Effect of azimuthal flow fluctuations on flow and flame dynamics of axisymmetric swirling flames

Acharya, Vishal; Lieuwen, Timothy

doi:10.1063/1.4933135

Title: Effect of azimuthal flow fluctuations on flow and flame dynamics of axisymmetric swirling flames

Abstract

We report recent studies have clearly shown the important role of swirl fluctuations (or, more precisely, fluctuations in axial vorticity) in the response of premixed flames to flow oscillations. An important implication of this mechanism is that the axial location of the swirler plays a key role in the phase between the acoustic flow excitation source and the resulting axial vorticity fluctuation at the flame. Similar to the previously well recognized role of azimuthal vorticity fluctuations, these swirl fluctuations are vortical and convect at the mean flow velocity, unlike the acoustic flow fluctuations. However, there is a fundamental difference between axial and azimuthal vorticity disturbances in terms of the flow oscillations they induce on the flame. Specifically, azimuthal vorticity disturbances excite radial and axial flow disturbances, while axial vorticity oscillations, in general induce both radial and azimuthal flow fluctuations, but in the axisymmetric case, they only directly excite azimuthal flow fluctuations. The axial vorticity fluctuations do, however, indirectly excite axial and radial velocity fluctuations when the axial vortex tube is tilted off-axis, such as at locations of area expansion. This difference is significant because axisymmetric flames are disturbed only by the velocity component normal to it, which stem from axialmore »« less

Authors:

Acharya, Vishal ^[1]; Lieuwen, Timothy ^[1]

Georgia Inst. of Technology, Atlanta, GA (United States). School of Aerospace Engineering

Publication Date:: Fri Oct 23 00:00:00 EDT 2015

Research Org.:: Pennsylvania State Univ., University Park, PA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1469562

Alternate Identifier(s):: OSTI ID: 1224328

Grant/Contract Number:: NT0005054

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Fluids

Additional Journal Information:: Journal Volume: 27; Journal Issue: 10; Journal ID: ISSN 1070-6631

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 42 ENGINEERING

Citation Formats


                    Acharya, Vishal, and Lieuwen, Timothy. Effect of azimuthal flow fluctuations on flow and flame dynamics of axisymmetric swirling flames.  United States: N. p., 2015. 
Web.  doi:10.1063/1.4933135.

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                    Acharya, Vishal, & Lieuwen, Timothy. Effect of azimuthal flow fluctuations on flow and flame dynamics of axisymmetric swirling flames.  United States.  https://doi.org/10.1063/1.4933135

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                    Acharya, Vishal, and Lieuwen, Timothy. Fri .  
"Effect of azimuthal flow fluctuations on flow and flame dynamics of axisymmetric swirling flames".  United States.  https://doi.org/10.1063/1.4933135.  https://www.osti.gov/servlets/purl/1469562.

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@article{osti_1469562,

  title        = {Effect of azimuthal flow fluctuations on flow and flame dynamics of axisymmetric swirling flames},

  author       = {Acharya, Vishal and Lieuwen, Timothy},

  abstractNote = {We report recent studies have clearly shown the important role of swirl fluctuations (or, more precisely, fluctuations in axial vorticity) in the response of premixed flames to flow oscillations. An important implication of this mechanism is that the axial location of the swirler plays a key role in the phase between the acoustic flow excitation source and the resulting axial vorticity fluctuation at the flame. Similar to the previously well recognized role of azimuthal vorticity fluctuations, these swirl fluctuations are vortical and convect at the mean flow velocity, unlike the acoustic flow fluctuations. However, there is a fundamental difference between axial and azimuthal vorticity disturbances in terms of the flow oscillations they induce on the flame. Specifically, azimuthal vorticity disturbances excite radial and axial flow disturbances, while axial vorticity oscillations, in general induce both radial and azimuthal flow fluctuations, but in the axisymmetric case, they only directly excite azimuthal flow fluctuations. The axial vorticity fluctuations do, however, indirectly excite axial and radial velocity fluctuations when the axial vortex tube is tilted off-axis, such as at locations of area expansion. This difference is significant because axisymmetric flames are disturbed only by the velocity component normal to it, which stem from axial and radial velocity components only. This implies that axisymmetric mean flames are not directly affected by azimuthal flow fluctuations, since they are tangential to it. Thus, it is the extent to which the axial vorticity is tilted and rotated that controls the strength of the flow oscillations normal to the flame and, in turn, lead to heat release oscillations. This coupling process is not easily amenable to analytical calculations and, as such, we report here a computational study of the role of these different flow fluctuations on the flame response in an axisymmetric framework. In conclusion, the results indicate that the swirl fluctuations can act as significant source of flame heat release disturbances, due to azimuthal and radial vortex tubes tilting in mixing passage boundary layers and at the expansion into the combustor.},

  doi          = {10.1063/1.4933135},

  journal      = {Physics of Fluids},

  number       = 10,

  volume       = 27,

  place        = {United States},

  year         = {Fri Oct 23 00:00:00 EDT 2015},

  month        = {Fri Oct 23 00:00:00 EDT 2015}

}

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Treleaven, Nicholas C. W.; Su, Jialin; Garmory, Andrew
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Transient and limit cycle combustion dynamics analysis of turbulent premixed swirling flames
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Palies, Paul; Ilak, Milos; Cheng, Robert
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An experimental study on the effect of swirl number on pollutant formation in propane bluff-body stabilized swirl diffusion flames
journal, May 2019

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Title: Effect of azimuthal flow fluctuations on flow and flame dynamics of axisymmetric swirling flames

Abstract

Citation Formats

Dynamics of Laminar Premixed Flames Forced by Harmonic Velocity Disturbances journal, November 2008

Numerical simulation of a precessing vortex breakdown journal, April 2006

Combustion Dynamics and Instabilities: Elementary Coupling and Driving Mechanisms journal, September 2003

Flow forcing techniques for numerical simulation of combustion instabilities journal, December 2002

The Ghost Fluid Method for Deflagration and Detonation Discontinuities journal, September 1999

A kinematic model of a ducted flame journal, September 1999

Impact of Swirl Fluctuations on the Flame Response of a Perfectly Premixed Swirl Burner journal, March 2010

A Boundary Condition Capturing Method for Incompressible Flame Discontinuities journal, September 2001

Acoustic–convective mode conversion in an aerofoil cascade journal, February 2011

Characterizing energy growth during combustion instabilities: Singularvalues or eigenvalues? journal, January 2009

Characterization of acoustically forced swirl flame dynamics journal, January 2009

Combustion dynamics of a low-swirl combustor journal, November 2007

Comparison of the Flow Field of a Swirl Stabilized Premixed Burner in an Annular and a Single Burner Combustion Chamber journal, April 2010

Modeling of premixed swirling flames transfer functions journal, January 2011

Experimental investigation of the nonlinear response of turbulent premixed flames to imposed inlet velocity oscillations journal, October 2005

A review of oscillation mechanisms and the role of the precessing vortex core (PVC) in swirl combustion systems journal, January 2006

Unsteady flow evolution in swirl injector with radial entry. I. Stationary conditions journal, April 2005

Sensitivity of swirling flows to small changes in the swirler geometry journal, January 2013

Unsteady flow evolution in swirl injectors with radial entry. II. External excitations journal, April 2005

Vortex-driven acoustically coupled combustion instabilities journal, April 1987

Response of a laminar premixed flame to flow oscillations: A kinematic model and thermoacoustic instability results journal, September 1996

Experimental investigation of thermoacoustic coupling using blended hydrogen–methane fuels in a low swirl burner journal, January 2010

Investigation of the nonlinear response of turbulent premixed flames to imposed inlet velocity oscillations journal, August 2006

Influence of the Swirler Design on the Flame Transfer Function of Premixed Flames conference, November 2008

Swirl control of combustion instabilities in a gas turbine combustor journal, January 2002

A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows journal, October 1972

Theoretical and experimental determinations of the transfer function of a laminar premixed flame journal, January 2000

An analysis of unstable combustion of premixed gases journal, January 1957

Large eddy simulation of turbulent premixed flames using level-set G-equation journal, January 2005

Low-Frequency Combustion Oscillations in a Swirl Burner/Furnace journal, January 2006

A unified model for the prediction of laminar flame transfer functions journal, July 2003

Assessment of the Performances of RANS Models for Simulating Swirling Flows in a Can-Combustor journal, March 2008

Flame transfer function saturation mechanisms in a swirl-stabilized combustor journal, January 2007

Shear flow-driven combustion instability: Evidence, simulation, and modeling journal, January 2002

Experimental Study on the Effect of Swirler Geometry and Swirl Number on Flame Describing Functions journal, April 2011

Flame dynamics of a variable swirl number system and instability control journal, September 2013

A ghost-fluid method for large-eddy simulations of premixed combustion in complex geometries journal, February 2007

Large-scale structure in the mixing layer of a round jet journal, December 1978

Effect of Axial Swirl Vane Location on Combustion Dynamics conference, December 2014

A Non-oscillatory Eulerian Approach to Interfaces in Multimaterial Flows (the Ghost Fluid Method) journal, July 1999

Combustion Instabilities In Gas Turbine Engines book, January 2006

The Interaction of Entropy Fluctuations with Turbine Blade Rows; A Mechanism of Turbojet Engine Noise journal, November 1977

Coherent structures in unsteady swirling jet flow journal, November 2005

Measurement of equivalence ratio fluctuation and its effect on heat release during unstable combustion journal, January 2000

On the identification of helical instabilities in a reacting swirling flow journal, August 2008

Combustion instability related to vortex shedding in dump combustors and their passive control journal, January 1992

Modelling the pressure–strain correlation of turbulence: an invariant dynamical systems approach journal, June 1991

Large-eddy simulations of gas-turbine swirl injector flow dynamics journal, July 2007

Premixed Flames Excited by Helical Disturbances: Flame Wrinkling and Heat Release Oscillations journal, November 2013

Impact of Swirl Fluctuations on the Flame Response of a Perfectly Premixed Swirl Burner conference, February 2010

Unsteady Combustor Physics journal, April 2014

Low-frequency Combustion Oscillations in a Swirl Burner/furnace conference, June 2004

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Transient and limit cycle combustion dynamics analysis of turbulent premixed swirling flames journal, October 2017

An experimental study on the effect of swirl number on pollutant formation in propane bluff-body stabilized swirl diffusion flames journal, May 2019

Dynamics of Laminar Premixed Flames Forced by Harmonic Velocity Disturbances
journal, November 2008

Numerical simulation of a precessing vortex breakdown
journal, April 2006

Combustion Dynamics and Instabilities: Elementary Coupling and Driving Mechanisms
journal, September 2003

Flow forcing techniques for numerical simulation of combustion instabilities
journal, December 2002

The Ghost Fluid Method for Deflagration and Detonation Discontinuities
journal, September 1999

A kinematic model of a ducted flame
journal, September 1999

Impact of Swirl Fluctuations on the Flame Response of a Perfectly Premixed Swirl Burner
journal, March 2010

A Boundary Condition Capturing Method for Incompressible Flame Discontinuities
journal, September 2001

Acoustic–convective mode conversion in an aerofoil cascade
journal, February 2011

Characterizing energy growth during combustion instabilities: Singularvalues or eigenvalues?
journal, January 2009

Characterization of acoustically forced swirl flame dynamics
journal, January 2009

Combustion dynamics of a low-swirl combustor
journal, November 2007

Comparison of the Flow Field of a Swirl Stabilized Premixed Burner in an Annular and a Single Burner Combustion Chamber
journal, April 2010

Modeling of premixed swirling flames transfer functions
journal, January 2011

Experimental investigation of the nonlinear response of turbulent premixed flames to imposed inlet velocity oscillations
journal, October 2005

A review of oscillation mechanisms and the role of the precessing vortex core (PVC) in swirl combustion systems
journal, January 2006

Unsteady flow evolution in swirl injector with radial entry. I. Stationary conditions
journal, April 2005

Sensitivity of swirling flows to small changes in the swirler geometry
journal, January 2013

Unsteady flow evolution in swirl injectors with radial entry. II. External excitations
journal, April 2005

Vortex-driven acoustically coupled combustion instabilities
journal, April 1987

Response of a laminar premixed flame to flow oscillations: A kinematic model and thermoacoustic instability results
journal, September 1996

Experimental investigation of thermoacoustic coupling using blended hydrogen–methane fuels in a low swirl burner
journal, January 2010

Investigation of the nonlinear response of turbulent premixed flames to imposed inlet velocity oscillations
journal, August 2006

Influence of the Swirler Design on the Flame Transfer Function of Premixed Flames
conference, November 2008

Swirl control of combustion instabilities in a gas turbine combustor
journal, January 2002

A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows
journal, October 1972

Theoretical and experimental determinations of the transfer function of a laminar premixed flame
journal, January 2000

An analysis of unstable combustion of premixed gases
journal, January 1957

Large eddy simulation of turbulent premixed flames using level-set G-equation
journal, January 2005

Low-Frequency Combustion Oscillations in a Swirl Burner/Furnace
journal, January 2006

A unified model for the prediction of laminar flame transfer functions
journal, July 2003

Assessment of the Performances of RANS Models for Simulating Swirling Flows in a Can-Combustor
journal, March 2008

Flame transfer function saturation mechanisms in a swirl-stabilized combustor
journal, January 2007

Shear flow-driven combustion instability: Evidence, simulation, and modeling
journal, January 2002

Experimental Study on the Effect of Swirler Geometry and Swirl Number on Flame Describing Functions
journal, April 2011

Flame dynamics of a variable swirl number system and instability control
journal, September 2013

A ghost-fluid method for large-eddy simulations of premixed combustion in complex geometries
journal, February 2007

Large-scale structure in the mixing layer of a round jet
journal, December 1978

Effect of Axial Swirl Vane Location on Combustion Dynamics
conference, December 2014

A Non-oscillatory Eulerian Approach to Interfaces in Multimaterial Flows (the Ghost Fluid Method)
journal, July 1999

Combustion Instabilities In Gas Turbine Engines
book, January 2006

The Interaction of Entropy Fluctuations with Turbine Blade Rows; A Mechanism of Turbojet Engine Noise
journal, November 1977

Coherent structures in unsteady swirling jet flow
journal, November 2005

Measurement of equivalence ratio fluctuation and its effect on heat release during unstable combustion
journal, January 2000

On the identification of helical instabilities in a reacting swirling flow
journal, August 2008

Combustion instability related to vortex shedding in dump combustors and their passive control
journal, January 1992

Modelling the pressure–strain correlation of turbulence: an invariant dynamical systems approach
journal, June 1991

Large-eddy simulations of gas-turbine swirl injector flow dynamics
journal, July 2007

Premixed Flames Excited by Helical Disturbances: Flame Wrinkling and Heat Release Oscillations
journal, November 2013

Impact of Swirl Fluctuations on the Flame Response of a Perfectly Premixed Swirl Burner
conference, February 2010

Unsteady Combustor Physics
journal, April 2014

Low-frequency Combustion Oscillations in a Swirl Burner/furnace
conference, June 2004

An Efficient Method to Reproduce the Effects of Acoustic Forcing on Gas Turbine Fuel Injectors in Incompressible Simulations
journal, March 2019

Transient and limit cycle combustion dynamics analysis of turbulent premixed swirling flames
journal, October 2017

An experimental study on the effect of swirl number on pollutant formation in propane bluff-body stabilized swirl diffusion flames
journal, May 2019