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Direct numerical simulation of the near field dynamics of a rectangular reactive plume

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Direct numerical simulation of the near field dynamics of a rectangular reactive plume. / Jiang, Xi; Luo, K H .

In: International Journal of Heat and Fluid Flow, Vol. 22, No. 6, 12.2001, p. 633-642.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Jiang, X & Luo, KH 2001, 'Direct numerical simulation of the near field dynamics of a rectangular reactive plume', International Journal of Heat and Fluid Flow, vol. 22, no. 6, pp. 633-642. https://doi.org/10.1016/S0142-727X(01)00123-0

APA

Vancouver

Jiang X, Luo KH. Direct numerical simulation of the near field dynamics of a rectangular reactive plume. International Journal of Heat and Fluid Flow. 2001 Dec;22(6):633-642. doi: 10.1016/S0142-727X(01)00123-0

Author

Jiang, Xi ; Luo, K H . / Direct numerical simulation of the near field dynamics of a rectangular reactive plume. In: International Journal of Heat and Fluid Flow. 2001 ; Vol. 22, No. 6. pp. 633-642.

Bibtex

@article{9cfcb190ea074277843c053779672b0a,
title = "Direct numerical simulation of the near field dynamics of a rectangular reactive plume",
abstract = "Spatial direct numerical simulation (DNS) is used to study the near field dynamics of a buoyant diffusion flame established on a rectangular nozzle with an aspect ratio of 2:1. Combustion is represented by a one-step finite-rate Arrhenius chemistry. Without applying external perturbations at the inflow boundary, large vortical structures develop naturally in the flow field, which interact with the flame and temporally create localized holes within the reaction zone in which no chemical reactions take place. The interaction between density gradients and gravity plays a major role in the vorticity generation of the buoyant plume. At the downstream of the reactive plume, a more disorganized flow regime characterized by small scales has been observed, following the breakdown of the large vortical structures due to three-dimensional (3D) vortex interactions. Analysis of energy spectra shows that the spatially developing reactive plume has a tendency of transition to turbulence under the effects of combustion-induced buoyancy. The buoyancy effects are found to be very important to the formation, development, interaction, and breakdown of vortices in reactive plumes. In contrast with the relaminarization effects of chemical exothermicity via viscous damping and volumetric expansion on non-buoyant jet diffusion flames, the tendency towards transition to turbulence in reactive plumes is greatly enhanced by the buoyancy effects. (C) 2001 Elsevier Science Inc. All rights reserved.",
keywords = "DNS, buoyancy, transition, combustion, non-circular jets, JET DIFFUSION FLAMES, SQUARE JETS, BOUNDARY-CONDITIONS, NONCIRCULAR JETS, BUOYANT PLUMES, THERMAL PLUME, TURBULENCE, FLOWS, COMBUSTION, TRANSITION",
author = "Xi Jiang and Luo, {K H}",
year = "2001",
month = dec,
doi = "10.1016/S0142-727X(01)00123-0",
language = "English",
volume = "22",
pages = "633--642",
journal = "International Journal of Heat and Fluid Flow",
issn = "0142-727X",
publisher = "Elsevier",
number = "6",

}

RIS

TY - JOUR

T1 - Direct numerical simulation of the near field dynamics of a rectangular reactive plume

AU - Jiang, Xi

AU - Luo, K H

PY - 2001/12

Y1 - 2001/12

N2 - Spatial direct numerical simulation (DNS) is used to study the near field dynamics of a buoyant diffusion flame established on a rectangular nozzle with an aspect ratio of 2:1. Combustion is represented by a one-step finite-rate Arrhenius chemistry. Without applying external perturbations at the inflow boundary, large vortical structures develop naturally in the flow field, which interact with the flame and temporally create localized holes within the reaction zone in which no chemical reactions take place. The interaction between density gradients and gravity plays a major role in the vorticity generation of the buoyant plume. At the downstream of the reactive plume, a more disorganized flow regime characterized by small scales has been observed, following the breakdown of the large vortical structures due to three-dimensional (3D) vortex interactions. Analysis of energy spectra shows that the spatially developing reactive plume has a tendency of transition to turbulence under the effects of combustion-induced buoyancy. The buoyancy effects are found to be very important to the formation, development, interaction, and breakdown of vortices in reactive plumes. In contrast with the relaminarization effects of chemical exothermicity via viscous damping and volumetric expansion on non-buoyant jet diffusion flames, the tendency towards transition to turbulence in reactive plumes is greatly enhanced by the buoyancy effects. (C) 2001 Elsevier Science Inc. All rights reserved.

AB - Spatial direct numerical simulation (DNS) is used to study the near field dynamics of a buoyant diffusion flame established on a rectangular nozzle with an aspect ratio of 2:1. Combustion is represented by a one-step finite-rate Arrhenius chemistry. Without applying external perturbations at the inflow boundary, large vortical structures develop naturally in the flow field, which interact with the flame and temporally create localized holes within the reaction zone in which no chemical reactions take place. The interaction between density gradients and gravity plays a major role in the vorticity generation of the buoyant plume. At the downstream of the reactive plume, a more disorganized flow regime characterized by small scales has been observed, following the breakdown of the large vortical structures due to three-dimensional (3D) vortex interactions. Analysis of energy spectra shows that the spatially developing reactive plume has a tendency of transition to turbulence under the effects of combustion-induced buoyancy. The buoyancy effects are found to be very important to the formation, development, interaction, and breakdown of vortices in reactive plumes. In contrast with the relaminarization effects of chemical exothermicity via viscous damping and volumetric expansion on non-buoyant jet diffusion flames, the tendency towards transition to turbulence in reactive plumes is greatly enhanced by the buoyancy effects. (C) 2001 Elsevier Science Inc. All rights reserved.

KW - DNS

KW - buoyancy

KW - transition

KW - combustion

KW - non-circular jets

KW - JET DIFFUSION FLAMES

KW - SQUARE JETS

KW - BOUNDARY-CONDITIONS

KW - NONCIRCULAR JETS

KW - BUOYANT PLUMES

KW - THERMAL PLUME

KW - TURBULENCE

KW - FLOWS

KW - COMBUSTION

KW - TRANSITION

U2 - 10.1016/S0142-727X(01)00123-0

DO - 10.1016/S0142-727X(01)00123-0

M3 - Journal article

VL - 22

SP - 633

EP - 642

JO - International Journal of Heat and Fluid Flow

JF - International Journal of Heat and Fluid Flow

SN - 0142-727X

IS - 6

ER -