Implementation of a Single Zone k-ε Turbulence Model in a Multi Zone Combustion Model

Sjerić, Momir; Kozarac, Darko; Bogensperger, Michael

doi:10.4271/2012-01-0130

Cited by 18 publications

(16 citation statements)

References 16 publications

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“…Part load and full load cases for low and high engine speeds were analyzed. Different ge- [11] ometries of the combustion chamber are defined by the specification of chamber geometry parameters such as bore, stroke, height of the combustion head, angles of the pentroof shape, ridge eccentricity, etc. 3.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…The previously defined single zone model [11] is able to calculate the mean turbulence kinetic energy of the cylinder mixture well. This fact was exploited in the development of the two zone model.…”

Section: Single Zone K-e Turbulence Modelmentioning

confidence: 99%

“…This paper presents the continuation of the previous work where a single zone k-e turbulence model and its implementation in cycle-simulation software (AVL Boost) are made [11]. The single zone turbulence model presented in [11] is extended to a two zone turbulence model.…”

Section: Introductionmentioning

confidence: 99%

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Development of a two zone turbulence model and its application to the cycle-simulation

2014

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The development of a two zone k-e turbulence model for the cycle-simulation software is presented. The in-cylinder turbulent flow field of internal combustion engines plays the most important role in the combustion process. Turbulence has a strong influence on the combustion process because the convective deformation of the flame front as well as the additional transfer of the momentum, heat, and mass can occur. The development and use of numerical simulation models are prompted by the high experimental costs, lack of measurement equipment and increase in computer power. In the cycle-simulation codes, multi zone models are often used for rapid and robust evaluation of key engine parameters. The extension of the single zone turbulence model to the two zone model is presented and described. Turbulence analysis was focused only on the high pressure cycle according to the assumption of the homogeneous and isotropic turbulent flow field. Specific modifications of differential equation derivatives were made in both cases (single and two zone). Validation was performed on two engine geometries for different engine speeds and loads. Results of the cycle-simulation model for the turbulent kinetic energy and the combustion progress variable are compared with the results of 3-D computational fluid dynamics simulations. Very good agreement between the turbulent kinetic energy during the high pressure cycle and the combustion progress variable was obtained. The two zone k-e turbulence model showed a further progress in terms of prediction of the combustion process by using only the turbulent quantities of the unburned zone.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

Section: Single Zone K-e Turbulence Modelmentioning

confidence: 99%

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Development of a two zone turbulence model and its application to the cycle-simulation

2014

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“…In this study, the cyclic variability of combustion in SI engines is produced by a predefined perturbation of the turbulence intake production parameter, by a perturbation of the flow direction at the spark plug and by a perturbation of the stratification of air equivalence ratio from cycle-to-cycle, simulating the fluctuations of in-cylinder turbulence level, fluid motion and stratification of fuel, respectively. Since the combustion and turbulence models have already been described in previous publications [26,27], the description of the numerical model in this paper will be limited to the quasi-dimensional ignition model and to the methodology of inducing CCV in the simulations.…”

Section: Introductionmentioning

confidence: 99%

“…For the study specific modifications and extensions of the available fractal combustion model are made. For the modelling of in-cylinder turbulence a new turbulence model is implemented [26,27], while the combustion process is simulated by the modified fractal model that includes an ignition sub-model, a sub-model for transition from laminar to turbulent flame and a two zone turbulence sub-model. The early flame kernel growth is modelled by a newly [28] commonly used in 3D-CFD simulations.…”

Section: Introductionmentioning

confidence: 99%

Modelling of early flame kernel growth towards a better understanding of cyclic combustion variability in SI engines

Sjerić

Kozarac

Tatschl

2015

Energy Conversion and Management

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Cycle-simulation turbulence modelling of IC engines

Sjerić

Kozarac

Ormuž

2016

Int.J Automot. Technol.

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Numerical simulations of IC engines are of high interest for automotive engineers worldwide. The simulation models should be as fast as possible, low-computational effort and predictive tool. The correct prediction of turbulence level inside the combustion chamber of spark ignition engines is the most important factor influencing to the engine working cycle. This paper presents a development of the k-ε turbulence model applied to the commercial cycle-simulation software with the high emphasis on the intake part. The validation was performed on two engine geometries with the variation of engine speed and load comparing the cycle-simulation results of the turbulent kinetic energy and in-cylinder temperature with 3-D CFD results. In order to apply the cycle-simulation turbulence model for the simulation of entire engine map, the parameterization model of turbulence constants was proposed. The parameterized turbulence model was optimized using NLPQL optimization algorithm where the single set of turbulence model parameters for each engine was found. A good agreement of the turbulent kinetic energy during the expansion was achieved when the turbulence affects the flame front propagation and combustion rate as well.

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Implementation of a Single Zone k-ε Turbulence Model in a Multi Zone Combustion Model

Cited by 18 publications

References 16 publications

Development of a two zone turbulence model and its application to the cycle-simulation

Development of a two zone turbulence model and its application to the cycle-simulation

Modelling of early flame kernel growth towards a better understanding of cyclic combustion variability in SI engines

Cycle-simulation turbulence modelling of IC engines

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