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Numerical and Experimental Study on Laminar Methane/Air Premixed Flames at Varying Pressure

Hu, Siyuan LU ; Gao, Jinlong LU ; Zhou, Yajun; Gong, Cheng LU ; Bai, Xue Song LU ; Li, Zhongshan LU and Alden, Marcus LU (2017) In Energy Procedia 105. p.4970-4975
Abstract

Laminar methane/air premixed Bunsen flames were studied using detailed numerical simulations and laser diagnostics. In the numerical simulations one-dimensional and two-dimensional configurations were considered with detailed transport properties and chemical kinetic mechanism. In the measurements OH PLIF was employed. The flame structures vary with varying equivalence ratio and pressure. For stoichiometric mixture at atmospheric pressure the flame exhibits a single reaction zone structure, while at high-pressures the flame exhibits a two-reaction zone structure: an inner premixed flame and an outer diffusion flame. The predicted two-zone structure is confirmed in the OH PLIF measurements. Using the numerical and the experimental data... (More)

Laminar methane/air premixed Bunsen flames were studied using detailed numerical simulations and laser diagnostics. In the numerical simulations one-dimensional and two-dimensional configurations were considered with detailed transport properties and chemical kinetic mechanism. In the measurements OH PLIF was employed. The flame structures vary with varying equivalence ratio and pressure. For stoichiometric mixture at atmospheric pressure the flame exhibits a single reaction zone structure, while at high-pressures the flame exhibits a two-reaction zone structure: an inner premixed flame and an outer diffusion flame. The predicted two-zone structure is confirmed in the OH PLIF measurements. Using the numerical and the experimental data the methods of flame-cone-angle and flame-area have been used to extract the laminar flame speed for different equivalence ratios and pressures. It is found that although the flame cone angle method is widely used, it yields a lower accuracy than that of the flame surface area method. The inlet velocity of the burner is shown to affect the accuracy of extracted laminar flame speed. It is suggested that the most suitable inlet velocity of methane-air mixture is about 6 times the laminar flame speed.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
flame structures, high pressure, laminar flame speed, methane/air
in
Energy Procedia
volume
105
pages
6 pages
publisher
Elsevier
external identifiers
  • scopus:85020693368
  • wos:000404967905013
ISSN
1876-6102
DOI
10.1016/j.egypro.2017.03.993
language
English
LU publication?
yes
id
c5d039c6-2963-459c-b3e8-eabd794f797e
date added to LUP
2017-07-04 14:27:24
date last changed
2018-01-16 13:21:00
@article{c5d039c6-2963-459c-b3e8-eabd794f797e,
  abstract     = {<p>Laminar methane/air premixed Bunsen flames were studied using detailed numerical simulations and laser diagnostics. In the numerical simulations one-dimensional and two-dimensional configurations were considered with detailed transport properties and chemical kinetic mechanism. In the measurements OH PLIF was employed. The flame structures vary with varying equivalence ratio and pressure. For stoichiometric mixture at atmospheric pressure the flame exhibits a single reaction zone structure, while at high-pressures the flame exhibits a two-reaction zone structure: an inner premixed flame and an outer diffusion flame. The predicted two-zone structure is confirmed in the OH PLIF measurements. Using the numerical and the experimental data the methods of flame-cone-angle and flame-area have been used to extract the laminar flame speed for different equivalence ratios and pressures. It is found that although the flame cone angle method is widely used, it yields a lower accuracy than that of the flame surface area method. The inlet velocity of the burner is shown to affect the accuracy of extracted laminar flame speed. It is suggested that the most suitable inlet velocity of methane-air mixture is about 6 times the laminar flame speed.</p>},
  author       = {Hu, Siyuan and Gao, Jinlong and Zhou, Yajun and Gong, Cheng and Bai, Xue Song and Li, Zhongshan and Alden, Marcus},
  issn         = {1876-6102},
  keyword      = {flame structures,high pressure,laminar flame speed,methane/air},
  language     = {eng},
  pages        = {4970--4975},
  publisher    = {Elsevier},
  series       = {Energy Procedia},
  title        = {Numerical and Experimental Study on Laminar Methane/Air Premixed Flames at Varying Pressure},
  url          = {http://dx.doi.org/10.1016/j.egypro.2017.03.993},
  volume       = {105},
  year         = {2017},
}