Model for predicting air-fuel mixing, combustion and emissions in DI diesel engines over whole operating range

Kuleshov, Andrey

doi:10.4271/2005-01-2119

Cited by 67 publications

(54 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…11, No. 8;2017 It show that actual flow rate of fresh mixture into the cylinder starts at some degrees after the inlet valve opens (around 10 o to 15 o or 3-5% of the suction process). This delay in the inflow of the fresh mixture causes loss in the engine's volumetric efficiency for all stroke lengths.…”

Section: Inlet and Exhaust Manifold Flow Conditionmentioning

confidence: 99%

See 1 more Smart Citation

Engine Manifold Wave Action under Variable Stroke Length

Yamin¹

2017

MAS

View full text Add to dashboard Cite

A theoretical investigation on the pressure wave action of the manifolds of a four-stroke, direct injection (hereinafter referred to as DI), water-cooled, 4-stroke, diesel engine with variable stroke length was carried out. The study was conducted over wide range of speeds (1000 -3000 RPM at an increment of 500 RPM) and stroke lengths (130 mm to 210 mm at an increment of 20mm). The compression ratio was kept constant by adjusting the piston bowl volume. The study showed that shorter stroke lengths created favorable pressure waves in both inlet and exhaust manifolds at lower speeds, which resulted in improved engine volumetric and thermal efficiencies. At higher speeds, the larger strokes were favorable, however, due to less time available for the suction and exhaust strokes to be executed, the efficiencies were low. Advancing valve timing was one factor that improved the engine performance with larger stroke lengths.

show abstract

Section: Inlet and Exhaust Manifold Flow Conditionmentioning

confidence: 99%

“…The main objective is to study how varying the stroke length affects the gas pressure variation inside the cylinder for a given valve timing. It will be conducted on compression ignition engine using the Diesel-RK software (Kuleshov, 2005) …”

Section: Introductionmentioning

confidence: 99%

Engine Manifold Wave Action under Variable Stroke Length

Yamin¹

2017

MAS

View full text Add to dashboard Cite

show abstract

“…For total flow in the combustion chamber, the kinetic energy associated with the average movement is [32,33]: (12) In the above equation, m is the total mass in the cylinder and K cyl production terms are mainly related to the kinetic energy of intake, exhaust flows and swirl. In Equation (12), swirl term is defined as: Diagram of the energy balance in the combustion chamber.…”

Section: Two States Turbulence Model: Modified K-k Modelmentioning

confidence: 99%

“…The latter models use a great number of empirical coefficients that require experimental measurements to be adjusted, resulting in a lack of predictive capability to accurately describe current challenges such as quasi HCCI combustion, premixed lean charge combustion, multi injection strategies or combustion with high EGR rate. Some phenomenological engine models have been designed to be directly used as a tool for car manufacturers in order to involve engine simulation in engine control design [9] or to explore alternative combustion systems in Direct Injection Diesel engines by providing useful information on spray penetration [10], by computing heat release during combustion with a detailed description of the Diesel jet [11], or by taking into account spray interaction with a swirl [12]. To satisfy both the accuracy and time requirements, the Probability Density Function (PDF) concept has been introduced together with some phenomenological spray models to consider the effects of spatial inhomogeneities, such as equivalence ratio distribution, on the combustion characteristics [13,14].…”

Section: Introductionmentioning

confidence: 99%

A Physics and Tabulated Chemistry Based Compression Ignition Combustion Model: from Chemistry Limited to Mixing Limited Combustion Modes

Bordet

Caillol

Higelin

et al. 2011

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

Résumé -Un modèle de combustion à allumage par compression basé sur la physique et la chimie tabulée : des modes de combustion contrôlés par la chimie jusqu'aux modes contrôlés par le mélange -Ce papier présente une nouvelle approche 0D phénoménologique pour prédire le déroulement de la combustion dans les moteurs Diesel à injection directe pour toutes les conditions d'utilisation usuelles. Le but de ce travail est de développer une approche physique en vue d'améliorer la prédiction de la pression cylindre et du dégagement d'énergie, avec un nombre minimum d'essais nécessaires à la calibration. Les contributions principales de cette étude sont la modélisation de la phase de pré-mélange de la combustion et une extension du modèle pour les stratégies d'injections multiples. Dans ce modèle, le taux de dégagement d'énergie dû à la combustion pour la phase pré-mélangée est relié à un taux de réaction moyen du carburant. Ce taux de réaction moyen de carburant est évalué à l'aide d'une approche basée sur un taux de réaction local de carburant tabulé et la détermination d'une fonction de densité de probabilité (PDF) de la fraction de mélange (Z). Cette PDF permet de prendre en compte la distribution de richesse existante dans la zone pré-mélangée. L'allure de cette PDF présumée est une β-fonction standardisée. Les fluctuations de la fraction de mélange sont décrites avec une équation de transport pour la variance de Z. La définition standard de la fraction de mélange, établie dans le cas de flammes de diffusion, est ici adaptée à une combustion pré-mélangée de type Diesel pour décrire l'inhomogénéité de la richesse dans le volume de contrôle. La chimie détaillée est décrite au travers de la tabulation du taux de réaction relatif à la flamme principale et du délai d'auto-inflammation relatif à la flamme froide, ces tabulations sont fonction de la variable d'avancement c, du taux de gaz brûlé ainsi que des grandeurs thermodynamiques telles que la température et la pression. Le modèle de combustion de diffusion est basé sur l'évaluation d'une fréquence de mélange qui est fonction du taux de turbulence dans la chambre et fonction de la masse de carburant vapeur disponible. Ce modèle de combustion est l'un des sous-modèles inclus dans le modèle thermodynamique de chambre de combustion basé sur une approche 2 zones différentiant gaz frais et gaz brûlés. De plus, un sous-modèle concernant la multi-injection a été développé pour prendre en compte les interactions entre les jets et pour décrire l'impact de la multi-injection sur le mélange air/carburant. Les résultats numériques ont été comparés aux mesures réalisées sur un moteur Diesel Renault de 2 litres. Pour l'ensemble des points de fonctionnement explorés, une bonne correspondance a été obtenue entre les résultats issus des simulations et les mesures expérimentales. Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 66 (2011) and Technology -Rev. IFP Energies nouvelles, Vol. 66 (2011) , No. 5, pp. 823-843 Copyright © 2011, IFP Energies nouvelles DOI: 10.25...

show abstract

“…modifying engine design. It presents different approach (though not new since it is used for SI engines [15] ) but it has never been studied (to the best of the authors' knowledge) for compression ignition engines. It is called the variable injector location technology.…”

Section: Introductionmentioning

confidence: 99%

Environmental Pollution Assessment of Different Diesel Injector Location Of Direct-Injection Diesel Engines: Theoretical Study

Abu-Nameh¹,

Yamin²

2008

American J. of Environmental Sciences

View full text Add to dashboard Cite

An Analytical investigation on the effect of injector location of a four-stroke DI diesel engine on its pollutants' emissions was carried out under different injector locations ranging from central to peripheral at different engine speeds ranging from 1000 rpm to 3000 rpm. The simulation results clearly indicated the advantages and disadvantages of the central location over the peripheral one. It revealed that near central location gave less carbon dioxide, smoke level and particulate matter on one hand, and higher levels of NOx, cylinder temperature and pressure (hence increased the mechanical and thermal stresses) on the other hand. Further, near central location resulted in more rapid rate of burning and less duration of combustion and rapid rate of NOx formation per crank angle.

show abstract

Model for predicting air-fuel mixing, combustion and emissions in DI diesel engines over whole operating range

Cited by 67 publications

References 10 publications

Engine Manifold Wave Action under Variable Stroke Length

Engine Manifold Wave Action under Variable Stroke Length

A Physics and Tabulated Chemistry Based Compression Ignition Combustion Model: from Chemistry Limited to Mixing Limited Combustion Modes

Environmental Pollution Assessment of Different Diesel Injector Location Of Direct-Injection Diesel Engines: Theoretical Study

Contact Info

Product

Resources

About