Simulation of dust explosions in complex geometries with experimental input from standardized tests

Review of the DESC project

“…Skjold, Arntzen, Hansen, Storvik, and Eckhoff (2006) and presented results obtained with DESC 1.0b2, indicating a reasonably good agreement with experimental data obtained in relatively simple geometries such as silos (Eckhoff, Fuhre, & Pedersen, 1987;Hauert, Vogl, & Radandt, 1996) and interconnected vessel systems (Lunn, Holbrow, Andrews, & Gummer, 1996). Skjold, Pu et al (2005) simulated flame acceleration experiments with gas (methane) or dust (maize starch) reported by Pu (1988) and .…”

Aplicación de la norma EN 14491:2006 a los silos de acero cilíndricos para la protección frente a explosiones de polvo

“…Algunos trabajos basados en estas técnicas ya han sido presentados (16,(26)(27)(28)(29) y abren un nuevo camino para mejorar la seguridad frente a explosiones. Sin embargo, la confianza en cualquier modelo numérico debe basarse en la validación de los resultados obtenidos mediante ensayos experimentales de explosión.…”

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

“…It is not straightforward to unambiguously define an average velocity in a transient flow field, and hence to obtain well-defined values for the root-mean-square of the turbulent velocity fluctuations (Dahoe, Cant et al, 2001;Dahoe, van der Nat et al, 2001;Skjold, 2003), and certain assumptions must be invoked in order to extract decay laws for the turbulent integral length scale from such measurements (Dahoe, van (Pu et al, 1990); (b) in two cylindrical vessels, 7 and 22 l (Yan & Pu, 1999). performed with a very limited amount of dust in the system, and the influence of the presence of dust particles on the flow is usually unknown (Dahoe, van der Nat et al, 2001;Skjold, 2003). Finally, by using the level of turbulence at time of ignition as a reference, any decay of turbulence during the period from t ig to t* is neglected; an alternative approach involves using the level of turbulence at the inflection point as reference, hence neglecting any turbulence induced by combustion during the same period (Skjold, 2006;Skjold et al, 2005Skjold et al, , 2006.…”

“…The concept of maximum effective burning velocity was suggested by Pu et al (1990), and a similar approach has recently been adopted for analyzing results from 20-l explosion vessels as input to the CFD-code DESC (Skjold, 2006;Skjold, Arntzen, Hansen, Storvik, & Eckhoff, 2006;Skjold et al, 2005). The main purpose of the present study is to investigate practical procedures for determining u eff,max from measured pressure-time histories in closed combustion vessels, and to compare results obtained in different explosion vessels.…”