Development of a Large-Eddy Simulation Methodology for the Analysis of Cycle-to-Cycle Combustion Variability of a Lean Burn Engine

Benoit, O.; Truffin, Karine; Jay, Stéphane; Oijen, J.A. van; Drouvin, Y.; Kayashima, T.; Adomeit, Philipp; Angelberger, Christian

doi:10.1007/s10494-021-00278-7

Cited by 8 publications

(10 citation statements)

References 49 publications

(61 reference statements)

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“…Among the three available engine operating points, the one characterized by leaner mixture (k = 1.83) and having a transverse position of the spark plug is retained because it is characterized by higher level of CCV. For more details about the engine configuration the reader can refer to [4,9,12].…”

Section: Engine Configurationmentioning

confidence: 99%

“…q is the filtered density and X represents either u or b. m is the molecular kinematic viscosity and mt is the subgrid-scale kinematic viscosity estimated at the combustion filter size Á = nresD x . D x is a typical cell size and nres is set to 8 in the present study [4,7]. The source term e _ x X i takes into account the reaction rate and is computed separately for burned and unburned species.…”

Section: Physical and Les Numerical Modelsmentioning

confidence: 99%

“…is proposed, N ¼ Àrc= jrcj being the local vector normal to the iso-surfaces of the progress variable. The corresponding transport equation is detailed in [4,7,17].…”

Section: Physical and Les Numerical Modelsmentioning

confidence: 99%

“…These are supposed to be related to the interaction between the turbulent structures and the flame kernel in the early stages of the combustion process, e.g. right after the onset of ignition [4]. For this purpose the use of high-fidelity Computational Fluid Dynamics (CFD) tools can help understand the interactions between the various physical phenomena at stake and to make relevant design choices.…”

Section: Introductionmentioning

confidence: 99%

“…For this engine, experimental data are available in cold gas-exchange conditions and for the reactive configuration with only slight differences in the geometry between cold and hot configurations. Some modelling work for these ultra-lean mixtures conditions has already been proposed in [4] and will be used as a basis for the present study which aims to go another step further into the combustion cyclic variability analysis with postprocessing tools dedicated to complex turbulent reactive flows. After presenting the numerical modeling and setup, the results of the study are organised as follows:…”

Section: Introductionmentioning

confidence: 99%

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ECFM-LES modeling with AMR for the CCV prediction and analysis in lean-burn engines

Maio

Ding

Truffin

et al. 2022

Sci. Tech. Energ. Transition

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A Large-Eddy Simulation (LES) modeling framework, dedicated to ultra-lean spark-ignition engines, is proposed and validated in the present work. A direct injection research engine is retained as benchmark configuration. The LES model is initially validated using the cold gas-exchange conditions by comparing numerical results with PIV (Particle Imaging Velocimetry) experimental data. Then, the fired configuration is investigated, combining ECFM (Extended Coherent Flame Model) turbulent combustion model with Adaptive Mesh Refinement (AMR). The capability of the model to reproduce experimental pressure envelope and cycle-to-cycle variability is assessed. Within the major scope of the work, a particular focus on the Combustion Cyclic Variability (CCV) is made correlating them with the variability encountered in the in-cylinder aerodynamic variations. R3P4. Finally two post-processing tools, Empirical Mode Decomposition (EMD) and Γ3p function, are proposed and combined to analyse for the first time the aerodynamic tumble-based in-cylinder velocity field. Both tools make it possible to get deeply into the insight and visualization of the flow field and to understand the links between its cyclic variability and the combustion cyclic variability.

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Section: Engine Configurationmentioning

confidence: 99%

Section: Physical and Les Numerical Modelsmentioning

confidence: 99%

“…is proposed, N ¼ Àrc= jrcj being the local vector normal to the iso-surfaces of the progress variable. The corresponding transport equation is detailed in [4,7,17].…”

Section: Physical and Les Numerical Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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