Numerical study of the effect of piston top contour on GDI engine performance under catalyst heating mode

Zheng, Zhimin; Liu, Chuntao; Tian, Xuefeng; Zhang, Xiaoyu

doi:10.1016/j.fuel.2015.04.054

Cited by 18 publications

(23 citation statements)

References 26 publications

(27 reference statements)

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“…Figure 4 shows a sample bowl piston used in a diesel engine, in which the bowl is utilised to confine the gasoline spray for good and fast combustion. The same does take place with a spark ignition engine, as faster burning is characterised by a compact combustion chamber [52]. Piston bowl configuration influences in-cylinder mixing in HCCI combustion engines.…”

Section: Bowl Piston Designmentioning

confidence: 95%

“…The piston bowl is commonly utilised in gasoline engines. HCCI engines do not have an ignition phase so that the piston crowns may form the combustion chamber [52]. Such engines use pistons with differently shaped crowns; as direct injection is becoming popular, gasoline engines may also use the same types of pistons.…”

Section: Bowl Piston Designmentioning

confidence: 99%

“…The last decade has seen advancements in piston technology. Zheng et al [52] suggested that adding silicone to aluminium will decrease piston expansion caused by heat present within the engine. Thermal expansion reduces piston seizure.…”

Section: Dome Piston Designmentioning

confidence: 99%

“…Thermal expansion reduces piston seizure. Silicone also increases the strength of the aluminium and reduces wear [52]. The flat-top piston has several merits, including less surface area, so it is lighter with a shorter, faster heat path to the cylinder wall.…”

Section: Dome Piston Designmentioning

confidence: 99%

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The use of different types of piston in an HCCI engine: A review

Aljaberi¹,

Hairuddin²,

Aziz³

2017

Int. J. Automot. Mech. Eng.

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Homogenous charge compression ignition (HCCI) combines the advantages of spark ignition (SI) and compression ignition (CI) engines to improve fuel consumption and emission levels. HCCI engines have the advantage of relatively higher engine efficiency than SI engines while maintaining lower emissions levels than CI engines. Combustion in HCCI engines occurs spontaneously at any location once the fuel-air mixture reaches its chemical activation energy. Pistons have a major effect on controlling the combustion inside the combustion chamber of an HCCI engine. Many researchers have studied various designs for pistons to improve HCCI engines. The aim of this study is to explore these different types of pistons and their designs in terms of improving the performance of HCCI engines fuelled with gasoline. The most common pistons used in HCCI are twostroke pistons, bowl types, specialised pistons, and dome-shaped pistons; each offers distinct advantages and disadvantages. Software simulation is the latest way of determining the best piston to be used for HCCI engines, as it is more cost effective and less time consuming than experiments. Overall, bowl type pistons offer reduced fuel consumption and a higher load capacity when used in an HCCI engine.

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Section: Bowl Piston Designmentioning

confidence: 95%

Section: Bowl Piston Designmentioning

confidence: 99%

Section: Dome Piston Designmentioning

confidence: 99%

Section: Dome Piston Designmentioning

confidence: 99%

See 2 more Smart Citations

The use of different types of piston in an HCCI engine: A review

Aljaberi¹,

Hairuddin²,

Aziz³

2017

Int. J. Automot. Mech. Eng.

View full text Add to dashboard Cite

show abstract

“…They found that the shallow bowl piston shape could improve the local velocities and TKE around the spark plugs compared with a deep piston bowl, and that the evaporation ratios of the bowl piston are comparable with those of the original flat piston. The effect of four piston shapes on GDI engine performance under catalyst heating mode was investigated by Zheng, Liu, Tian, and Zhang (2015) using simulation methods. The numerical results indicate that a piston with a flat top surface and pit is beneficial for improving the in-cylinder turbulence intensity, and helps to form a combustible mixture around the spark plug.…”

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

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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

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Modelling Spray in GDI Engines: Fuel Injection Modelling

Addepalli,

Mallikarjuna

2024

Energy, Environment, and Sustainability

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Numerical study of the effect of piston top contour on GDI engine performance under catalyst heating mode

Cited by 18 publications

References 26 publications

The use of different types of piston in an HCCI engine: A review

The use of different types of piston in an HCCI engine: A review

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

Modelling Spray in GDI Engines: Fuel Injection Modelling

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