Flame dynamics in a vented vessel connected to a duct: 1. Mechanism of vessel-duct interaction

Ponizy, B.; Leyer, J.C.

doi:10.1016/s0010-2180(98)00038-8

Cited by 89 publications

(104 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The oscillatory peaks observed shortly after the flame has left the duct, could be related to the backward propagating train of compression waves created by the strongly unsteady flame propagation in the duct [4,5]. Similar pressure traces in the main vessel and in the relief duct have been observed for the same venting configurations on both smaller scales and larger scales [3,8,9].…”

Section: Flow and Combustion Dynamicsmentioning

confidence: 70%

“…In particular the sudden energy release necessary to generate the shock wave in the duct is to be linked to a secondary explosion in the initial sections of the duct [2,3,4] and is sometimes referred to in literature as burn-up. Burn-up in the duct has then to be considered a crucial phenomenon affecting the final overpressure of the vessel.…”

Section: Flow and Combustion Dynamicsmentioning

confidence: 99%

“…The presence of the duct, however, results in an enhancement of the explosion severity in comparison to simply vented vessels [2,3]. This can lead to an increase in maximum overpressure by a factor of ten or more [4].…”

Section: Introductionmentioning

confidence: 99%

“…Some experimental works have focused on the effect of the duct length and diameter upon explosion overpressure, allowing some trends to be drawn [4,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Other work has focused on the effect of traditionally fundamental parameters in simply vented explosions such as the ignition position, initial turbulence and pressure of vent deployment [4,9]; a particular point raised in this work is that central ignition is addressed as the worst case. This is in agreement with the general trend observed in literature for simply vented vessels.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Duct-vented Propaneiair Explosions With Central And Rear Ignition

Ferrara¹,

Benedetto²,

Willacy³

et al. 2005

Fire Safety Science - Proceedings of the Eigth International Sy

View full text Add to dashboard Cite

It is commonplace in industrial installations to have duct vented vessels, the design of which is often based upon the premise that central ignition will provide the worst case scenario. This research investigates duct-vented explosions using a vented test chamber of 200 l capacity fitted with a 1m long vent pipe, discharging into a large (50 m 3 ) dump volume with rear and central ignition. Propane-air mixtures over a range of concentrations (Ф=0.8-1.6) have been used. Results show that while there is no significant difference in maximum pressure in the test vessel for rear and central ignition, rear ignition consistently produces the worst case in terms of rates of pressure rise and flame-speeds in the duct. In addition, the detailed records of pressure traces and flame position showed a direct relationship between the induced gas velocity in the duct prior to the flame arrival and the subsequent rate of pressure rise in the vessel. The implications of the findings for practical systems are briefly discussed.

show abstract

Section: Flow and Combustion Dynamicsmentioning

confidence: 70%

Section: Flow and Combustion Dynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Some experimental works have focused on the effect of the duct length and diameter upon explosion overpressure, allowing some trends to be drawn [4,7,8].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Duct-vented Propaneiair Explosions With Central And Rear Ignition

Ferrara¹,

Benedetto²,

Willacy³

et al. 2005

Fire Safety Science - Proceedings of the Eigth International Sy

View full text Add to dashboard Cite

show abstract

Study on characteristics of methane explosion flame and pressure wave propagation to the non‐methane area in a connected chamber

Liu

Wang

et al. 2021

Fire and Materials

View full text Add to dashboard Cite

This study is aimed at investigating the characteristics of CH 4 explosion diffusion and propagation to the non-methane area. The CH 4 explosion pressure and flame were tested with the aid of a self-built horizontal pipeline system. On this basis, the flame images, photoelectric signals, and pressure propagation laws during explosions of methane with different volume fractions in the pipeline were obtained. The experimental research results indicate that an obvious secondary explosion pressure occurs at L/D = 3.5. After the explosion pressures at different positions along the entire pipeline reach the peak values, they experience varying degrees of oscillations. The maximum explosion pressure in the non-methane zone may occur at different length-to-diameter ratios. When the volume fraction of CH 4 is larger, the maximum explosion pressure occurs farther. However, the explosion pressure at the end of the pipeline is lower than that at the explosion source. The flame intensity and flame duration of methane explosion are remarkably enhanced at L/D = 17.5 and then become gradually weakened in the non-methane area. The variations of explosion pressure are always prior to those of flame signal. CO and CO 2 are the main toxic and harmful gases produced by methane explosions, and high-concentration (13% in this experiment) methane explosions produce a small amount of hydrocarbon gases such as C 2 H 4 and C 2 H 6 . The volume fractions of the gases produced decrease with the increase in the distance from the explosion source. The research results boast great significance for suppressing methane explosions and their propagation in the pipeline.

show abstract

Investigation on quenching characteristics of parallel narrow channels for deflagration flames

Guo

Wang

et al. 2023

Fire and Materials

View full text Add to dashboard Cite

A set of experimental equipment for quenching the deflagration flame in linked vessels with parallel narrow channels was proposed. The quenching effects of the deflagration flame in the linked vessels were investigated, the influence law and mechanism of parallel narrow channels on the deflagration flame was analyzed. The results showed that the Pmax and the (dP/dt)max at each position were both lower than without parallel narrow channels, which indicated that the propagation of flame was inhibited by parallel narrow channels effectively, and the explosion intensity was also reduced. The pressure oscillation phenomenon inside the linked vessels disappeared due to the inclusion of parallel narrow channels. The deflagration flame was successfully quenched when the channel gaps were 0.5, 1.5, and 3 mm, but failed to be quenched when the channel gap was 6 mm. The quenching distance and the average propagation velocity of the deflagration flame in parallel narrow channels increased with the increase of the channel gap. When the channel gap was 6 mm, the deflagration flame completely passed through parallel narrow channels, and the average propagation velocity of deflagration flame was significantly greater than that when the deflagration flame was successfully quenched.

show abstract

Flame dynamics in a vented vessel connected to a duct: 1. Mechanism of vessel-duct interaction

Cited by 89 publications

References 3 publications

Duct-vented Propaneiair Explosions With Central And Rear Ignition

Duct-vented Propaneiair Explosions With Central And Rear Ignition

Study on characteristics of methane explosion flame and pressure wave propagation to the non‐methane area in a connected chamber

Investigation on quenching characteristics of parallel narrow channels for deflagration flames

Contact Info

Product

Resources

About