Numerical investigation of injection parameters and piston bowl geometries on emission and thermal performance of DI diesel engine

Rizvi, Ikhtedar Husain; Gupta, Rajesh

doi:10.1007/s42452-021-04633-1

Cited by 10 publications

(5 citation statements)

References 34 publications

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“…The same types of results were presented by Jafari et al 54 and Rizvi and Gupta. 55 In other words, at early main SOI timings, due to higher diesel spray kinetic energy, mixture formation can be enhanced and prevent high level of fuel coagulation especially at spray-wall interaction zones. As can be seen in this figure, at CDC operating conditions, the application of stepped-lip and wide-shallow chambers shifted the most portion of air-fuel mixture to the cold regions of cylinder like piston crevices and cylinder walls, especially at late main SOI timings.…”

Section: Numerical Achievementsmentioning

confidence: 99%

A numerical study of piston bowl geometry and diesel injection timing in a heavy-duty diesel/syngas RCCI engine

Seddiq

Delprete

Brusa

et al. 2023

International Journal of Engine Research

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The current numerical study aims to examine the single and combined effects of various piston bowl geometries, diesel main Start of Injection (SOI) timing, and syngas energy ratio on the combustion characteristics, specific emissions (g/kW·h), energy distribution, and exergy of a heavy-duty off-road Reactivity-Controlled Compression Ignition (RCCI) diesel engine. The examined geometries include the stock chamber (baseline combustion chamber), wide-shallow chamber, dual-swirl chamber, stepped-lip chamber. The main SOI timing was varied from −20 to −5 Crank Angle (CA) After Top Dead Center (ATDC) with 5 CA steps. Also, syngas energy ratio including 0% Conventional Diesel Combustion (CDC) mode, 20%, 40%, and 60% of total fuel energy per cycle. To accomplish this goal, the SAGE combustion model coupled with a reduced chemical kinetic mechanism consists of 360 reactions, and 72 species was applied to conduct this investigation. The numerical findings showed that the use of the wide-shallow chamber extended the engine operable range under diesel-syngas combustion operating conditions. In comparison to the baseline CDC case, the application of the dual-swirl chamber under CDC conditions, and main SOI timing of −15 CA ATDC led to reduction of Carbon Monoxide ([Formula: see text]), Hydro-Carbon ([Formula: see text]), Particle Matter ([Formula: see text]), Carbon Dioxide ([Formula: see text]), Indicated Specific Energy Consumption (ISEC), Gross Indicated Efficiency (GIE), and exergy efficiency but with a Nitrogen Oxides ([Formula: see text]) penalty rate. In general, an increase in the bore to bowl diameter ratio caused a shorter ignition delay period and combustion duration. The utilization of the stepped-lip chamber at both CDC and diesel-syngas combustion operating modes resulted in a shorter ignition delay period, but a longer combustion duration. Nonetheless, the stepped-lip combustion chamber reduced the diffusive flame temperature. Also, it is noteworthy that the utilization of the stock chamber along with the main SOI timing at −5 CA ATDC under diesel-syngas 60% combustion mode is a suitable technique to pass EURO-VI [Formula: see text] and [Formula: see text] emissions regulations.

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Section: Numerical Achievementsmentioning

confidence: 99%

A numerical study of piston bowl geometry and diesel injection timing in a heavy-duty diesel/syngas RCCI engine

Seddiq

Delprete

Brusa

et al. 2023

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…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%

“…The latest Computer Fluid Dynamic (CFD) software employs a highly efficient coupling of detailed chemical kinetics, liquid fuel spray and turbulent gas dynamics in order to simulate combustion processes occurring in an internal combustion engine. However, the majority studies on the piston geometry conducted in the CFD approach have focused on CI engines [20,30,31]. Regarding the HCCI-PFI engine, most studies have yet to be conducted on the piston bowl geometry design [32][33][34][35].…”

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%

“…The latest Computer Fluid Dynamic (CFD) software uses a highly efficient coupling of detailed chemical kinetics, liquid fuel spray and turbulent gas dynamics to simulate combustion processes in an internal combustion engine. Most studies on the piston geometry employed in CFD, however, have focused on CI engines [22,30,31]. Regarding HCCI, most studies do not emphasise on piston geometry design [32][33][34][35].…”

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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Numerical investigation of injection parameters and piston bowl geometries on emission and thermal performance of DI diesel engine

Cited by 10 publications

References 34 publications

A numerical study of piston bowl geometry and diesel injection timing in a heavy-duty diesel/syngas RCCI engine

A numerical study of piston bowl geometry and diesel injection timing in a heavy-duty diesel/syngas RCCI engine

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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