Numerical Analysis of the Piston Crown Geometry Influence on the Tumble and Squish in a Single Cylinder Engine

Vaz, Marilia Gabriela Justino; Amorim, Felipe Grossi L.; Ribeiro, Jean Helder M.; Huebner, Rudolf; Valle, Ramón Molina

doi:10.4271/2014-36-0300

Cited by 2 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dissipation of the tumble in the smaller vortex, as it encounters non-planar surfaces on the piston bowl, is a crucial characteristic for fuel distribution within the combustion chamber. However, it also dissolves flow energy, which is beneficial for the development of flames during the combustion process [42,43]. As for the heat release rate, the results revealed that the combustion occurred at various crank angle positions.…”

Section: In-cylinder Pressure and Heat Release Rate In Pfi Engine App...mentioning

confidence: 97%

“…Lastly, the third character encompasses a bowl design that can generate a substantial level of swirl, thereby facilitating the optimal air-fuel mixing for the combustion process. The models were chosen based on their performance on spark ignition (SI) and compression ignition (CI) engines by previous researchers and are presently being investigated in homogeneous charge compression ignition (HCCI) engines [41][42][43]. Fig.…”

Section: Simulation Setupmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

Section: In-cylinder Pressure and Heat Release Rate In Pfi Engine App...mentioning

confidence: 97%

Section: Simulation Setupmentioning

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

View full text Add to dashboard Cite

show abstract

“…PIV and computational fluid dynamics (CFD) to study the in-cylinder air motion in a diesel engine and reported that a center bowl on a flat piston is found to be the best combination of tumble ratio and energy efficiency. Vaz, Amorim, Ribeiro, Huebner, and Valle (2014) investigated the impact of the piston shape on the tumble coefficient and squish by simulating the air flow inside a single-cylinder research engine. They found that a flat piston maintains the tumble through the cycle until the compression phase because of the absence of barriers.…”

Section: Introductionmentioning

confidence: 99%

Effect of the piston top contour on the tumble flow and combustion features of a GDI engine with a CMCV: a CFD study

Yin

Zhang

Sun

et al. 2016

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

In spite of much progress in the development of gasoline direct injection (GDI) engines, choosing an appropriate piston top contour to obtain desirable combustion efficiency is still an arduous process for engineers. This study investigates the combined effects of piston bowl geometry and a charge motion control valve (CMCV) on tumble flow and combustion features in GDI engines. Based on the model validation, the processes of intake, spray, mixture formation and combustion at different engine speeds are simulated and analyzed for different piston shapes for the two cases of opening and closing the CMCV. The results show that the bowl on the top of piston is beneficial for the formation and development of tumble flow. The flat top piston with the CMCV closed is able to achieve acceptable combustion pressure. However, with the increase of engine speed and load, the advantages of the flat top pistons gradually disappear; the dual offset bowl piston has a minimum tumble ratio and turbulence kinetic energy (TKE) at the end of the compression stroke because of the projection in the middle of the piston top surface which leads to a lower pressure rise rate and a reduced flame propagation speed at high load. The closed CMCV contributes to a faster evaporation rate and a more uniform mixture at lower speeds. It is not recommended for use at high speeds due to lower intake air mass and reduced combustion pressure. The research provides an effective way for engineers to choose an appropriate piston top contour combined with a CMCV to obtain desirable combustion efficiency. ARTICLE HISTORY

show abstract

Numerical Analysis of the Piston Crown Geometry Influence on the Tumble and Squish in a Single Cylinder Engine

Cited by 2 publications

References 9 publications

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

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

Effect of the piston top contour on the tumble flow and combustion features of a GDI engine with a CMCV: a CFD study

Contact Info

Product

Resources

About