Development of Methodology for Spray Impingement Simulation

Bai, Chengxin; Gosman, A. D.

doi:10.4271/950283

Cited by 423 publications

(280 citation statements)

References 13 publications

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“…The above phenomena depend on the drop Weber number (e.g., Naber and Reitz, 1989). Recent improvements account for the formation and breakup of liquid films (Bai and Gosman, 1995;Stanton, et al 1998). …”

Section: Drop Collision Coalescence Drag and Wall Interactionmentioning

confidence: 99%

Developments in Spray Modeling in Diesel and Direct-Injection Gasoline Engines

Kong

Senecal

Reitz

1999

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Progrès de la modélisation des sprays dans les moteurs Diesel et à essence -Dans les moteurs à injection directe, les caractéristiques du spray de carburant influent directement sur le rendement et les émis-sions. Les performances des modèles de spray existants et leur influence sur la combustion pour les moteurs Diesel et essence à injection directe sont analysées. Un modèle phénoménologique d'écoulement dans les injecteurs indiquant les effets de la géométrie sur les processus d'injection est présenté. Ce modèle donne les conditions initiales d'un modèle d'atomisation prenant en compte les instabilités de Kelvin-Helmholtz (KH) et Rayleigh-Taylor (RT). Une analyse de stabilité linéaire a aussi été menée pour prendre en compte l'atomisation des nappes liquides caractéristiques des injecteurs à swirl des moteurs à essence. Des résultats de simulations Diesel ont été comparés aux données obtenues avec des diagnostics laser sur des moteurs à accès optique Diesel ID de fort alésage pour une large gamme de conditions opératoires. Les résultats montrent que le modèle d'injecteur utilisé en combinaison avec le modèle d'atomisation (KH + RT) donne des résultats réalistes. En particulier, la courte pénétration liquide et les détails de forme des flammes sont bien reproduits. Le modèle d'atomisation de nappe a aussi été comparé avec succès à des pénétrations expérimentales et des données de taille de gouttes pour des injecteurs en cône creux. Ce modèle est en cours d'utilisation pour l'étude de la combustion en mode stratifié dans les moteurs GDI.Mots-clés : sprays, Diesel, modélisation, Kelvin-Helmholtz, Rayleigh-Taylor, injection directe. Kelvin-Helmholtz (KH) Abstract -Developments in Spray Modeling in Diesel and Direct-Injection Gasoline Engines -In directinjection engines the fuel spray characteristics influence the combustion efficiency and exhaust emissions. The performance of available spray models for predicting liquid and vapor fuel distributions, and their influence on combustion is reviewed for both diesel and gasoline direct injection engines. A phenomenological nozzle flow model is described for simulating the effects of diesel injector nozzle internal geometry on the fuel injection and spray processes. The flow model provides initial conditions for the liquid jet breakup model that considers wave instabilities due to

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Section: Drop Collision Coalescence Drag and Wall Interactionmentioning

confidence: 99%

Developments in Spray Modeling in Diesel and Direct-Injection Gasoline Engines

Kong

Senecal

Reitz

1999

Oil & Gas Science and Technology - Rev. IFP

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“…Most of the existing splashing models are in the spray field (reciprocating engines, gas turbines, spray cooling systems, inkjet printing, etc. ), such as the model of Bai & Gosman[1995],Trujillo et al [2000], Mundo et al[1995Mundo et al[ , 2001 and Han et al [2000]. However, since the application conditions of the models is far from SLD conditions, i.e., wall surface property, temperature, liquid water content (LWC), droplet sizes and velocities, in particular the flow structure and wall surface property, they cannot be used to predict the mass and momentum transports directly during SLD impingement.…”

Section: A C C E P T E D Mmentioning

confidence: 99%

A two-dimensional splashing model for investigating impingement characteristics of supercooled large droplets

Wang

Chang

Leng

et al. 2016

International Journal of Multiphase Flow

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“…The regimes that an impinging droplet may undergo differently were identified as stick, spread, rebound, rebound with break-up, boiling-induced break-up, break-up, and splash (Bai and Gosman, 1995). A UWS spray wall interaction also cannot be avoided in most SCR applications due to insufficient entrainment, slow evaporation and thermolysis, and the inertia of the droplets.…”

Section: Introductionmentioning

confidence: 99%

“…The fuel spray wall interaction has been investigated for many years (Senda et al, 1994;Bai and Gosman, 1995;Stanton and Rutland, 1996). The regimes that an impinging droplet may undergo differently were identified as stick, spread, rebound, rebound with break-up, boiling-induced break-up, break-up, and splash (Bai and Gosman, 1995).…”

Section: Introductionmentioning

confidence: 99%

Quasi 1D modeling of two-phase flow and deposit formation for urea-selective catalytic reduction systems

Gan

Yao

et al. 2016

J. Zhejiang Univ. Sci. A

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A quasi 1D model of two-phase flow for a urea-selective catalytic reduction (SCR) system is developed which can calculate not only the generation of reducing agent but also the formation of deposits in the exhaust pipe. The gas phase flow is solved through Euler method, variables are stored on staggered grids, and the semi-implicit method for pressure-linked equation (SIMPLE) algorithm is applied to decouple the pressure and velocity. The liquid phase is treated in a Lagrangian way, which solves the equations of droplet motion, evaporation, thermolysis, and spray wall interaction. A combination of a direct decomposition model and a kinetic model is implemented to describe the different decomposition behaviors of urea in the droplet phase and wall film, respectively. A new 1D wall film model is proposed, and the equations of wall film motion, evaporation, thermolysis, and species transport are solved. The position, weight, and components of deposits can be simulated following implementation of the semi-detailed kinetic model. The simulation results show that a decrease in the exhaust temperature will increase the wall film region and the weight of deposits. Deposit components are highly dependent on temperature. The urea-water-solution (UWS) injection rate can affect the total mass of wall film and expand the film region, but it has little influence on deposit components. An increase in exhaust mass flow can decrease the total weight of deposits on the pipe wall because of the promotion of the mass and heat transfer process both in the droplets and wall film.

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Development of Methodology for Spray Impingement Simulation

Cited by 423 publications

References 13 publications

Developments in Spray Modeling in Diesel and Direct-Injection Gasoline Engines

Developments in Spray Modeling in Diesel and Direct-Injection Gasoline Engines

A two-dimensional splashing model for investigating impingement characteristics of supercooled large droplets

Quasi 1D modeling of two-phase flow and deposit formation for urea-selective catalytic reduction systems

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