The Development and Application of a Diesel Ignition and Combustion Model for Multidimensional Engine Simulation

Kong, Song‐Charng; Han, Zhiyu; Reitz, Rolf D.

doi:10.4271/950278

Cited by 422 publications

(168 citation statements)

References 39 publications

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“…Other results of liquid penetration, spray angles and SMD for different cases are documented by Sarre et al (1999). The present spray model was also applied with a characteristic-time combustion model (Kong et al, 1995) to simulate combustion in a Cummins optical-access engine (Dec, 1997). The nozzle geometry data and injection profile are needed for inputs without the need to estimate the injector discharge coefficient.…”

Section: Model Validation -Diesel Spraysmentioning

confidence: 99%

Developments in Spray Modeling in Diesel and Direct-Injection Gasoline Engines

Kong

Senecal

Reitz

1999

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Progrès de la modélisation des sprays dans les moteurs Diesel et à essence -Dans les moteurs à injection directe, les caractéristiques du spray de carburant influent directement sur le rendement et les émis-sions. Les performances des modèles de spray existants et leur influence sur la combustion pour les moteurs Diesel et essence à injection directe sont analysées. Un modèle phénoménologique d'écoulement dans les injecteurs indiquant les effets de la géométrie sur les processus d'injection est présenté. Ce modèle donne les conditions initiales d'un modèle d'atomisation prenant en compte les instabilités de Kelvin-Helmholtz (KH) et Rayleigh-Taylor (RT). Une analyse de stabilité linéaire a aussi été menée pour prendre en compte l'atomisation des nappes liquides caractéristiques des injecteurs à swirl des moteurs à essence. Des résultats de simulations Diesel ont été comparés aux données obtenues avec des diagnostics laser sur des moteurs à accès optique Diesel ID de fort alésage pour une large gamme de conditions opératoires. Les résultats montrent que le modèle d'injecteur utilisé en combinaison avec le modèle d'atomisation (KH + RT) donne des résultats réalistes. En particulier, la courte pénétration liquide et les détails de forme des flammes sont bien reproduits. Le modèle d'atomisation de nappe a aussi été comparé avec succès à des pénétrations expérimentales et des données de taille de gouttes pour des injecteurs en cône creux. Ce modèle est en cours d'utilisation pour l'étude de la combustion en mode stratifié dans les moteurs GDI.Mots-clés : sprays, Diesel, modélisation, Kelvin-Helmholtz, Rayleigh-Taylor, injection directe. Kelvin-Helmholtz (KH) Abstract -Developments in Spray Modeling in Diesel and Direct-Injection Gasoline Engines -In directinjection engines the fuel spray characteristics influence the combustion efficiency and exhaust emissions. The performance of available spray models for predicting liquid and vapor fuel distributions, and their influence on combustion is reviewed for both diesel and gasoline direct injection engines. A phenomenological nozzle flow model is described for simulating the effects of diesel injector nozzle internal geometry on the fuel injection and spray processes. The flow model provides initial conditions for the liquid jet breakup model that considers wave instabilities due to

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Section: Model Validation -Diesel Spraysmentioning

confidence: 99%

Developments in Spray Modeling in Diesel and Direct-Injection Gasoline Engines

Kong

Senecal

Reitz

1999

Oil & Gas Science and Technology - Rev. IFP

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“…The combustion model is based on the laminar and turbulent characteristic-time approach (Kong et al, 1995;Tanner and Reitz, 1999;Ayoub and Reitz, 1995). The fuel combustion in the burning region is described by the following equation (Ramos, 1989):…”

Section: Combustionmentioning

confidence: 99%

Combustion Noise and Pollutants Prediction for Injection Pattern and Exhaust Gas Recirculation Tuning in an Automotive Common-Rail Diesel Engine

Arsie

Leo²,

Pianese³

et al. 2014

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

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-In the last years, emissions standards for internal combustion engines are becoming more and more restrictive, particularly for NO x and soot emissions from Diesel engines. In order to comply with these requirements, Original Equipment Manufacturers (OEM) have to face with innovative combustion concepts and/or sophisticate after-treatment devices. In both cases, the role of the Engine Management System (EMS) is increasingly essential, following the large number of actuators and sensors introduced and the need to meet customer expectations on performance and comfort. On the other hand, the large number of control variables to be tuned imposes a massive recourse to the experimental testing which is poorly sustainable in terms of time and money. In order to reduce the experimental effort and the time to market, the application of simulation models for EMS calibration has become fundamental. Predictive models, validated against a limited amount of experimental data, allow performing detailed analysis on the influence of engine control variables on pollutants, comfort and performance. In this paper, a simulation analysis on the impact of injection pattern and Exhaust Gas Recirculation (EGR) rate on fuel consumption, combustion noise, NO and soot emissions is presented for an automotive Common-Rail Diesel engine. Simulations are accomplished by means of a quasi-dimensional multi-zone model of in-cylinder processes. Furthermore a methodology for in-cylinder pressure processing is presented to estimate combustion noise contribution to radiated noise. Model validation is carried out by comparing simulated in-cylinder pressure traces and exhaust emissions with experimental data measured at the test bench in steady-state conditions. Effects of control variables on engine performance, noise and pollutants are analyzed by imposing significant deviation of EGR rate and injection pattern (i.e. rail pressure, start-of-injection, number of injections). The results evidence that quasi-dimensional in-cylinder models can be effective in supporting the engine control design toward the optimal tuning of EMS with significant saving of time and money.

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“…There are many variants, according to the choices of SLK representation, transition criterion (typically the level or rate of change of temperature) between ignition and combustion and form of EBU, along with other details. A model of this kind, incorporating a variant of the well-known Magnussen [54] EBU has been developed at the University of Wisconsin by Reitz and coworkers [55] and successfully used by them to predict combustion in large truck engines [56], apparently with limited need to ÒtuneÓ model coefficients. However experience of use of this and other SLK/EBU variants for smaller engines by various workers (e.g.…”

Section: Diesel Combustion and Emissionsmentioning

confidence: 99%

State of the Art of Multi-Dimensional Modeling of Engine Reacting Flows

Gosman

1999

Oil & Gas Science and Technology - Rev. IFP

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RŽsumŽ Ñ ƒtat de lÕart de la modŽlisation multidimensionnelle pour les Žcoulements rŽactifs dans les moteurs Ñ Cet article dresse un aper•u de lÕŽtat de lÕart et des perspectives de lÕutilisation de la modŽlisation 3D pour lÕanalyse et le dŽveloppement des moteurs. Les aspects abordŽs comprennent lÕacquisition des gŽomŽtries, la gŽnŽration des maillages, les mŽthodologies numŽriques, la modŽlisation mathŽmatique des phŽnom•nes physiques importants, lÕexploitation des calculateurs parall•les et lÕapplication industrielle. Les conclusions principales de cette analyse font appara"tre les points suivants : Ð les mŽthodologies numŽriques et la gŽnŽration des maillages, associŽes au calcul parall•le, permettent maintenant de raccourcir notablement le cycle total de simulation ; Ð la modŽlisation physique a atteint sa maturitŽ dans la plupart des aspects relatifs ˆ la simulation de la combustion en allumage commandŽ ; en revanche, elle reste encore ˆ acquŽrir en ce qui concerne la combustion Diesel et certains aspects des processus reliŽs aux sprays ; Ð globalement, lÕutilisation de la simulation 3D pour la conception des moteurs est en forte augmentation ; Ð les dŽveloppements futurs, dont lÕutilisation de la LES, promettent une amŽlioration croissante des rŽsultats.Mots-clŽs : moteur, combustion, simulation 3D, aper•u. Abstract Ñ State of the Art of Multi-Dimensional Modeling of Engine Reacting Flows

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The Development and Application of a Diesel Ignition and Combustion Model for Multidimensional Engine Simulation

Cited by 422 publications

References 39 publications

Developments in Spray Modeling in Diesel and Direct-Injection Gasoline Engines

Developments in Spray Modeling in Diesel and Direct-Injection Gasoline Engines

Combustion Noise and Pollutants Prediction for Injection Pattern and Exhaust Gas Recirculation Tuning in an Automotive Common-Rail Diesel Engine

State of the Art of Multi-Dimensional Modeling of Engine Reacting Flows

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