Journal ArticleDOI
Effects of obstacles and deposited coal dust on characteristics of premixed methane–air explosions in a long closed pipe
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TLDR
An experimental system including pressure transducer, electric spark ignition device, data acquisition and control unit was set up to investigate methane-air explosions in a horizontal pipe closed at both ends with or without the presence of obstacles and deposited coal dust as discussed by the authors.About:
This article is published in Safety Science.The article was published on 2012-11-01. It has received 51 citations till now. The article focuses on the topics: Coal dust & Overpressure.read more
Citations
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Suppression of methane/air explosion by ultrafine water mist containing sodium chloride additive
TL;DR: Results indicate that addition of NaCl can improve the suppression effect of ultrafine pure water mist on the methane explosions, and the suppressed effect is considered due to the combination effect of physical and chemical inhibitions.
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Numerical study on dust movement and dust distribution for hybrid ventilation system in a laneway of coal mine
TL;DR: Wang et al. as discussed by the authors presented a special topic on systematic study of the variation regularity of dust movement and dust distribution with hybrid ventilation for the comprehensive mechanized heading face: Euler-Euler method was firstly established on the numerical platform for gas-solid two phase flow in a laneway.
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Numerical investigation of dust dispersion in a coal roadway with hybrid ventilation system
TL;DR: Wang et al. as discussed by the authors investigated coal dust explosion in underground coal mines based on Euler-Euler and the Euler Lagrange methods, and the results showed reasonable agreement with relatively few results from the previous experiments and the relevant survey.
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Prediction of air flow, methane, and coal dust dispersion in a room and pillar mining face
TL;DR: In this paper, the authors used a computational fluid dynamics (CFD) approach to evaluate the effect of the presence of continuous miner on the air flow and showed that such negative effect can be minimized or even neutralized by operating the scrubber fan in suction mode.
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Explosion energy of methane/deposited coal dust and inert effects of rock dust
TL;DR: In this article, the authors study the processes of lifting, dispersing and igniting of a dust layer behind the local gas explosion as well as their suppression, premixed methane local explosion igniting deposited coal/inert rock dust at the bottom of a tube are simulated.
References
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Journal ArticleDOI
On the "Tulip Flame" Phenomenon
TL;DR: In this article, the authors present an experimental study of the tulip flame phenomenon using high-speed photography in a simplified quasi-constant pressure configuration in a half-open tube and show that the salient features of different stages of the flame propagation and shape can be explained by a simple geometrical model of the interaction between the flame front and the gas dynamics.
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Flame acceleration due to turbulence produced by obstacles
TL;DR: In this paper, the influence of obstacles on the propagation of cylindrical flames is investigated and it is found that the flame speed depends critically on the obstacle configuration and flame speeds up to 130 m/sec in stoichiometric methane-air mixtures are readily achieved by placing appropriate turbulence producing obstacles in the flame path.
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The effects of obstructions on overpressure resulting from premixed flame deflagration
Salah Ibrahim,Assaad R. Masri +1 more
TL;DR: In this article, the effects of obstruction geometry, blockage ratio and venting pressure on overpressures resulting from premixed flame deflagration were investigated, and it was found that the deflagation overpressure increases with increasing ventingpressure.
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Visualization of the unburned gas flow field ahead of an accelerating flame in an obstructed square channel
TL;DR: The effect of blockage ratio on the early phase of the flame acceleration process in an obstructed square cross-section channel was investigated in this paper, and it was determined that flame acceleration is more pronounced for higher blockage obstacles during the initial stage of flame acceleration up to a flame velocity below the speed of sound of the reactants.
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Influence of ignition position and obstacles on explosion development in methane–air mixture in closed vessels
TL;DR: In this paper, an experimental study of influence of the ignition position and obstacles on explosion development in premixed methane-air mixtures in an elongated explosion vessel was presented. But the authors did not consider the impact of obstacles on the course of pressure.