Structure of cryogenic flames at elevated pressures

Juniper, Mathew; Tripathi, Amita; Scouflaire, Philippe; Rolon, Juan-Carlos; Candel, Sébastien

doi:10.1016/s0082-0784(00)80320-3

Cited by 68 publications

(57 citation statements)

References 10 publications

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“…The obtained results can be ¦rst discussed in terms of both position and shape of the resulting §ame. From a qualitative point of view, the experiments conducted at ONERA have always shown that the §ame is attached close to the injector exit and surrounds the central spray of LOx droplets [42]. These two speci¦c features were clearly recovered by the present numerical simulations: the cryogenic §ame is attached just downstream of the injector lip that separates the GH 2 stream from the LOx core (Fig.…”

Section: Resultssupporting

confidence: 66%

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: Resultssupporting

confidence: 66%

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

Izard

Mura

2011

Progress in Propulsion Physics

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“…Under high-pressure environments in rocket engine combustors, the refraction of light at the edge of the LOX jet core will be an issue, as pointed out in Refs. [4][5][6]. In addition, the absorption coefficients of the gas medium increase substantially, and the effects of radiation absorption are not negligible for some wavelength ranges.…”

Section: Perspective For High-pressure Applications In Rocket Engine mentioning

confidence: 99%

Correlation of optical emission and turbulent length scale in a coaxial jet diffusion flame

Matsuyama

2014

Combustion and Flame

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“…Cryogenic flames were investigated on different testbeds [16][17][18][19][20][21][22]. These studies gave valuable data on the combustion processes taking place under sub-to super-critical pressures for different injection conditions.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of a transcritical coaxial flame under a high-frequency transverse acoustic forcing: Influence of the modulation frequency on the flame response

Hakim

Schmitt

Ducruix

et al. 2015

Combustion and Flame

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Structure of cryogenic flames at elevated pressures

Cited by 68 publications

References 10 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

Correlation of optical emission and turbulent length scale in a coaxial jet diffusion flame

Dynamics of a transcritical coaxial flame under a high-frequency transverse acoustic forcing: Influence of the modulation frequency on the flame response

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