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• W2912283526 abstract "The motivation for this thesis is the development of a simulation tool that can deliver spatially- and time-resolved information to better understand the highly unsteady and irregular flow motion and combustion inside spark ignition engines. The key element of the method is that the large eddies are directly solved on the computational grid and the smaller structures are modelled, i.e. large eddy simulation (LES). High order numerical schemes for an accurate solution are applied, which are still not state-of-the-art for most of the industrially relevant problems. The simulation tool is integrated into an existing open source software and is successfully validated against Particle Image Velocimetry (PIV) and Magnetic Resonance Velocimetry (MRV) measurements of optically accessible research engines. A generic simulation workflow based on a mapping-strategy is proposed with a mesh-morphing strategy without topological changes in-between the mapping intervals. The simulation workflow includes an automated grid generation for complex engine geometries with inclined valves and the piston top-land crevice. It is applied to three different engine geometries.A criterion is established for estimating the number of cycles needed in a simulation, if experimental data is available. A visualization strategy is developed and an analysis for the tumble flow based on auto-correlation coefficients is proposed, which allows quantify- ing the tumble break-down process. The tumble visualization and quantification methods are used to study the sensitivity of the turbulent flow field based on cold-flow multi-cycle simulations of two different cylinder-head geometries.In a next step, the flow fields of the two different cylinder-head geometries are taken to study the flame propagation by a flame-surface-density modelling approach with different algebraic expressions for the flame wrinkling. Furthermore, fired multi-cycle simulations with internal exhaust gas recirculation are carried out and compared to Mie-scattering images of the flame propagation of the corresponding engine. Finally, undesirable combustion phenomena are studied, like the flame propagation into the piston top-land crevice, which is known as a source for unburnt hydrocarbons.The developed tool opens the door for high resolution simulations of internal combustion engines." @default.
• W2912283526 created "2019-02-21" @default.
• W2912283526 creator A5088454617 @default.
• W2912283526 date "2017-09-12" @default.
• W2912283526 modified "2023-09-26" @default.
• W2912283526 title "Large eddy simulation of in-cylinder phenomena in spark ignition engines" @default.
• W2912283526 hasPublicationYear "2017" @default.
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