Combined surface density concepts for dense spray combustion

Jay, Stéphane; Lacas, F.; Candel, Sébastien

doi:10.1016/j.combustflame.2005.07.017

Cited by 46 publications

(34 citation statements)

References 17 publications

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“…The presence of the lateral recess is expected to favor the development of a recirculation zone that will in §uence the §ame aperture angle. Despite some progress made in this direction (see, for instance, [7] or [8,38]), the issue associated with the development of a complete model capable of describing the two-phase §ow combustion from the initial primary atomization towards the subsequent vaporization and combustion processes still remains far from being answered. In particular, the complicated problem associated with Figure 2 Geometry of the conical core and positions of injectors as modeled in [39] the modeling of primary atomization is not addressed by the present work, and, as a result, realistic LOx droplet sizes and velocities must be prescribed at the inlet.…”

Section: Computational Modelmentioning

confidence: 99%

“…Exchange terms are included to describe the transfer of mass, momentum, and energy between the two phases. Such Eulerian frameworks have been found very useful to describe primary atomization [8] or combustion in dense sprays (see, for instance, [7,8]). It must be explicitly stated that the focus of the present study will not be placed on such challenging issues associated to the description of the primary atomization itself.…”

Section: Description Of Turbulent Two-phase Flowsmentioning

confidence: 99%

“…Despite recent developments towards the use of Eulerian descriptions for dense spray combustion (see, for instance, [7,8]), standard Statistical Eulerian Lagrangian (SEL) frameworks still remain the most classical way to tackle turbulent spray combustion, and such a kind of Lagrangian description is also retained for the purpose of the present study. Provided that the level of dilution is su©ciently large, the essential advantage of retaining such a Lagrangian point of view for the liquid phase is to depict most of the phenomena related to each liquid droplet (drag, vaporization, heating, etc.)…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lagrangian modeling of turbulent spray combustion: application to rocket engines cryogenic conditions

Izard

Mura

2011

Progress in Propulsion Physics

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The present work is concerned with the application of a turbulent two-phase §ow combustion model to a spray §ame of Liquid Oxygen (LOx) and Gaseous Hydrogen (GH 2 ). The proposed strategy relies on a joint Eulerian Lagrangian framework. The Probability Density Function (PDF) that characterizes the liquid phase is evaluated by simulating the Williams spray equation [1] thanks to the semi §uid approach introduced in [2]. The Lagrangian approach provides the classical exchange terms with the gaseous phase and, especially, several vaporization source terms. They are required to describe turbulent combustion but di©cult to evaluate from the Eulerian point of view. The turbulent combustion model retained here relies on the consideration of the mixture fraction to evaluate the local fuel-to-oxidizer ratio, and the oxygen mass fraction to follow the deviations from chemical equilibrium. The di©culty associated with the estimation of a joint scalar PDF is circumvented by invoking the sudden chemistry hypothesis [3]. In this manner, the problem reduces to the estimation of the mixture fraction PDF, but with the in §uence of the terms related to vaporization that are the source of additional §uctuations of composition. Following the early proposal of [4], these terms are easily obtained from the Lagrangian framework adopted to describe the two-phase §ows. The resulting computational model is applied to the numerical simulation of LOx GH 2 spray §ames. The test case (Mascotte) is representative of combustion in rocket engine conditions. The results of numerical simulations display a satisfactory agreement with available experimental data.

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Section: Computational Modelmentioning

confidence: 99%

Section: Description Of Turbulent Two-phase Flowsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lagrangian modeling of turbulent spray combustion: application to rocket engines cryogenic conditions

Izard

Mura

2011

Progress in Propulsion Physics

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“…As a result, numerical simulation with detailed chemistry and transport properties is not practical in the near term, and a means of reducing the computational load is required, such as flame modeling. Some approaches have been proposed and applied to the injector combustion flows, in Reynoldsaveraged Navier-Stokes (RANS) 9,10) and large eddy simulation (LES) 11,12) contexts, and have obtained a certain level of success.…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional H2/O2 Counterflow Diffusion Flame Simulation for Flamelet Table Construction at Supercritical Pressure

Mizobuchi

Hirakawa

2013

Trans. Japan Soc. Aero. S Sci.

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Supercritical fluid properties are implemented in a one-dimensional counterflow flame simulation code using the Soave-Redlich-Kwong equation of state and modifying the transport properties for high-pressure, low-temperature conditions. Examination of a GH 2 /LOX diffusion flame at supercritical pressure reveals an extremely fine structure at the edge of the oxygen diffusion layer, indicating that a DNS-like approach to simulation of such flames is not practical in the near term, and flame modeling must be used. To investigate flamelet table construction, we compare simulations that use supercritical fluid and standard temperature and pressure (STP) gas properties. Both types of simulations are shown to produce almost identical flame structures when we parameterize the flame with the scalar dissipation rate at its stoichiometric position. The results show that the use of STP gas property simulation is expected to be an effective means of greatly reducing the computational cost of constructing flamelet tables at supercritical pressures.

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“…The literature pertaining specifically to Eulerian/Eulerian multiphase spray modeling appears to be much more limited. Representative examples are the papers by Fox et al [1], Vallet et al [5], Sero-Guillaume and Rimbert [6], Jay et al [7], Deux and Sommerfeld [8], Demoulin et al [9], and Moukalled and Darwish [10]. All but the first (which employs a low volume fraction multiphase model) and last (which uses a multiple size group model) of these are based on mixture models.…”

Section: Introductionmentioning

confidence: 99%

Eulerian Multiphase Population Balance Model of Atomizing, Swirling Flows

Rayapati

Panchagnula

Peddieson

et al. 2011

International Journal of Spray and Combustion Dynamics

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An Eulerian/Eulerian multiphase flow model coupled with a population balance model is used as the basis for numerical simulation of atomization in swirling flows. The objective of this exercise is to develop a methodology capable of predicting the local point-wise drop size distribution in a spray, such as would be measured by the Phase Doppler Particle Analyzer (PDA). Model predictions are compared to experimental measurements of particle size distributions in an airblast atomizer spray to demonstrate good qualitative and quantitative agreement. It is observed that the dependence of velocity on drop size inherent in a multiphase description of the drop cloud appears necessary to capture some features of the experimental data. Using this model, we demonstrate the relative contributions of secondary atomization and transport to the variation observed in the downstream spray drop size distribution.

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Combined surface density concepts for dense spray combustion

Cited by 46 publications

References 17 publications

Lagrangian modeling of turbulent spray combustion: application to rocket engines cryogenic conditions

Lagrangian modeling of turbulent spray combustion: application to rocket engines cryogenic conditions

One-Dimensional H2/O2 Counterflow Diffusion Flame Simulation for Flamelet Table Construction at Supercritical Pressure

Eulerian Multiphase Population Balance Model of Atomizing, Swirling Flows

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