This paper reports the findings from a three-dimensional direct numerical simulation conducted to investigate the turbulent flame behaviors of premixed high-hydrogen content syngas (with 50% hydrogen on a per mole basis) and air mixtures. To accomplish this, a laminar flame front is placed in a homogeneous isotropic decaying turbulence field composed of a syngas–air mixture at an equivalence ratio of 0.7 and allowed to evolve for 1.4 eddy turnover times. Homogeneous isotropic turbulence is generated using a helical forcing function in a cubic domain with a grid size of 256 × 256 × 256. The Reynolds number based on the Taylor microscale, Reλ, is 57 for the generated turbulence field. The laminar flame front is placed at the center of the domain. The premixture enters the domain at a velocity of 8 m/s and at an initial temperature of 800 K. The pressure remains constant at 1 atm. In addition to quantifying the spatial and temporal evolution of turbulent characteristics and flame structure, the study also focuses on identifying turbulence/flame interactions, specifically, the impact of these interactions on flame thickness. Energy transfer from small to large scales, i.e., a reverse cascade is observed as a result of energy release due to chemical reactions at the small scales that is transferred to larger scales. The increase in turbulent intensities due to chemical reactions correlates with flame thickening.
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July 2023
Research Article|
July 27 2023
Interactions between high hydrogen content syngas–air premixed flames and homogeneous isotropic turbulence: Flame thickening
Special Collection:
Hydrogen Flame and Detonation Physics
Himakar Ganti
;
Himakar Ganti
(Conceptualization, Data curation, Formal analysis, Methodology, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
Department of Aerospace Engineering, University of Cincinnati
, Cincinnati, Ohio 45221-0070, USA
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Luis Bravo
;
Luis Bravo
(Resources, Supervision, Writing – review & editing)
2
US Army Research Laboratory, Aberdeen Proving Ground
, Maryland 21005, USA
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Prashant Khare
Prashant Khare
a)
(Conceptualization, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Writing – review & editing)
1
Department of Aerospace Engineering, University of Cincinnati
, Cincinnati, Ohio 45221-0070, USA
a)Author to whom the correspondence should be addressed: Prashant.Khare@uc.edu
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a)Author to whom the correspondence should be addressed: Prashant.Khare@uc.edu
Physics of Fluids 35, 075150 (2023)
Article history
Received:
April 30 2023
Accepted:
June 24 2023
Connected Content
A companion article has been published:
Studying the effect of increasing the hydrogen content in hydrogen-enriched synthetic gas
Citation
Himakar Ganti, Luis Bravo, Prashant Khare; Interactions between high hydrogen content syngas–air premixed flames and homogeneous isotropic turbulence: Flame thickening. Physics of Fluids 1 July 2023; 35 (7): 075150. https://doi.org/10.1063/5.0156537
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