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Large eddy simulation of premixed combustion in spark ignited engines using a dynamic flame surface density model

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posted on 29.01.2014, 09:36 by Chathura P. Ranasinghe, Weeratunge MalalasekeraWeeratunge Malalasekera, Andrew Clarke
In this work, cyclic combustion simulations of a spark ignition engine were performed using the Large Eddy Simulation techniques. The KIVA-4 RANS code was modified to incorporate the LES capability. The flame surface density approach was implemented to model the combustion process. Ignition and flame kernel models were also developed to simulate the early stage of flame propagation. A dynamic procedure was formulated where all model coefficients were locally evaluated using the resolved and test filtered flow properties during the fully developed phase of combustion. A test filtering technique was adopted to use in wall bounded systems. The developed methodology was then applied to simulate the combustion and associated unsteady effects in a spark ignition engine. The implementation was validated using the experimental data taken from the same engine. Results show that, even with relatively coarser meshes used in this work, present LES implementation has been able to resolve the evolution of a large number of in-cylinder flow structures, which are more influential for engine performance. Predicted combustion rate and pressure rise is also in good agreement with the measurements. The limits of cyclic variations are well within the experimentally observed range. It has also been able to demonstrate the limits of cyclic fluctuations to a reasonable degree even with a fewer number of simulation cycles. A significant variation of flame propagation has also been predicted by the simulations.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Citation

MALALASEKERA, W., RANASINGHE, C.P. and CLARKE, A., 2013. Large eddy simulation of premixed combustion in spark ignited engines using a dynamic flame surface density model. SAE International Journal of Engines, 6 (2), pp. 898-910.

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© SAE International

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AM (Accepted Manuscript)

Publication date

2013

Notes

This paper was presented at the SAE 2013 World Congress & Exhibition, Detroit, USA, 16-18 April 2013, and was published in the journal, SAE International Journal of Engines. Copyright © 2013 SAE International. This paper is posted on this site with permission from SAE International. It may not be shared, downloaded, duplicated, printed or transmitted in any manner, or stored on any additional repositories or retrieval system without prior written permission from SAE.

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en

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