Flame behaviors and pressure characteristics of vented dust explosions at elevated static activation overpressures

Yan, Xingqing; Yu, Jianliang; Gao, Wei

doi:10.1016/j.jlp.2014.11.012

Cited by 35 publications

(4 citation statements)

References 20 publications

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“…The vented external flames of gases (Daubech et al, 2013;Rocourt et al, 2014;Molkov et al, 2006) and dusts (Castellanos et al, 2013;Yan et al, 2015) have been experimentally and numerically investigated. In current experiments, external flames can hardly be observed for  = 0.4 and 0.6 owing to low flame luminosity, and typical flame images of the external flames recorded by a high-speed camera are presented in Fig.…”

Section: Propagation Of External Flamementioning

confidence: 99%

Experiments on vented hydrogen-air deflagrations: The influence of hydrogen concentration

Guo

Liu

Wang

2017

Journal of Loss Prevention in the Process Industries

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The explosion venting of hydrogen-air mixtures with equivalence ratios ranging from 0.4 to 6.0 was investigated in a small vented cylindrical vessel. The experimental results show that the maximum internal overpressure initially increases with an increase in hydrogen equivalence ratio up to approximately 1.6 and subsequently decreases. The discrepancy between the maximum internal overpressure and the vent burst pressure is significantly high for equivalence ratios ranging from 1.0 to 2.0 but low for very lean or very rich mixtures. Buoyancy has a significant effect on the evolution of the internal flame bubble for very lean hydrogen-air mixtures only. The speed of the external flame oscillates violently and its maximum value is achieved at a distance downstream from the vent. The maximum length of the flame ejected from the vent, which depends on the hydrogen equivalence ratio, may be underestimated by engineering models.

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Section: Propagation Of External Flamementioning

confidence: 99%

Experiments on vented hydrogen-air deflagrations: The influence of hydrogen concentration

Guo

Liu

Wang

2017

Journal of Loss Prevention in the Process Industries

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“…However, the existing research works have not paid enough attention to the explosion flame propagation characteristics under pressure accumulation, which makes it impossible to accurately and comprehensively describe the flame propagation mechanism(s) in the real explosion process. Various studies have shown that explosion pressure significantly affects the flame propagation behavior, such as flame thickness and propagation velocity, thereby affecting the flame propagation mechanism(s) [27][28][29][30]. In addition, due to the confinement of the closed space wall, the product of the high temperature and high pressure produced by the explosion process cannot be released in time.…”

Section: Introductionmentioning

confidence: 99%

Flame Propagation Characteristics of Hybrid Explosion of Ethylene and Polyethylene Mixture under Pressure Accumulation

Yang

et al. 2022

Energies

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In order to study the flame propagation characteristics of a ethylene/polyethylene hybrid explosion under pressure accumulation, a visual pressure-bearing gas/power hybrid-explosion experimental platform was built. The flame propagation characteristics of polyethylene and ethylene/polyethylene hybrid explosions in the closed vessel were analyzed. The results show that the flame brightness, flame front continuity and average flame propagation velocity of polyethylene dust explosion in the closed vessel increased first and then decreased when the polyethylene dust concentration increased. The curve of the flame propagation velocity with time had obvious pulsation characteristics. Adding 1% and 3% ethylene to different concentrations of polyethylene dust significantly improved its explosion flame brightness, flame front continuity and average flame propagation velocity. Moreover, it also improved the fluctuation amplitude of the explosion flame propagation velocity with time curve. The explosion flame of the polyethylene dust and ethylene/polyethylene hybrid mixture included four zones during the propagation process, which were denoted as the unburned zone, preheated zone, premixed flame zone and dust flame zone. The addition of ethylene to polyethylene dust can significantly increase its thickness of premixed flame zone and preheated zone, and the thickness increased when the ethylene concentration increased.

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“…With respect to the conventional ductless explosion venting method, many studies have been performed to investigate how the internal pressure of the vessel is affected by different explosion venting parameters such as the ignition positions (Eckhoff et al, 1988), vent diameter (Tascón et al, 2016 andGao et al, 2015), and opening pressure Aguado, 2017 andGao et al, 2016). Yan et al (2015) performed a dust explosion experiment in a 20 L spherical explosion test device and analyzed the effects of the vent diameter and opening pressure on the occurrence of a secondary explosion. The results of their study showed that a secondary explosion likely occurs when the area of the explosion vent port is larger and the opening pressure of the explosion vent is smaller.…”

Section: Introductionmentioning

confidence: 99%

Influence of elevated temperature on properties of radiation shielding concrete with electric arc furnace slag as coarse aggregate

Beaucour

Pliya

Faleschini

et al. 2020

Construction and Building Materials

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Flame behaviors and pressure characteristics of vented dust explosions at elevated static activation overpressures

Cited by 35 publications

References 20 publications

Experiments on vented hydrogen-air deflagrations: The influence of hydrogen concentration

Experiments on vented hydrogen-air deflagrations: The influence of hydrogen concentration

Flame Propagation Characteristics of Hybrid Explosion of Ethylene and Polyethylene Mixture under Pressure Accumulation

Influence of elevated temperature on properties of radiation shielding concrete with electric arc furnace slag as coarse aggregate

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