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Phenomenology and Modelling of Flame-Wall-Interactions in Spark-Ignition-Engines

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Phenomenology and Modelling of Flame-Wall-Interactions in Spark-Ignition-Engines (English shop)

Dominik Suckart (Author)


Extract, PDF (600 KB)
Table of Contents, PDF (510 KB)

ISBN-13 (Hard Copy) 9783736999244
ISBN-13 (eBook) 9783736989245
Language English
Page Number 178
Lamination of Cover glossy
Edition 1.
Publication Place Göttingen
Place of Dissertation Graz
Publication Date 2019-01-03
General Categorization Dissertation
Departments Technical mechanics
Keywords reciprocating engines, physical models, combustion,Governing Equations,Turbulence modelling,Scales of turbulent motion,Reynolds-Averaged,Laminar premixed flames,Turbulent,Head on quenching,Side wall quenching, Flame wall interaction,Engine test bench,Experimental procedure,Analysis of ensemble averaged,Simulative methodology,Quenching distance,Remarks and limitations,The G-equation model,The level set approach,Transport equation for mean flame,Correlations for the turbulent diffusivity,Spark ignition modelling

The optimization of combustion in reciprocating engines necessitates an in-depth understanding of the underlying processes as well as accurate and comprehensive physical models. In this respect, the current knowledge on the last stage of combustion in which the flame interacts with the combustion chamber walls is limited. Hence, the objective of this book is to improve the understanding of flame-wall interaction and its modelling. Using a comprehensive analysis of the existing literature on flame-wall interactions as a starting point, the quenching process in a direct-injection spark-ignition engine is investigated via a combination of highly resolved wall heat flux measurements and extensive numerical simulations in order to gain insight into the underlying physical processes. Building on the results, a consistent modelling approach is systematically derived based on the physics of flame quenching and post-flame oxidation. The resulting flame-wall interaction model is based on the G-equation combustion model and incorporates the effects of flame quenching and near-wall turbulence. Finally, the model is applied to simulate combustion in a turbulent channel flow as well as in spark-ignition engines. The results are highlighting the importance of flame-wall interactions for premixed combustion processes in engines and their prediction via simulation.