Chemical modeling for methane oxy-combustion in Liquid Rocket Engines

Blanchard, S.; Cazères, Quentin; Cuenot, Bénédicte

doi:10.1016/j.actaastro.2021.09.039

Cited by 18 publications

(9 citation statements)

References 29 publications

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“…N spec k=1 ωk,expo ≠ 0. Thus a correction method 11 is added to ensure the mass conservation. One can note that ωn k,expo approaches ωn k when the time-step goes to zero in equation (3).…”

Section: Chemistry Integrationmentioning

confidence: 99%

“…To avoid the high numerical cost induced by the explicit integration of stiff ARC mechanisms, the exponential integration method 11 is used and summarized below. The species are assumed to be produced or consumed following a first-order differential equation: where the species production rates can be decomposed into A k c k and B k, the contributions to destruction and creation, respectively.…”

Section: Chemistrymentioning

confidence: 99%

“…By construction the exponential integration is not mass conservative: ∑ k = 1 N s p e c ω ˙ k , e x p o ≠ 0. Thus a correction method 11 is added to ensure the mass conservation. One can note that ω ˙ k , e x p o n approaches ω ˙ k n when the time-step goes to zero in equation (3).…”

Section: Chemistrymentioning

confidence: 99%

“…To this purpose, several numerical strategies are proposed in this study. First, chemistry is integrated with a semi-implicit exponential formulation 11 associated to a local and dynamic sub-cycling (LDSC) procedure. 12 Then a particle-bursting method (PBM) is used to spatially re-distribute the local fuel evaporation source terms inherent to the point source assumption of the Lagrangian formalism.…”

Section: Introductionmentioning

confidence: 99%

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Euler–Lagrange numerical simulation of a kerosene droplet mist ignition in air using analytically reduced chemistry

Pestre,

Lesaffre,

Cazères

et al. 2023

International Journal of Spray and Combustion Dynamics

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High altitude relight is a critical aspect of the aeronautical engine certification and may be addressed with the numerical simulation of two-phase ignition. However, such configurations are stiff and combined with local evaporation may lead to numerical issues. This paper provides several methods to perform two-phase ignition simulations using analytically reduced chemistry in the context of unstructured large Eddy simulation and Euler–Lagrange formalism. Firstly, an exponential formulation combined with a local and dynamic sub-cycling of the stiff chemistry is demonstrated to allow stable integration at the flow time step. Secondly, a particle-bursting method is applied to limit the impact of stiffness induced by the Lagrangian point-source approach in fine meshes. These methods are then applied in the simulation of ignition of a mono-disperse, multi-component kerosene spray in air. The use of the analytically reduced chemistry model enables us to describe in detail the chemical structure of the flame kernel during its formation. Moreover, local increase of fuel concentration is observed as the ignition proceeds which has a large influence on the combustion processes and the flame kernel development.

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Section: Chemistry Integrationmentioning

confidence: 99%

Section: Chemistrymentioning

confidence: 99%

Section: Chemistrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Euler–Lagrange numerical simulation of a kerosene droplet mist ignition in air using analytically reduced chemistry

Pestre,

Lesaffre,

Cazères

et al. 2023

International Journal of Spray and Combustion Dynamics

Self Cite

View full text Add to dashboard Cite

show abstract

“…2. the computation of combustion source terms introduces stiffness when fast intermediate species are considered in the flow, which can entail the use of dedicated time-integration procedures [28,73,74].…”

Section: Specificities Of Numerical Combustionmentioning

confidence: 99%