Study of Gas Combustion in a Vented Cylindrical Vessel

Hu, Jibin; Pu, Yunfei; Fu, Jia; Jarosiński, Józef

doi:10.1080/00102200590900499

Cited by 9 publications

(6 citation statements)

References 14 publications

(16 reference statements)

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“…5 originate from different vessels, a near linear correlation is observed between the maximum effective burning velocity and the turbulence intensity at the time of ignition. The results resemble those of previous investigations (Chomiak & Jarosinski, 1982) and recent experiments (Hu et al, 2005) for gaseous fuel-air mixture with smallscale turbulence. …”

Section: Resultssupporting

confidence: 82%

“…Visual observations by Ellis (1928) and Hu, Pu, Jia, and Jarosinski (2005), as well as pressure-time traces (Pu, 1987;Pu et al, 2000Pu et al, , 1990Pu et al, , 1988Pu et al, , 1993 and direct wall heat transfer measurements (Pu, 1987), suggest that combustion process in closed vessels can be divided into two subprocesses: an initial adiabatic process, followed by a nonadiabatic process. The thermodynamic analysis used to determine the value of the maximum effective burning velocity by Eq.…”

Section: Combustion Processes In Spherical and Cylindrical Closed Vesmentioning

confidence: 99%

“…Fig. 3 shows the relationship between the aspect ratio of a cylindrical vessel and the value of the corresponding L eff obtained by Ellis (1928), and one experimental point obtained by Hu et al (2005). …”

Section: Combustion Processes In Spherical and Cylindrical Closed Vesmentioning

confidence: 99%

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Determination of the maximum effective burning velocity of dust–air mixtures in constant volume combustion

Wang

et al. 2007

Journal of Loss Prevention in the Process Industries

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The reactivity of a combustible dust cloud is traditionally characterized by the so-called K St value, defined as the maximum rate of pressure rise measured in constant volume explosion vessels, multiplied with the cube root of the vessel volume. The present paper explores the use of an alternative parameter, called the maximum effective burning velocity (u eff,max ), which also is derived from pressure-time histories obtained in constant volume explosion experiments. The proposed parameter describes the reactivity of fuel-air mixtures as a function of the dispersion-induced turbulence intensity. Procedures for estimating u eff,max from tests in both spherical and cylindrical explosion vessels are outlined, and examples of calculated values for various fuel-air mixtures in closed vessels of different sizes and shapes are presented. Tested fuels include a mixture of 7.5% methane in air, and suspensions of 500 g/m 3 cornstarch in air and 500 g/m 3 coal dust in air. Three different test vessels have been used: a 20-l spherical vessel and two cylindrical vessels, 7 and 22 l. The results show that the estimated maximum effective burning velocities are less apparatus dependent than the corresponding K St values. r

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Section: Resultssupporting

confidence: 82%

Section: Combustion Processes In Spherical and Cylindrical Closed Vesmentioning

confidence: 99%

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Determination of the maximum effective burning velocity of dust–air mixtures in constant volume combustion

Wang

et al. 2007

Journal of Loss Prevention in the Process Industries

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“…The effective overpressure DP ¼ 150 kPa is stronger than Bartknecht's (1978) experimental results for comparable volumes (about 10% of overpressure) but remains consistent with results obtained by Hu et al (2005) for gaseous mixtures in partitioned vessels.…”

Section: Partitioning Effect On a Dust Explosion 1621supporting

confidence: 86%

“…The physical processes involved in the ignition and propagation of the combustion of dust suspensions in such structures are generally complex (Di Benedetto and Russo, 2007) and the theoretical predictions often remain limited with long calculation times. It has been experimentally verified for gaseous mixtures that very important overpressures went on in all the adjoining areas of the ignition compartment for a multipartitioned vessel (Fairweather and Vasey, 1998;Hu et al, 2005). I now clarify the existence of such phenomena in the case of dust explosions.…”

Section: Introductionmentioning

confidence: 89%

Partitioning Effect on a Dust Explosion

Pascaud

2010

Combustion Science and Technology

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The aim of this work is to verify the partitioning effect on the chain propagation of a dust explosion and the formation of overpressures inside a partitioned vessel. A calculation methodology, particularly interesting in the field of the risk assessment is developed to simulate the transmission of the explosion from one compartment to another adjacent compartment by means of the hot flow through the shared orifice and finally to generalize this methodology to a complex multipartitioned structure. The basic characteristics of the model have been developed for the ignition and combustion of propulsive powders and adapted to dust suspensions with appropriate parameters linked to simplified kinetics. A simple representation of the combustion phenomena based on energy transfers and the action of specific molecular species is presented. The model allows the study of various parameters such as the initial thermodynamical conditions, the size of the inner openings or the vent areas and finally the location of the ignition energy and of overpressures inside the structure. The calculations have been compared with experimental data available for usual dust suspensions and indicate correct preliminary tendencies.

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