An Experimental Determination of the Instantaneous Potential Radiant Heat Transfer Within an Operating Diesel Engine

Flynn, P. F.; Mizusawa, Masatake; Uyehara, O. A.; Myers, P. S.

doi:10.4271/720022

Cited by 81 publications

(15 citation statements)

References 16 publications

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“…Laser diagnostics indicate that precursors originally form small particulates and as they travel down the plume they agglomerate and react to form the larger particulates of the kind emitted from the engine's tail pipe. A variety of experiments also show that these particulates are completely consumed by the hot diffusion flame sheath while high heat release rates persist (51). Diesel soot emissions appear to be the result of quenching this final phase of oxidation.…”

Section: Particulate Formationmentioning

confidence: 97%

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

Flynn

Durrett

Hunter

et al. 1999

SAE Technical Paper Series

323

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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Section: Particulate Formationmentioning

confidence: 97%

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

Flynn

Durrett

Hunter

et al. 1999

SAE Technical Paper Series

323

201

View full text Add to dashboard Cite

show abstract

“…Средние за рабочие цикл значения указанных потоков лежат в пределах 40-90кВт/м2, что с точностью 10-18% совпадает с известными экспериментальными данными [5,6,7,16] и подтверждает адекватность предложенной ММ. Ее использование позволяет еще на стадии проектирования и доводки прогнозировать теплонапряженное состояние деталей, образующих КС, и решать ряд вопросов, связанных с повышением эксплуатационной надежности современных форсированных судовых дизелей.…”

Section: рис1 зональная модель излучающей системы в цилиндре судовоunclassified

Разработка Математической Модели Теплообмена Излучением В Камере Сгорания Судового Дизеля

Руднев¹,

Повалихина²

2017

Global Science. Development and Novelty

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Разработка математической модели теплообмена излучением в камере сгорания судового дизеля АннотацияПредставлена математическая модель (ММ) процесса локального теплообмена излучением в камере сгорания (КС) судового дизеля. В основу ММ положен зональный метод расчета теплообмена излучением. Приведена система алгебраических уравнений, аппроксимирующая соответствующую систему интегральных уравнений излучения. Показана роль эффективных потоков излучения в формировании результирующих радиационных потоков. Установлено, что влиянием эффективных потоков излучения можно пренебречь. Выполненные с использованием предложенной ММ расчеты позволили получить значения локальных результирующих потоков излучения для судового дизеля типа 6ЧН 24/36. Их сопоставление с известными опытными данными подтвердило адекватность разработанной ММ, расхождение расчетных и экспериментальных данных составило 10 -18%.Ключевые слова: теплообмен излучением, судовой дизель, зональный метод, математическая модель.

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“…1 Previous research proved that soot nuclei with a radius between 0.1 and 0.5 μm are able to deposit directly in the lung and result in serious health issues. Soot, once present within a flame, plays an important role in radiative heat transfer: 3,4 soot produces broadband incandescent radiation, which typically dominates over narrow-band radiation from intermolecular processes. In addition to the emissions challenge, soot formation in diesel engines can also influence the engine performance and have feedback effects on in-cylinder combustion and emission characteristics.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational investigation of temperature effects on soot mechanisms

Xiao

Qiao

et al. 2014

JSCS

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Effects of the initial ambient temperature on combustion and soot emission characteristics of diesel fuel were investigated through experiments conducted in an optical constant volume chamber and simulation using a phenomenological soot model. Four different initial ambient temperatures were adopted in this research: 1000, 900, 800 and 700 K. In order to obtain a better prediction of soot behavior, the phenomenological soot model was revised to take into account the feedback of soot oxidation on the soot number density and good agreement was observed in the comparison of soot measurement and prediction. The results indicated that the ignition delay was prolonged with decreasing initial ambient temperature. The heat release rate demonstrated the transition from mixing controlled combustion at high ambient temperatures to the premixed combustion mode at low ambient temperatures. At lower ambient temperatures, soot formation and the oxidation mechanism were both suppressed. However, the soot mass concentration was finally reduced with decreasing initial ambient temperature. Although the drop in ambient temperature did not cool the mean in-cylinder temperature during the combustion, it did shrink the total area of local high equivalence ratios, in which soot usually is rapidly generated. At an initial ambient temperature of 700 K, soot emissions were almost negligible, which indicates that sootless combustion might be achieved under super low initial temperature operation conditions.

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An Experimental Determination of the Instantaneous Potential Radiant Heat Transfer Within an Operating Diesel Engine

Cited by 81 publications

References 16 publications

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

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

Разработка Математической Модели Теплообмена Излучением В Камере Сгорания Судового Дизеля

Experimental and computational investigation of temperature effects on soot mechanisms

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