A Numerical and Experimental Investigation of a DISI-Engine Intake Port Generated Turbulent Flow

Imberdis, O.; Hartmann, Michael; Bensler, Henry; Kapitza, L.; Thévenin, Dominique

doi:10.4271/2007-01-4047

Cited by 11 publications

(3 citation statements)

References 10 publications

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“…On the one hand, steady-state experiments on flow benches were performed to investigate the flow physics in a simplified configuration [3]; on the other hand, optically accessible engines were used for measurements with more realistic boundary conditions [4]. A small number of studies investigate the flow field in or near the valve gap in detail.…”

Section: Introductionmentioning

confidence: 99%

Spatially Resolved Experimental and Numerical Investigation of the Flow through the Intake Port of an Internal Combustion Engine

Hartmann

Buhl

Gleiss

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-Modern spark-ignited internal combustion engines have intake ports designed to introduce high levels of so-called "tumble" charge motion. Correspondingly high shear rates can lead to high fluctuations and turbulence within the combustion chamber. A suitable test case to characterize the intake flow is a steady-state flow bench. Although routinely used in the engine development process to determine the global discharge coefficients, only a few detailed numerical and experimental studies use this test case to analyze the flow in the vicinity of the valve with high spatial and temporal resolution. In this paper, we combined highly resolved two-dimensional, two-component Particle Image Velocimetry (PIV) measurements and numerical simulations using a Detached-Eddy Simulation (DES) model to characterize engine-relevant flow features on a flow bench. The spatial resolution of numerical simulations on two different grids is assessed and compared to that of the PIV measurement. The results of simulations and experiment are then compared in terms of their mean and fluctuation velocity fields and the jet orientation. A detailed study of the area around the valve seats investigates the validity of wall functions in this region. Finally, we examine structures induced by vortex-shedding at the valve stem and if they are transported into the combustion chamber.Résumé -Étude numérique et expérimentale résolue dans l'espace de l'écoulement à travers le conduit d'admission d'un moteur à combustion interne -Les moteurs à combustion interne modernes à allumage commandé disposent de conduits d'admission conçus pour générer des niveaux importants de mouvements de charge dits « tumble ». Les niveaux importants de taux de cisaillement qui en résultent peuvent conduire à de fortes fluctuations et turbulences dans la chambre de combustion. Un cas test adapté pour caractériser l'écoulement d'admission est un banc volute. Bien que son utilisation durant les phases de conception moteur pour déterminer les coefficients de perte de charge globaux soit très répandue, seules quelques études numériques et expérimentales détaillées utilisent ce test pour étudier l'écoulement au voisinage de la soupape avec des résolutions spatiales et temporelles élevées. Dans le présent article, nous avons combiné des mesures PIV bi-composants, bidimensionnelles hautement résolues et des simulations numériques utilisant une approche de type « Detached-Eddy Simulation » pour caractériser des structures d'écoulement d'importance pour le moteur sur un banc volute. La résolution spatiale des simulations numériques est évaluée sur deux maillages et comparée à celle de la mesure « Particle Image Velocimetry », PIV. Les résultats numériques et expérimentaux sont ensuite comparés en termes de champ de vitesse moyen et

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Section: Introductionmentioning

confidence: 99%

Spatially Resolved Experimental and Numerical Investigation of the Flow through the Intake Port of an Internal Combustion Engine

Hartmann

Buhl

Gleiss

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…In some cases a characteristic feature of the flow field may provide the most appropriate metric for comparison of velocity fields from PIV, large eddy simulations (LES) or Reynolds averaged Navier Stokes (RANS) modelling. The speed of the flow along the central axis of the intake port (Pera and Angelberger 2011), or the axis of the intake jet (Ameen et al 2017) can be suitable choices, as can the location of vortex centres (Imberdis et al 2007;Yang et al 2014) or spatially averaged tumble ratio (Krishna et al 2013;Koch et al 2014). As well as mean velocities, for LES simulations with many realisations, RMS velocities along selected vertical and horizontal planes have been used to compare the effect of mesh refinement on the simulation of an optical engine (Baumann et al 2014).…”

Section: Methods For Comparing Vector Fieldsmentioning

confidence: 99%

Quantitative metrics for comparison of in-cylinder velocity fields using particle image velocimetry

et al. 2020

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The in-cylinder flow field plays a key role in determining the combustion performance of internal combustion engines (ICEs) and it is critically important to validate numerical simulations of the flow field by comparison to experimental measurements using techniques such as particle image velocimetry (PIV). With the current trend for high-speed diagnostics, methods for quantitative comparison of vector fields are required which can provide robust spatially averaged results, without inspection of individual flow fields. The quality of match between vector fields, when quantified using current metrics such as the relevance index (RI), can be overly sensitive to the alignment of regions of low velocity such as the tumble vortex centre. This work presents complementary metrics, weighted using a function of the local velocity, for robust quantification of the alignment and magnitude differences between vector fields, the weighted relevance index (WRI) and the weighted magnitude index (WMI). These metrics are also normalized and combined in the combined magnitude and relevance index (CMRI). PIV measurements taken up to every 2 crank angle degrees within the tumble plane of a motored, optically accessible ICE are used to demonstrate the motivation for development and the application of the WRI, WMI, and CMRI metrics. The metrics are used to determine the number of cycles required to provide a representative mean flow field and to identify single cycles of interest. Variability of the flow field is quantified using the metrics and shows high variability in the region of the spark plug near typical ignition timings.

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“…flow separation at the inlet valves, see Figure 1) and non-linearity effects of the Navier–Stokes equation. Preliminary work showed that this model operates in scale-resolving mode in IC engine simulations (see Imberdis et al, 17 Theile et al, 3,18 and Buhl et al 19,20 ).…”

Section: Mathematical Modelsmentioning

confidence: 99%

Numerical analysis of the influence of early fuel injection on charge motion in a direct injection spark ignition engine using scale-resolving simulations

Theile

Reißig

Hassel

et al. 2019

International Journal of Engine Research

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This work summarizes the numerical analysis of the effect of early fuel injection on the charge motion in a direct injection spark ignition engine concerning cyclic fluctuations of the flow field. The combination of the scale-resolving turbulence model “Scale Adaptive Simulation” and post-processing routines for vortex trajectory visualization allows for a detailed insight into the temporal resolved and cycle-dependent behavior of the charge motion. In the first part, a simplified engine set-up is presented and used as a validation case to ensure correct behavior of the turbulence model and post-processing routines. In the second part, the computational fluid dynamics model of the real engine is introduced. The application of the proposed vortex tracking algorithm is shown, and a short discussion about the transient behavior of the charge motion in this engine set-up is given. The third part describes the analysis of the influence of the fuel injection on the charge motion at different engine speeds from 1000 to 3000 r/min and variations of the intake pressure from 1 to 2 bar. Finally, the impact on different flow field properties at possible ignition timings is discussed. Changes in mean flow field quantities as well as in aerodynamic fluctuations are found as a consequence of fuel injection.

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A Numerical and Experimental Investigation of a DISI-Engine Intake Port Generated Turbulent Flow

Cited by 11 publications

References 10 publications

Spatially Resolved Experimental and Numerical Investigation of the Flow through the Intake Port of an Internal Combustion Engine

Spatially Resolved Experimental and Numerical Investigation of the Flow through the Intake Port of an Internal Combustion Engine

Quantitative metrics for comparison of in-cylinder velocity fields using particle image velocimetry

Numerical analysis of the influence of early fuel injection on charge motion in a direct injection spark ignition engine using scale-resolving simulations

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