Numerical study of piston bowl geometries on PFI-HCCI engine performance
Homogeneous charge compression ignition (HCCI) is an advanced combustion strategy proposed to provide higher efficiency and lower emissions than conventional compression ignition. However, there are still tough challenges in the successful operation of HCCI engines. Among these challenges, homoge...
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Main Authors: | , , , , |
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Format: | Article |
Published: |
Universiti Malaysia Pahang Faculty of Mechanical Engineering
2023
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Online Access: | http://psasir.upm.edu.my/id/eprint/108966/ https://doi.org/10.15282/jmes.17.4.2023.3.0767 |
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Summary: | Homogeneous charge compression ignition (HCCI) is an advanced combustion
strategy proposed to provide higher efficiency and lower emissions than conventional
compression ignition. However, there are still tough challenges in the successful operation of
HCCI engines. Among these challenges, homogeneous mixture preparation and combustion
phase control plays a vital role in determining the efficiency and emissions. Piston bowl
geometry significantly enhances the process by improving the flow, turbulence, and mixing for
the combustion. The study utilised experimental and numerical simulation methods to analyse
HCCI combustion in port fuel injection (PFI) mode and evaluate the effect of piston geometries
on engine performance. For this purpose, the different pistons bowl geometries (Baseline
model, SQC, and CCC) with the same volume, compression, and equivalence ratio were
numerically tested in a four-stroke, single-cylinder, YANMAR diesel engine. The numerical
simulation results provide adequate assurance to proceed with the study with different piston
geometries design. Compared to SQC and CCC, the Baseline model produced significantly
higher cylinder pressure, temperature, and heat release rate. Different piston shape designs
influenced the formation of air-fuel mixing, thereby affecting the time and location of onset
combustion. The present investigation offered the significant role of piston geometry for the
control mechanism of PFI-HCCI combustion, that is a vital part in demonstrating HCCI
combustion. |
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