Phenomenological combustion modeling of a direct injection diesel engine with in-cylinder flow effects

Im, Yong Hoon; Huh, Kang Y.

doi:10.1007/bf03185660

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…When the injection timing was set at 26° BTDC, the fuel was found to be sufficiently mixed with air before the ignition started, regardless of whether there was swirl or not. This finding was in good agreement with a previous computational study that indicated that the early injection timings led to longer ignition delays and promoted premixture formation . With regard to the swirl effect on combustion, the flame tended to be distributed around the cylinder wall without SCV (e.g., case a), whereas combustion occurred at the center of the chamber area with SCV (e.g., case b).…”

Section: Resultssupporting

confidence: 90%

Investigation of the Swirl Effect on Diffusion Flame in a Direct-Injection (DI) Diesel Engine Using Image Processing Technology

et al. 2008

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Swirl flow in a diesel engine can promote combustion efficiency and help suppress emissions. Optimal efficiency can also be achieved with optimized injection timing. The characteristics of the swirl flow generated by swirl control valves (SCVs) were investigated as well as the effects of swirl flow on combustion and flame characteristics in terms of various injection timings and air/fuel ratios. Flame visualizations and an imaging process were performed to examine the influence of swirl flow on the flame in a single-cylinder visualization diesel engine. It was found that swirl flow helped fuel to be distributed more uniformly in the combustion chamber, thereby decreasing ignition delay and promoting combustion efficiency. The flame was noticed to be distributed and exist for a long time in the center area of the combustion chamber by the swirl flow. Furthermore, the swirl interacting with squish flow near TDC was observed to give rise to quenching and shifting of the flame center during combustion in the chamber.

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Section: Resultssupporting

confidence: 90%

Investigation of the Swirl Effect on Diffusion Flame in a Direct-Injection (DI) Diesel Engine Using Image Processing Technology

et al. 2008

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“…This is in agreement with what reported by Kibum [22] when analysing flame visualizations in a single-cylinder optical diesel engine; when the injection timing was set at 26°BTDC, the fuel was found to be sufficiently mixed with air before the ignition started, regardless of whether there was swirl or not. This was in good agreement also with a previous computational study that indicated that the early injection timings promoted premixture formation [23]. The pilot fuel distribution in Figure 9 indicates that some fuel is always exposed to the glow plug in the crucial period close to TDC and that the main injection is into an area where conditions are primed for combustion even if swirl ratio is decreased from 1.6 to 1.0.…”

Section: Figures 4 and 5 Provide Detailed Fuel Distribution Informatisupporting

confidence: 91%

CFD Investigation on the Influence of In-Cylinder Mixture Distribution from Multiple Pilot Injections on Cold Idle Behaviour of a Light Duty Diesel Engine

Rocca

MacMillan

Shayler

et al. 2014

SAE Technical Paper Series

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Cold idle operation of a modern design light duty diesel engine and the effect of multiple pilot injections on stability were investigated. The investigation was initially carried out experimentally at 1000rpm and at −20°C. Benefits of mixture preparation were initially explored by a heat release analysis. Kiva 3v was then used to model the effect of multiple pilots on in-cylinder mixture distribution. A 60° sector of mesh was used taking advantage of rotational symmetry. The combustion system and injector arrangements mimic the HPCR diesel engine used in the experimental investigation. The CFD analysis covers evolutions from intake valve closing to start of combustion. The number of injections was varied from 1 to 4, but the total fuel injected was kept constant at 17mm 3 /stroke. Start of main injection timing was fixed at 7.5°BTDC. The experimental study shows that increasing the number of pilots improves stability and leads to fuel preparation resulting in higher initial peak rate of heat release. CFD results show that multiple pilot injections are capable of better fuel distribution; noticeable by injecting just one pilot compared to no pilot. A further pilot increases the surface area of the vapour cloud to a greater extent. Three pilots allow for fuel to be well distributed in the full bowl with no lean regions; a greater proportion of the fuel is exposed to the glow plug temperature. The glow plug is enclosed by a fuel cloud over a longer period of time as the number of pilot injections is increased.

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“…This method gave good agreement with the experimental results carried out in two diesel engines, Isuzu and Caterpillar. Yong et al [6] developed results of a simulation computer program in a direct injection diesel engine and compare it with tests carried out on a test bench by testing of two modelling combustion approaches (multi-zone model and in-cylinder flow model). A thermodynamic simulation model studied in the paper of Salah et al [7], shows its ability to predict the impact of operating conditions on the combustion characteristics of a constant volume engine.…”

Section: Introductionmentioning

confidence: 99%

The Heat Transfer Study in the Diesel Engine Combustion Chamber Using a Two-Zone Combustion Model

Menacer¹,

Naima²,

Bouchetara³

et al. 2020

MMEP

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The study of heat transfer phenomena in diesel engines is a very complex task considering the number of engine components such as intake and exhaust manifolds, lubricant oil and coolant subsystems, the different heat transfer mechanisms (conduction, convection, and radiation). This paper presents simulation results using a dual-zone model associated to GT-Suite simulation software for the calculation of convective heat transfer from gas to the cylinder wall, radiation heat transfer, gas pressure and temperature for low, partial and full load engine as a function of crank angle for a single-cylinder diesel engine. In this present article, a numerical simulation model was created to foresee the main combustion characteristics, and the simulated results were approved through the reference experiment data. Simulation results showed that any increase in the mass of fuel injected into the combustion chamber would generate a significant increase in the level of pressure and temperature of the combustion gases in the cylinder. This means that despite the improved power performance, excessive fuel consumption would have a negative effect on the thermal behavior and consequently on the life of the engine. The essential objective of any combustion engine development is to reduce fuel consumption while maintaining or improving the engine's power output.

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Phenomenological combustion modeling of a direct injection diesel engine with in-cylinder flow effects

Cited by 5 publications

References 13 publications

Investigation of the Swirl Effect on Diffusion Flame in a Direct-Injection (DI) Diesel Engine Using Image Processing Technology

Investigation of the Swirl Effect on Diffusion Flame in a Direct-Injection (DI) Diesel Engine Using Image Processing Technology

CFD Investigation on the Influence of In-Cylinder Mixture Distribution from Multiple Pilot Injections on Cold Idle Behaviour of a Light Duty Diesel Engine

The Heat Transfer Study in the Diesel Engine Combustion Chamber Using a Two-Zone Combustion Model

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