2 research outputs found
Computational fluid dynamics (CFD) validation and investigation the effect of piston bowl geometries performance on port fuel injection-homogeneous charge compression ignition (PFI-HCCI) engines
Homogeneous charge compression ignition (HCCI) is an advanced combustion strategy proposed to provide higher efficiency and lower emissions than conventional compression ignition. Nevertheless, the operation of HCCI engines still presents formidable challenges. Preparing homogeneous mixtures and controlling the combustion phase are crucial challenges in the context of engine performance. Piston bowl geometry significantly enhances the process by improving the flow and facilitating air-fuel mixing for combustion. On that note, this study utilised the CFD simulation methods to analyse HCCI combustion in port fuel injection (PFI) mode and evaluate the effect of piston bowl geometries on engine performance. For this purpose, the CFD simulation result for a single-cylinder, four-stroke YANMAR diesel engine was validated with experimental data. The different piston bowl geometries with the same volume, compression, and equivalence ratio were then investigated numerically. The validation result of the CFD simulation offers enough confidence to continue the study with different piston bowl geometries. The results attained from the Direct Injection (DI) engine piston bowl application demonstrate a minor change in in-cylinder pressure and heat release rate. The piston bowl design employed in a Port Fuel Injection engine application exhibited different combustion phases while demonstrating similarity in attaining in-cylinder pressure. The findings for swirl induce piston bowl design indicate an enhancement of in-cylinder pressure for the Spiral Crown geometry model, reaching 9.42 MPa. The results of the study demonstrated that the piston bowl's design affected the performance of an HCCI engine
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, 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