Fig 1.
The configuration of the computational model.
Table 1.
Main technical parameters of heavy-duty diesel engine.
Table 2..
Model calibration boundary parameter.
Table 3.
Physical and chemical models of simulation.
Fig 2.
Schematic diagram and physical image of the experimental system: (a) schematic diagram; (b) physical image.
Fig 3.
Comparison of pressure and HRR between experimental results and numerical simulation.
Table 4..
Comparison of emission datas between simulation and experiment.
Fig 4.
Influence of intake air temperature on average in-cylinder temperature and spray characteristics: (a) average cylinder temperature; (b) quality of liquid fuel; (c) SMD.
Fig 5.
Cloud map of equivalent ratio distribution within the cylinder at different intake temperatures.
Fig 6.
Schematic diagram of the diesel oxidation mechanism.
Fig 7.
The effect of intake temperature on CH2O, H2O2, and OH contents: (a) CH2O; (b) H2O2; (c) OH.
Fig 8.
Cloud map of OH mass fraction at different intake temperatures.
Fig 9.
Impact of intake temperature on emissions: (a) soot-NOx; (b) HC-CO.
Fig 10.
Comparison curve of average cylinder temperature and liquid fuel mass within the cylinder under different fuel injection timings: (a) average cylinder temperature; (b) quality of liquid fuel.
Fig 11.
Cloud chart of equivalence ratio for different fuel injection timings.
Fig 12.
The effect of fuel injection timing on CH2O, H2O2, and OH coments: (a) CH2O; (b) H2O2; (c) OH.
Fig 13.
The impact of SOImain on emissions: (a) soot-NOx; (b) HC-CO.
Fig 14.
Cloud map of turbulent kinetic energy distribution under different fuel injection pressures.
Fig 15.
Spray characteristics under different injection pressures: (a) SMD; (b) proportion of evaporated fuel mass.
Fig 16.
Cloud map of distribution for equivalence ratios at different fuel injection pressures.
Fig 17.
The effect of fuel injection pressure on CH2O, H2O2, and OH contents: (a) CH2O; (b) H2O2; (c) OH.
Fig 18.
The impact of fuel injection pressure on emissions: (a) soot-NOx; (b) HC-CO.