The instability characteristics of lean premixed hydrogen and syngas flames stabilized on meso-scale bluff-body

Yu Jeong Kim; Bok Jik Lee; Hong G. Im

doi:10.2514/6.2017-1103

The instability characteristics of lean premixed hydrogen and syngas flames stabilized on meso-scale bluff-body

Yu Jeong Kim, Bok Jik Lee, Hong G. Im

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Bluff-body flame stabilization has been used as one of main flame stabilization schemes to improve combustion stability in both large and small scale premixed combustion systems. The detailed investigation of instability characteristics is needed to understand flame stability mechanism. Direct numerical simulations are conducted to investigate flame dynamics on the instability of lean premixed hydrogen/air and syngas/air flames stabilized on a meso-scale bluff-body. A two-dimensional channel of 10 mm height and 10 mm length with a square bluff-body stabilizer of 0.5 mm is considered. The height of domain is chosen as an unconfined condition to minimize the effect of the blockage ratio. Flame/flow dynamics are observed by increasing the mean inflow velocity from a steady stable to unsteady asymmetrical instability, followed by blowoff. Detailed observations between hydrogen and syngas flames with a time scale analysis are presented.

Original language	English (US)
Title of host publication	55th AIAA Aerospace Sciences Meeting
Publisher	American Institute of Aeronautics and Astronautics (AIAA)
ISBN (Print)	9781624104473
DOIs	https://doi.org/10.2514/6.2017-1103
State	Published - Jan 5 2017

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title = "The instability characteristics of lean premixed hydrogen and syngas flames stabilized on meso-scale bluff-body",

abstract = "Bluff-body flame stabilization has been used as one of main flame stabilization schemes to improve combustion stability in both large and small scale premixed combustion systems. The detailed investigation of instability characteristics is needed to understand flame stability mechanism. Direct numerical simulations are conducted to investigate flame dynamics on the instability of lean premixed hydrogen/air and syngas/air flames stabilized on a meso-scale bluff-body. A two-dimensional channel of 10 mm height and 10 mm length with a square bluff-body stabilizer of 0.5 mm is considered. The height of domain is chosen as an unconfined condition to minimize the effect of the blockage ratio. Flame/flow dynamics are observed by increasing the mean inflow velocity from a steady stable to unsteady asymmetrical instability, followed by blowoff. Detailed observations between hydrogen and syngas flames with a time scale analysis are presented.",

author = "Kim, {Yu Jeong} and Lee, {Bok Jik} and Im, {Hong G.}",

note = "KAUST Repository Item: Exported on 2021-06-30 Acknowledgements: This work has been sponsored by King Abdullah University of Science and Technology (KAUST). The simulations utilized computing resources at KAUST Supercomputing Laboratory and Research Computing.",

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month = jan,

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doi = "10.2514/6.2017-1103",

language = "English (US)",

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AU - Kim, Yu Jeong

AU - Lee, Bok Jik

AU - Im, Hong G.

N1 - KAUST Repository Item: Exported on 2021-06-30 Acknowledgements: This work has been sponsored by King Abdullah University of Science and Technology (KAUST). The simulations utilized computing resources at KAUST Supercomputing Laboratory and Research Computing.

PY - 2017/1/5

Y1 - 2017/1/5

N2 - Bluff-body flame stabilization has been used as one of main flame stabilization schemes to improve combustion stability in both large and small scale premixed combustion systems. The detailed investigation of instability characteristics is needed to understand flame stability mechanism. Direct numerical simulations are conducted to investigate flame dynamics on the instability of lean premixed hydrogen/air and syngas/air flames stabilized on a meso-scale bluff-body. A two-dimensional channel of 10 mm height and 10 mm length with a square bluff-body stabilizer of 0.5 mm is considered. The height of domain is chosen as an unconfined condition to minimize the effect of the blockage ratio. Flame/flow dynamics are observed by increasing the mean inflow velocity from a steady stable to unsteady asymmetrical instability, followed by blowoff. Detailed observations between hydrogen and syngas flames with a time scale analysis are presented.

AB - Bluff-body flame stabilization has been used as one of main flame stabilization schemes to improve combustion stability in both large and small scale premixed combustion systems. The detailed investigation of instability characteristics is needed to understand flame stability mechanism. Direct numerical simulations are conducted to investigate flame dynamics on the instability of lean premixed hydrogen/air and syngas/air flames stabilized on a meso-scale bluff-body. A two-dimensional channel of 10 mm height and 10 mm length with a square bluff-body stabilizer of 0.5 mm is considered. The height of domain is chosen as an unconfined condition to minimize the effect of the blockage ratio. Flame/flow dynamics are observed by increasing the mean inflow velocity from a steady stable to unsteady asymmetrical instability, followed by blowoff. Detailed observations between hydrogen and syngas flames with a time scale analysis are presented.

UR - http://hdl.handle.net/10754/625565

UR - https://arc.aiaa.org/doi/10.2514/6.2017-1103

UR - http://www.scopus.com/inward/record.url?scp=85017212837&partnerID=8YFLogxK

U2 - 10.2514/6.2017-1103

DO - 10.2514/6.2017-1103

M3 - Conference contribution

AN - SCOPUS:85017212837

SN - 9781624104473

BT - 55th AIAA Aerospace Sciences Meeting

PB - American Institute of Aeronautics and Astronautics (AIAA)

ER -

The instability characteristics of lean premixed hydrogen and syngas flames stabilized on meso-scale bluff-body

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