Effect of High Pressure Injection on Soot Formation Processes in a Rapid Compression Machine to Simulate Diesel Flames

Kamimoto, Takeyuki; Yokota, Haruyuki; Kobayashi, Haruo

doi:10.4271/871610

Cited by 74 publications

(32 citation statements)

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“…4, even when variable liquid density is considered in the Spalding model. SPRAY VAPORIZATION -The effect of the High Pressure and Spalding models on spray vaporization was tested by comparing the models to the experiments done by Kamimoto et al [33] and Hou et al [34]. The computations were done in 2 dimensions with 0.7x0.7 mm cell sizes.…”

Section: Resultsmentioning

confidence: 99%

“…Before applying the model to diesel sprays, single droplet computations were done to examine the behavior of the High Pressure model, then the KIVA-II code with both models was run separately to simulate the vaporizing spray experiments of Kamimoto et al [33] and Hou at al. [34] before simulating the combustion process in the Caterpillar engine.…”

Section: Resultsmentioning

confidence: 99%

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A New High Pressure Droplet Vaporization Model for Diesel Engine Modeling

Curtis

Uludogan

Reitz

1995

SAE Technical Paper Series

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A droplet vaporization model has been developed for use in high pressure spray modeling. The model is a modification of the common Spalding vaporization model that accounts for the effects of high pressure on phase equilibrium, transport properties, and surface tension. The new model allows for a nonuniform temperature within the liquid by using a simple 2-zone model for the droplet. The effects of the different modifications are tested both for the case of a single vaporizing droplet in a quiescent environment as well as for a high pressure spray using the KIVA II code. Comparisons with vaporizing spray experiments show somewhat improved spray penetration predictions. Also, the effect of the vaporization model on diesel combustion predictions was studied by applying the models to simulate the combustion process in a heavy duty diesel engine. In this case the standard and High Pressure vaporization models were found to give similar heat release and emissions results. However, the results show that a more realistic representation of the vaporization process is achieved with the new model. In particular, less unburned fuel is predicted to remain in the combustion chamber late in the power stroke.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A New High Pressure Droplet Vaporization Model for Diesel Engine Modeling

Curtis

Uludogan

Reitz

1995

SAE Technical Paper Series

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“…However, for high-pressure, high-temperature sprays, significant discrepancies between computations and experiments have been observed by . For example, computed vapor penetration results were found to under-estimate the measurements of Kamimoto (1987). Considerable effort has been spent on identifying the causes of this discrepancy and making corresponding modifications to the models.…”

mentioning

confidence: 99%

Center for Advanced Propulsion Systems

Borman¹,

Corradini²,

Farrell³

et al. 1993

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Public reporting burden for this c011ection of informatio IS estimated to averaage I hour Per response. including the time lot reiew0g mstructions, searching existing data source%.gathern and maintainr th, data needed, and completing and reviewing the collection of information Send comments regarding this burden estimate or any other aspect of this collection Of information, including suggestions for reducing this burden. SUPPLEMENTARY NOTESThe view, opinions and/or findings contained in this report are those of the author(s) and should not be construed as an official Department of the Army position, policy, or decision, unless so designated by other documentation. 12a. DISTRIBUTION / AVAILABIUTY STATEMENT 12b. DISTRIBUTION CODEApproved for public release; distribution unlimited. ABSTRACT (Maximum 200 words)This final report covers a six year period of research conducted by the Engine Research Center. The objectives of the ERC are: 1) to train students in special areas of diesel research of interest to the Army and its industrial suppliers, 2) provide a source of consultation for the Army, 3) provide knowledge and research tools for solution of long range problems of interest to the Army, 4) provide solution methods for problems of immediate interest to the Army, 5) to identify and explore new technologies which have potential value to the Army. A brief account is given of how these objectives were addressed. Subjects covered are; faculty, facilities, publications, and research results. The research topic areas discussed are: engine modeling; canbustion, emissions and fuels; heat transfer; fluid mechanics; diesel sprays; lubrication, mechanical design and materials.14. SUBJECT Comparison between measured and predicted cylinder 36 pressure (left) and wall heat flux (right) for premixedcharge SI engine combustion using heat transfer model with (modified case) and without (original) the effect of compressibility and unsteadiness. Engine speed 1500 rev/min. 7.1.2Comparison between computed (dashed line) and 36 measured (solid line) cylinder pressures (left) and wall heat flux (right) for compression ignited, homogeneous charge engine combustion (engine speed 1200 rev/min, compression ratio 10.5, swirl ratio 1.8, equivalence ratio 0.4). 7.1.3Predicted pressure histories obtained by incorporating the 39 multistep Shell ignition model (Case 2) and the standard one-step Arrhenius kinetics model (Case 1). 7.1.4Intake flow computation using the unstructured grid 40 version of KIVA-3 for stationary valves. 7.1.5Calculated cylinder pressures with and without ignition at 44 100 rpm and initial air temperatures of 241 K and 298 K. Optical window relative position to the combustion 61 chamber(part 2 of 2). 7.2.9The instrumentation system. 62 7.2.10 Flame temperature and soot concentration factor KL at 63 three angular positions for window A (24, 25, 26-3). 7.2.11Flame temperature and soot concentration factor KL at 64 three angular positions for window B (24, 25, 26-3). 7.2.12Flame temperature and soot concentration facto...

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“…Unúltimo modelo cero-dimensional que retiene de forma bastante completa la física de lo que ocurre durante la fase de difusión es el desarrollado por Arrègle et al [58,59] a partir del trabajo de Fenollosa [60]. Los autores basan la predicción de la tasa de combustión en la discretización de la masa inyectada en paquetes de masa para los cuales se obtiene el instante de combustión a partir del conocimiento de la tasa de inyección y del llamado tiempo aparente de combustión ('ACT').…”

Section: Análisis De La Ley De Liberación De Calorunclassified

“…A partir de un razonamiento de análisis dimensional, el flujo másico difusivo de combustible por unidad deárea se puede definir como el producto de la densidad por la fracción másica de combustible por una pseudo-velocidad 60 de difusión (g f = ρY f v dif ). Teniendo en cuenta, por otra parte, que el flujo másico difusivo estaba definido por la ley de Fick aplicado al caso turbulento (ecuación 4.3), queda la expresión para la pseudo-velocidad de difusión radial:…”

Section: Trayectorias Dentro Del Chorrounclassified

Aportaciones al estudio del proceso de combustión turbulenta de chorros en motores diesel de inyección directa.

Oliver¹,

María²

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Aquestos conceptes han sigut estesos posteriorment al cas del doll Diesel. D'aquesta manera s'han estudiat en apartats successius els problemes de l'evaporació, l'autoencés i la flama de difussió Diesel mitjançant resultats experimentals obtesos a partir de tècniques convencionals iòptiques. Els raonaments recolzats sobre els conceptes de doll gasós han permés acompletar una descripció senzilla però rigurosa dels processos físics relevants per a l'evol·lució dels dolls de combustible. AbstractThe overall objective of this thesis is aimed at the construction of the necessary conceptual tools in order to analyse in a simple way the physical mechanisms that govern the fuel spray combustion process under boundary conditions found in a Diesel direct injection engine with a 2-litre per cylinder displacement that is highly supercharged. The work stems from the knowledge of the isothermal Diesel spray behaviour existing in the research group where it has been developed. In the first place, a review has been carried out in order to identify aspects of the Diesel injection-combustion process that have to be taken into account in order to develop this simple description.On the other hand, the work is based on the widely accepted assumption that this description can be based on the analysis of the Diesel spray from the point of view of gas jets. According to this, an in-depth study on the gas jet has been carried out, based on numerical simulations and theoretical deductions. The mixture fraction, the state relationships and the equivalent diameter concepts have been adapted in a simple way in order to describe the gaseous jets from the most general perspective, both under inert and reacting conditions. Such concepts have been extended to the Diesel spray. In this way, the evaporation, autoignition and difusion flame processes have been studied by means of experimental results obtained from both conventional and optical techniques. Arguments based on gas jet concepts have made it possible to compile a simple but rigourous description of the physical processes relevant to the evolution of fuel sprays. AgradecimientosMe gustaría en estas líneas agradecer a mucha gente su colaboración directa o indirecta en esta tesis doctoral, y en cualquier otro aspecto de mi trabajo en la CMT. En primer lugar, agradezco a José María Desantes y a José Vicente Pastor por todo lo que de ellos he aprendido en todos estos años. Al primero, gracias por enseñarme a pensar y a razonar la Física, para poder analizar algo tan complicado como un chorro de forma sencilla, pero a la vez sin dejar de ser estrictos. A José Vicente, por haberme enseñado una gran parte de la (poca) Optica que sé.También quisiera agradecer al Dr. Franz Chmela la oportunidad que nos ha ofrecido de trabajar en un proyecto en el que probablemente lo principal era aprender, imaginar, pensar. . . . Muchos conceptos de esta tesis doctoral son fruto de esas horas dedicadas, en el sentido estricto de la palabra, a investigar.En la parte experimental es donde uno se da cuenta de la c...

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Effect of High Pressure Injection on Soot Formation Processes in a Rapid Compression Machine to Simulate Diesel Flames

Cited by 74 publications

References 2 publications

A New High Pressure Droplet Vaporization Model for Diesel Engine Modeling

A New High Pressure Droplet Vaporization Model for Diesel Engine Modeling

Center for Advanced Propulsion Systems

Aportaciones al estudio del proceso de combustión turbulenta de chorros en motores diesel de inyección directa.

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