Prediction of flammability limits of fuel-air and fuel-air-inert mixtures from explosivity parameters in closed vessels

Giurcan, Venera; Razus, Domnina; Mitu, Maria; Oancea, Dumitru

doi:10.1016/j.jlp.2015.01.025

Cited by 40 publications

(12 citation statements)

References 24 publications

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“…Maximum explosion pressure was an important index to measure explosion power Figure exhibits the variation of the peak overpressure with the ignition position.…”

Section: Resultsmentioning

confidence: 99%

Experimental Studies on the Explosion Behaviors of Premixed Hydrogen–Air Mixtures in a Narrow Channel

Zhang

Wen

et al. 2022

ACS Omega

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Premixed hydrogen–air explosion experiments were carried out in a 1000 mm × 50 mm × 10 mm half-open narrow channel, concerning with the influences of equivalence ratio and ignition position on explosion behaviors. Experimental phenomena were different from explosion in large space. The results indicated that when ignited at the closed end of the channel, three overpressure peaks appeared, caused by the rupture of the film, Helmholtz Oscillation, and the flame-acoustic interaction, respectively. As the equivalence ratio of the hydrogen–air mixtures varied from 0.6 to 1.6, the peak overpressure first increased and then decreased. The maximum peak overpressure occurred at ϕ = 1.2. The hydrogen flame would develop into the plane tulip structure without the influence of the end wall. With the ignition position moved to the open end, overpressure wave and flame oscillated significantly. Compared with other ignition positions, the minimum value of P max was obtained at IP 950 . Based on the explosion behaviors in the narrow channel, it was concluded that the closer the ignition was to the open end, the easier the oscillation was to be formed, the smaller the explosion hazard was.

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“…Maximum explosion pressure was an important index to measure explosion power Figure exhibits the variation of the peak overpressure with the ignition position.…”

Section: Resultsmentioning

confidence: 99%

Experimental Studies on the Explosion Behaviors of Premixed Hydrogen–Air Mixtures in a Narrow Channel

Zhang

Wen

et al. 2022

ACS Omega

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“…A schematic diagram of the experimental setup is shown in Figure . Other details were previously given. − …”

Section: Methodsmentioning

confidence: 99%

Influence of Initial Pressure and Vessel’s Geometry on Deflagration of Stoichiometric Methane–Air Mixture in Small-Scale Closed Vessels

et al. 2020

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In the present work, experimental data on closed vessel explosions of stoichiometric methane–air mixture are reported for mixtures at ambient initial temperature and various initial pressures between 0.2 and 1.2 bar for small-scale closed vessels. The data are collected as pressure–time records in a spherical vessel and two cylindrical vessels with central ignition. The influence of initial pressure and vessel size and shape on maximum rates of pressure rise and deflagration (severity) indices is examined. In each explosion vessel, a linear correlation of the maximum rate of pressure rise with the initial pressure is found. At all pressures, the rates of pressure rise and the severity factors reached in the spherical vessel exceed those reached in cylindrical vessels as a result of differences in heat losses within these enclosures. The experimental deflagration indices are compared with the adiabatic deflagration indices, calculated by means of peak explosion pressures and laminar burning velocities; the heat losses in various enclosures explain the observed differences. The peak explosion pressures and laminar burning velocities are also used to calculate the dimensionless deflagration indices, found to be less influenced by vessel’s size and shape.

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“…The signals from the ionization probe and from the Charge Amplifier were recorded with an acquisition data system TestLab TM Tektronix 2505, by means of an acquisition card type AA1, usually at 7000 signals/s. Other details regarding the experimental set-up and the operating mode were previously given [7,9,[25][26][27].…”

Section: Experimental Partmentioning

confidence: 99%

Experimental Study and Kinetic Modeling of Laminar Flame Propagation in Premixed Stoichiometric n-butane-air Mixture

Giurcan¹,

Mitu²,

Razus³

et al. 2019

Rev. Chim.

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The laminar burning velocities and propagation speeds of stoichiometric n-butane-air mixture were obtained for outwardly propagating spherical flames by measurements of pressure rise during the early stage of propagation in a spherical vessel. The experiments were carried out at various initial pressures within 0.3 and 1.2 bar, and various initial temperatures within 298 and 423 K. The experimental laminar burning velocities were compared with those provided by the detailed kinetic modelling based on Warnatz mechanism for combustion of C1-C4 hydrocarbons, using INSFLA package. The baric and thermal coefficients of laminar burning velocities, calculated from their dependence on initial temperature and pressure, were compared with coefficients characteristic for other fuel-air mixtures. The overall activation parameters (reaction order and activation energy) are reported and discussed in comparison with similar data characteristic for alkane-air flames.

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Prediction of flammability limits of fuel-air and fuel-air-inert mixtures from explosivity parameters in closed vessels

Cited by 40 publications

References 24 publications

Experimental Studies on the Explosion Behaviors of Premixed Hydrogen–Air Mixtures in a Narrow Channel

Experimental Studies on the Explosion Behaviors of Premixed Hydrogen–Air Mixtures in a Narrow Channel

Influence of Initial Pressure and Vessel’s Geometry on Deflagration of Stoichiometric Methane–Air Mixture in Small-Scale Closed Vessels

Experimental Study and Kinetic Modeling of Laminar Flame Propagation in Premixed Stoichiometric n-butane-air Mixture

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