Case Description

• ·   Simulation of a four cylinder diesel engine
• ·   Engine specification

Computational Mesh

• ·   About 11,000 structured hexahedral cells
• ·   45° sector mesh with periodic boundary condition

Operating Condition

• ·  Engine speed : 1500 rpm
• ·  BMEP : 6 bar
• ·  EGR : 28.7 %
• ·  Injected fuel mass : 21.3 mg
• ·  Average swirl ratio at IVC : 2.62

Physical Models

• ·  Turbulence Model : Realizable k-ε model
• ·  Combustion Model : CMC(Conditional Moment Closure)
• ·  Fuel Spray Models (in OpenFOAM)

– Injector Model : Cone nozzle injector

– Breakup Model : Reitz KH-RT

– Atomization model : Blobs sheet atomization

– Collision Model : Trajectory

– Evaporation Model : Liquid evaporation

– Heat Transfer Model : Ranz-Marshall

– Dispersion Model : Stochastic dispersion

– Drag Model : Sphere drag

– Wall model : Standard wall interaction

Results

• Movie of the temperature and fuel droplets with moving piston head.

• Distributions of mean temperature and fuel droplets with 3 flame groups (a, c, e) and 12 flame groups (b, d, f).​