ENERGY SYSTEMS GROUP
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FROM DIESEL TO DUAL FUEL
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• Replace 90 – 95% of diesel by low-carbon alternative
- CH4 / CH3OH / H2
- Reduce emissions and CO2
- Retrofit
- Introduce renewable fuels (bio, e-fuels)
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ENGINE DEVELOPMENT
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• Development trough simulations
- Emission prediction
- Flow behaviour
- Heat transfer
- Spray modeling
- Combustion modeling
• Optimization of engine operation
- DF specific: ensure good combustion!
at entire operating range
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OPENFOAM UTILITIES
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• Engine simulations
- Piston movement
- Spray injection
- Auto-ignition, chemistry modeling
- Flame modeling and propagation
OF2.2.x: own solver (dual-fuel)
OF6: engineFoam (diesel only)
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DIESEL ENGINE TUTORIAL
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ENGINE MESH
• 40° Simplified sector mesh
- Create with blockMesh
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Simplified
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5
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1 6, 2
4 5, 3
1, 4
5, 6
3, 2
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RUNNING ON HPC
• qsub –I –pass=reservation=PRETREF –l nodes=1:ppn=10
• module load OpenFOAM/6-intel-2018a
• source $FOAM_BASH
• source $WM_PROJECT_DIR/bin/tools/RunFunctions
• tar –xzf DieselEngine.tgz
• cd DieselEngine
• blockMesh
• checkMesh
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ENGINE SIMULATION SETUP
• Chemistry through chemkin
- constant/thermophysicalProperties
- change - investigate
• Define engine geometry
- constant/engineGeometry
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• Spray injection + modeling- constant/sprayCloudProperties
- change - investigate
• Turbulence modeling- constant/turbulenceProperties
• Combustion model
- constant/combustionProperties
- change - investigate
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ENGINE INITIALIZATION
• Species fields
- CO2/H2O/O2/N2/fuel
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• Pressure,
temperature, U
• Turbulence
- k/epsilon
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RUNNING ON HPC
• qsub –I –pass=reservation=PRETREF –l nodes=1:ppn=10
• module load OpenFOAM/6-intel-2018a
• source $FOAM_BASH source $WM_PROJECT_DIR/bin/tools/RunFunctions
• (blockMesh)
• decomposePar
• mpirun –np 10 engineFoam –parallel (> log &)
• reconstructPar
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RESULTS
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Pressure and HRR trace
Indicated Work
Temperature field
NOx emissions
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RESULTS
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DUAL FUEL RESULTS
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Pressure and HRR trace
Temperature field
NOx emissions
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DUAL FUEL RESULTS
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