Experimental study on vented gas explosion in a cylindrical vessel with a vent duct

Kasmani, Rafiziana Md.; Andrews, Gordon E.; Phylaktou, Herodotos N.

doi:10.1016/j.psep.2012.05.006

Cited by 112 publications

(28 citation statements)

References 16 publications

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“…shows the results computed using the above equations and the experimental data Vent burst pressure (kPa) Comparison of the computed and tested values of overpressureFig. 6shows that for low vent burst pressures, equation (1) provides reliable predictive results for P red , which is also predicted well by equation(2) in all cases examined here.3.3 Flame behavior inside the vesselTypical internal flame photos corresponding to different pressure peaks for the cases of and are shown in Fig. 7.…”

mentioning

confidence: 65%

“…where is the ratio of the vent area to the total surface area of the vessel, and is the ratio of the gas velocity ahead the initial flame front to the acoustic velocity of the unburnt gas. Rasbash [37,38] concludes the maximum reduced explosion overpressure has a linear relationship with the vent burst pressure as in equation (2). .…”

Section: Maximum Reduced Overpressurementioning

confidence: 99%

“…In addition, they found that the time interval between the two pressure transients decreased as the vent failure pressure increased. Kasmani et al [2,3] investigated explosion venting using propane air and methane air mixtures with equivalence ratios ranging from 0.8 to 1.6 in a 0.2 m 3 cylindrical vessel. Their findings showed that the maximum pressure does not increase monotonically with the vent failure pressure under central and rear ignition.…”

Section: Introductionmentioning

confidence: 99%

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The effect of vent burst pressure on a vented hydrogen–air deflagration in a 1 m3 vessel

Rui

Guo

et al. 2018

International Journal of Hydrogen Energy

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A series of experiments are conducted to investigate the effect of vent burst pressure on stoichiometric hydrogen air premixed flame propagation and pressure history in a 1 m 3 rectangular vessel in this paper. Pressure buildup and flame evolution are recorded using piezoelectric pressure transducers and a high-speed camera, respectively. The results show typical pressure peaks of three different mechanisms for all vent burst pressures in the experiments. The first pressure peak, generated by the rupture of the vent cover, increases with the vent failure pressure, with the subsequent outflow inertia of combustion products giving rise to a negative pressure. The second pressure peak results from the constant bulk motion of the flame bubble (the Helmholtz oscillation), and the third is produced by the interaction between the combustion waves and the acoustic waves. The time interval between the first pressure peak and the second pressure transient remained nearly constant. The Helmholtz oscillation always appears as the vent ruptures and its magnitude increases with the vent burst pressure. Furthermore, the lower the vent failure pressure, the longer the Helmholtz oscillation is sustained. The peak of the acoustically enhanced pressure always occurs within several milliseconds of the flame front to nship between the maximum reduced explosion overpressure and the vent burst pressure precisely. Also, it is observed that the maximum lengths of the external flames were found to be nearly identical in all tests, but the average propagation rate of the flame front increases with the vent burst pressure. It is interesting that a phenomenon of intense oscillation of internal flame bubble was observed with the increase of vent burst pressure.

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confidence: 65%

Section: Maximum Reduced Overpressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of vent burst pressure on a vented hydrogen–air deflagration in a 1 m3 vessel

Rui

Guo

et al. 2018

International Journal of Hydrogen Energy

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“…Duct-vented hydrocarbon air mixtures have been investigated extensively [3][4][5][6][7][8], and it has been reported that duct length is one of the most important factors affecting the explosion venting process [9][10][11][12][13][14]. Experiments on explosion venting of 9.5% methane air mixtures through ducts with length of 10.5, 30, and 50 cm were performed in two cubical explosion vessels with side of 18 and 38 cm by McCann et al [9].…”

Section: Introductionmentioning

confidence: 99%

Duct-vented hydrogen–air deflagrations: The effect of duct length and hydrogen concentration

Yang

Guo

Wang

et al. 2018

International Journal of Hydrogen Energy

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Experiments on duct-vented explosions of hydrogen air mixtures in a 12.3 l cylindrical vessel were conducted, and the effects of duct length and hydrogen concentration on the maximum overpressure and flame behavior within and outside the vented enclosure were investigated. The results show that the maximum overpressure in the vessel first increased and then was maintained nearly unchanged with the length of a relief duct increasing to 2 m. For a given duct length, the maximum overpressure first increased and then decreased when hydrogen concentration increased from 20% to 55%. The burn-up in the duct caused the gas mixtures to move in reverse from the duct to vessel, which consequently decreased the venting efficiency. A pressure wave caused by burn-up in the duct was observed, which resulted in a pressure peak in the external pressure time histories after it traveled outside the duct. The maximum external overpressure first increased and then decreased with an increase in duct length. For a given duct length, the maximum external overpressure increased with an increase in hydrogen concentration.

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“…Fakandu et al [6] investigated the effect of vent burst pressure on vented gas explosion pressure in a 10 L cylindrical vessel. Kasmani et al [7] conducted explosion venting tests in a 0.2 m 3 cylindrical vessel to investigate the effects of vent activation pressure and ignition location on the maximum overpressure and flame speed. Pu [8] conducted explosion venting tests to analyze the influences of dispersion-induced turbulence and obstacles on 2 Mathematical Problems in Engineering the flame propagation in vessels with volume and length-todiameter ratio varied.…”

Section: Introductionmentioning

confidence: 99%

CFD Simulations to Study Parameters Affecting Gas Explosion Venting in Compressor Compartments

Cen

Song

Huang

et al. 2017

Mathematical Problems in Engineering

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In this work, a series of vented explosions in a typical compressor compartment are simulated using FLACS code to analyze the explosion venting characteristics. The effects of relevant parameters on the pressure peaks (i.e., overpressure and negative pressure) are also numerically investigated, including vent area ratio of the compressor compartment, vent activation pressure, mass per unit area of vent panels, and volume blockage ratio of obstacles. In addition, the orthogonal experiment design and improved grey relational analysis are implemented to evaluate the impact degree of these relevant parameters. The results show that the pressure peaks decrease with the increase of vent area ratio. There is an approximately linearly increasing relationship between the pressure peaks and the vent activation pressure. The pressure peaks increase with the mass per unit area of vent panels. The pressure peaks increase with the volume blockage ratio of obstacles. Based on the grey relational grade values, the effects of these relevant parameters on the overpressure peak are ranked as follows: volume blockage ratio of obstacles > vent activation pressure > vent area ratio > mass per unit area of vent panels. These achievements provide effective guidance for the venting safety design of gas compressor compartments.

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Experimental study on vented gas explosion in a cylindrical vessel with a vent duct

Cited by 112 publications

References 16 publications

The effect of vent burst pressure on a vented hydrogen–air deflagration in a 1 m3 vessel

The effect of vent burst pressure on a vented hydrogen–air deflagration in a 1 m3 vessel

Duct-vented hydrogen–air deflagrations: The effect of duct length and hydrogen concentration

CFD Simulations to Study Parameters Affecting Gas Explosion Venting in Compressor Compartments

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