Extinction and flame front behavior of ultra lean premixed flame formed in opposite flow

Yuji Yahagi, Hironobu Nihei

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Extinction and flame front behavior of ultra lean premixed flames of propane/air and methane/air mixtures formed in opposite turbulent flow have been studied experimentally. Extinction limits, velocity profiles and time series flame front movement in the near extinction limits have been measured and the extinction mechanism has been discussed. The distance of hot and cold boundaries between the upper flow and the lower flow are increased due to turbulent burning velocity. Furthermore, the flame stretch duo to flame wrinkling as well as the turbulent flame motion also affect to the flame extinction. Therefore, the extinction limit increases with increase in the turbulence. Extinction limits of the propane-air flame depend on the more concentrated burner condition regardless of the less concentrated burner condition. The methane-air ultra lean mixture could be react impinging to the high temperature burnt gas and the stable region extends to the lower fuel concentration zone. The characteristics of hot and cold boundary movement remarkably change with the concentration of the premixed gas even when the turbulence conditions of the approach flows are equal.

Original languageEnglish
Pages (from-to)1287-1294
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume68
Issue number668
Publication statusPublished - 2002 Apr

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premixed flames
flame propagation
extinction
Air
Fuel burners
flames
Propane
Methane
Turbulence
air
burners
propane
Gases
Turbulent flow
methane
Time series
turbulence
wrinkling
turbulent flames
gases

Keywords

  • Combustion phenomena
  • Extinction
  • Heat loss
  • Internal combustion engine
  • Opposite flow
  • Premixed combustion
  • Turbulent flow
  • Ultra lean combustion

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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title = "Extinction and flame front behavior of ultra lean premixed flame formed in opposite flow",
abstract = "Extinction and flame front behavior of ultra lean premixed flames of propane/air and methane/air mixtures formed in opposite turbulent flow have been studied experimentally. Extinction limits, velocity profiles and time series flame front movement in the near extinction limits have been measured and the extinction mechanism has been discussed. The distance of hot and cold boundaries between the upper flow and the lower flow are increased due to turbulent burning velocity. Furthermore, the flame stretch duo to flame wrinkling as well as the turbulent flame motion also affect to the flame extinction. Therefore, the extinction limit increases with increase in the turbulence. Extinction limits of the propane-air flame depend on the more concentrated burner condition regardless of the less concentrated burner condition. The methane-air ultra lean mixture could be react impinging to the high temperature burnt gas and the stable region extends to the lower fuel concentration zone. The characteristics of hot and cold boundary movement remarkably change with the concentration of the premixed gas even when the turbulence conditions of the approach flows are equal.",
keywords = "Combustion phenomena, Extinction, Heat loss, Internal combustion engine, Opposite flow, Premixed combustion, Turbulent flow, Ultra lean combustion",
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AU - Nihei, Hironobu

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N2 - Extinction and flame front behavior of ultra lean premixed flames of propane/air and methane/air mixtures formed in opposite turbulent flow have been studied experimentally. Extinction limits, velocity profiles and time series flame front movement in the near extinction limits have been measured and the extinction mechanism has been discussed. The distance of hot and cold boundaries between the upper flow and the lower flow are increased due to turbulent burning velocity. Furthermore, the flame stretch duo to flame wrinkling as well as the turbulent flame motion also affect to the flame extinction. Therefore, the extinction limit increases with increase in the turbulence. Extinction limits of the propane-air flame depend on the more concentrated burner condition regardless of the less concentrated burner condition. The methane-air ultra lean mixture could be react impinging to the high temperature burnt gas and the stable region extends to the lower fuel concentration zone. The characteristics of hot and cold boundary movement remarkably change with the concentration of the premixed gas even when the turbulence conditions of the approach flows are equal.

AB - Extinction and flame front behavior of ultra lean premixed flames of propane/air and methane/air mixtures formed in opposite turbulent flow have been studied experimentally. Extinction limits, velocity profiles and time series flame front movement in the near extinction limits have been measured and the extinction mechanism has been discussed. The distance of hot and cold boundaries between the upper flow and the lower flow are increased due to turbulent burning velocity. Furthermore, the flame stretch duo to flame wrinkling as well as the turbulent flame motion also affect to the flame extinction. Therefore, the extinction limit increases with increase in the turbulence. Extinction limits of the propane-air flame depend on the more concentrated burner condition regardless of the less concentrated burner condition. The methane-air ultra lean mixture could be react impinging to the high temperature burnt gas and the stable region extends to the lower fuel concentration zone. The characteristics of hot and cold boundary movement remarkably change with the concentration of the premixed gas even when the turbulence conditions of the approach flows are equal.

KW - Combustion phenomena

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