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  • Contributed by the 8th Asian Symposium on Computational Heat Transfer and Fluid Flow (ASCHT-2021)
  • Published:

Numerical Simulation of the High-Boosting Influence on Mixing, Combustion and Emissions of High-Power-Density Engine


Future high-power-density engines require high level of intake boost. However, the effects of boosting on mixing, combustion and emissions in existing studies are inconsistent. In this paper, the mixing, combustion and emission characteristics with intake pressures of 100–400 kPa at low, medium and high loads are studied. The results show that the increase of intake pressures is conducive to the enhancement of air entrainment, while the air utilization ratios are reduced, thus requiring injection pressure to be optimized to effectively improve the mixing. For the intake pressures of 100 kPa, the average chemical reaction path is low-temperature reaction route, while the path of higher intake pressures is dominated by high-temperature pyrolysis. For soot emissions, when the equivalence ratio is lower than 0.175, the oxygen in the cylinder is sufficient, so the effect of temperature decrease is more significant, which leads to the increase of soot emissions with the increase of intake pressures. Otherwise, the effect of increasing oxygen concentration is more significant, so soot decreases accordingly. When the peak of global temperature is lower than 1800 K, the effect of the increase of oxygen concentration is more dominant, so the NOx emission increases with the increase of intake pressures. Otherwise, the rule of NOx emissions is consistent with temperature changes.

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three dimensional


adaptive mesh refinement


after top dead center


crank angle


crank angle corresponding to the 10% of the total heat release


crank angle corresponding to the 50% of the total heat release


computational fluid dynamic


direct injection


exhaust gas recirculation


exhaust valve opening


homogeneous charge compression ignition


heat release rate


intake valve closing


indicated mean effective pressure


low temperature combustion

NOx :

nitric oxides


polycyclic aromatic hydrocarbon


particulate matter


primary reference fuel


representative exothermic reactions


start of injection

T :



top dead center


unburned hydrocarbon

ρ a :


φ :

equivalence ratio


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This work was supported by the Natural Science Foundation of China (No. 51921004 and U2241262).

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Correspondence to Haifeng Liu.

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Wang, C., Yue, Z., Zhao, Y. et al. Numerical Simulation of the High-Boosting Influence on Mixing, Combustion and Emissions of High-Power-Density Engine. J. Therm. Sci. 32, 933–946 (2023).

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