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Large-eddy simulations of unsteady hydrogen annular flames

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Large-eddy simulations of unsteady hydrogen annular flames. / Mira Martinez, Daniel; Jiang, Xi.
In: Computers and Fluids, Vol. 80, 10.07.2013, p. 429–440.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Mira Martinez, D & Jiang, X 2013, 'Large-eddy simulations of unsteady hydrogen annular flames', Computers and Fluids, vol. 80, pp. 429–440. https://doi.org/10.1016/j.compfluid.2012.01.013

APA

Mira Martinez, D., & Jiang, X. (2013). Large-eddy simulations of unsteady hydrogen annular flames. Computers and Fluids, 80, 429–440. https://doi.org/10.1016/j.compfluid.2012.01.013

Vancouver

Mira Martinez D, Jiang X. Large-eddy simulations of unsteady hydrogen annular flames. Computers and Fluids. 2013 Jul 10;80:429–440. Epub 2012 Jan 30. doi: 10.1016/j.compfluid.2012.01.013

Author

Mira Martinez, Daniel ; Jiang, Xi. / Large-eddy simulations of unsteady hydrogen annular flames. In: Computers and Fluids. 2013 ; Vol. 80. pp. 429–440.

Bibtex

@article{2e23aba7cd934feb9601999657a2cb11,
title = "Large-eddy simulations of unsteady hydrogen annular flames",
abstract = "Large-eddy simulation (LES) of three-dimensional non-premixed hydrogen flames in a confined annular configuration has been conducted in order to clarify the interactions between different instabilities and swirling motion in the reacting jet flow field. The LES approach in parallel implementation follows a dynamic k − Δ subgrid-scale (SGS) model in which the SGS stress is modelled by the eddy viscosity hypothesis using the sub-grid scale turbulent kinetic energy. The results show a geometric central recirculation zone because of the bluff body configuration and a near-wall recirculation region for all the cases considered. The swirling flames also developed a toroidal recirculation zone with a collar-like shear structure around it that ended up in a vortex-breakdown bubble (VBB) for the case of moderate swirl number. As the degree of swirl was increased, the VBB increased in size and strengthened up to create a large central recirculation zone. It was shown that these regions with flow reversal enhance the air and fuel mixing and thus, improve the entire combustion process.",
keywords = "Large-eddy simulation, Swirl , Recirculation zone , Buoyancy",
author = "{Mira Martinez}, Daniel and Xi Jiang",
year = "2013",
month = jul,
day = "10",
doi = "10.1016/j.compfluid.2012.01.013",
language = "English",
volume = "80",
pages = "429–440",
journal = "Computers and Fluids",
issn = "0045-7930",
publisher = "Elsevier Limited",

}

RIS

TY - JOUR

T1 - Large-eddy simulations of unsteady hydrogen annular flames

AU - Mira Martinez, Daniel

AU - Jiang, Xi

PY - 2013/7/10

Y1 - 2013/7/10

N2 - Large-eddy simulation (LES) of three-dimensional non-premixed hydrogen flames in a confined annular configuration has been conducted in order to clarify the interactions between different instabilities and swirling motion in the reacting jet flow field. The LES approach in parallel implementation follows a dynamic k − Δ subgrid-scale (SGS) model in which the SGS stress is modelled by the eddy viscosity hypothesis using the sub-grid scale turbulent kinetic energy. The results show a geometric central recirculation zone because of the bluff body configuration and a near-wall recirculation region for all the cases considered. The swirling flames also developed a toroidal recirculation zone with a collar-like shear structure around it that ended up in a vortex-breakdown bubble (VBB) for the case of moderate swirl number. As the degree of swirl was increased, the VBB increased in size and strengthened up to create a large central recirculation zone. It was shown that these regions with flow reversal enhance the air and fuel mixing and thus, improve the entire combustion process.

AB - Large-eddy simulation (LES) of three-dimensional non-premixed hydrogen flames in a confined annular configuration has been conducted in order to clarify the interactions between different instabilities and swirling motion in the reacting jet flow field. The LES approach in parallel implementation follows a dynamic k − Δ subgrid-scale (SGS) model in which the SGS stress is modelled by the eddy viscosity hypothesis using the sub-grid scale turbulent kinetic energy. The results show a geometric central recirculation zone because of the bluff body configuration and a near-wall recirculation region for all the cases considered. The swirling flames also developed a toroidal recirculation zone with a collar-like shear structure around it that ended up in a vortex-breakdown bubble (VBB) for the case of moderate swirl number. As the degree of swirl was increased, the VBB increased in size and strengthened up to create a large central recirculation zone. It was shown that these regions with flow reversal enhance the air and fuel mixing and thus, improve the entire combustion process.

KW - Large-eddy simulation

KW - Swirl

KW - Recirculation zone

KW - Buoyancy

U2 - 10.1016/j.compfluid.2012.01.013

DO - 10.1016/j.compfluid.2012.01.013

M3 - Journal article

VL - 80

SP - 429

EP - 440

JO - Computers and Fluids

JF - Computers and Fluids

SN - 0045-7930

ER -