Flickering characteristics and temperature field of premixed methane/air flame under the influence of co-flow

Fujisawa, Nobuyuki; Abe, Takao; Yamagata, Takayuki; Tomidokoro, Hirofumi

doi:10.1016/j.enconman.2013.10.059

Cited by 20 publications

(7 citation statements)

References 24 publications

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“…Most of the practical techniques are conducted by thermocouples and resistance thermometers [7]. These methods are intrusive, point-wise and disturb the temperature field in the region of interest.…”

Section: Introductionmentioning

confidence: 99%

Temperature field measurement of an array of laminar premixed slot flame Jets using Mach-Zehnder interferometry

Ashrafi

Ashjaee

2015

Optics and Lasers in Engineering

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Section: Introductionmentioning

confidence: 99%

Temperature field measurement of an array of laminar premixed slot flame Jets using Mach-Zehnder interferometry

Ashrafi

Ashjaee

2015

Optics and Lasers in Engineering

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“…Several investigators studied the heat transfer characteristics of a premixed butane-air [13,14], biogas-hydrogen [15], and methane-air [16,17] flame jet impinging on a flat plate. Dong et al, [13] and Kwok et al, [14] carried out the shape and the heat transfer characteristics of an array of three laminar premixed butane/air slot flame jets impinging on a horizontal water-cooled flat plate at the Reynolds number (Re) of 800 to 1,200.…”

Section: Introductionmentioning

confidence: 99%

“…They concluded that the increased velocity of unburnt gas can effectively enhance the local heat flux and the whole heat transfer rate through the stronger forced convection and more energy input. Fujisawa et al, [16] and Kuntikana et al, [17] investigated heat transfer characteristics of premixed methane-air flame jet impinging on a flat surface at Re = 400-1,200, ϕ = 0.8-1.5, and burner to plate distance ratio (H/D) of 2-6. They found that stoichiometric mixture (ϕ = 1.0) provided optimum heat transfer rate and lower H/D gave maximum effectiveness for impinging premixed cone flames.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pulsating Flame Jet on Flow and Heat Transfer Characteristics

Boonyopas

Uppatam

Aroonrujiphan

et al. 2020

ARFMTS

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This research aims to study the effect of pulsating frequency on flame structure and heat transfer characteristics of premixed flame from a pipe nozzle. The LPG and air were used as gas fuel and oxidizer. The equivalence ratios ( ) were evaluated at 0.8, 1.0, and 1.2 under a constant Reynolds number Re = 500. The effect of nozzle-to-impingement surface distance ratio was investigated at H = 2D to 10D, here D is the nozzle diameter at 12 mm. The frequency of pulsating (f) was varied from f = 0 to 10 Hz using a solenoid valve. The flame structures of free flame jet and the impinging flame jet were recorded with a digital camera. The average heat flux on impingement surface was measured with water cooling plate and evaluated from the heat balance of the cooling water. The results show that the pulsating of flame jet become having gap on flame and the mushroom appear at the end of flame. The size of mushroom structure becomes larger when increasing the frequency. While the non-pulsating jet did not appear in this structure. Pulsating flame jet can increase the overall average heat flux on the impingement surface up to about 12% for case of = 1.2 and H = 2D and f = 10 Hz. when compared to case of f = 0 Hz.

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“…Durox et al [23] studied the oscillating behavior of premixed flames under varying pressure, flow velocity, and equivalence ratio. Fujisawa et al [24] examined the influence of co-flow on flame flickering and concluded that the pulsation frequency increases and amplitude declines with the increase in the velocity of co-flow, while the amplitude enlarges as the equivalence ratio grows.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis on Flame Flickering of a Swirl Partially Premixed Combustion

Sabir

et al. 2018

Energies

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An experiment was conducted to explore the flickering parameters under varying mass flow rate of fuelṁ F with spatial analysis and global analysis. The parameters include mean value, flickering weighted average frequency F, flickering coefficient of variation c v (firstly introduced), skewness s, and kurtosis k. From the spatial analysis, it was found that the brightest part of flame is located in its core, and the brightness gradually decreased from the inside out. The distributions of high levels of F, c v , s, and k are almost consistent, all lying in the flickering edge, which is a thin layer where the parameters sharply declined. From the global analysis, with the increment oḟ m F , the global F decreased slightly; the global c v declined uniformly, which means the oscillation amplitude diminished and thus the flame became more stable; the global s linearly reduced; and the global k also showed a decreasing trend. The decreasing global s indicates that the number distribution gradually became symmetric, and the decreasing global k indicates that the number distribution progressively became flat. Consequently, the number distribution progressively tends to normal distribution at largerṁ F . Keywords: flame flickering; partially premixed flame; varying mass flow rate of fuel; spatial analysis and global analysis; flickering weighted average frequency; flickering coefficient of variation; skewness and kurtosis

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Flickering characteristics and temperature field of premixed methane/air flame under the influence of co-flow

Cited by 20 publications

References 24 publications

Temperature field measurement of an array of laminar premixed slot flame Jets using Mach-Zehnder interferometry

Temperature field measurement of an array of laminar premixed slot flame Jets using Mach-Zehnder interferometry

Effect of Pulsating Flame Jet on Flow and Heat Transfer Characteristics

Experimental Analysis on Flame Flickering of a Swirl Partially Premixed Combustion

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