Universal Diesel Engine Simulator (UniDES): 1st Report: Phenomenological Multi-Zone PDF Model for Predicting the Transient Behavior of Diesel Engine Combustion

Inagaki, Kenji; Ueda, Matsuei; Mizuta, Junichi; Nakakita, Kiyomi; Nakayama, Shigeki

doi:10.4271/2008-01-0843

Cited by 25 publications

(15 citation statements)

References 11 publications

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“…ら圧縮行程後期までの幅広い範囲で変化させ，さらに排気バルブ 2 度開き方式により既燃ガスの導入量や導入時期を変化させる制御システムを検討対象とする．このようなシステムの制御系の検討に際し，混合気の分布を考慮した計算負荷の低いモデルが必要となる．ディーゼルエンジンを対象にしたものとして，0 次元の燃焼シミュレーションツールである UNIDES (Inagaki et al, 2008)や，池上ら(池上他，1999)，Tunér ら…”

Section: 自己着火燃焼を幅広い運転範囲で実現するための方法の一つとして，本研究では噴射時期を吸気行程開始時かunclassified

Modeling of auto ignition combustion with inhomogeneous mixture

Uesugi

Yamasaki

Kaneko

et al. 2017

Transactions of the JSME (In Japanese)

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To predict the combustion characteristic of auto ignition combustion in internal combustion engines, it is necessary to consider the inhomogeneity of the fuel, EGR and air in the mixture. In this research, a PDF (Probability Density Function) combustion model considering the influence of the inhomogeneity of mixture on the auto ignition combustion is developed. In our approach, the PDF of the injected fuel and the EGR gas is predicted by two-zone turbulent mixing model and only the PDF at the top dead center of the combustion stroke is used to calculate combustion characteristic to realize the reasonable calculation time for the control system design tool. The prediction model was validated by comparing with the experimental result for various injection timings and EGR ratios. It found that the model can qualitatively predict the combustion characteristics with reasonable calculation time.

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Section: 自己着火燃焼を幅広い運転範囲で実現するための方法の一つとして，本研究では噴射時期を吸気行程開始時かunclassified

Modeling of auto ignition combustion with inhomogeneous mixture

Uesugi

Yamasaki

Kaneko

et al. 2017

Transactions of the JSME (In Japanese)

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“…Especially the injection parameters directly determine the fuel spray behaviors that affect the mixture formation significantly; as a result, the combustion characteristics are varied. Thereby, in order to capture the major features of combustion under multi-stage injection conditions, each injection is customarily treated to form a spray region, and relevant calculations including spray propagation, fuel evaporation, turbulent mixing, ignition, and chemical reaction are performed for each spray [15][16][17][18]. The challenges compared with single injection calculation come from the complicated additional influences of the former spray on the later spray.…”

Section: Introductionmentioning

confidence: 99%

“…The spray behaviors after EOI are indicated quite different from that during injection by the fundamental studies on turbulent gas and diesel jets [19][20][21][22][23]. However, there is no zero-dimensional spray model to describe the spray development and air entrainment after EOI, and the spray-to-spray interaction models employed by a few researchers [16][17][18] require improvement for more precise prediction of combustion processes.…”

Section: Introductionmentioning

confidence: 99%

Combustion modelling for a diesel engine with multi-stage injection using a stochastic combustion model

Liu

Horibe

Ishiyama

2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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This study presents the development of a phenomenological combustion model to simulate the combustion processes in diesel engines with multi-stage fuel injection. A newly developed zero-dimensional spray propagation model and a model of spray-to-spray interaction were combined with a stochastic combustion model, which had been developed for diesel combustion calculation in the cases of single-stage injection. In this model, the combustion chamber is divided into an ambient air zone and several spray zones, where the spray formed by each injection is treated as a spray zone. Turbulent mixing, fuel evaporation, heat loss, and chemical reactions, are calculated in each spray zone respectively. A zero-dimensional spray propagation model including the spray evolution after the end of injection (EOI) and the model of interaction between the sprays from sequent injections are developed to describe the spray behavior for the case of multistage injection. Then the developed combustion model is validated against the experimental data from a single-cylinder DI diesel engine with pilot/main two-stage injection, in which the pilot injection conditions are varied with fixed main injection timing. Based on the analysis of heat release rate, entrainment rate, and the microscopic information inside the spray, such as probability density function (PDF) of equivalence ratio, the effects of wall impingement and interaction between adjacent sprays on fuel-air mixing rate and entrainment rate are formulized and employed to reproduce the measured histories of heat release rate. Reduction of fuel-air mixing rate is considered when the spray flows into the squish region after the wall impingement, which is effective to capture the measured decrease of pilot spray's heat release with advancing pilot injection timing. The effects of wall impingement of the main spray and the interaction between adjacent sprays are modeled to reproduce the heat release rate during the initial and later part of the mixing-controlled combustion. After these improvements, heat release rates of the test engine when varying the pilot injection conditions have been successfully predicted.

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“…These parameters in Equations (12,13) and (14) are chosen constant for all simulations. Spray sub model parameters were identified on experimental results performed with a Bosh injector in a closed pressurized constant-volume vessel.…”

Section: Model Calibrationmentioning

confidence: 99%

“…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]. For reliable simulation of the initiation of the combustion by Auto Ignition of the fuel and the following pre-mixed combustion, detailed chemical kinetic models have been introduced together with combustion models [15].…”

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

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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...

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Universal Diesel Engine Simulator (UniDES): 1st Report: Phenomenological Multi-Zone PDF Model for Predicting the Transient Behavior of Diesel Engine Combustion

Cited by 25 publications

References 11 publications

Modeling of auto ignition combustion with inhomogeneous mixture

Modeling of auto ignition combustion with inhomogeneous mixture

Combustion modelling for a diesel engine with multi-stage injection using a stochastic combustion model

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

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