Numerical and experimental study of the explosion pressures and flammability limits of lower alkenes in nitrous oxide atmosphere

Koshiba, Yusuke; Hasegawa, Takashi; Ohtani, Hideo

doi:10.1016/j.psep.2018.06.024

Cited by 18 publications

(14 citation statements)

References 28 publications

(23 reference statements)

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“…Several studies were conducted in the past to provide information on explosions in fuel-N 2 O mixtures. Some authors [6][7][8][9][10][11][12][13][14][15] reported the explosion parameters such as the flammability limits, the maximum explosion pressures, the explosion times, or the deflagration indices for explosions occurring in closed cells in the presence of N 2 O as oxidizer. The laminar combustion velocity of fuel-N 2 O and fuel-N 2 O-diluent mixtures (fuels: NH 3 , CO, H 2 , C 2 H 4 and C 2 H 2 ) was investigated mainly by burner method [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Propagation of CH4-N2O-N2 Flames in a Closed Spherical Vessel

et al. 2021

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Flammable fuel-N2O mixtures raise safety and environmental protection issues in areas where these mixtures are used (such as: industry, research, internal combustion engines). Therefore, it is important to know their laminar combustion velocities and propagation speeds—important safety parameters for design of active protection devices against gas explosions and corresponding safety recommendations. In this paper, the laminar combustion velocities of N2-diluted CH4-N2O flames, obtained in experiments on outwardly propagating flames, at various initial pressures (within 0.5–2.0 bar) and room temperature, are reported. The experiments were made in a 0.5 L spherical cell with central ignition. The laminar combustion velocities were calculated from the constants of cubic law of flame propagation during the early stage of closed cell explosions and the expansion coefficients of unburned flammable mixtures, using the adiabatic model of the flame propagation. The expansion coefficients were determined from equilibrium calculations on flames propagating under isobaric conditions. The laminar combustion velocities were compared with data reported in the literature. Using the laminar combustion velocities and the expansion coefficients, the propagation speeds of N2-diluted CH4-N2O flames were calculated. Both laminar combustion velocities and propagation speeds decrease with the initial pressure increase.

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Section: Introductionmentioning

confidence: 99%

Propagation of CH4-N2O-N2 Flames in a Closed Spherical Vessel

et al. 2021

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“…Mével et al [10] carried out experimental studies in a spherical bomb and kinetic modeling at ambient conditions to study the flame propagation in H 2 -N 2 O-Ar mixtures. Koshiba et al [11][12][13] studied the explosion properties (explosion limits, peak explosion pressures, and time to peak explosion pressure) of mixtures of n-alkanes, diethyl ether, diethylamine and nbutyraldehyde with nitrous oxide and nitrogen in a cylindrical vessel, at room temperature and atmospheric pressure. Bane et al [14] determined the flame velocities and combustion parameters (peak explosion pressure and severity factor) for the H 2 -N 2 O mixture diluted or not with N 2 by experiments in a cylindrical bomb and numerical modeling, at different initial conditions (pressure, equivalence ratio, dilution level).…”

Section: Introductionmentioning

confidence: 99%

Deflagration Characteristics of N2-Diluted CH4-N2O Mixtures in the Course of the Incipient Stage of Flame Propagation

2021

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In this study, experimental measurements in a spherical combustion bomb were performed in order to investigate the flame propagation in N2-diluted CH4-N2O mixtures with stoichiometric equivalence ratio, at several initial pressures (0.5–1.75 bar) and ambient initial temperatures. Methane was chosen as a test-fuel, since it is the main component of natural gas, a fuel often used as a substitute to gasoline in engines with internal combustion and industrial plants. The method approached in this study is based on a simple examination of the cubic law of pressure rise during the early (incipient) period of flame propagation. The incipient stage defined by a pressure rise equal or smaller than the initial pressure, was divided into short time intervals. The burnt mass fractions (obtained using three different Equations) and flame radii at various moments of the flame propagation in the course of the incipient stage were calculated. The cubic law coefficients and corresponding laminar burning velocities at considered time intervals were also reported.

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“…Its coefficient of oxygen equivalency is 0.42 (compared to 0.21 for air and 1 for pure oxygen) 25 . Compared to air, N 2 O leads to a widening of the explosion regions, 26‐31 higher explosion pressures and rates of pressure rise, 31 lower maximum experimental safe gap values, 30 and eases deflagration‐to‐detonation transition 32 . At temperatures above 580°C or elevated pressures nitrous oxide decomposes to oxygen and nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Ignition temperature of combustible liquids in mixtures of air with nitrous oxide

et al. 2021

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Summary While ignition temperatures in the air are well known for a large number of flammable substances and to a lesser extent in pure oxygen too, no such values exist for ignition temperatures in nitrous oxide in spite of the fact that nitrous oxide is used as oxidizer in combustion processes or aerosol propellant in industry. The ignition temperatures of some pure compounds have now been investigated in oxidizer mixtures of nitrous oxide and air with varying concentration of nitrous oxide up to 80 vol% using a slightly modified standardized apparatus. The ignition temperature increases with increasing nitrous oxide concentration. Up to 580°C, none of the investigated substances ignited in pure nitrous oxide.

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Numerical and experimental study of the explosion pressures and flammability limits of lower alkenes in nitrous oxide atmosphere

Cited by 18 publications

References 28 publications

Propagation of CH4-N2O-N2 Flames in a Closed Spherical Vessel

Propagation of CH4-N2O-N2 Flames in a Closed Spherical Vessel

Deflagration Characteristics of N2-Diluted CH4-N2O Mixtures in the Course of the Incipient Stage of Flame Propagation

Ignition temperature of combustible liquids in mixtures of air with nitrous oxide

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