Large eddy simulation of fuel sensitivity in a realistic spray combustor II. Lean blowout analysis

Panchal, Achyut; Menon, Suresh

doi:10.1016/j.combustflame.2022.112161

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…A more detailed analysis of specific reaction rates in the LES will therefore be carried out in a subsequent study. Reviewing the results presented thus far, we can conclude that both the thermodynamic properties of different jet fuels as well as their gas-phase kinetics play a significant role in determining the spray and flame structure in an aeroengine, as has been previously observed experimentally [78] and numerically [30][31][32]. The liquid properties primarily affect the vaporization rate, which in turn affects flame stabilization.…”

Section: Spray Combustion Resultssupporting

confidence: 63%

“…Another key difference is that it was operated at much lower equivalence ratios, close to lean blow-out. The same rig was studied numerically by Esclapez et al [30] and Panchal and Menon [31,32] for the same set of fuels. There are remarkable similarities between the results of Mayhew [78] and the present work.…”

Section: Spray Combustion Resultsmentioning

confidence: 99%

“…At the present time, C1 and C5 are also the only category C fuels for which CFD-relevant skeletal reaction mechanisms exist [23,24]. Although not as numerous as studies targeting the well-established Jet A and JP-5, numerical studies targeting C1 and C5 have been carried out across a range of conditions [29][30][31][32][33][34][35][36].…”

Section: Targeted Jet Fuelsmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Modeling of Chemical Kinetics, Spray Dynamics, and Turbulent Combustion towards Sustainable Aviation

Åkerblom,

Passad,

Ercole

et al. 2023

Aerospace

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With growing interest in sustainable civil supersonic and hypersonic aviation, there is a need to model the combustion of alternative, sustainable jet fuels. This work presents numerical simulations of several related phenomena, including laminar flames, ignition, and spray flames. Two conventional jet fuels, Jet A and JP-5, and two alternative jet fuels, C1 and C5, are targeted. The laminar burning velocities of these fuels are predicted using skeletal and detailed reaction mechanisms. The ignition delay times are predicted in the context of dual-mode ramjet engines. Large Eddy Simulations (LES) of spray combustion in an aeroengine are carried out to investigate how the different thermodynamic and chemical properties of alternative fuels lead to different emergent behavior. A novel set of thermodynamic correlations are developed for the spray model. The laminar burning velocity predictions are normalized by heat of combustion to reveal a more distinct fuel trend, with C1 burning slowest and C5 fastest. The ignition results highlight the contributions of the Negative Temperature Coefficient (NTC) effect, equivalence ratio, and hydrogen enrichment in determining ignition time scales in dual-mode ramjet engines. The spray results reveal that the volatile alternative jet fuels have short penetration depths and that the flame of the most chemically divergent fuel (C1) stabilizes relatively close to the spray.

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Section: Spray Combustion Resultssupporting

confidence: 63%

Section: Spray Combustion Resultsmentioning

confidence: 99%

Section: Targeted Jet Fuelsmentioning

confidence: 99%

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Numerical Modeling of Chemical Kinetics, Spray Dynamics, and Turbulent Combustion towards Sustainable Aviation

Åkerblom,

Passad,

Ercole

et al. 2023

Aerospace

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On the robustness and accuracy of large-eddy simulation in predicting complex internal flow of a gas-turbine combustor

et al. 2023

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The objective of this study is to evaluate the effects of numerical and model setups on the large-eddy simulation (LES) predictive capability for the internal flow of a propulsion-relevant configuration. The specific focus is placed on assessing the LES technique with lower mesh resolutions, which is of technological relevance to practical industrial design. A set of Riemann flux formulations and commonly used subgrid-scale models are considered in this work to produce a hierarchy of LES setups with different dissipation effects (both numerically and physically). The LES results obtained from different setups are compared qualitatively in terms of the key flow characteristics and evaluated quantitatively against the experimental measurements. The error landscape is generated to reveal the predictive qualities of different LES setups. The study shows that the choice of numerical flux formulation plays a prominent role in governing the general flow patterns, while the effect of subgrid-scale model is mainly manifested in transient flow characteristics, such as vortex breakdown and swirl-induced vortical structures. Based on the error analysis, it is found that lower dissipative LES setup is not always beneficial to the LES accuracy. This is in contrast to the commonly accepted understanding in literature for the LES, which was established solely with canonical flow configurations.

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Large eddy simulation of combustion noise in a realistic gas turbine combustor

Panchal

Menon

2023

AIAA SCITECH 2023 Forum

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Large eddy simulation of fuel sensitivity in a realistic spray combustor II. Lean blowout analysis

Cited by 3 publications

References 25 publications

Numerical Modeling of Chemical Kinetics, Spray Dynamics, and Turbulent Combustion towards Sustainable Aviation

Numerical Modeling of Chemical Kinetics, Spray Dynamics, and Turbulent Combustion towards Sustainable Aviation

On the robustness and accuracy of large-eddy simulation in predicting complex internal flow of a gas-turbine combustor

Large eddy simulation of combustion noise in a realistic gas turbine combustor

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