3D-CFD Modeling of Conventional and Alternative Diesel Combustion and Pollutant Formation - A Validation Study

Priesching, Peter; Ramusch, G.; Ruetz, J.; Tatschl, Reinhard

doi:10.4271/2007-01-1907

Cited by 26 publications

(23 citation statements)

References 10 publications

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“…Z tego powodu modele cząstkowe składające się na model całego procesu są stale doskonalone. Najnowsze wersje stosowanych modeli z dużą dokładnością oddają charakterystykę procesów wtrysku i spalania paliwa [9]. Z tego powodu obecnie każda konstrukcja silnika o zapłonie samoczynnym jest optymalizowana przy użyciu komputerowych metod symulacyjnych.…”

Section: Model Procesu Spalania W Cylindrach Silnikaunclassified

Model of the combustion process in the marine 4-stroke diesel engine

Kowalski¹

2015

Mechanik

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MODEL OF THE COMBUSTION PROCESS IN THE MARINE 4-STROKE DIESEL ENGINE SUMMARY Manuscript presents a model of the combustion process in marine four-stroke diesel engine to determine the nitric oxides fraction (NOx) in the exhaust gas. This is iterative, 3-dimensional model, built on geometric mesh of the engine cylinder chamber. The model includes mathematical description of fuel injection, spray, evaporation and auto ignition and flame propagation in the cylinder. In order to determine the NOx fraction, the heat exchange phenomena description between structural elements of the cylinder has been done. The input data and boundary conditions are collected from the direct measurements. The model has been successfully validated based on the characteristics of the in-cylinder combustion pressure and NOx and oxygen fractions in the exhaust gas for all considered loads of the engine.

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Section: Model Procesu Spalania W Cylindrach Silnikaunclassified

Model of the combustion process in the marine 4-stroke diesel engine

Kowalski¹

2015

Mechanik

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“…Where and , as the critical equivalence ratio above which there is not enough oxygen to complete the oxidation of fuel into CO [13], (4) It can be seen from the equation above that for a lean mixture with α = 1 the first two reactions are considered, which means that CO can also be formed under lean conditions. The third reaction describes the CO formation under rich conditions where there is not enough oxygen to burn all the fuel to CO 2 .…”

Section: (3)mentioning

confidence: 99%

“…Firstly, the fuel is partly oxidized to CO and to CO 2 , followed by CO oxidation and finally a post-flame equilibrium chemistry approach is applied which results in the final species concentrations. [13]. Assuming the mean fuel composition is C n H m and the local mean equivalence ratio , then the main fuel oxidation is defined in the ECFM − 3Z model with the following reactions in Eq.2.…”

Section: Post Flame Chemistrymentioning

confidence: 99%

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Analysis the ECFM-3Z Combustion Model for Simulating the Combustion Process and Emission Characteristics in a HSDI Diesel Engine

Mobasheri

2015

International Journal of Spray and Combustion Dynamics

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An advanced CFD simulation has been performed to analyze the ECFM-3Z (Extended CoherentFlame Model-3Z) combustion model for simulating the combustion process and emission characteristics in a high speed direct injection (HSDI) diesel engine. A four cylinders, HSDI diesel engine based on a Ford production engine with a 2 nd generation Delphi common rail fuel injection system has been modeled in this research. 3D CFD simulation was carried out from intake valve closing (IVC) to exhaust valve opening (EVO). A good agreement of calculated and measured in-cylinder pressure trace as well as pollutant formation trends could be observed for all investigated operating points. Based on the confidence gained from validation, the study is extended to evaluate the effect of fuel injection timing on engine performance and emissions. For this purpose, a comprehensive study of the effect of injection timing with respect to performance and emissions has been considered. Three main injection timing, (1) 2.65 BTDC, (2) 0.65 BTDC and (3) 1.35 ATDC, all with 30 crank angle pilot separations has been used to investigate the effect of the injection timing. The results show that the current methodology can be applied as a beneficial tool for analyzing the parameters of the diesel combustion under HSDI operating condition.International journal of spray and combustion dynamics Volume · 7 · Number · 4-pages 353 -372 353 *Corresponding author e-mail: r.mobasheri@abru.ac.ir INTRODUCTIONPerformance and emission characteristics in diesel engines is strongly dependent on characteristics of the in-cylinder mixture formation and combustion processes governed by the fuel spray propagation and its interaction with the in-cylinder swirling flow field and the piston bowl. In recent years CFD has been successfully established for the calculation of fluid flow, mixture formation and combustion in internal combustion engines as a complementary tool to in-cylinder pressure analysis and optical mixture formation and combustion diagnostics. The accuracy of the calculation results and hence the potential contribution of the CFD simulation to major design decisions within the engine development process strongly depends on the achievable project turnaround times and the reliability of the models adopted for the treatment of the individual in-cylinder physical and chemical processes, such as cavitating injector flow, liquid fuel spray propagation, evaporation and mixing with the in-cylinder charge, auto-ignition, turbulent combustion and pollutants formation. As the result of intense world-wide research and development efforts over the last decades, a variety of models exhibiting different levels of complexity and sophistication is available today [1][2][3][4][5][6][7][8][9][10][11].The diesel combustion process is characterized by heterogeneous mixture formation and combustion. In diesel engines, fuel is directly injected under high pressure, usually shortly before the top dead center, into the combustion chamber [5][6][7]. The fluid fuel entering t...

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“…The implementation of the model into FIRE ® and a comprehensive validation study is described by Priesching et al [24]. The main advantage of the ECFM-3Z model is that it is a universal model applicable for gasoline as well as conventional and alternative diesel combustion modes, such as HCCI (homogeneous charge compression ignition).…”

Section: Physical Modelsmentioning

confidence: 99%

Coupling of 3D Eulerian and Lagrangian Spray Approaches in Industrial Combustion Engine Simulations

Edelbauer¹

2014

JEPE

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Abstract:The Lagrangian DDM (discrete droplet model) is state-of-the-art for CFD (computational fluid dynamics) simulations of mixture formation and combustion in industrial engines. A commonly known drawback of the DDM approach is the attenuated validity in the dense spray, where the bulk liquid disintegrates into droplets. There the assumption of single droplets surrounded by a homogenous gas field is not reasonable. In this region, the Eulerian-Eulerian multi-phase approach performs better because instead of parcels the spray is represented by the volume fractions of one bulk liquid and several droplet size class phases. A further drawback of the DDM approach is that increasing the spatial resolution of the computational grid leads to a reduced statistical convergence, since the number of spray parcels per computational cell becomes smaller. It is desirable to combine the benefits of both spray approaches in coupled CFD simulations. Therefore, the dense spray region is simulated separately with the Eulerian spray approach on a highly resolved mesh covering only the region close to the nozzle orifice. The entire engine domain with combustion and emission models is simulated with the Eulerian-Lagrangian spray approach for the dilute spray region. The two simulations are coupled through exchange of boundary conditions and model source terms. An on-line coupling interface manages the data transfer between the two simulation clients, i.e., Eulerian spray and engine client. The aim of this work is to extend the coupled spray approach in terms of exchanging combustion related heat and species sources, and consequently creating the link between Eulerian spray and combustion models. The results show mixture formation and combustion in real-case engine simulations, and demonstrate the feasibility of spray model combination in engineering applications.

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3D-CFD Modeling of Conventional and Alternative Diesel Combustion and Pollutant Formation - A Validation Study

Cited by 26 publications

References 10 publications

Model of the combustion process in the marine 4-stroke diesel engine

Model of the combustion process in the marine 4-stroke diesel engine

Analysis the ECFM-3Z Combustion Model for Simulating the Combustion Process and Emission Characteristics in a HSDI Diesel Engine

Coupling of 3D Eulerian and Lagrangian Spray Approaches in Industrial Combustion Engine Simulations

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