Experimental Studies of Explosions of Methane-Air Mixtures in a Constant Volume Chamber

Abstract

Results are presented for the variation of flame propagation velocity with rising explosion pressure for methane-air mixtures. The experiments were carried out in an explosion chamber with a volume of 1.25 m 3 . Photos of the flame propagating during the explosion processes were obtained through a window in the middle of the front cover of the chamber. The influence of the methane concentration on the time delay between the flame front approaching the chamber wall and the moment when the pressure inside the chamber reached its maximum is also discussed.

Prediction of Deflagrative Explosions in Variety of Closed Vessels

“…The simulated pressure did not follow the experimental curve so well and underestimates the (dP/dt) max by around 30-35 bar/s (30-40%). However, the comparison with (dp/dt) max provided by Gieras [39] and Kunz [40] in vessels of similar volume and shape were very close to the value obtained numerically. Experiments shown in Figure 9 also show some discrepancies between maximum pressures achieved P max between 7.0 and 7.93 bar and this range was very close to the values recorded by both simulations (7.0-8.06 bar).…”

“…Parameter (dp/dt) max from simulations in 0.02 m 3 is lower than experimental but very close to the value provided in European standard EN 15,967 of 235 ± 7.4 bar/s. In case of 1 m 3 simulated (dp/dt) max was underestimated by around 30-40% with respect to the experimental value but within the range of (dp/dt) max provided by Gieras [39] and Kunz [40] in vessels of similar volume and shape. Combustion in a 6 m 3 vessel shows high influence of the vessel geometry on the recorded pressures in both simulations and experiments.…”

“…Experiments shown in Figure 9 also show some discrepancies between maximum pressures achieved Pmax between 7.0 and 7.93 bar and this range was very close to the values recorded by both simulations (7.0-8.06 bar). [39] and Kunz [40] in the vessels of a similar volume and shape.…”

“…This layout of the pressure curve was observed independently on the flammable mixture investigated. As the dP/dt curve deliv- [39] and Kunz [40] in the vessels of a similar volume and shape. Simulations of CH4-air combustion in closed vessels showed that the implemented model predicts the pressure history and pressure dynamics curve with the acceptable level of accuracy.…”

Turbulent explosion characteristics of stoichiometric syngas

“…2 Therefore, the knowledge about explosion characteristics of syngas is essential to both the optimization design on syngas-fuelled applications and the safety protection strategies on storage and delivery of syngas. Albeit the fundamental research works about explosion characteristics have been excessively experimentally performed in the past decade, most of those works were conducted on hydrocarbon fuels, such as n-pentane, 3 propylene, 4 methane, 5 methyl ether, 6 nitromethane, 7 ethylene, 8 and n-alkane. 9 However, the research works about explosion characteristics of syngas are very scarce in current literatures, and the reported information about explosion parameters are relative limited.…”