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Sensitivity of Flamelet Combustion Model to Flame Curvature for IC Engine Application
Technical Paper
2017-24-0038
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Engines with reduced emissions and improved efficiency are of high interest for road transport. However, achieving these two goals is challenging and various concepts such as PFI/DI/HCCI/PCCI are explored by engine manufacturers. The computational fluid dynamics is becoming an integral part of modern engine development programme because this method provides access to in-cylinder flow and thermo-chemical processes to develop a closer understanding to tailor tumble and swirling motions to construct green engines. The combustion modelling, its accuracy and robustness play a vital role in this. Out of many modelling methods proposed in the past flamelet based methods are quite attractive for SI engine application. In this study, FlaRe (Flamelets revised for physical consistencies) approach is used to simulate premixed combustion inside a gasoline PFI single-cylinder, four-stroke SI engine. This approach includes a parameter representing the effects of flame curvature on the burning rate. Since the reactant temperature and pressure inside the cylinder are continually varying with time, the mutual influence of flame curvature and thermo-chemical activities may be stronger in IC engines and thus this parameter may not be constant. The sensitivity of engine simulation results to this parameter is investigated for a range of engine speed and load conditions. The results indicate some sensitivity and so a careful calibration may be required for URANS calculation which can be avoided using dynamic evaluations for LES.
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Ghiasi, G., Ahmed, I., Wright, Y., Koch, J. et al., "Sensitivity of Flamelet Combustion Model to Flame Curvature for IC Engine Application," SAE Technical Paper 2017-24-0038, 2017, https://doi.org/10.4271/2017-24-0038.Data Sets - Support Documents
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