Large Eddy Simulation of Lean Premixed Swirling Flames via Dynamically Thickened Flame Model Coupling with the REDIM Chemistry Table

He, Hongkai; Wang, P.; Xu, Liangliang; Xu, Qingyu; Jiang, Ling; Shrotriya, Prashant

doi:10.1134/s0010508220060039

Cited by 2 publications

(1 citation statement)

References 22 publications

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“…All of the aforementioned approaches have proven successful in reproducing technically premixed combustion with either methane or natural gas. LES results from tabulated chemistry approaches [11][12][13], under the assumption of perfectly premixed combustion, have also been shown to correlate well with experimental observations. More in line with the modelling approach addressed in this work, LES coupled to a multidimensional flamelet database for non-premixed combustion, relying on the tabulation of 1D premixed flame solutions at different equivalence ratios, was able to reproduce the swirl-stabilized flames from the PRECCINSTA burner operated at the atmospheric pressure test rig [14].…”

Section: Introductionsupporting

confidence: 56%

Numerical Assessment of the Effect of Hydrogen Enrichment of a Technically Premixed Swirl-Stabilized Natural Gas Flame

Pachano,

Surapaneni,

Both

et al. 2023

Volume 3A: Combustion, Fuels, and Emissions

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High-fidelity large eddy simulations (LES) are conducted for lean natural gas flames with different levels of hydrogen enrichment in a technically premixed swirl-stabilized combustor (PRECCINSTA) operated at atmospheric pressure. The modelling approach relies on tabulation of premixed flamelets and presumed-shape probability density functions (PDF) to account for subgrid turbulence-chemistry interactions. Results are presented for non-reacting and reacting conditions with 0, 40 and 50% hydrogen content in the natural gas. The influence of hydrogen-enrichment is investigated here by combining LES with Raman measurements. The assessment of LES shows good predictions of the flame stabilization mechanism, flow field and flame dynamics as compared to experiments. The natural gas flame develops a self-excited flow oscillation characterized as a precessing vortex core, which is well reproduced by the LES. The lean operation of the burner with natural gas shows a stable M-shape flame that transitions to a V-shape fully attached flame as the main fuel is blended with hydrogen. Raman measurements are compared with LES data to examine the flame structure and burning characteristics. It is concluded that hydrogen addition makes the flame more compact, induces higher reactivity of the fuel-air mixture and leads to a stable V-shape flame fully attached to the burner’s nozzle-cone.

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