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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

Journal of Thermal Science volume 32, pages 933–946 (2023)Cite this article

Abstract

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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Abbreviations

3D:

three dimensional

AMR:

adaptive mesh refinement

ATDC:

after top dead center

CA:

crank angle

CA10:

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

CA50:

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

CFD:

computational fluid dynamic

DI:

direct injection

EGR:

exhaust gas recirculation

EVO:

exhaust valve opening

HCCI:

homogeneous charge compression ignition

HRR:

heat release rate

IVC:

intake valve closing

IMEP:

indicated mean effective pressure

LTC:

low temperature combustion

NOx :

nitric oxides

PAH:

polycyclic aromatic hydrocarbon

PM:

particulate matter

PRF:

primary reference fuel

RREX:

representative exothermic reactions

SOI:

start of injection

T :

temperature

TDC:

top dead center

UHC:

unburned hydrocarbon

ρ a :

density

φ :

equivalence ratio

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Acknowledgement

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

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Authors and Affiliations

  1. State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China

    Can Wang, Zongyu Yue, Yuanyuan Zhao, Ying Ye & Haifeng Liu

  2. Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal, 23900, Saudi Arabia

    Xinlei Liu

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  1. Can Wang
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  2. Zongyu Yue
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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). https://doi.org/10.1007/s11630-023-1796-9

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  • DOI: https://doi.org/10.1007/s11630-023-1796-9

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