EGR and Swirl Distribution Analysis Using Coupled 1D-3D CFD Simulation for a Turbocharged Heavy Duty Diesel Engine

Ramanathan, S.; Hudson, Anthony; Styron, Joshua; Baldwin, Brian; Ives, D.; Ducu, Dan

doi:10.4271/2011-01-2222

Cited by 8 publications

(5 citation statements)

References 2 publications

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“…The EGR inlet boundary is placed several diameters upstream the EGR valve, while the fresh air inlet is placed upstream the throttle valve. The geometry of this six cylinder manifold is different to the ones described in other works, in which the air and EGR streams are directly mixed in the manifold 22,23 or the cylinders are not equally spaced. 24 The mixer studied in this work (see bottom side of Figure 3) can be included in the geometries that mix the air and EGR streams in a T-Junction upstream the manifold, like the manifolds that appear in Luján et al 12 and Hariganesh et al, 25 but these engines have four cylinders.…”

Section: Methodsmentioning

confidence: 96%

“…On the other hand, in 3D RANS coupled with engine simulation software, the number of cycles calculated previously to the coupling are about 10 to 15 cycles. 22,31 Taking into account the achieved results, the number of cycles to make a proper average in this work are about 7 to 11, depending of the considered operating point.…”

Section: Methodsmentioning

confidence: 98%

“…In EGR dispersion problems, Galindo et al 40 discuss the possibility of performing 1D-3D co-simulations by coupling the engine model with the 3D CFD model of the intake manifold, to get a perfect agreement in the boundary conditions of the domain. 22,31 However, this type of “strong coupling” entails an increase of computational effort, together with other constraints. 40 In this work, the calibrated engine simulation results have been imposed to the 3D models as boundary conditions only in a 1-way direction.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Assessment of the numerical and experimental methodology to predict EGR cylinder-to-cylinder dispersion and pollutant emissions

Galindo

Climent

Garcia

et al. 2020

International Journal of Engine Research

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EGR cylinder-to-cylinder dispersion poses an important issue for piston engines, since it increases NOx and particulate matter (PM) emissions. In this work, the EGR distribution on a 6-cylinder intake manifold is analyzed by means of experiments, 0D/1D engine modeling and 3D CFD simulations at three different working points. Using a comprehensive set of measurements, statistical regressions for NOx and PM emissions are developed and employed to quantify the sensitivity of numerical configuration to EGR dispersion and subsequent increase of pollutants. CFD mesh and time-step size independence studies are conducted, taking into account their interrelation through the Courant number. The obtained numerical configuration is validated against experimental measurements, considering different unsteady RANS turbulence submodels ([Formula: see text] and [Formula: see text]) as well as the inviscid case. The agreement of the different approaches is quite sensitive to the operating conditions, obtaining root mean square errors for the average cylinder-to-cylinder EGR distribution between 1% and 17% and for the transient [Formula: see text] traces between 8% and 29%. However, for the worst-case scenario, the error in NOx and PM emissions prediction is below 2%. The regressions are employed to find a greater EGR distribution impact on pollutants when EGR rate or dispersion are increased. Flow investigation reveals the underlying reasons for the discrepancies and similarities between the predictions of the different turbulence submodels. A statistical analysis shows the significant errors that average [Formula: see text] probes make when assessing EGR cylinder-to-cylinder distribution, which is explain by the flow heterogeneity at some operating conditions.

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Section: Methodsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of the numerical and experimental methodology to predict EGR cylinder-to-cylinder dispersion and pollutant emissions

Galindo

Climent

Garcia

et al. 2020

International Journal of Engine Research

View full text Add to dashboard Cite

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“…To this purpose, several investigative tools, based on computational fluid dynamics (CFD) codes or experimental approaches [13][14][15][16][17], are available to examine in detail the fluid dynamic behaviour of real engines. To this purpose, several investigative tools, based on computational fluid dynamics (CFD) codes or experimental approaches [13][14][15][16][17], are available to examine in detail the fluid dynamic behaviour of real engines.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the fluid dynamic efficiency of a high performance multi-valve internal combustion engine during the intake phase: Influence of valve-valve interference phenomena

Algieri¹

2013

THERM SCI

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The purpose of the present work is the analysis of the fluid dynamic behavior of a high performance internal combustion engine during the intake phase. In particular, a four-valve spark-ignition engine has been characterized at the steady flow rig. Dimensionless discharge coefficients have been used to define the global fluid dynamic efficiency of the intake system, while the Laser Doppler Anemometry (LDA) technique has been employed to evaluate the mean flow in the valve curtain area and to characterise the interference phenomena between the two intake valves. The investigation has shown the significant influence of the valve lift on the volumetric efficiency of the intake apparatus. Moreover, the experimental analysis has highlighted that the valve-valve interference phenomena have a relevant impact on the head breathability, on the flow development within the combustion chamber and on the velocity standard deviations

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“…The analysis showed up to 11% reduction in brake specific fuel consumption at 2000 rpm and a significant improvement in fuel economy and combustion stability with respect to the base engine for loads lower than 6 bar. Several research tools, based on CFD codes and/or experimental approaches, are available to examine in detail the fluid dynamic behaviour of real engines [23][24][25][26]. Specifically, the steady flow rig is a widely employed apparatus, owing to the proper characterisation of the real phases and the possibility of analysing real engines and components [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of the fluid dynamic efficiency of standard and alternative intake strategies for multivalve spark-ignition engines

Algieri

2013

IJET

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The work aims at investigating the fluid dynamic performances of a multivalve spark-ignition engine and at evaluating the influence of the throttling process on the engine permeability. To this purpose, a production four-stroke internal combustion engine is analysed during the intake phase. The experimental characterisation is carried out at the steady flow rig in terms of dimensionless discharge and flow coefficients. The global investigation illustrates the noticeable effect of the valve lift on the engine head breathability. Furthermore, the experimental analysis demonstrates that the throttling process has a significant influence on the volumetric efficiency of the intake system and this effect increases with the valve lift. Finally, alternative strategies are studied in order to improve the engine fluid dynamic efficiency at partial loads. Specifically, the research shows that inlet valve deactivation and the adoption of asymmetric intake valve lifts assure an increase in head permeability.

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EGR and Swirl Distribution Analysis Using Coupled 1D-3D CFD Simulation for a Turbocharged Heavy Duty Diesel Engine

Cited by 8 publications

References 2 publications

Assessment of the numerical and experimental methodology to predict EGR cylinder-to-cylinder dispersion and pollutant emissions

Assessment of the numerical and experimental methodology to predict EGR cylinder-to-cylinder dispersion and pollutant emissions

Experimental investigation of the fluid dynamic efficiency of a high performance multi-valve internal combustion engine during the intake phase: Influence of valve-valve interference phenomena

Comparative analysis of the fluid dynamic efficiency of standard and alternative intake strategies for multivalve spark-ignition engines

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