Experimental study of detonation limits in methane-oxygen mixtures: Determining tube scale and initial pressure effects

Zhang, Bo; Liu, Hong; Yan, Bingjian; Ng, Hoi Dick

doi:10.1016/j.fuel.2019.116220

Cited by 84 publications

(18 citation statements)

References 58 publications

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“…However, it could not reach the third vertical branch, not to mention the right end of the horizontal pipe (Figure 8D). A similar phenomenon was also observed by Wan et al [ 16 ] Thus, the more vertical branches in the pipeline, the more significant the overall downward trend of flame propagation velocity in the horizontal pipe. This, together with the data in Figure 7, indicated that the flame propagation velocity at test point below the first vertical branch in every model increased to different degrees.…”

Section: Resultssupporting

confidence: 84%

“…The prediction had reasonable accuracy and the MF model provided reference for taking safety protections and precautions in industrial chemical processes and for developing new‐concept detonation engines. Furthermore, detonation limits in stoichiometric methane‐oxygen mixtures with varying tube inner diameter and initial mixture pressure were investigated, and the relation between the near‐limit detonation dynamics, the tube geometry, and the thermodynamic properties of the mixture was revealed 16 .…”

Section: Introductionmentioning

confidence: 99%

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Influence of branch pipes on the deflagration characteristics of methane in confined space

Zhang

et al. 2020

Process Safety Progress

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To investigate the deflagration characteristics of CH4‐air mixture in confined space, fluid dynamic software Fluidyn was used to build numerical models that each consisted of a horizontal pipe and vertical branches to study the influence of different numbers of branch pipes on the deflagration propagation characteristics of CH4. Research findings suggested that the oscillation trend of the time history curve of pressure at the test point weakened and the peak initial deflagration pressure attenuated in an approximately linear manner with the increase of the propagation distance in the horizontal pipe. With the increase of the number of branches, the peak initial deflagration pressure at the same test point declined with an increasing amplitude. The vertical branch was found to have both “boosting” and “inhibiting” effects on flame propagation. And the inhibiting effect dominated as the number of vertical branches increased, which caused the flame propagation velocity within the horizontal pipe to significantly attenuate. In addition, the functions of the peak initial deflagration pressure varying with the number of branches and propagation distance in the horizontal pipe were obtained by fitting. According to the functions, the vertical branch had marked pressure venting effect on deflagration pressure in the horizontal pipe; the more the branch pipes were, the more significant the pressure venting effect was.

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Section: Resultssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Influence of branch pipes on the deflagration characteristics of methane in confined space

Zhang

et al. 2020

Process Safety Progress

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“…At the same time, the reverse flow occurred before the location of the secondary cusps, thus promoting the growth of the cusps. The combined action of the overpressure wave and the curved flame front had a destabilization effect and promoted forming the distorted tulip flame by triggering Rayleigh-Taylor instability [28].…”

Section: Influence Of Different Opening Ratio On Overpressurementioning

confidence: 99%

The joint influence of the hydrogen additions and the opening ratios on the propagation dynamics of premixed syngas/air flame

et al. 2021

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To further understand the combustion characteristics of syngas/air, the behaviors of premixed flame at various hydrogen additions and opening ratios were investigated. The combustion vessel is a half-open rectangular duct 50mm square by 900mm long. The shape of the flame is photographed by a high-speed camera and the pressure is measured by a pressure sensor at the closed end of the duct. The effect of the two variables on the flame dynamics are considered through the analysis of the flame shape evolution and the overpressure oscillation. The results show that the tulip flame appeared earlier and the overpressure peak reach the maximum under the condition of 30% hydrogen fraction; with increasing of the opening ratio, the tulip flame appeared later and the overpressure peak gradually decreased. Under the experimental conditions of the opening with the increase of the volumes of hydrogen blend ratio, the overpressure peak increased systematically, but the occurrence time fluctuated. The results show that the influence of the opening ratio and the hydrogen blend ratio pressures is mainly impacted when the hydrogen blend ratio is at least 30%,with a 0.25 opening ratio. At these critical parameters, the overpressure peak reaches a maximum of 0.9bar;when the opening ratio is 0.5, the overpressure peak suddenly dropped to 0.39bar.

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“…The mixed fuels consisting of combustible liquid, solid, or gas are commonly used in industry. Research studies about the explosion of mixed fuels mainly focus on the development and the severity of the explosion. − Compared with simple fuels, there have been only fewer studies on the explosion behavior of solid–liquid mixtures in air. In recent years, the interaction between the components of mixed fuels has received increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Explosion Characteristics of an Aluminum Dust–Diethyl Ether–Air Mixture

et al. 2021

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In this work, the explosion characteristics of an aluminum (Al)–diethyl ether (DEE)–air mixture were investigated in a 20 L spherical vessel. The effect factors of the explosion characteristics considered were fuel concentration, component proportion, and ignition energy. With the increasing concentration of the mixed fuel (Al/DEE = 1:1), the maximum pressure (P max), the maximum rate of pressure rise ((dP/dt)max), and the flame propagation speed (νF) exhibit an inversely “U-shaped” curve. The maximum P max, (dP/dt)max, and νF values are 901.2 kPa, 148.3 MPa/s, and 15.3 m/s, respectively, corresponding to an optimum concentration of 600 g/m3. The P max, the (dP/dt)max, and the νF increase with the addition of DEE when the proportion of DEE is below 55% but have a decrease tendency when the proportion of DEE is over 55%. As the explosions of Al and DEE were mutually promoting, the studied explosion characteristics of the Al–DEE–air mixture are obviously higher than those of pure Al or DEE in air. The minimum ignition energy (MIE) of the Al–DEE–air mixture is 1.9 mJ, between the MIE of Al and DEE. With the increase of ignition energy, P max, (dP/dt)max, and νF all increase, while the minimum explosion concentration presents a linear decreasing trend. This work could provide significant scientific evidence for evaluating the explosion risk of the Al–DEE–air mixture.

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Experimental study of detonation limits in methane-oxygen mixtures: Determining tube scale and initial pressure effects

Cited by 84 publications

References 58 publications

Influence of branch pipes on the deflagration characteristics of methane in confined space

Influence of branch pipes on the deflagration characteristics of methane in confined space

The joint influence of the hydrogen additions and the opening ratios on the propagation dynamics of premixed syngas/air flame

Investigation on the Explosion Characteristics of an Aluminum Dust–Diethyl Ether–Air Mixture

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