Simulation of the Intake and Compression Strokes of a Motored 4-Valve Si Engine with a Finite Element Code

Bailly, O.; Buchou, C.; Floch, Alain; Sainsaulieu, Lionel

doi:10.2516/ogst:1999010

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…gravity). Turbulence was modelled through a standard k-e model, which is commonly employed for performing steady and dynamic engine simulations [3,7,[12][13][14][15]. The transport equations for the turbulent kinetic energy k and the turbulence dissipation rate e are Swirl.…”

Section: Numerical Proceduresmentioning

confidence: 99%

In-cylinder flow control in a four-valve spark ignition engine: numerical and experimental steady rig tests

Ramajo

Zanotti

Nigro

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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Computational fluid dynamic (CFD) simulations and experimental steady flow tests (flow discharge, swirl, and tumble) were carried out to study the in-cylinder flow in a commercial four-valve spark ignition engine. The present investigation was aimed at analysing and controlling the generation of macro-vortex structures (swirl and tumble) during the inlet process. A comparative study of the most commonly employed tumble benches along with in-house design was performed, the last showing some advantages with respect to the others. The outcomes from the simulations were in agreement with experimental results. Mainly, the tumble generation rate was in general proportional to the valve lift. However, tumble was reduced drastically at medium valve lift due to a change in the vortex pattern. A stagnation zone was observed between inlet valves. CFD calculations successfully captured this tumble-fall effect, which was related to characteristic changes in the vortex pattern downstream of the inlet valves at medium valve lift. This affects tumble production without affecting the mass flowrate efficiency. Finally, at high valve lifts the tumble production and the vortex pattern were recovered. The capability of the cylinder head to induce swirl, tumble, or combined swirl-tumble by modifying the valve timing or by introducing adjustable flow deflectors was evaluated using CFD. Several valve timing strategies were analysed: some of them produced significant swirl, but introduced high mass flowrate losses. On the other hand, adjustable flow deflectors were shown to be an interesting alternative to induce swirltumble at low load and to improve tumble at high load.

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Section: Numerical Proceduresmentioning

confidence: 99%

In-cylinder flow control in a four-valve spark ignition engine: numerical and experimental steady rig tests

Ramajo

Zanotti

Nigro

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The resulting forecast provides a detailed picture of the characteristics of the air-fuel mixture along the intake tract. Bailly, Buchou, and Floch [8] developed a computational code for a hybrid finite element tetrahedral finite element method for engine simulation. A comparison was made between the calculation and measurement of the engine intake and compression stages.…”

Section: Introductionmentioning

confidence: 99%

Gasoline Engine Inlet Structure Design and Performance Analysis

Zhang,

Wang,

Wang

2024

AJST

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By creating a three-dimensional model of the intake pipeline, using AVL software to mesh and virtual simulation experiments, using the control variable method, changing the temperature conditions and pressure conditions one by one to observe the flow of the air pipe and the cylinder, and observing the numerical changes of the flow direction coefficient and tumbling flow ratio, the best solution was found. Through the virtual simulation experiment of the 3D model, the influence of external factors such as temperature and pressure on the air flow in the cylinder is obtained. The relationship between the characteristic parameters of the air intake tract was found through AVL numerical simulation, and the established three-dimensional model could accurately obtain the data after testing, which provided theoretical proof for the subsequent optimization scheme. The experimental results show that the tumbling flow ratio is increased as much as possible without changing the flow coefficient and the fuel economy of the engine is improved. But it also affects the flow coefficient, making it go down. Temperature has little effect on the flow in the cylinder. The flow velocity in the cylinder changes significantly under different pressures, and the area of the vortex area increases.

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The Method of Collocations and Least Residuals Combining the Integral Form of Collocation Equations and the Matching Differential Relations at the Solution of PDEs

Shapeev

Vorozhtsov

2017

Computer Algebra in Scientific Computing

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Simulation of the Intake and Compression Strokes of a Motored 4-Valve Si Engine with a Finite Element Code

Cited by 6 publications

References 11 publications

In-cylinder flow control in a four-valve spark ignition engine: numerical and experimental steady rig tests

In-cylinder flow control in a four-valve spark ignition engine: numerical and experimental steady rig tests

Gasoline Engine Inlet Structure Design and Performance Analysis

The Method of Collocations and Least Residuals Combining the Integral Form of Collocation Equations and the Matching Differential Relations at the Solution of PDEs

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