A comprehensive Lagrangian flame–kernel model to predict ignition in SI engines
| Autor: | Tommaso Lucchini, Gianluca D'Errico, Gianluca Montenegro, Luca Cornolti |
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| Rok vydání: | 2013 |
| Předmět: |
Turbulence
Applied Mathematics flame surface density Computer Science Applications1707 Computer Vision and Pattern Recognition Mechanics Flame speed spark channel restrike Computer Science Applications law.invention Physics::Fluid Dynamics Ignition system Computational Theory and Mathematics law Electrical network Kernel (statistics) Heat transfer Spark (mathematics) spark-ignition model CFD spark model Mean flow Physics::Chemical Physics Simulation Mathematics |
| Zdroj: | International Journal of Computer Mathematics. 91:157-174 |
| ISSN: | 1029-0265 0020-7160 |
| DOI: | 10.1080/00207160.2013.829213 |
| Popis: | A Lagrangian model to predict the first stages of the combustion process in SI engines, when the size of flame kernel is small compared with the mesh size, and flame development is influenced by heat transfer from the spark, local flow, turbulence and air/fuel mixture distribution is presented. The spark channel is initially represented by a set of Lagrangian particles that are convected by the mean flow. Flame kernels are launched locally for all the particles satisfying an ignition criterion based on the local Karlovitz number. For each of them, equations of energy and mass are solved accounting for electrical power transferred from the electrical circuit, local turbulence and flame speed. The proposed model has been validated with experimental data provided by Herweg et al.; a computational mesh reproducing the geometrical details of the optical, pre-chamber SI engine was built, including the electrodes. Initially, cold-flow simulations were carried out to verify the validity of the computed flow-field... |
| Databáze: | OpenAIRE |
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