Concentration profile of particles across a flame propagating through an iron particle cloud

Sun, Jinhua; Dobashi, Ritsu; Hirano, Toshisuke

doi:10.1016/s0010-2180(03)00137-8

Cited by 62 publications

(39 citation statements)

References 11 publications

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“…Because combustion in a dust cloud is a complex phenomenon in a heterogeneous system, the approaches based on combustion science are necessary and desirable. Recently, some studies have also been done to accumulate basic knowledge of dust explosion phenomena in the sense of the combustion science, such as the structure and propagation mechanisms of particle cloud flames [8][9][10][11][12][13][14].…”

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confidence: 99%

Flame propagation characteristics and flame structures of zirconium particle cloud in a small-scale chamber

Yi-bin

Sun

et al. 2010

Chin. Sci. Bull.

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Flame propagating through zirconium particle cloud in a small-scale vertical rectangle chamber was investigated experimentally.In the experiments, the zirconium quoted 99% purity was used and the diameter of particles was distributed 1-22 μm. The zirconium dust was dispersed into the chamber by air flow and ignited by an electrode spark. A high-speed video camera was used to record the images of the propagating flame. Micro-thermocouples, schlieren optical system and microscopic lens were used to obtain temperature profiles and flame structure, respectively. Based on the experimental results, flame propagation characteristics and flame structure of zirconium particle cloud were analyzed. The propagation velocity of the flame is quite slow in the initial 14 ms and then accelerates to maximum value. Subsequently, the propagation velocity of the flame almost keeps constant. The combustion zone width of zirconium particle cloud is 5-6 mm. Smaller particles burn mainly at the leading edge of combustion zone in the width of 1.4 mm followed by larger particles burning 1.4-6 mm behind the leading edge of the combustion zone. Gas phase flame is not seen in zirconium particle cloud and the combustion time of single zirconium particle is 1-5 ms, which depends on its original size. The preheated zone is 7-8 mm thickness ahead of the combustion zone and intensive chemical reaction takes place at 490 K. The maximum flame temperature increases at lower concentrations, reaches the maximum value, and then decreases slightly at higher concentrations. zirconium particle cloud, propagation characteristics, flame structure, flame temperature Citation:Ding Y B, Sun J H, He X C, et al. Flame propagation characteristics and flame structures of zirconium particle cloud in a small-scale chamber.

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confidence: 99%

Flame propagation characteristics and flame structures of zirconium particle cloud in a small-scale chamber

Yi-bin

Sun

et al. 2010

Chin. Sci. Bull.

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“…The theory is based on the fact that the hydrocarbon produces some medial ion after combustion reaction, such as the H + , OH − and CH 3 − ; thus the fluctuation of ion current shows the reaction intensity and further characterizes the reaction zone structure [28,29] . Therefore, the scheme of ion current probe technology can be used to study the characteristics of combustion reaction zone.…”

Section: Discussion On Ion Current Resultsmentioning

confidence: 99%

“…In this research, the super-thin thermocouples were applied to detecting the temperature profile of combustion reaction zone [29] .…”

Section: Analysis Based On Temperature Resultsmentioning

confidence: 99%

Microstructure of premixed propane/air flame in the transition from laminar to turbulent combustion

et al. 2007

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In order to explore the flame structure and propagation behavior of premixed propane/air in the transition from laminar to turbulent combustion, the high speed camera and Schlieren images methods were used to record the photograph of flame propagation process in a semi-vented pipe. Meanwhile, the super-thin thermocouple and ionization current probe methods were applied to detect the temperature distribution and reaction intensity of combustion reaction. The characteristics of propane/air flame propagation and microstructure were analyzed in detail by the experimental results coupled with chemical reaction thermodynamics. In the test, the particular tulip flame behavior and the formation process in the laminar-turbulent transition were disclosed clearly. From the Schlieren images and iron current results, one conclusion can be drawn that the small-scale turbulent combustion also appeared in laminar flame, which made little influence on the flame shape, but increased the flame thickness obviously.premixed flame, flame structure, Schlieren image, laminar-turbulent transition ENGINEERING THERMOPHYSICS

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“…However, the recent studies on flame propagation behaviors are mostly focused on the micro scale particles. Sun et al [7][8][9] studied the behaviors of particles across upward and downward flame propagating through micro-iron particle clouds and found that for relatively large (agglomerated) particles the number density of iron particles changed with the distance from the leading edge of the combustion zone. And the structure of flames propagating through micro-aluminum particles clouds and combustion processes of the particles were examined to understand the fundamental behaviors of metal dust explosions.…”

Section: Introductionmentioning

confidence: 99%

Combustion behaviors and flame microstructures of micro- and nano-titanium dust explosions

Zhang

et al. 2016

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Concentration profile of particles across a flame propagating through an iron particle cloud

Cited by 62 publications

References 11 publications

Flame propagation characteristics and flame structures of zirconium particle cloud in a small-scale chamber

Flame propagation characteristics and flame structures of zirconium particle cloud in a small-scale chamber

Microstructure of premixed propane/air flame in the transition from laminar to turbulent combustion

Combustion behaviors and flame microstructures of micro- and nano-titanium dust explosions

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