Vortex breakdown in swirling Burke–Schumann flames

Keeton, Benjamin W.; Nomura, Keiko; Sánchez, Antonio L.; Williams, Forman A.

doi:10.1016/j.proci.2022.07.013

Proceedings of the Combustion Institute

2023

DOI: 10.1016/j.proci.2022.07.013

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Vortex breakdown in swirling Burke–Schumann flames

Benjamin W. Keeton

Keiko Nomura

Antonio L. Sánchez

et al.

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Cited by 3 publications

References 22 publications

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A balanced outflow boundary condition for swirling flows

Douglas

2024

Theor. Comput. Fluid Dyn.

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In open flow simulations, the dispersion characteristics of disturbances near synthetic boundaries can lead to unphysical boundary scattering interactions that contaminate the resolved flow upstream by propagating numerical artifacts back into the domain interior. This issue is exacerbated in flows influenced by real or apparent body forces, which can significantly disrupt the normal stress balance along outflow boundaries and generate spurious pressure disturbances. To address this problem, this paper develops a zero-parameter, physics-based outflow boundary condition (BC) designed to minimize pressure scattering from body forces and pseudo-forces and enhance transparency of the artificial boundary. This “balanced outflow BC” is then compared against other common BCs from the literature using example axisymmetric and three-dimensional open swirling flow computations. Due to centrifugal and Coriolis forces, swirling flows are known to be particularly challenging to simulate in open geometries, as these apparent forces induce non-trivial hydrostatic stress distributions along artificial boundaries that cause scattering issues. In this context, the balanced outflow BC is shown to correspond to a geostrophic hydrostatic stress correction that balances the induced pressure gradients. Unlike the alternatives, the balanced outflow BC yields accurate results in truncated domains for both linear and nonlinear computations without requiring assumptions about wave characteristics along the boundary.

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A balanced outflow boundary condition for swirling flows

Douglas

2024

Theor. Comput. Fluid Dyn.

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A computational investigation of swirl-number and Damköhler-number effects on non-premixed laminar swirling jet flames

Keeton,

Nomura,

Sánchez

et al. 2023

Combustion and Flame

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Intermittency of Flame Structure and Thermo-Acoustic Behavior in a Staged Multipoint Injector Using Liquid Fuel

Truffot,

Renaud,

Zimmer

et al. 2023

Journal of Engineering for Gas Turbines and Power

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This study investigates the impact of the staging factor, the ratio between the fuel injected through the pilot stage and the multipoint injection, on the flame dynamic. The BIMER combustor is an atmospheric pressure rig equipped with two co-rotating swirling air injections (a fixed amount of around 87% of the air goes inside the multipoint stage) and two fuel injection paths for staged combustion. Liquid dodecane is injected with air preheated at 437K with a global equivalence ratio of 0.6 and a thermal power around 72 kW. The change of the staging factor from 100% (pilot-only injection) toward 0% (multipoint-only injection) generates changes in the flame-shape which bifurcates from an anchored V-flame into a lifted flame. This flame shape bifurcation appears at a staging factor around 25%. Around this staging factor, one can witness multistable flames where the flame structure transits randomly between five different states. Processing microphone signals recorded in the chamber provides an understanding of the flame dynamics. The attached flame presents limited pressure fluctuations level at 270 Hz, while the lifted flame features high-pressure fluctuations at 323 Hz. The intermittency between the five states (including the two stable states) is investigated.

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Vortex breakdown in swirling Burke–Schumann flames

Cited by 3 publications

References 22 publications

A balanced outflow boundary condition for swirling flows

A balanced outflow boundary condition for swirling flows

A computational investigation of swirl-number and Damköhler-number effects on non-premixed laminar swirling jet flames

Intermittency of Flame Structure and Thermo-Acoustic Behavior in a Staged Multipoint Injector Using Liquid Fuel

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