On the evaluation of stratification effect on unsteady counterflow flames under mixture composition oscillation

Takuya Tomidokoro*, Takeshi Yokomori, Hong G. Im, Toshihisa Ueda

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

Abstract

Although an extensive study has been conducted to elucidate the effect of equivalence ratio gradient on flame characteristics, some disagreements regarding the mechanism of the stratification effect exist. This may be attributed to differences in the flame properties used to evaluate the stratification effects. The present study evaluated the magnitude of the stratification effects with various flame properties used previously, and compared their response to mixture composition oscillations. The response of displacement speed was affected by unsteady gas expansion, while the response of consumption speed directly represented the variation in the reaction rate. The response of peak heat release rate provided a better representation of the response of fuel consumption rate than the global heat release rate, because it measures the local characteristics at the reaction zone and does not include heat release variations in the wake of the flame. However, the peak heat release rate overestimates the magnitude of the stratification effect due to additional variation in the heat release from H2 oxidation reaction, which is caused by increase/decrease in the H2 diffusion from the burned side.

Original languageEnglish (US)
StatePublished - 2019
Event12th Asia-Pacific Conference on Combustion, ASPACC 2019 - Fukuoka, Japan
Duration: Jul 1 2019Jul 5 2019

Conference

Conference12th Asia-Pacific Conference on Combustion, ASPACC 2019
Country/TerritoryJapan
CityFukuoka
Period07/1/1907/5/19

Bibliographical note

Publisher Copyright:
© Asia-Pacific Conference on Combustion, ASPACC 2019.All right reserved.

ASJC Scopus subject areas

  • General Chemical Engineering
  • Energy Engineering and Power Technology
  • Fuel Technology
  • Condensed Matter Physics

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