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2 edition of Numerical modelling of fuel spray impingement and wall film formation. found in the catalog.

Numerical modelling of fuel spray impingement and wall film formation.

David Kennaird

Numerical modelling of fuel spray impingement and wall film formation.

by David Kennaird

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  • 21 Currently reading

Published .
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Edition Notes

ContributionsUniversity of Brighton. School of Engineering., Ricardo Consulting Engineers.
ID Numbers
Open LibraryOL18588858M

Near Wall Reactive Flows: Numerical Modelling and Validation Experiments. spray impingement on walls occurs under a wide range of situations in engines (LPP gas turbines, port fuel injection (PFI) gasoline engines, direct injection (DI) spark ignition engines, exhaust gas after-treatment (EGAT) through Selective Catalytic Reaction (SCR.   Drake, T. D. Fansler, A. S. Solomon, and G. A. Szekely, “ Piston fuel films as a source of smoke and hydrocarbon emissions from a wall-controlled spark-ignited direct-injection engine,” SAE Technical Paper , Author: Fabian Reuter, Sebastian A. Kaiser.

  Abstract: The spatial and temporal evolution of an automotive hollow-cone-type spray was investigated with laser-based imaging diagnostics. Optical conditions of an IC engine were emulated with a test cell that was built from an engine cylinder head to hold a high-pressure gasoline-fuel by: used to model the fuel spray, which is composed by a discrete A flat plate was added to the experimental apparatus for investigation of the spray-wall impingement and liquid-film images were acquired. On the basis of the experimental database, a CFD methodology for gasoline spray for GDI engines the wall film liquid formation on the.

Spray Characteristics and Wall Impingement of Diesel-CNG Dual Fuel Jet Using Schlieren Imaging Technique Mhadi A. Ismael, M. R. Heikal, and M. B. Bahroom Abstract —Natural gas for direct-injection (DI) compression ignition (CI) engines is considered to be the best optimized method due to its high volumetric efficiency, high thermal efficiency. This article is concerned with aspects of gasoline spray droplet impingement simulation, for which an improved model has been developed for predicting the outcomes of spray droplets impacting on a wall. The model is assessed by simulating experiments on oblique spray impingement in a wind tunnel.


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Numerical modelling of fuel spray impingement and wall film formation by David Kennaird Download PDF EPUB FB2

In this study, a new submodel concerning fuel film formation process is proposed in order to simulate the behavior of diesel spray impingement on relatively low temperature wall surface. Here, super - heating degree of the surface, defined by the temperature difference between Cited by: The numerical results obtained through the previously described model for spray impingement were compared to the measurements performed by Katsura et al.,Saito et al.,Fujimoto et al., The experimental conditions are reported in Table fuel spray emerges from a single hole nozzle and impinges upon a wall at a distance of 24 mm from the tip of the injector for tests 1, 3 Cited by: Modeling of diesel spray impingement on a flat wall Article (PDF Available) in Journal of Mechanical Science and Technology 14(7) May with Reads How we measure 'reads'.

The goal of the present research is to contribute to improve the knowledge about the spray impingement topic through a numerical study that is aimed at investigating the impact of using the dissipative energy terms that are available in the literature when they are embedded into a specific dispersion by:   This paper presents a mathematical model for the prediction of the dynamic characteristics of wall films formed by impinging sprays.

The model takes into account the impingement pressure due to bombardment of impinging droplets, tangential momentum transfer resulting from oblique droplet impingement on the film surface, and the gas shear force at the film by: The numerical results capture the wavy variation of film thickness during the fuel film formation and transport along the solid surface from the time of impingement until equilibrium conditions.

Spray impingement and fuel film formation models with cavitation have been developed and incorporated into the computational fluid dynamics code, STAR-CD.

The spray/wall interaction process was modeled by considering the effects of surface temperature conditions and fuel film formation. The behavior of fuel droplets after impingement was divided into rebound, spread and Cited by: 6. The numerical analysis was performed based on the Eulerian-Lagrangian approach using STAR CCM+ CFD code.

Secondly, the resultant phenomena due to spray-wall impingement such as fluid film generation and transport, solid deposit formation, and thermal decomposition were recorded using a high-speed camera operating at a low frame : G.M.

Hasan Shahariar, Ock Taeck Lim. •Develop DNS model of film formation dynamics, droplet splashing and rebound. Summary •Model film formation on an heated wall.

Accomplishment Impinging plates Complete fabrication and functional (~ up to K) Spray-wall impingement test Complete first -round impinging characterization test and data used for LE model development.

Gasoline direct injection (GDI) increases engine power output and reduces emissions. In GDI engines, increasing injection pressure improves atomization, which increases thermal efficiency at the cost of wall wetting.

When wall wetting occurs, both soot emissions and fuel consumption increase. Wall wetting in GDI engines under cold driving conditions has rarely been by: 8. The impingement of fuel sprays on the wall in direct-injection spark-ignition (DISI) engines affects mixture preparation, combustion performance, and pollutant emissions.

A better understanding of the fuel film behaviors is required to reduce exhaust emissions and fuel by: 9. The work presented forms part of an ongoing investigation, focusing on modeling the motion of a wall oil film present in a bearing chamber and comparison to existing experimental data.

The film is generated through the impingement of oil droplets shed from a roller by:   A numerical and analytic study of film formation and evolution during spray impingement is presented.

For the part of the film which excludes drop impact locations, the governing equations reduce to a convenient form that can be exploited using a Lagrangian particle by: Measurement and Simulation of DI Spray Impingements and Film Characteristics Yi Zheng1*, impingement and surface fuel film formation by sprays emerging from a side-mounted six-hole gasoline injector, detailed information on mixture formation and spray impingement.

Numerical methods are still a. fuel spray performance [7]. For example, the spray penetration length must neither be too long nor short in a combustion chamber.

If too long, impingement could occur resulting in wetting of cylinder walls and/or piston crown [8]. Spray-wall impingement can be characterized into radial penetration along the wall and jet height.

Furthermore, the wall film formed in the spray wall impingement process directly affects fuel/air mixture formation, combustion, exhaust emissions and oil quality subsequently. In this paper, the wall film distribution of DME/diesel blended fuels formed during the spray wall impingement process has been experimentally by: 7.

12th ICLASS Liquid Film Dynamic on the Spray Impingement Modelling which has meanwhile been modified and improved (see Ref. [5]), and the performance is recognized through the comparison between the numerical results - with and without the liquid layer - and the measurements for two crossflow rates.

This work was more toward improving knowledge of numerical modelling (e.g. heat transfer due to direct contacts of drops with the wall, the stochastic motion of drops, and non-isotropic turbulent fluctuations) rather than adding a new thermal conclusion to literature.

Su et al. [3] conducted an experimental. The spray breakup models in CFX are designed for spray formation from injectors - specifically fuel injection nozzles.

As this does not involve impact with the wall they are not appropriate. So the spray models which involve particles hitting a wall are the particle-wall interaction models and quasi static wall film model. This paper describes the development and application of a novel optical technique for the measurement of liquid film thickness formed on surfaces during the impingement of automotive fuel sprays.

The technique makes use of the change of the light scattering characteristics of a metal surface with known roughness, when liquid is deposited.

The thin-film assumption allows integration of the transport equations in the wall-normal direction to obtain a set of equations for the film height, the wall-tangential components of velocity, and the mean film temperature.

This integration results in a two-dimensional flow model. Upon integration, the mean film.Jet Impingement Heat Transfer: Physics, Correlations, and Numerical Modeling improving fuel economy, and raising turbine power output perunit weight. Modern turbines The same air canbe routed to a perforated internal wall to form impinging jets directed at .Experimental investigation on wall film distribution of dimethyl ether/diesel blended fuels formed during spray wall impingement Yu, H, Liang, X, Shu, G, Wang, X, Wang, Y and Zhang, H'Experimental investigation on wall film distribution of dimethyl ether/diesel blended fuels formed during spray wall impingement', Energies, vol.

9, no. 11,pp. Cited by: 7.