The Effect of TDC Temperature and Density on the Liquid-Phase Fuel Penetration in a D. I. Diesel Engine

Espey, Christoph; Dec, John E.

doi:10.4271/952456

Cited by 88 publications

(51 citation statements)

References 13 publications

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“…The efforts in Europe with the IDEA fuel have been the most focused in defining and evaluating a surrogate fuel for the validation of numerical simulations of diesel combustion. Numerous other experimental investigations have employed surrogate diesel fuels to match application targets for conventional diesel combustion [21][22][23][24][25]. However, none of these studies compared surrogate fuel results with those for real diesel using experimental or computational approaches that could isolate kinetic and/or physical effects.…”

Section: Legendmentioning

confidence: 99%

Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels

Farrell¹,

Cernansky²,

Dryer³

et al. 2007

SAE Technical Paper Series

328

241

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Section: Legendmentioning

confidence: 99%

Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels

Farrell¹,

Cernansky²,

Dryer³

et al. 2007

SAE Technical Paper Series

328

241

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“…Over the past decade, a wide variety of these diagnostics have been applied to directinjection (DI) diesel combustion using a specially designed, optically accessible research engine (1)(2)(3)(4)(13)(14)(15)(16)(17)(18)(19)(24)(25)(26). These laser-imaging measurements have provided an abundance of new information about the details of diesel combustion and emissions formation.…”

Section: Laser Diagnosticsmentioning

confidence: 99%

“…The optical data obtained with this engine have included the following laser-sheet imaging measurements: Mie scattering to determine liquid-phase fuel distributions (13), Rayleigh scattering for quantitative vapor-phasefuel/air mixture images and temperature fields (15), laser-induced incandescence (LII) for relative soot concentrations (2,3,24), simultaneous LII and Rayleigh scattering for relative soot particle-size distributions (17,18), planar laser-induced fluorescence (PLIF) to obtain early PAH (poly-aromatic hydrocarbon) distributions (24), PLIF images of the OH radical that show the diffusion flame structure (4), and PLIF images of the NO radical showing the onset of NOx production (25). In addition, natural-emission chemiluminescence images were obtained to investigate autoignition, and natural soot luminosity images showed initial soot development and overall jet penetration (3,18,26).…”

Section: Laser Diagnosticsmentioning

confidence: 99%

“…Government laboratories in the U.S., Europe and several universities (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) have undertaken laser imaging studies to define the structure of diesel flames and their temporal evolution. Although these diagnostics were performed on a variety of engine and high-pressure vessel configurations, they show many similarities and begin to form a basis for the general description of a burning diesel fuel spray plume.…”

mentioning

confidence: 99%

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Diesel Combustion: An Integrated View Combining Laser Diagnostics, Chemical Kinetics, And Empirical Validation

Flynn

Durrett

Hunter

et al. 1999

SAE Technical Paper Series

Self Cite

330

201

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February 1999This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may be made before publication, this preprint is made available with the understanding that it will not be cited or reproduced without the permission of the author. PREPRINTThis paper was prepared for submittal to the DISCLAIMER This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. 1999-01- Charles K. WestbrookLawrence Livermore National Laboratory ABSTRACT This paper proposes a structure for the diesel combustion process based on a combination of previously published and new results. Processes are analyzed with proven chemical kinetic models and validated with data from production-like direct injection diesel engines. The analysis provides new insight into the ignition and particulate formation processes, which combined with laser diagnostics, delineates the twostage nature of combustion in diesel engines. Data are presented to quantify events occurring during the ignition and initial combustion processes that form soot precursors.A framework is also proposed for understanding the heat release and emission formation processes.

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“…Prior to calculating the AHRR, pressure data were smoothed with a Fourier series high-frequencyreject filtering algorithm that used a Gaussian roll-off function as discussed in Ref. [25].…”

Section: Diagnosticsmentioning

confidence: 99%

Effects of diesel fuel combustion-modifier additives on In-cylinder soot formation in a heavy-duty Dl diesel engine.

Musculus

Dietz²

2005

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Based on a phenomenological model of diesel combustion and pollutant-formation processes, a number of fuel additives that could potentially reduce in-cylinder soot formation by altering combustion chemistry have been identified. These fuel additives, or "combustion modifiers," included ethanol and ethylene glycol dimethyl ether, polyethylene glycol dinitrate (a cetane improver), succinimide (a dispersant), as well as nitromethane and another nitro-compound mixture. To better understand the chemical and physical mechanisms by which these combustion modifiers may affect soot formation in diesel engines, in-cylinder soot and diffusion flame lift-off were measured, using an optically-accessible, heavy-duty, direct-injection diesel engine.A line-of-sight laser extinction diagnostic was employed to measure the relative soot concentration within the diesel jets ("jetsoot") as well as the rates of deposition of soot on the piston bowl-rim ("wall-soot"). An OH chemiluminescence imaging technique was utilized to measure the lift-off lengths of the diesel diffusion flames so that fresh oxygen entrainment rates could be compared among the fuels. Measurements were obtained at two operating conditions, using blends of a base commercial diesel fuel with various combinations of the fuel additives.The ethanol additive, at 10 % by mass, reduced jet-soot by up to 15%, and reduced wall-soot by 30-40%. The other fuel additives also affected in-cylinder soot, but unlike the ethanol blends, changes in in-cylinder soot could be attributed solely to differences in the ignition delay. No statistically-significant differences in the diesel flame lift-off lengths were observed among any of the fuel additive formulations at the operating conditions examined in this study. Accordingly, the observed differences in in-cylinder soot among the fuel formulations cannot be attributed to differences in fresh oxygen entrainment upstream of the soot-formation zones after ignition.

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The Effect of TDC Temperature and Density on the Liquid-Phase Fuel Penetration in a D. I. Diesel Engine

Cited by 88 publications

References 13 publications

Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels

Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels

Diesel Combustion: An Integrated View Combining Laser Diagnostics, Chemical Kinetics, And Empirical Validation

Effects of diesel fuel combustion-modifier additives on In-cylinder soot formation in a heavy-duty Dl diesel engine.

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