Structure of hydrogen-rich transverse jets in a vitiated turbulent flow

Lyra, Sgouria; Wilde, Benjamin; Kolla, Hemanth; Seitzman, Jerry M.; Lieuwen, Timothy C.; Chen, Jacqueline H.

doi:10.1016/j.combustflame.2014.10.014

Title: Structure of hydrogen-rich transverse jets in a vitiated turbulent flow

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Abstract

Our paper reports the results of a joint experimental and numerical study of the flow characteristics and flame structure of a hydrogen rich jet injected normal to a turbulent, vitiated crossflow of lean methane combustion products. Simultaneous high-speed stereoscopic PIV and OH PLIF measurements were obtained and analyzed alongside three-dimensional direct numerical simulations of inert and reacting JICF with detailed H2/COH2/CO chemistry. Both the experiment and the simulation reveal that, contrary to most previous studies of reacting JICF stabilized in low-to-moderate temperature air crossflow, the present conditions lead to a burner-attached flame that initiates uniformly around the burner edge. Significant asymmetry is observed, however, between the reaction zones located on the windward and leeward sides of the jet, due to the substantially different scalar dissipation rates. The windward reaction zone is much thinner in the near field, while also exhibiting significantly higher local and global heat release than the much broader reaction zone found on the leeward side of the jet. The unsteady dynamics of the windward shear layer, which largely control the important jet/crossflow mixing processes in that region, are explored in order to elucidate the important flow stability implications arising in the inert and reacting JICF. The papermore »« less

Authors:

Lyra, Sgouria ^[1]; Wilde, Benjamin ^[2]; Kolla, Hemanth ^[1]; Seitzman, Jerry M. ^[2]; Lieuwen, Timothy C. ^[2]; Chen, Jacqueline H. ^[1]

Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Georgia Inst. of Technology, Atlanta, GA (United States)

Publication Date:: Mon Nov 24 00:00:00 EST 2014

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1184577

Alternate Identifier(s):: OSTI ID: 1246722

Report Number(s):: SAND-2014-19271J
Journal ID: ISSN 0010-2180; 540820

Grant/Contract Number:: AC04-94AL85000

Resource Type:: Accepted Manuscript

Journal Name:: Combustion and Flame

Additional Journal Information:: Journal Volume: 162; Journal ID: ISSN 0010-2180

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING; DNS; experiment; transverse jet; vitiated crossflow

Citation Formats


                    Lyra, Sgouria, Wilde, Benjamin, Kolla, Hemanth, Seitzman, Jerry M., Lieuwen, Timothy C., and Chen, Jacqueline H. Structure of hydrogen-rich transverse jets in a vitiated turbulent flow.  United States: N. p., 2014. 
Web.  doi:10.1016/j.combustflame.2014.10.014.

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                    Lyra, Sgouria, Wilde, Benjamin, Kolla, Hemanth, Seitzman, Jerry M., Lieuwen, Timothy C., & Chen, Jacqueline H. Structure of hydrogen-rich transverse jets in a vitiated turbulent flow.  United States.  https://doi.org/10.1016/j.combustflame.2014.10.014

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                    Lyra, Sgouria, Wilde, Benjamin, Kolla, Hemanth, Seitzman, Jerry M., Lieuwen, Timothy C., and Chen, Jacqueline H. Mon .  
"Structure of hydrogen-rich transverse jets in a vitiated turbulent flow".  United States.  https://doi.org/10.1016/j.combustflame.2014.10.014.  https://www.osti.gov/servlets/purl/1184577.

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@article{osti_1184577,

  title        = {Structure of hydrogen-rich transverse jets in a vitiated turbulent flow},

  author       = {Lyra, Sgouria and Wilde, Benjamin and Kolla, Hemanth and Seitzman, Jerry M. and Lieuwen, Timothy C. and Chen, Jacqueline H.},

  abstractNote = {Our paper reports the results of a joint experimental and numerical study of the flow characteristics and flame structure of a hydrogen rich jet injected normal to a turbulent, vitiated crossflow of lean methane combustion products. Simultaneous high-speed stereoscopic PIV and OH PLIF measurements were obtained and analyzed alongside three-dimensional direct numerical simulations of inert and reacting JICF with detailed H2/COH2/CO chemistry. Both the experiment and the simulation reveal that, contrary to most previous studies of reacting JICF stabilized in low-to-moderate temperature air crossflow, the present conditions lead to a burner-attached flame that initiates uniformly around the burner edge. Significant asymmetry is observed, however, between the reaction zones located on the windward and leeward sides of the jet, due to the substantially different scalar dissipation rates. The windward reaction zone is much thinner in the near field, while also exhibiting significantly higher local and global heat release than the much broader reaction zone found on the leeward side of the jet. The unsteady dynamics of the windward shear layer, which largely control the important jet/crossflow mixing processes in that region, are explored in order to elucidate the important flow stability implications arising in the inert and reacting JICF. The paper concludes with an analysis of the ignition, flame characteristics, and global structure of the burner-attached flame. FurthermoreChemical explosive mode analysis (CEMA) shows that the entire windward shear layer, and a large region on the leeward side of the jet, are highly explosive prior to ignition and are dominated by non-premixed flame structures after ignition. The predominantly mixing limited nature of the flow after ignition is examined by computing the Takeno flame index, which shows that ~70% of the heat release occurs in non-premixed regions.},

  doi          = {10.1016/j.combustflame.2014.10.014},

  journal      = {Combustion and Flame},

  number       = ,

  volume       = 162,

  place        = {United States},

  year         = {Mon Nov 24 00:00:00 EST 2014},

  month        = {Mon Nov 24 00:00:00 EST 2014}

}

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