Effect of a novel piston geometry on the combustion process of a light-duty compression ignition engine: An optical analysis

Pastor, Javier; García, Antonio; Micó, Carlos; Lewiski, Felipe; Vassallo, Alberto; Pesce, Francesco Concetto

doi:10.1016/j.energy.2021.119764

Cited by 22 publications

(4 citation statements)

References 30 publications

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“…The efficiency of the diesel engine is based on good combustion, and in medium-weight engines, the interactions between the fuel spray and the piston tank walls play a very important role in defining the heat release rate. Staged lip pistons promote turbulence phenomena that are the result of faster and more efficient heat release, but it is important to note that this behavior is more observable for late injection stalls where the engine is not operating at its maximum efficiency [43]. From the above, Figure 1 represents a new mediumweight diesel search engine was carried out at Sandia National Laboratories, to ensure quality research on the combustion of pollutants and methods of heat loss through walls to improve its efficiency.…”

Section: Methodsmentioning

confidence: 99%

Simulating the Effect of Methanol and Spray Tilt Angle on Pollutant Emission of a Diesel Engine Using Different Turbulence Models

Nkol,

Freidy,

Banta

et al. 2023

IJHT

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This study examines the effects of methanol injection and spray tilt angle on pollutant emissions, employing the standard k-ε and k-ε RNG turbulence models. The models were utilized to simulate combustion in a direct-injection diesel engine operating at 2000 rpm, with injection sprays at 60° and 63° tilt angles. The primary objective was to predict the combustion phenomena and associated pollutant emissions, with an aim towards optimizing engine performance. To this end, a Computational Fluid Dynamics (CFD) model was constructed and validated against experimental data drawn from the literature. The standard k-ε and the k-ε RNG turbulence models were selected for their ability to predict the large-scale structures arising from squish flows, generated by the spray at the given angles. These flow structures play a significant role in predicting pollutant formation, given their sensitivity to local temperatures within the combustion chamber. CFD modelling results reveal a significant impact of the combustion process on engine performance. Increases of approximately 10%, 25%, and 15% were observed in cylinder pressure, heat release, and temperature, respectively. Pollutant emissions also varied, with soot, CO, and HC levels increasing by 40%, 10%, and 60% respectively, and NO, NO2, and NOx levels decreasing by 30%, 10%, and 10%-60%, respectively. The findings suggest that the compressibility flow in the k-ε RNG turbulence model, particularly due to its isotropic term, exerts a notable influence on predicted combustion parameters, especially soot and NOx emissions. Moreover, the study highlights the significant role of methanol injection quantity, spray tilt angle, and turbulence model selection in engine performance, emphasizing the necessity for their careful consideration in engine modeling.

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Section: Methodsmentioning

confidence: 99%

Simulating the Effect of Methanol and Spray Tilt Angle on Pollutant Emission of a Diesel Engine Using Different Turbulence Models

Nkol,

Freidy,

Banta

et al. 2023

IJHT

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“…The essential factor needed to achieve diesel HCCI combustion is the mixture control, including charge components, temperature control throughout the combustion process, and high pre-ignition mixing rates [14]. The impact of piston bowl geometry on an engine's flow, turbulence, mixing, and combustion has been extensively ascertained in the literature [16][17][18][19][20][21][22][23]. Improvements in fuel-air mixing within the cylinder have the potential to greatly improve combustion, thereby increasing engine performance [24].…”

Section: Introductionmentioning

confidence: 99%

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

Nik Muhammad Hafiz Nik Ab Rashid,

Abdul Aziz Hairuddin,

Khairil Anas Md Rezali

et al. 2024

ARNHT

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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.

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“…It has been widely proven in the literature that the geometry of the piston bowl can affect flow, turbulence, mixing and combustion in an engine [18][19][20][21][22][23][24]. Any improvement in fuel-air mixing inside the cylinder can significantly enhance combustion, raising engine performance and reducing emissions [25].…”

Section: Introductionmentioning

confidence: 99%

Numerical study of piston bowl geometries on PFI-HCCI engine performance

Nik Ab Rashid,

Hairuddin,

Md Rezali

et al. 2023

JMES

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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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Effect of a novel piston geometry on the combustion process of a light-duty compression ignition engine: An optical analysis

Cited by 22 publications

References 30 publications

Simulating the Effect of Methanol and Spray Tilt Angle on Pollutant Emission of a Diesel Engine Using Different Turbulence Models

Simulating the Effect of Methanol and Spray Tilt Angle on Pollutant Emission of a Diesel Engine Using Different Turbulence Models

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

Numerical study of piston bowl geometries on PFI-HCCI engine performance

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