Characteristic of the premixed flame in a triple flame

Mitsutomo Hirota, Akiko Matsuo, Masahiko Mizomoto

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Burning velocity and thermal diffusive structure of a triple flame generated with methane-air mixture are experimentally investigated in various fuel concentration gradients. The thermal diffusive width of premixed flame wing related preheat zone, which is measured from laser tomographic images, decreases by increasing the concentration gradient. On the other hand, burning velocity of the triple flame, which is measured from PIV, is almost constant. C. J. Sun et al. propose the theory on the burning velocity and preheat zone width, which takes into account the effect of flame curvature, strain and Le number. The burning velocity by their theory is smaller than the measured triple flame burning velocity and shows the tendency to decrease by increasing the concentration gradient. Similarly, the preheat zone width by their theory is larger than the measured thermal diffusive width of triple flame and is almost constant at any concentration gradients. Burning velocity along the premixed flame wing indicate the distribution of the flame temperature. These profiles and flame structure show the tendency that heat flux from non-premixed flame to premixed flame goes up by increasing the concentration gradient. Especially, the rich side heat flux is larger than lean side one. Because of this effect, the thermal structure of the premixed flame wing is changed and the burning velocity is kept constant by changing the concentration gradient. These results indicate that there exists the thermal interaction between the premixed and non-premixed flames at a leading edge of the triple flame. And non-premixed flame interacts with rich premixed flame stronger than lean premixed flame.

Original languageEnglish
Pages (from-to)177-184
Number of pages8
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume69
Issue number677
Publication statusPublished - 2003 Jan
Externally publishedYes

Fingerprint

premixed flames
flames
gradients
wings
Heat flux
heat flux
tendencies
flame temperature
Methane
particle image velocimetry
Hot Temperature
leading edges
Lasers
methane
curvature
Air

Keywords

  • Burning velocity
  • Concentration gradient
  • Diffusion combustion
  • Flame interaction
  • Flame structure
  • Premixed combustion
  • Triple flame

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Characteristic of the premixed flame in a triple flame. / Hirota, Mitsutomo; Matsuo, Akiko; Mizomoto, Masahiko.

In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 69, No. 677, 01.2003, p. 177-184.

Research output: Contribution to journalArticle

@article{e2bec91088b14f95b2d2c3cdd950abc2,
title = "Characteristic of the premixed flame in a triple flame",
abstract = "Burning velocity and thermal diffusive structure of a triple flame generated with methane-air mixture are experimentally investigated in various fuel concentration gradients. The thermal diffusive width of premixed flame wing related preheat zone, which is measured from laser tomographic images, decreases by increasing the concentration gradient. On the other hand, burning velocity of the triple flame, which is measured from PIV, is almost constant. C. J. Sun et al. propose the theory on the burning velocity and preheat zone width, which takes into account the effect of flame curvature, strain and Le number. The burning velocity by their theory is smaller than the measured triple flame burning velocity and shows the tendency to decrease by increasing the concentration gradient. Similarly, the preheat zone width by their theory is larger than the measured thermal diffusive width of triple flame and is almost constant at any concentration gradients. Burning velocity along the premixed flame wing indicate the distribution of the flame temperature. These profiles and flame structure show the tendency that heat flux from non-premixed flame to premixed flame goes up by increasing the concentration gradient. Especially, the rich side heat flux is larger than lean side one. Because of this effect, the thermal structure of the premixed flame wing is changed and the burning velocity is kept constant by changing the concentration gradient. These results indicate that there exists the thermal interaction between the premixed and non-premixed flames at a leading edge of the triple flame. And non-premixed flame interacts with rich premixed flame stronger than lean premixed flame.",
keywords = "Burning velocity, Concentration gradient, Diffusion combustion, Flame interaction, Flame structure, Premixed combustion, Triple flame",
author = "Mitsutomo Hirota and Akiko Matsuo and Masahiko Mizomoto",
year = "2003",
month = "1",
language = "English",
volume = "69",
pages = "177--184",
journal = "Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B",
issn = "0387-5016",
publisher = "Japan Society of Mechanical Engineers",
number = "677",

}

TY - JOUR

T1 - Characteristic of the premixed flame in a triple flame

AU - Hirota, Mitsutomo

AU - Matsuo, Akiko

AU - Mizomoto, Masahiko

PY - 2003/1

Y1 - 2003/1

N2 - Burning velocity and thermal diffusive structure of a triple flame generated with methane-air mixture are experimentally investigated in various fuel concentration gradients. The thermal diffusive width of premixed flame wing related preheat zone, which is measured from laser tomographic images, decreases by increasing the concentration gradient. On the other hand, burning velocity of the triple flame, which is measured from PIV, is almost constant. C. J. Sun et al. propose the theory on the burning velocity and preheat zone width, which takes into account the effect of flame curvature, strain and Le number. The burning velocity by their theory is smaller than the measured triple flame burning velocity and shows the tendency to decrease by increasing the concentration gradient. Similarly, the preheat zone width by their theory is larger than the measured thermal diffusive width of triple flame and is almost constant at any concentration gradients. Burning velocity along the premixed flame wing indicate the distribution of the flame temperature. These profiles and flame structure show the tendency that heat flux from non-premixed flame to premixed flame goes up by increasing the concentration gradient. Especially, the rich side heat flux is larger than lean side one. Because of this effect, the thermal structure of the premixed flame wing is changed and the burning velocity is kept constant by changing the concentration gradient. These results indicate that there exists the thermal interaction between the premixed and non-premixed flames at a leading edge of the triple flame. And non-premixed flame interacts with rich premixed flame stronger than lean premixed flame.

AB - Burning velocity and thermal diffusive structure of a triple flame generated with methane-air mixture are experimentally investigated in various fuel concentration gradients. The thermal diffusive width of premixed flame wing related preheat zone, which is measured from laser tomographic images, decreases by increasing the concentration gradient. On the other hand, burning velocity of the triple flame, which is measured from PIV, is almost constant. C. J. Sun et al. propose the theory on the burning velocity and preheat zone width, which takes into account the effect of flame curvature, strain and Le number. The burning velocity by their theory is smaller than the measured triple flame burning velocity and shows the tendency to decrease by increasing the concentration gradient. Similarly, the preheat zone width by their theory is larger than the measured thermal diffusive width of triple flame and is almost constant at any concentration gradients. Burning velocity along the premixed flame wing indicate the distribution of the flame temperature. These profiles and flame structure show the tendency that heat flux from non-premixed flame to premixed flame goes up by increasing the concentration gradient. Especially, the rich side heat flux is larger than lean side one. Because of this effect, the thermal structure of the premixed flame wing is changed and the burning velocity is kept constant by changing the concentration gradient. These results indicate that there exists the thermal interaction between the premixed and non-premixed flames at a leading edge of the triple flame. And non-premixed flame interacts with rich premixed flame stronger than lean premixed flame.

KW - Burning velocity

KW - Concentration gradient

KW - Diffusion combustion

KW - Flame interaction

KW - Flame structure

KW - Premixed combustion

KW - Triple flame

UR - http://www.scopus.com/inward/record.url?scp=0037254884&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037254884&partnerID=8YFLogxK

M3 - Article

VL - 69

SP - 177

EP - 184

JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

SN - 0387-5016

IS - 677

ER -