Internal and external pressure prediction of vented gas explosion in large rooms by using analytical and CFD methods

Abstract

This paper presents an analytical and a numerical method to predict the internal and external pressures from vented gas explosion in a large enclosure. The first peak internal pressure near the venting of enclosure, which is the primary factor related to the external pressure in far field, is predicted by using analytical correlations. The accuracy of the analytical method is verified by using data from a series of experiments with idealized conditions. However, the incapability of external pressure prediction and over-prediction of peak internal pressure are seen in the realistic scenario by using the analytical approach. Therefore computational Fluid Dynamics (CFD) simulations are consequently performed to accurately estimate both the internal and external pressures of vented explosions. A CFD modelling procedure is suggested in this paper to model the turbulent flame inside the enclosure by using FLACS and to calculate the blast wave propagation with low turbulence in free air by using ANSYS Fluent. This combined CFD modelling approach is proven yielding good predictions of internal and external pressures from vented explosions.

Modular phenomenological model for vented explosions and its validation with experimental and computational results

“…Unburnt gas venting and external cloud formation is a complex process which results in external explosion. The vortex roll-up mechanism is clearly observed in experimental [18] and computational investigations [23] as shown in Fig. 7.…”

Revealing patterns of the effective mechanical characteristics of cellular sheet polycarbonate for explosion venting panels

“…The current theory of burning, explosion, and detonation of combustible mixtures properly describes processes associated with the phenomena of explosive combustion during their progress inside pipes and other similar spaces. Paper [5] considered analytical and numerical methods for predicting the internal and external pressure of gas-air mixtures explosion within large volumes; however, explosions of combustible mixtures within larger volumes, in comparison with volumes at industrial premises, have not been examined enough up to now. Given this, resolving practical tasks for protection of premises with explosive industrial production against destruction requires that such initial data should be considered that would make it possible to obtain reliable results in terms of protection against explosions.…”

“…When using formulae (5) and 6, it is necessary to define basic geometric and estimation parameters. These parameters were determined for all types of CPS.…”

“…These parameters were determined for all types of CPS. Parameters defined in order to implement formulae (5) and (6) are given in Table 4. By applying the estimation data obtained from formula (5) and given in Table 4, we determined effective rigidity of CPS of varying thicknesses.…”

Access Control Points: Reducing a Possible Blast Impact by Meandering

“…Certain concepts for designing venting surfaces for gas explosions (e.g., [10,11]) are publically available. However, blasts from solid explosives in con ned spaces are in general faster and are characterized by much higher peak pressure and often smaller impulse values in comparison to gas explosions.…”