A Computational Investigation of the Effects of Swirl Ratio and Injection Pressure on Mixture Preparation and Wall Heat Transfer in a Light-Duty Diesel Engine

Perini, Federico; Dempsey, Adam B.; Reitz, Rolf D.; Sahoo, Dipankar; Petersen, Benjamin; Miles, Paul C.

doi:10.4271/2013-01-1105

Cited by 39 publications

(24 citation statements)

References 22 publications

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“…Widely adopted sector mesh engine simulations have not been able to capture local mixture preparation and jet-to-jet differences that are responsible for most of UHC and CO emissions [5,17], even when excellently reproducing the overall in-cylinder ignition behavior. For this reason, the focus of the present study was a thorough description of the engine fluid flow properties, using a comprehensive computational model of the experimental engine facility.…”

Section: Induced Fluorescence (Plif) Based Experimental Technique Wasmentioning

confidence: 99%

“…High-speed, direct-injection Diesel engines (HSDI) are particularly suit-able for applying low-load, partially premixed combustion strategies, due to their swirl-tailored-intake-duct designs that allow high swirl ratios to be achieved within the combustion chamber, fostering fuel-air mixing before ignition of the richest regions occurs [4,5]. The light-duty optical diesel engine facility at the Sandia National Laboratories (SNL) has provided significant insight into the mechanisms that rule the sources of UHC and CO emissions arising from low-load PPC combustion [3][4][5][6][7][8][9][10][11][12][13]. In the studies, a Planar Laser…”

Section: Introductionmentioning

confidence: 99%

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A comprehensive modeling study of in-cylinder fluid flows in a high-swirl, light-duty optical diesel engine

2014

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The effectiveness of computational fluid dynamics modeling as a tool for researching fuel-lean, low temperature engine combustion strategies relies on its capability to capture the local fluid flow properties that affect spray dynamics, mixture preparation and ignition kinetics. In this study, a comprehensive model of an optically accessible, single-cylinder light-duty diesel engine was developed for engine combustion research. The computational model

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Section: Induced Fluorescence (Plif) Based Experimental Technique Wasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A comprehensive modeling study of in-cylinder fluid flows in a high-swirl, light-duty optical diesel engine

2014

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“…A full engine computational model based on the KIVA code [35] was developed to reproduce the experimental results, and to explore flow structures where experimental measurements featured excessive distortion from the bowl-shaped optical piston assembly.…”

Section: Computational Modelmentioning

confidence: 99%

“…Solver. The simulations were performed using the KIVA [35] Reynolds-Averaged Navier-Stokes (RANS) solver which allowed comparisons with the ensemble-averaged measurements.…”

Section: H Tmentioning

confidence: 99%

“…As Figure 12 shows, significant deviations can be also observed in terms of the planar swirl ratio, Rs z . The planar swirl ratio was evaluated using the same definition as the global swirl ratio, where for each point on the plane, a mass corresponding to the mass of the momentum control volume corresponding to that same point [35] was used:…”

Section: Global Swirl Vortex Structurementioning

confidence: 99%

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Principal Component Analysis and Study of Port-Induced Swirl Structures in a Light-Duty Optical Diesel Engine

Perini¹,

Zha

Busch

et al. 2015

SAE Technical Paper Series

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In this work computational and experimental approaches are combined to characterize in-cylinder flow structures and local flow field properties during operation of the Sandia 1.9L light-duty optical Diesel engine. A full computational model of the single-cylinder research engine was used that considers the complete intake and exhaust runners and plenums, as well as the adjustable throttling devices used in the experiments to obtain different swirl ratios. The in-cylinder flow predictions were validated against an extensive set of planar PIV measurements at different vertical locations in the combustion chamber for different swirl ratio configurations. Principal Component Analysis was used to characterize precession, tilting and eccentricity, and regional averages of the in-cylinder turbulence properties in the squish region and the piston bowl. Complete sweeps of the port throttle configurations were run to study their effects on the flow structure, together with their correlation with the swirl ratio. Significant deviations between the flows in the piston bowl and squish regions were observed. Piston bowl design, more than the swirl ratio, was identified to foster flow homogeneity between these two regions. Also, analysis of the port-induced flow showed that port geometry, more than different intake port mass flow ratios, can improve turbulence levels in-cylinder.

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Numerical Simulation and Emissions Performance of a Gasoline Compression Ignition Engine at High Idle and Low-Load Conditions

Krishnamoorthi,

Agarwal

2023

Mechanisms and Machine Science

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A Computational Investigation of the Effects of Swirl Ratio and Injection Pressure on Mixture Preparation and Wall Heat Transfer in a Light-Duty Diesel Engine

Cited by 39 publications

References 22 publications

A comprehensive modeling study of in-cylinder fluid flows in a high-swirl, light-duty optical diesel engine

A comprehensive modeling study of in-cylinder fluid flows in a high-swirl, light-duty optical diesel engine

Principal Component Analysis and Study of Port-Induced Swirl Structures in a Light-Duty Optical Diesel Engine

Numerical Simulation and Emissions Performance of a Gasoline Compression Ignition Engine at High Idle and Low-Load Conditions

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