Implementation of a single zone k-ε turbulence model in a multi zone combustion model

Sjerić, Momir and Kozarac, Darko and Bogensperger, Michael (2012) Implementation of a single zone k-ε turbulence model in a multi zone combustion model. = Implementation of a single zone k-ε turbulence model in a multi zone combustion model. In: SAE 2012 World Congress and Exhibition, 24-26.04.2012., Detroit, MI; United States.

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Research into internal combustion engines requires the development of engine simulation models which should ensure acceptable results of engine performances over a wide range of engine speeds and loads. Due to high costs of experiments and a rapid increase in the computer power, researches all over the world devote great effort to the development and improvement of simulation models. Well-known multi dimensional simulation models (CFD models) of the engine cycle are the most demanding models in terms of computational resources. On the other hand, there are multi zone models that are very robust and that are able to capture a certain in-cylinder property during the engine operating cycle. It is known that turbulence effects inside engine cylinder play an important role in the combustion process. In order to properly predict combustion process, characteristics of the turbulent flow field should also be accurately defined. The single zone k-ε turbulence model for 0D applications proposed in the literature is based on a simplified approach. A complete derivation of 0D differential equations from multi dimensional equations is presented. The defined single zone k-ε turbulence model was implemented in the cycle-simulation software. The purpose of this implementation is to obtain results of the turbulent kinetic energy in the 0D model that correlate with the results of the 3D-CFD simulations. This turbulence analysis was concentrated only on the high pressure cycle (compression and expansion). By means of a specific modification of the differential equations the implemented single zone turbulence model is able to capture the evolution of the turbulent kinetic energy very close to the 3D-CFD results. The calculation of the combustion process was carried out by a fractal combustion model which is available in the cycle-simulation software. The implementation of the single zone k-ε turbulence model shows significant improvements, both in terms of the prediction of the turbulent kinetic energy and the combustion process as one of the main parts of the engine cycle. Copyright © 2012 SAE International.

Item Type: Conference or Workshop Item (Lecture)
Keywords (Croatian): CFD models; CFD simulations; Combustion model; Combustion pro-cess; Computational resources; Computer power; Engine performance; Engine simulation models; Engine speed; High costs; High pressure; Multi dimensional; Multi-zone combustion model; Multi-zone models; Multidimensional simulation; Operating cycle; Turbulence effect; Turbulent kinetic energy; Combustion; Computational fluid dynamics; Computer software; Differential equations; Engine cylinders; Exhibitions; Kinetic energy; Kinetics; Machine design; Photolithography; Turbulence models; Three dimensional
Divisions: 400 Department of IC Engines and Mechanical Handling Equipment > 410 Chair of IC Engines and Motor Vehicles
Indexed in Web of Science: No
Indexed in Current Contents: No
Date Deposited: 29 Apr 2015 12:21
Last Modified: 02 Mar 2017 16:53

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