Large eddy simulation of multi-regime burner: a reaction mechanism sensitivity analysis

Angelilli, Lorenzo; Ciottoli, Pietro Paolo; Pérez, Francisco E. Hernández; Valorani, Mauro; Im, Hong G.; Galassi, Riccardo Malpica

doi:10.2514/6.2022-0639

Cited by 2 publications

(2 citation statements)

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“…The accuracy and the sensitivity of the solution to the chemical kinetic model was assessed by Angelilli et al [16], where it was found that the DIMA15 mechanism [31,32] reduced through the computational singular perturbation (CSP) reduction method [33] is sufficient to capture the flame dynamics. Accordingly, the DIMA15 mechanism was used in the present study.…”

Section: Test Case Descriptionmentioning

confidence: 99%

“…Although the flow and important scalar fields were satisfactorily predicted near the nozzle exits, the prediction of the CO mass fraction and temperature showed noticeable deviations in the far field, indicating deficiencies in the modeling approach. Considering that a correct representation of the chemical source terms is critical in predicting the local extinction/re-ignition and the resulting multi-regime combustion, highly resolved LES has been attempted with a finite-rate-based chemistry closure, such as the eddy dissipation concept (EDC), reporting improved predictions compared to the experiments, though at the expense of a heavier computational burden [16].…”

Section: Introductionmentioning

confidence: 99%

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A Lagrangian analysis of combustion regimes using multi-modal turbulent combustion model

Angelilli

Ciottoli

Pérez

et al. 2023

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High Reynolds number turbulent reacting flows poses a modeling challenge due to the multi-regime, mixed-mode nature of the combustion processes. The present study attempts to provide insights into the complex combustion characteristics in turbulent flames by conducting highly resolved large eddy simulations of the Darmstadt multi-regime burner exhibiting both premixed and nonpremixed combustion regimes with occurrences of local extinction and re-ignition. Massless Lagrangian particles are transported along with the flow in order to monitor the evolution of the local flow-chemistry interaction. The simulations are validated against experimental data, and the Lagrangian properties are compared against the traditional premixed model in progress variable space and a generalized multi-modal manifold model in mixture fraction and generalized progress variable space. The comparison reveals that minor radical species are sensitive to the generalized progress variable dissipation rates, and the multi-modal manifold model is more suitable to reproduce the complex flame structure. Using the multi-modal model framework, the evolution of the combustion regimes is analyzed by the slope of the Lagrangian particle trajectory in the phase space.

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