Towards the distributed burning regime in turbulent premixed flames

Aspden, A. J.; Day, M. S.; Bell, J. B.

doi:10.1017/jfm.2019.316

Title: Towards the distributed burning regime in turbulent premixed flames

Abstract

Three-dimensional numerical simulations of canonical statistically steady, statistically planar turbulent flames have been used in an attempt to produce distributed burning in lean methane and hydrogen flames. Dilatation across the flame means that extremely large Karlovitz numbers are required; even at the extreme levels of turbulence studied (up to a Karlovitz number of 8767) distributed burning was only achieved in the hydrogen case. In this case, turbulence was found to broaden the reaction zone visually by around an order of magnitude, and thermodiffusive effects (typically present for lean hydrogen flames) were not observed. In the preheat zone, the species compositions differ considerably from those of one-dimensional flames based a number of different transport models (mixture averaged, unity Lewis number and a turbulent eddy viscosity model). The behaviour is a characteristic of turbulence dominating non-unity Lewis number species transport, and the distinct limit is again attributed to dilatation and its effect on the turbulence. Peak local reaction rates are found to be lower in the distributed case than in the lower Karlovitz cases but higher than in the laminar flame, which is attributed to effects that arise from the modified fuel-temperature distribution that results from turbulent mixing dominating low Lewis numbermore »« less

Authors:

^[1];

^[2];

^[2]

Newcastle Univ. (United Kingdom). School of Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Center for Computational Sciences and Engineering
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Center for Computational Sciences and Engineering

Publication Date:: 2019-07-25

Research Org.:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1526713

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Fluid Mechanics

Additional Journal Information:: Journal Volume: 871; Journal ID: ISSN 0022-1120

Publisher:: Cambridge University Press

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING

Citation Formats


                    Aspden, A. J., Day, M. S., and Bell, J. B. Towards the distributed burning regime in turbulent premixed flames.  United States: N. p., 2019. 
Web.  doi:10.1017/jfm.2019.316.

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                    Aspden, A. J., Day, M. S., & Bell, J. B. Towards the distributed burning regime in turbulent premixed flames.  United States.  https://doi.org/10.1017/jfm.2019.316

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                    Aspden, A. J., Day, M. S., and Bell, J. B. Thu .  
"Towards the distributed burning regime in turbulent premixed flames".  United States.  https://doi.org/10.1017/jfm.2019.316.  https://www.osti.gov/servlets/purl/1526713.

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@article{osti_1526713,

  title        = {Towards the distributed burning regime in turbulent premixed flames},

  author       = {Aspden, A. J. and Day, M. S. and Bell, J. B.},

  abstractNote = {Three-dimensional numerical simulations of canonical statistically steady, statistically planar turbulent flames have been used in an attempt to produce distributed burning in lean methane and hydrogen flames. Dilatation across the flame means that extremely large Karlovitz numbers are required; even at the extreme levels of turbulence studied (up to a Karlovitz number of 8767) distributed burning was only achieved in the hydrogen case. In this case, turbulence was found to broaden the reaction zone visually by around an order of magnitude, and thermodiffusive effects (typically present for lean hydrogen flames) were not observed. In the preheat zone, the species compositions differ considerably from those of one-dimensional flames based a number of different transport models (mixture averaged, unity Lewis number and a turbulent eddy viscosity model). The behaviour is a characteristic of turbulence dominating non-unity Lewis number species transport, and the distinct limit is again attributed to dilatation and its effect on the turbulence. Peak local reaction rates are found to be lower in the distributed case than in the lower Karlovitz cases but higher than in the laminar flame, which is attributed to effects that arise from the modified fuel-temperature distribution that results from turbulent mixing dominating low Lewis number thermodiffusive effects. Finally, approaches to achieve distributed burning at realisable conditions are discussed; factors that increase the likelihood of realising distributed burning are higher pressure, lower equivalence ratio, higher Lewis number and lower reactant temperature.},

  doi          = {10.1017/jfm.2019.316},

  journal      = {Journal of Fluid Mechanics},

  number       = ,

  volume       = 871,

  place        = {United States},

  year         = {2019},

  month        = {7}

}

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https://doi.org/10.1017/jfm.2019.316

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Figures / Tables:

Figure 1: Turbulent premixed regime diagram showing the simulations in the present study (plusses) along with our previous simulations (circles) at lower Ka [Aspden et al., 2017]; note that the critical Karlovitz number is shown in grey, and has been placed higher than is usual.

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Works referencing / citing this record:

A scaling analysis for the evolution of small-scale turbulence eddies across premixed flames with implications on distributed combustion
journal, October 2019

Paes, Paulo L. K.; Shah, Yash G.; Brasseur, James G.
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Figures / Tables found in this record:

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Title: Towards the distributed burning regime in turbulent premixed flames

Abstract

Citation Formats

Figures / Tables:

Finite Rate Chemistry Effects in Highly Sheared Turbulent Premixed Flames journal, July 2010

The interaction of high-speed turbulence with flames: Global properties and internal flame structure journal, May 2010

Turbulence–flame interactions in lean premixed dodecane flames journal, January 2017

Turbulence–flame interactions in lean premixed hydrogen: transition to the distributed burning regime journal, May 2011

Broken reaction zone and differential diffusion effects in high Karlovitz n-C7H16 premixed turbulent flames journal, May 2015

Thin reaction zone and distributed reaction zone regimes in turbulent premixed methane/air flames: Scalar distributions and correlations journal, January 2017

Direct numerical simulation of a high Ka CH4/air stratified premixed jet flame journal, July 2018

DISTRIBUTED FLAMES IN TYPE Ia SUPERNOVAE journal, February 2010

Turbulence‐Flame Interactions in Type Ia Supernovae journal, December 2008

A deferred correction coupling strategy for low Mach number flow with complex chemistry journal, December 2012

A numerical study of diffusive effects in turbulent lean premixed hydrogen flames journal, January 2017

The evolution equation for the flame surface density in turbulent premixed combustion journal, November 1994

Direct numerical simulation of H 2 /O 2 /N 2 flames with complex chemistry in two-dimensional turbulent flows journal, December 1994

Unsteady strain rate and curvature effects in turbulent premixed methane-air flames journal, July 1996

Differential diffusion effects, distributed burning, and local extinctions in high Karlovitz premixed flames journal, September 2015

Theory of turbulent combustion of a homogeneous fuel mixture at high reynolds numbers journal, January 1979

Numerical simulation of laminar reacting flows with complex chemistry journal, December 2000

Lewis number effects in distributed flames journal, January 2011

Three-dimensional direct numerical simulation of turbulent lean premixed methane combustion with detailed kinetics journal, April 2016

Optimized Transport Algorithms for Flame Codes journal, October 1996

An updated comprehensive kinetic model of hydrogen combustion journal, January 2004

Stretch effects on the burning velocity of turbulent premixed hydrogen/air flames journal, January 2000

Structures of turbulent premixed flames in the high Karlovitz number regime – DNS analysis journal, March 2018

Premixed flames subjected to extreme levels of turbulence part I: Flame structure and a new measured regime diagram journal, March 2018

Turbulence-chemistry interaction in lean premixed hydrogen combustion journal, January 2015

Turbulent Combustion journal, July 2001

Turbulent Combustion journal, May 2001

Turbulent Combustion journal, October 2001

The Interaction of High-Speed Turbulence with Flames: Global Properties and Internal Flame Structure text, January 2011

Distributed Flames in Type Ia Supernovae text, January 2011

A scaling analysis for the evolution of small-scale turbulence eddies across premixed flames with implications on distributed combustion journal, October 2019

Hidden prompt splashing by corona splashing at drop impact on a smooth dry surface journal, January 2020

Finite Rate Chemistry Effects in Highly Sheared Turbulent Premixed Flames
journal, July 2010

The interaction of high-speed turbulence with flames: Global properties and internal flame structure
journal, May 2010

Turbulence–flame interactions in lean premixed dodecane flames
journal, January 2017

Turbulence–flame interactions in lean premixed hydrogen: transition to the distributed burning regime
journal, May 2011

Broken reaction zone and differential diffusion effects in high Karlovitz n-C7H16 premixed turbulent flames
journal, May 2015

Thin reaction zone and distributed reaction zone regimes in turbulent premixed methane/air flames: Scalar distributions and correlations
journal, January 2017

Direct numerical simulation of a high Ka CH4/air stratified premixed jet flame
journal, July 2018

DISTRIBUTED FLAMES IN TYPE Ia SUPERNOVAE
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Turbulence‐Flame Interactions in Type Ia Supernovae
journal, December 2008

A deferred correction coupling strategy for low Mach number flow with complex chemistry
journal, December 2012

A numerical study of diffusive effects in turbulent lean premixed hydrogen flames
journal, January 2017

The evolution equation for the flame surface density in turbulent premixed combustion
journal, November 1994

Direct numerical simulation of H ₂ /O ₂ /N ₂ flames with complex chemistry in two-dimensional turbulent flows
journal, December 1994

Unsteady strain rate and curvature effects in turbulent premixed methane-air flames
journal, July 1996

Differential diffusion effects, distributed burning, and local extinctions in high Karlovitz premixed flames
journal, September 2015

Theory of turbulent combustion of a homogeneous fuel mixture at high reynolds numbers
journal, January 1979

Numerical simulation of laminar reacting flows with complex chemistry
journal, December 2000

Lewis number effects in distributed flames
journal, January 2011

Three-dimensional direct numerical simulation of turbulent lean premixed methane combustion with detailed kinetics
journal, April 2016

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journal, October 1996

An updated comprehensive kinetic model of hydrogen combustion
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journal, January 2000

Structures of turbulent premixed flames in the high Karlovitz number regime – DNS analysis
journal, March 2018

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journal, March 2018

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Turbulent Combustion
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Turbulent Combustion
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A scaling analysis for the evolution of small-scale turbulence eddies across premixed flames with implications on distributed combustion
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Hidden prompt splashing by corona splashing at drop impact on a smooth dry surface
journal, January 2020