Initial stage of gas combustion in a closed volume

Babkin, V. S.; Babushok, Valeri I.

doi:10.1007/bf00756011

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…Additionally, the pressure change in the course of this incipient period is useful for the design of venting devices, necessary for the mitigation of gaseous explosions which may occur accidentally in industrial installations or storage reservoirs. One of the conditions for a good work of vents is that the operating time of the suppression system must be lower than the induction period (the time required for the allowable pressure increase) [27]. In the incipient stage of flame development, the flame is smooth, has a negligible width and propagates in the absence of convection [28,29].…”

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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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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“…The approximate relationship described by Lewis & von Elbe (1961) was recovered when the ratios of the specific heats were equal. Babkin & Babushok (1977) used the expression developed by Lewis & von Elbe (1961) to study the time for pressure rise in explosion development from partial combustion in vessels of arbitrary shape. Because Babkin and Babushok incorporated Lewis and von Elbe's model in their model for combustion time, the model was limited to burned and unburned gases with equal ratios of specific heats.…”

Section: Introductionmentioning

confidence: 99%

Pressure rise generated by the expansion of a local gas volume in a closed vessel

et al. 2009

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Experiments were conducted to determine the pressure rise that results from either the combustion of a localized gas volume or the expansion of a pressurized gas volume adjacent to an inert gas in a closed vessel. The experiments consisted of either pressurized air or the combustion of stoichiometric and fuel-lean hydrogen-air mixtures compressing an inert gas. The pressure rise in the inert gas was measured as a function of either the volume fraction or the initial pressure of the expanding gas. Helium, nitrogen, air and carbon dioxide were tested to explore the effect of inert gas heat capacity on the pressure rise. The final pressure of the inert gas increased with the volume fraction and initial pressure of the expanding gas, and was influenced to a lesser extent by the heat capacity of the inert gas. A model was assessed using the experimental data, and the theoretical results were consistent with the observed trends. This model and other published models were assessed and compared using prior data for localized gas combustion surrounded by an inert gas and the partial combustion of homogeneous methane-air mixtures.

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