Modeling the Effects of Fuel Spray Characteristics on Diesel Engine Combustion and Emission

Patterson, Mark; Reitz, Rolf D.

doi:10.4271/980131

Cited by 429 publications

(164 citation statements)

References 16 publications

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“…The generalized RNG k-ɛ turbulence model proposed by Wang and Reitz [36] was applied to improve the prediction of fuel mixture distribution under nonreacting condition. The spray breakup process was predicted by the KH-RT instability model [37,38]. A reduced n-dodecane-PAH mechanism with 100 species and 432 reactions was used to predict the n-dodecane combustion and PAH formation processes [39] using a well-mixed model.…”

Section: University Of Wisconsin Usa (Uw)mentioning

confidence: 99%

A Progress Review on Soot Experiments and Modeling in the Engine Combustion Network (ECN)

Skeen

Manin

Pickett

et al. 2016

SAE Int. J. Engines

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The 4th Workshop of the Engine Combustion Network (ECN) was held September 5-6, 2015 in Kyoto, Japan. This manuscript presents a summary of the progress in experiments and modeling among ECN contributors leading to a better understanding of soot formation under the ECN “Spray A” configuration and some parametric variants. Relevant published and unpublished work from prior ECN workshops is reviewed. Experiments measuring soot particle size and morphology, soot volume fraction (fv), and transient soot mass have been conducted at various international institutions providing target data for improvements to computational models. Multiple modeling contributions using both the Reynolds Averaged Navier-Stokes (RANS) Equations approach and the Large-Eddy Simulation (LES) approach have been submitted. Among these, various chemical mechanisms, soot models, and turbulence-chemistry interaction (TCI) methodologies have been considered

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Section: University Of Wisconsin Usa (Uw)mentioning

confidence: 99%

A Progress Review on Soot Experiments and Modeling in the Engine Combustion Network (ECN)

Skeen

Manin

Pickett

et al. 2016

SAE Int. J. Engines

Self Cite

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“…The KHRT is based on the work by Beale andReitz, 1999 andPatterson andReitz, 1998. It combines the effects by Kelvin-Helmholtz instabilities and Rayleigh-Taylor instabilities due to aerodynamic acceleration.…”

Section: Khrtmentioning

confidence: 99%

Numerical Analysis of Urea-SCR Sprays under Cross-Flow Conditions

Heide¹,

Karlsson²,

Altimira³

2017

SAE Technical Paper Series

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Department of Mechanics Master of Science Numerical analysis of Urea-SCR sprays under cross-flow conditionsby Jakob HEIDE The mixing and evaporation of Diesel Exhaust Fluid (DEF) inside an Urea Selective Catalyst Reduction (SCR) chamber has been numerically investigated. The first task in this work has been to first look into the numerical framework and assess the models available in a commercial CFD software (ANSYS Fluent 14.5). Secondly the knowledge inherited from the model sensitivity analysis will be applied on the practical case of an Urea-SCR mixing chamber. Mass flow rate and temperature effects of the exhaust gas on the mixing and evaporation of the DEF spray has been investigated. The results indicate that evaporation rates inside the mixing chamber are dependent on the mass flow rate of the exhaust gas but not on the temperature due to compressibility effects of the exhaust gas. For a constant mass flow rate an increase in temperature decreases the residence time of droplets (due to compressibility) with a similar order of magnitude as the individual droplet evaporation rate increases (due to higher temperature) thus the two effects balances each other. The results could potentially contribute to the development and optimization of current SCR systems.

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“…In the literature of industrial atomizers, outcomes of Equations (11) and (17) are more commonly compared with D 32 (Patterson and Reitz 1998;Senecal et al 1999;Larmi and Tiainen 2003;Park et al 2009), which is more widely used in spray applications. Figures 4-6 show that the droplet size predictions by the jet and sheet breakup models agree more closely with the measured D 10 value.…”

Section: Droplet Size Predictionsmentioning

confidence: 99%

Transient aerodynamic atomization model to predict aerosol droplet size of pressurized metered dose inhalers (pMDI)

Gavtash

Versteeg

Hargrave

et al. 2017

Aerosol Science and Technology

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Pressurized metered dose inhalers (pMDI) produce large numbers of droplets with smaller sizes than 5 mm to treat asthma and other pulmonary diseases. The mechanism responsible for droplet generation from bulk propellant liquid is poorly understood, mainly because the small length scales and short time scales make it difficult to characterize transient spray formation events. This article describes the development and findings of a numerical atomization model to predict droplet size of pharmaceutical propellants from first principles. In this model, the velocity difference between propellant vapor and liquid phase inside spray orifice leads to formation of wave-like instabilities on the liquid surface. Two variants of the aerodynamic atomization model are presented based on assumed liquid precursor geometry: (1) cylindrical jet-shaped liquid ligaments surrounded by vapor annulus; (2) annular liquid film with vapor flow in the core. The growth of instabilities on the liquid precursor surfaces and the size of the subsequently formed droplets are predicted by numerical solutions of dispersion equations. The droplet size predictions were compared with phase doppler anemometry (PDA) data and the predictions were in good agreement with the number mean diameter D 10 , which is representative of the respirable droplets. The temporal behavior of droplet size production was captured consistently well during the period of the first 95% of the propellant mass emission. The outcome of our modeling activities also suggests that, in addition to saturated vapor pressure of the propellant, its viscosity and surface tension are also key properties that govern pMDI droplet size. EDITORWarren Finlay

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Modeling the Effects of Fuel Spray Characteristics on Diesel Engine Combustion and Emission

Cited by 429 publications

References 16 publications

A Progress Review on Soot Experiments and Modeling in the Engine Combustion Network (ECN)

A Progress Review on Soot Experiments and Modeling in the Engine Combustion Network (ECN)

Numerical Analysis of Urea-SCR Sprays under Cross-Flow Conditions

Transient aerodynamic atomization model to predict aerosol droplet size of pressurized metered dose inhalers (pMDI)

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