TY - JOUR A1 - Scheid, Marc A1 - Geißler, Andreas A1 - Krause, Ulrich T1 - Experiments on the influence of pre-ignition turbulence on vented gas and dust explosions JF - Journal of loss prevention in the process industries N2 - Experiments were performed on the influence of pre-ignition turbulence on the course of vented gas and dust explosions. A vertical cylindrical explosion chamber of approximately 100 l volume and a length-to-diameter ratio (l/d) of 4.7 consisting of a steel bottom segment and three glass sections connected by steel flanges was used to perform the experiments. Sixteen small fans evenly distributed within the chamber produced turbulent fluctuations from 0 to 0.45 m/s. A Laser-Doppler-anemometer (LDA) was used to measure the flow and turbulence fields. During the experiments the pressure and in the case of dust explosions the dust concentration were measured. In addition, the flame propagation was observed by a high-speed video camera. A propane/nitrogen/oxygen mixture was used for the gas explosion experiments, while the dust explosions were produced by a cornstarch/air mixture. It turned out that the reduced explosion pressure increased with increasing turbulence intensity. This effect was most pronounced for small vents with low activation pressures, e.g. for bursting disks made from polyethylene foil. In this case, the overpressure at an initial turbulence of 0.45 m/s was twice that for zero initial turbulence. KW - Gas explosions KW - Dust explosions KW - Turbulence KW - Venting PY - 2006 DO - https://doi.org/10.1016/j.jlp.2007.03.001 SN - 0950-4230 SN - 1873-3352 VL - 19 IS - 2-3 SP - 194 EP - 199 PB - Butterworth CY - Guildford, Surrey AN - OPUS4-11833 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -