Relationship Between Diesel Fuel Spray Vapor Penetration/Dispersion and Local Fuel Mixture Fraction

Pickett, Lyle M.; Manin, Julien; Genzale, Caroline L.; Siebers, Dennis L.; Musculus, Mark P.; Idicheria, Cherian A.

doi:10.4271/2011-01-0686

Cited by 302 publications

(213 citation statements)

References 40 publications

Supporting

Mentioning

201

Contrasting

Unclassified

Order By: Relevance

“…Classical examples are those by Naber and Siebers [7], which have provided nonreacting penetration data in a wide range of gas densities (from 3.3 kg/m 3 to 58.6 kg/m 3 ) and air temperature values (from 600 to 1400K). More recent works [8] confirm that current knowledge of spray flow evolution under inert conditions is quite deep.…”

Section: Introductionsupporting

confidence: 55%

“…This parameter has been extensively used in many spray studies to characterize the inert spray radial spreading rate [8,25,32,35], in spite of some uncertainties related to the differences in definition among different groups and well-known limitations of the schlieren technique to objectively resolve the spray limit from a background flow [8]. Images in Figure 5 enable the identification of a sharp contour for the reacting case.…”

Section: Figure 3 Tomentioning

confidence: 99%

“…Both experiments and model results have been considered. Experimental injection data as well as ambient conditions are input for the 1D model, which has been calibrated in the same way as in [8,25] by fitting spray cone angle so that experimental inert penetration is adequately predicted. Considering the degree of accuracy in the prediction of inert spray penetration with similar 1D models, recent approaches have shown that spatial distribution of mixture fraction is also adequate [8].…”

Section: D Spray Modeling Considerations On Transient Flame Penetrationmentioning

confidence: 99%

See 2 more Smart Citations

An experimental analysis on the evolution of the transient tip penetration in reacting Diesel sprays

Desantes

Pastor

García-Oliver

et al. 2014

Combustion and Flame

View full text Add to dashboard Cite

Schlieren imaging has helped deeply characterize the behavior of diesel spray when injected into an oxygen-free ambient. However, when considering the transient penetration of the reacting spray after autoignition, i.e. the Diesel flame, few studies have been found in literature. Differences among optical setups as well as among experimental conditions have not allowed clear conclusions to be drawn on this issue. Furthermore, soot radiation may have a strong effect on the image quality, which cannot be neglected.The present paper reports an investigation on the transient evolution of Diesel flame based upon schlieren imaging. Experimental conditions have spanned values of injection pressure, ambient temperature and density for typical Diesel engine conditions. An optimized optical setup has been used, which makes it possible to obtain results without soot interference. Based on observations for a long injection event (4 ms Energizing Time), the analysis has resorted to extensive comparison of inert and reacting sprays parameters, which have made it possible to define different phases after autoignition.Shortly after autoignition, axial and radial expansion of the spray have been observed in terms of axial penetration and radial cone angle. After that, during a stabilization phase, the reacting spray penetrates at a similar rate as the inert one. Later, the reacting spray undergoes an acceleration period, where it penetrates at a faster rate than the inert one. Finally, the flame enters a quasi-steady penetration phase, where the ratio of reacting and inert penetration stabilizes at a nearly constant value. The duration of the reacting spray penetration stages shows modifications when varying engine parameters such as air temperature, air density, injection pressure, and nozzle diameter. However, the proportionality between reacting and inert penetration has been observed to depend mainly on temperature, in agreement with observed reductions in entrainment when shifting from inert to reacting conditions.

show abstract

Section: Introductionsupporting

confidence: 55%

Section: Figure 3 Tomentioning

confidence: 99%

Section: D Spray Modeling Considerations On Transient Flame Penetrationmentioning

confidence: 99%

See 1 more Smart Citation

An experimental analysis on the evolution of the transient tip penetration in reacting Diesel sprays

Desantes

Pastor

García-Oliver

et al. 2014

Combustion and Flame

View full text Add to dashboard Cite

show abstract

“…Therefore, the spreading angle measured is strictly related to the optical setup and the segmentation method used [18]. For this reason, the spreading angle results of this study will be presented, but only used for qualitative comparisons between tests carried out in the same test rig, where conditions of both illuminating light intensity and orientation remain unchanged.…”

Section: Image Processing Methodsmentioning

confidence: 99%

Engine combustion network: Influence of the gas properties on the spray penetration and spreading angle

Payri

Bardi

et al. 2014

Experimental Thermal and Fluid Science

View full text Add to dashboard Cite

In this work, three Engine Combustion Network (ECN) single-hole nozzles with the same nominal characteristics have been tested under a wide range of conditions measuring spray penetration and spreading angle. n-dodecane has been injected in nonevaporative conditions at different injection pressures ranging from 50 to 150 MPa and several levels of ambient densities from 7.6 to 22.8 kg/m 3 . Nitrogen and Sulphur Hexafluoride (SF 6 ) atmospheres have been explored and,in the first case, a temperature sweep from 300 to 550 K at constant gas density has been executed. Mie scattering has been used as the optical technique by employing a fast camera, whereas image processing has been performed through a home-built Matlab code. Differences in spray penetration related to spray orifice diameter, spreading angle and start of injection transient have been found for the three injectors. Significant differenceshave been obtained when changing the ambient gas, whereas ambient temperature hardly affects the spray characteristics up to 400 K. However, a reduction in penetration has been observed beyond this point, mainly due to the sensitivity limitation of the technique as fuel evaporation becomes important. The different behavior observed when injecting in different gases could be explained due to the incomplete momentum transfer between spray droplets and entrained gas, together with the fact that there is an important change in speed of sound for the different gases, which affects the initial stage of the injection.

show abstract

“…A região diluída é normalmente referida como a área em que o processo de atomização termina. Nesta região, a espessura óptica do spray permite a aplicação de técnicas convencionais [51,52]. Desta forma, caracteriza-se o spray, na saída do bocal como um núcleo líquido intacto.…”

Section: Regimes Do Sprayunclassified

Modelo De PDF Presumida Com Cinética Química Tabulada Aplicada Para a Combustão Em Sprays

SOUZA¹

View full text Add to dashboard Cite

A Deus, que me concedeu força, sabedoria e sustento para a realização desse trabalho.Ao meus orientadores Professor Sérgio Leal Braga e Professor Wladimyr Mattos da Costa Dourado pela confiança e parceria e ajuda em momentos difíceis durante a realização dessa tese.A PUC -Rio e a CAPES, pelo suporte financeiro e auxílios concedidos para o desenvolvimento.Ao INMETRO, Dra. Maria Helena Farias e Dr. Renan Teixeira pelo auxílio na utilização de computadores para a geração de resultados.Ao IAE por pelo suporte e a utilização de suas instalações. Aos meus amigos do INPE Bruno Trevisan, Guilherme Sempionato, Danilo Oliveira e Rafael Siqueira pela amizade, apoio e compressão. Neste trabalho, foi desenvolvida uma modificação do modelo para simulação de sprays Diesel com o método de PDF presumida e cinética química tabulada. Através do acoplamento entre a parte química e a parte turbulenta, avaliou-se os efeitos do spray com a metodologia flamelet. Onde o conceito flamelet trata a chama difusiva e transiente como um conjunto de chamas unidimensionais, utilizando o modelo de PDF presumida para a avaliação dos valores turbulentos. A validação do modelo foi realizada com dados experimentais do laboratório Sandia, em uma câmara a volume constante. A validação e a aplicação do modelo foram conduzidas em diferentes tipos de ensaios experimentais: avaliação e comparação para diferentes modelos de cinética química do n-heptano, validação do método para o modelo de turbulência k − ϵ na câmara de volume constante do Sandia para o n-heptano não reativo, validação e comparação do modelo para o spray reativo e aplicação de modelo para o estudo comprimento do ancoramento de chama e para o tempo de atraso de ignição do n-heptano para diferentes temperaturas ambientes. Em geral,a modelagem proposta tem demonstrado excelente capacidade de previsão para a combustão com spray Diesel numa vasta gama de aplicações e é um candidato altamente promissor para outras aplicações em motores Diesel. In this work, a modification of the model for the simulation of diesel sprays with the presumed PDF method and tabulated chemical kinetics was developed. Through the coupling between the chemical part and the turbulent part, the effects of the spray were evaluated for the flamelet methodology. Where the textit flamelet concept treats the diffusive and transient flame as a set of one-dimensional flames, using the presumed PDF model for the evaluation of turbulent values. The validation of the model was performed with experimental data from the Sandia laboratory, in a chamber at constant volume. The validation and application of the model were conducted in different types of experimental trials: evaluation and comparison for different chemical kinetics models of n-heptane, validation of the method for the turbulence model k−ϵ in the constant volume chamber of the Sandia for non-reactive n-heptane, validation and comparison of the model for the reactive spray and model application for the study of the flame anchoring length and for the ignition delay time of...

show abstract

Relationship Between Diesel Fuel Spray Vapor Penetration/Dispersion and Local Fuel Mixture Fraction

Cited by 302 publications

References 40 publications

An experimental analysis on the evolution of the transient tip penetration in reacting Diesel sprays

An experimental analysis on the evolution of the transient tip penetration in reacting Diesel sprays

Engine combustion network: Influence of the gas properties on the spray penetration and spreading angle

Modelo De PDF Presumida Com Cinética Química Tabulada Aplicada Para a Combustão Em Sprays

Contact Info

Product

Resources

About