PIV analysis of in-cylinder flow structures over a range of realistic engine speeds

Stansfield, P.; Wigley, Graham; Justham, T; Catto, Julian; Pitcher, Graham

doi:10.1007/s00348-007-0335-x

Cited by 74 publications

(20 citation statements)

References 8 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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“…The first method was based on angular momentum (TR1) while the second method was based on vorticity (TR2). TR1 was defined by the ratio of the actual angular momentum of the fluid to the total fluid mass M assuming solid body motion at crank angle speed ω while the center of rotation was taken to be the center of the field of view Stansfield et al (2007). 4ω is the angular speed of the crank shaft (rad/sec) which was estimated based on constant axial velocity across the bore in the steady port flow bench condition defined as Druault et al (2005):…”

Section: Tumble Ratiomentioning

confidence: 99%

Experimental Investigation of the In-Cylinder Tumble Motion inside GDI Cylinder at Different Planes under Steady-State Condition using Stereoscopic-PIV

El-Adawy

Heikal

Aziz

2019

JAFM

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This paper describes an experimental study aimed at the characterization of the steady-state tumble motion in the cylinder of an engine using stereoscopic particle image velocimetry (Stereo-PIV). More specifically, a pentroof four valves gasoline direct injection (GDI) engine head was mounted on a modified FEV steady-state flow rig for applying Stereo-PIV at different measurement vertical tumble planes at mid cylinder, mid injector and mid valve. The flow field was described by the distribution of the ensemble average flow patterns for 1000 pairs of images for every case, vorticity contours, turbulent kinetic energy and tumble ratio. The results revealed that the higher velocities acquired at the mid valve plane improved the turbulent kinetic energy and tumble ratio compared to the other planes. There was a good level of agreement between direct and indirect methods used for calculating the tumble ratio.

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“…Aiming to prepare an in-cylinder aerodynamics with reduced cyclic dispersions, a relevant solution of intake port geometry modification was proposed by implementing charge motion control valves far upstream of the intake valves (Floch et al 1995;Isaka and Higaki 1995;Zhongchang et al 2002;Jebamani and Kumar 2008) or air jets and flaps in the pipe near the intake valves. As described in Stansfield et al (2007) for SI engines, a tumble (a rotational fluid motion with an axis perpendicular to the cylinder axis) is generated at the intake stroke by the upper jet coming from the intake port. Meanwhile, the lower jet descends along the cylinder wall to result a recirculation zone.…”

Section: Abbreviationsmentioning

confidence: 99%

Proper orthogonal decomposition analysis for cycle-to-cycle variations of engine flow. Effect of a control device in an inlet pipe

Guibert

2012

Exp Fluids

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This paper aims to investigate cycle-to-cycle variations of non-reacting flow inside a motored singlecylinder transparent engine in order to judge the insertion amplitude of a control device able to displace linearly inside the inlet pipe. Three positions corresponding to three insertion amplitudes are implemented to modify the main aerodynamic properties from one cycle to the next. Numerous particle image velocimetry (PIV) two-dimensional velocity fields following cycle database are posttreated to discriminate specific contributions of the fluctuating flow. We performed a multiple snapshot proper orthogonal decomposition (POD) in the tumble plane of a pent roof SI engine. The analytical process consists of a triple decomposition for each instantaneous velocity field into three distinctive parts named mean part, coherent part and turbulent part. The 3rd-and 4th-centered statistical moments of the proper orthogonal decomposition (POD)-filtered velocity field as well as the probability density function of the PIV realizations proved that the POD extracts different behaviors of the flow. Especially, the cyclic variability is assumed to be contained essentially in the coherent part. Thus, the cycle-to-cycle variations of the engine flows might be provided from the corresponding POD temporal coefficients. It has been shown that the in-cylinder aerodynamic dispersions can be adapted and monitored by controlling the insertion depth of the control instrument inside the inlet pipe.

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PIV analysis of in-cylinder flow structures over a range of realistic engine speeds

Cited by 74 publications

References 8 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

Experimental Investigation of the In-Cylinder Tumble Motion inside GDI Cylinder at Different Planes under Steady-State Condition using Stereoscopic-PIV

Proper orthogonal decomposition analysis for cycle-to-cycle variations of engine flow. Effect of a control device in an inlet pipe

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