Mathematical Modelling of Wall Films Formed by Impinging Sprays

Bai, Chengxin; Gosman, A. D.

doi:10.4271/960626

Cited by 132 publications

(44 citation statements)

References 8 publications

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“…This thin film assumption is justified by estimations done in [8] and [20] which reveals that the maximum film thickness is less than 500 µm for typical SI engine conditions. -The liquid film flow is laminar, though it may have waves on its surface.…”

Section: Integral Film Equationsmentioning

confidence: 81%

“…Nagaoka et al [17] used a particle film model in 3D calculations of SI engines. Stanton et al [18,19], Bai et al [20] and AhmadiBefrui et al [21], Foucart et al [22,23], have developed liquid film models using eulerian continuous approaches. The major physical mechanisms affecting the liquid film are ( Fig.…”

Section: Model Descriptionmentioning

confidence: 99%

“…In this case, the rate of vaporization is obtained from the following energy balance at the liquid-air interface: (20) The superheated liquid temperature T sh is the solution of the energy equation (Eq. (29)) where J g is given by Equation (10) using the rate of evaporation m · v .…”

Section: Volume Source Term S ·mentioning

confidence: 99%

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Influence of the Wall Temperature on the Mixture Preparation in Di Gasoline Engines

Habchi

Foucart²,

Baritaud

1999

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Influence de la température de paroi sur la préparation du mélange dans les moteurs à essence à injection directe -Des modèles d'interaction spray-paroi et de film liquide ont été développés et appliqués afin de mieux décrire la distribution du carburant dans les moteurs à essence à injection directe sur une géométrie de concept wide spacing. Plusieurs calculs prenant également en compte la combustion ont été effectués pour étudier l'influence de la température du piston sur la préparation du mélange en condition stratifiée. Lors des phases de démarrage à froid, jusqu'à 25 % de la masse injectée participe à la formation d'un film dans le bol du piston. Ceci influe considérablement sur la combustion. L'élévation de la température du piston réduit la quantité de film formé et non brûlé. Il ne reste quasiment pas de film quand sa température dépasse la moyenne entre la température d'ébullition et la température de Leidenfrost du carburant. Ce résultat est en accord avec des observations expérimentales qui confirment l'absence de film liquide pour des températures de paroi supérieures à 460 K.Mots-clés : Modélisation, moteur, injection directe, préparation du mélange, film liquide, interaction spray-paroi, évaporation. Abstract -Influence of the Wall température on the Mixture Preparation in DI Gasoline Engines

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Section: Integral Film Equationsmentioning

confidence: 81%

Section: Model Descriptionmentioning

confidence: 99%

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Influence of the Wall Temperature on the Mixture Preparation in Di Gasoline Engines

Habchi

Foucart²,

Baritaud

1999

Oil & Gas Science and Technology - Rev. IFP

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“…[58][59][60][61] Further advances included the representation of surface films, using either continuous formulations or discrete (particle-based) formulations. [62][63][64] These models form the foundation of the main approaches currently used in car surface contamination simulations.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Surface contamination of cars: A review

Gaylard

Kirwan

Lockerby

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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This review surveys the problem of surface contamination of cars, which poses a growing engineering challenge to vehicle manufacturers, operators and users. Both the vision of drivers and the visibility of vehicles need to be maintained under a wide range of environmental conditions. This requires managing the flow of surface water on windscreens and side glazing. The rate of deposition of solid contaminants on glazing, lights, licence plates and external mirrors also needs to be minimised. Maintaining vehicle aesthetics and limiting the transfer of contaminants to the hands and clothes of users from soiled surfaces are also significant issues. Recently, keeping camera lenses clean has emerged as a key concern, as these systems transition from occasional manoeuvring aids to sensors for safety systems. The deposition of water and solid contaminants on to car surfaces is strongly influenced by unsteady vehicle aerodynamic effects. Airborne water droplets falling as rain or lifted as spray by tyres interact with wakes, vortices and shear flows and accumulate on vehicle surfaces as a consequence. The same aerodynamic effects also control the movement of surface water droplets, rivulets and films; hence, particular attention is paid to the management of surface water over the front side glass and the deposition of contaminants on the rear surfaces. The test methods used in the automotive industry are reviewed, as are the numerical simulation techniques.

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“…As reviewed elsewhere in these proceedings [28] and in [29], models of different levels of capability are now available for nearly all fuel injection processes (at least for Diesel engines), including: Ð pump/line simulation; Ð flow in the nozzle including cavitation [28,30,31]; atomisation [28,[32][33][34]; Ð spray motion and evaporation [29,35]; Ð wall impingement [36,37] and film formation and evaporation [38][39][40].…”

Section: Fuel Injection and Spraysmentioning

confidence: 99%

State of the Art of Multi-Dimensional Modeling of Engine Reacting Flows

Gosman

1999

Oil & Gas Science and Technology - Rev. IFP

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RŽsumŽ Ñ ƒtat de lÕart de la modŽlisation multidimensionnelle pour les Žcoulements rŽactifs dans les moteurs Ñ Cet article dresse un aper•u de lÕŽtat de lÕart et des perspectives de lÕutilisation de la modŽlisation 3D pour lÕanalyse et le dŽveloppement des moteurs. Les aspects abordŽs comprennent lÕacquisition des gŽomŽtries, la gŽnŽration des maillages, les mŽthodologies numŽriques, la modŽlisation mathŽmatique des phŽnom•nes physiques importants, lÕexploitation des calculateurs parall•les et lÕapplication industrielle. Les conclusions principales de cette analyse font appara"tre les points suivants : Ð les mŽthodologies numŽriques et la gŽnŽration des maillages, associŽes au calcul parall•le, permettent maintenant de raccourcir notablement le cycle total de simulation ; Ð la modŽlisation physique a atteint sa maturitŽ dans la plupart des aspects relatifs ˆ la simulation de la combustion en allumage commandŽ ; en revanche, elle reste encore ˆ acquŽrir en ce qui concerne la combustion Diesel et certains aspects des processus reliŽs aux sprays ; Ð globalement, lÕutilisation de la simulation 3D pour la conception des moteurs est en forte augmentation ; Ð les dŽveloppements futurs, dont lÕutilisation de la LES, promettent une amŽlioration croissante des rŽsultats.Mots-clŽs : moteur, combustion, simulation 3D, aper•u. Abstract Ñ State of the Art of Multi-Dimensional Modeling of Engine Reacting Flows

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Mathematical Modelling of Wall Films Formed by Impinging Sprays

Cited by 132 publications

References 8 publications

Influence of the Wall Temperature on the Mixture Preparation in Di Gasoline Engines

Influence of the Wall Temperature on the Mixture Preparation in Di Gasoline Engines

Surface contamination of cars: A review

State of the Art of Multi-Dimensional Modeling of Engine Reacting Flows

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