Long-Term Demonstration of a Lean, Premixed, Prevaporized (LPP) System for Gas Turbines

Eskin, Leo D.; Holton, Maclain M.; Turner, Brent A.; Joklik, R.; Klassen, Michael S.; Roby, Richard J.

doi:10.1115/icone20-power2012-54766

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…The latter is achieved through the onset of a central toroidal recirculation zone, induced by either a bubble-type or regular conical vortex breakdown (VB). 34,35 The aerodynamic flame stabilization overcomes the critical issue of combustion instability in lean premixed pre-vaporized (LPP) combustors, 39,40 as a result of being operated in the proximity of the lean blowout (LBO) limit. 41,42 A prototypical configuration of an acetone/ air spray swirling jet exiting an abrupt expansion is investigated here.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty quantification analysis of Reynolds-averaged Navier–Stokes simulation of spray swirling jets undergoing vortex breakdown

Liberatori

Galassi

Valorani

et al. 2023

International Journal of Spray and Combustion Dynamics

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The computational fluid dynamics-based design of next-generation aeronautical combustion chambers is challenging due to many geometrical and operational parameters to be optimized and several sources of uncertainty that arise from numerical modeling. The present work highlights the potential benefits of exploiting Bayesian uncertainty quantification at the preliminary design stage. A prototypical configuration of an acetone/air spray swirling jet is investigated through an Eulerian–Lagrangian method under non-reactive conditions. Two direct numerical simulations (DNSs) provide reference data, coping with different vortex breakdown states. Consequently, a set of Reynolds-averaged Navier–Stokes simulations is conducted. Polynomial chaos expansion (PCE) is adopted to propagate the uncertainty associated with the spray dispersion model and the turbulent Schmidt number, delivering confidence intervals and the sensitivity of the output variance to each uncertain input. Consequently, the most significant sources of modeling uncertainty may be identified and eventually removed via a calibration procedure, thus making it possible to carry out a combustion chamber optimization process that is no longer affected by numerical biases. The uncertainty quantification analysis in the current study demonstrates that the spray dispersion model slightly affects the fuel vapor spatial distribution under vortex breakdown flow conditions, compared with the output variance induced by the selection of the turbulent Schmidt number. As a result, additional high-fidelity experimental and numerical campaigns should exclusively address the development of an ad hoc model characterizing the spatial distribution of the latter in the presence of vortex breakdown phenomenology, discarding any effort to improve the spray dispersion formulation.

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Section: Introductionmentioning

confidence: 99%

Uncertainty quantification analysis of Reynolds-averaged Navier–Stokes simulation of spray swirling jets undergoing vortex breakdown

Liberatori

Galassi

Valorani

et al. 2023

International Journal of Spray and Combustion Dynamics

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Spray and vaporization enhancement of liquid fuel with the assist of porous media and heating

Zhu

Yang

Yao

et al. 2023

Applied Thermal Engineering

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A Numerical Study of Ethanol–Water Droplet Evaporation

Lupo

Duwig

2017

Journal of Engineering for Gas Turbines and Power

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The present effort focuses on detailed numerical modeling of the evaporation of an ethanol–water droplet. The model intends to capture all relevant details of the process: it includes species and heat transport in the liquid and gas phases, and detailed thermophysical and transport properties, varying with both temperature and composition. Special attention is reserved to the composition range near and below the ethanol/water azeotrope point at ambient pressure. For this case, a significant fraction of the droplet lifetime exhibits evaporation dynamics similar to those of a pure droplet. The results are analyzed, and model simplifications are examined. In particular, the assumptions of constant liquid properties, homogeneous liquid phase composition and no differential volatility may not be valid depending on the initial droplet temperature.

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Long-Term Demonstration of a Lean, Premixed, Prevaporized (LPP) System for Gas Turbines

Cited by 4 publications

References 9 publications

Uncertainty quantification analysis of Reynolds-averaged Navier–Stokes simulation of spray swirling jets undergoing vortex breakdown

Uncertainty quantification analysis of Reynolds-averaged Navier–Stokes simulation of spray swirling jets undergoing vortex breakdown

Spray and vaporization enhancement of liquid fuel with the assist of porous media and heating

A Numerical Study of Ethanol–Water Droplet Evaporation

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