Experimental and Numerical Analysis of Spray Dispersion and Evaporation in a Combustion Chamber

Chrigui, M.; Sadiki, A.; Janicka, J.; Hage, Michael; Dreizler, Andreas

doi:10.1615/atomizspr.v19.i10.30

Cited by 15 publications

(8 citation statements)

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“…The full coupling between the phases is used. Turbulence dispersion of droplets is calculated with a random walk model and the turbulence modulation is modeled as proposed by Chrigui et al [4]. The combustion modeling is done with a modified flame sheet approach, where the statistical treatment for the turbulent fluctuations is implemented with a jointed mixture fraction-enthalpy b-PDF approach.…”

Section: Discussionmentioning

confidence: 99%

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Numerical simulation of an ethanol turbulent spray flame with RANS and diffusion combustion model

Filho

Fukumasu

Krieger

2013

J Braz. Soc. Mech. Sci. Eng.

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A detailed numerical simulation of ethanol turbulent spray combustion on a rounded jet flame is presented in this article. The focus is to propose a robust mathematical model with relatively low complexity submodels to reproduce the main characteristics of the coupling between both phases, such as the turbulence modulation, turbulent droplets dissipation, and evaporative cooling effect. A RANS turbulent model is implemented. Special features of the model include an Eulerian-Lagrangian procedure under a fully two-way coupling and a modified flame sheet model with a joint mixture fractionenthalpy b-PDF. Reasonable agreement between measured and computed mean profiles of temperature of the gas phase and droplet size distributions is achieved. Deviations found between measured and predicted mean velocity profiles are attributed to the turbulent combustion modeling adopted.

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Section: Discussionmentioning

confidence: 99%

“…It is worthy to notice that the source terms associated with the transport and evaporation of droplets have the same formulation given in Chrigui et al [4], except for the mixture fraction and its variance which follow Chrigui et al [5].…”

Section: Gas Phase Equationsmentioning

confidence: 91%

Numerical simulation of an ethanol turbulent spray flame with RANS and diffusion combustion model

Filho

Fukumasu

Krieger

2013

J Braz. Soc. Mech. Sci. Eng.

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“…In this paper test stand to study the combustion process in the conditions of the model are presented. The test results under the model conditions will be used in calculations of numerical modelling with the use of ANSYS FLUENT [1,2]. The test stand reflects the combustion processes which occur in the boundary layer [10].…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, widely distributed computational codes are fluid dynamics (CFD -Computational Fluid Dynamics). Modelling of combustion processes is of interest to a number of authors [2,3,4,5,6,15].…”

Section: Introductionmentioning

confidence: 99%

Test Stand for Modelling of Combustion Processes of Liquid Fuels

Jankowski

2014

Journal of KONES. Powertrain and Transport

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Boundary layer is a reflection of the phenomena occurring in the combustion of liquid fuels with perpendicular to the surface of adding mass. For study the influence the thermal boundary layer on the process of combustion a special test stand has been developed, in which the flow of the medium with the addition of mass can be realized. Quartz windows and magnesium oxide powder, which is added for allow visualization of the airflow stream. Quartz windows are placed in the sidewalls of the chamber. The paper presents the test stand. The test stand consists of the following main components: test chamber, the main air preparation module, auxiliary air preparation module, module of particulate cartridge, air compressor, compensation tank, control unit and accessories in the form of filters, valves, pressure gauges and automatic control. Velocity of flow through the test chamber is controlled with air pressure from air preparation units and with the location of the regulatory fin at the end of the measuring chamber. The cartridge unit produces a homogeneous mixture of MgO particulates in air. Test results of the axial velocity profile at a distance of L=0.35 m obtained with LDA and PDPA laser equipment and ANSYS FLUENT numerical computations. Important for the combustion process is laminar boundary layer in laminar flow and laminar sublayer in turbulent flow.

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“…A representação da produção e dissipação da energia cinética turbulenta da fase dispersante pela presença das gotículas foi feita com a consideração da modulação de turbulência. Para isso foi utilizado o modelo padrão, o qual também foi utilizado em Chrigui et al (2009).…”

Section: Dispersão Turbulenta E Modulação De Turbulênciaunclassified

Simulações de chamas turbulentas de etanol com modelo de turbulência k-E.

Filho¹,

Luiz²

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Several industrial equipments use combustion processes with sprays. The main advantages of this process are related to the increase in the flame control and in the safety of liquid fuel logistics. Currently, the interest on the utilization of biofuels as an alternative to the reduction of carbon dioxide emissions is increasing. Among the types of biofuels the ethanol stands out by being used blended with gasoline in the transport sector of several countries. From this overview, this work presents the modeling and simulation of an ethanol turbulent spray flame. The results of the simulations were compared with experimental data from the literature. The resulting model was based on the finite volume method for low Mach number and steady state flows. The spray was calculated using the Separated Flow method (SF) with an Euler-Lagrange model, where the gaseous phase was described by an Eulerian model and the liquid phase by a Lagrangian particle method. Both phases were fully coupled in order to account for shared effects. The turbulence model k-ε Standard was used to determine the dispersant phase. Evaporation of droplets was calculated with the assumption of the infinite-liquid-conductivity model, where the droplet inner temperature is uniform, but varies with the mass and heat transfer within the dispersant phase. To reproduce the effects of the evaporative cooling the combustion was modeled with a modified flamesheet model which regarded a jointed mixture fraction-enthalpy β-PDF. Radiactive heat transfer was not accounted for in this work. Reasonable agreement between measured and computed mean profiles of temperature of the gas phase and droplet size distributions was achieved. Some deviations were observed in the mean velocity profiles comparisons between experimental data and simulations, which were assigned to the over predicted diffusion of the mean quantities transported by the gas phase.

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Experimental and Numerical Analysis of Spray Dispersion and Evaporation in a Combustion Chamber

Cited by 15 publications

References 0 publications

Numerical simulation of an ethanol turbulent spray flame with RANS and diffusion combustion model

Numerical simulation of an ethanol turbulent spray flame with RANS and diffusion combustion model

Test Stand for Modelling of Combustion Processes of Liquid Fuels

Simulações de chamas turbulentas de etanol com modelo de turbulência k-E.

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