A real-time capable mixing controlled combustion model for highly diluted conditions

Dowell, Peter G.; Akehurst, Sam; Burke, Richard

doi:10.1016/j.energy.2017.05.171

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…W pozostałych wypadkach opisowi podlegają modele trzystrefowe. Przykładem takiego modelu jest 2 Zone Mixing Controlled Combustion model [8]. Podobnie jak w przypadku rozszerzonego modelu Vibe i w tym modelu proces spalania jest opisany równaniami, odpowiadającymi spalaniu kinetycznemu i dyfuzyjnemu, przy czym przebieg spalania zależy od funkcji ilości paliwa oraz funkcji gęstości kinetycznej energii turbulencji.…”

Section: Modele Bezwymiaroweunclassified

Overview of combustion process models in a cylinder of piston engine

Cuper-Przybylska

2018

atest

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The article presents an overview of models used to calculate combustion process parameters in piston engines. One of the applied techniques is modelling based on the mathematical description of physical phenomena. The level of complexity of such a description depends, however, on the purpose of the model, the efficiency of calculations and the possibility of obtaining reliable measurement data. The paper presents various methods of modelling phenomena occurring in the cylinder of a Diesel engine. Presented are assumptions and effects of modelling using models from 0-dimensional and single-zone to complex 3-dimensional models, describing the phenomena of turbulent mass movements using computer fluid mechanics.

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Section: Modele Bezwymiaroweunclassified

Overview of combustion process models in a cylinder of piston engine

Cuper-Przybylska

2018

atest

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“…Katrasnik [28,29] put forward an innovative mechanistically based spray model intended for use in the MCC model of a four stroke engine, and split the combustion into three phases by splitting the diffusion combustion into a rich combustion (in the centre of the spray) and a lean combustion (edges of the spray). Dowell et al [30] further extended the MCC model to EGR (exhaust gas recirculation) engine simulation. These models can accurately predict the heat release rate of diesel engines and can be used for real-time performance simulation of diesel engines.…”

Section: Introductionmentioning

confidence: 99%

A Zero-Dimensional Mixing Controlled Combustion Model for Real Time Performance Simulation of Marine Two-Stroke Diesel Engines

et al. 2019

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The paper presents a performance prediction model of marine low-speed two-stroke diesel engines based on an advanced MCC (mixture controlled combustion) model coupled with a fuel injection model. Considering the time of real calculation, the so-called “concentrated exhausting gas” scavenging model and the working process model are used in the present work, and improved by introducing the ratio of pure combustion product over the total gas mass in the cylinder as an expression of the working medium components. The reaction rate model in the zero-dimensional MCC model is improved by introducing the fraction of combustion product in the fuel spray, and the relationship between the combustion model and scavenging quality is established. Meanwhile, the combustion model was simplified in the diffusion combustion phases and integrated with the fuel injection model in order to respond to the change of injection profile and injection timing. A large-scale low-speed marine diesel engine was used for a simulation. The results of the whole model are consistent with experimental data and the speed of calculation is fast enough for real time simulation of low speed and medium speed diesel engines. The prediction model can be used in the design and calibration of the electronic control system and performance optimization of the marine two-stroke diesel engine.

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“…Therefore, in recent years, high exhaust gas recirculation (EGR) and flexible two-stage fuel injection [4][5][6][7][8][9] are becoming increasingly popular due to their capability to control combustion temperature and fuel/oxygen ratio. Homogeneous charge compression ignition (HCCI) combustion [10,11], low temperature combustion [12] and high dilution combustion [13,14] are successful new combustion concepts for reducing engine-out toxic emissions by reducing oxygen and combustion temperature using high EGR, however, at the expense of high fuel consumption [15] and a narrow operation range in HCCI combustion [16]. Combustion efficiency also deteriorates [17] due to the high dilution effects of EGR.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Effects of Assigned EGR Stratification on a Heavy Duty Diesel Engine with Two-Stage Fuel Injection

Shen

Cui

et al. 2018

Energies

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External exhaust gas recirculation (EGR) stratification in diesel engines contributes to reduction of toxic emissions. Weak EGR stratification lies in that strong turbulence and mixing between EGR and intake air by current introduction strategies of EGR. For understanding of ideal EGR stratification combustion, EGR was assigned radically at −30 • CA after top dead center (ATDC) to organize strong EGR stratification using computational fluid dynamics (CFD). The effects of assigned EGR stratification on diesel performance and emissions are discussed in this paper. Although nitric oxides (NO x) and soot emissions are both reduced by means of EGR stratification compared to uniform EGR, the trade-off between NO x and soot still exists under the condition of arranged EGR stratification with different fuel injection strategies. A deterioration of soot emissions was observed when the interval between main and post fuel injection increased, while NO emissions increased first then reduced. The case with a 4 • CA interval between main and post fuel injection is suitable for acceptable NO and soot emissions. Starting the main fuel injection too early and too late is not acceptable, which results in high NO emissions and high soot emissions respectively. The start of the main fuel injection −10 • CA ATDC is suitable.

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A real-time capable mixing controlled combustion model for highly diluted conditions

Cited by 5 publications

References 35 publications

Overview of combustion process models in a cylinder of piston engine

Overview of combustion process models in a cylinder of piston engine

A Zero-Dimensional Mixing Controlled Combustion Model for Real Time Performance Simulation of Marine Two-Stroke Diesel Engines

Numerical Investigation on Effects of Assigned EGR Stratification on a Heavy Duty Diesel Engine with Two-Stage Fuel Injection

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