TY - JOUR A1 - Mitropetros, Constantinos A1 - Fomin, P. A. A1 - Hieronymus, Hartmut A1 - Steinbach, J. T1 - Modelling of detonation wave parameters, initiation and hazard of chemically active bubble systems N2 - The detonation processes in chemically active bubble systems at high initial pressures are calculated numerically. The dependences of detonation wave velocity at sub- and supersonic regimes of propagation on molar fraction of gas in the mixture and on initial pressure have been calculated for the first time. The Chapman-Jouguet condition for supersonic bubble detonation wave is obtained. The principal possibility for a different detonation wave structure in the case of propagation in the mixture with high initial pressure and longitudinal gradient of bubble volume fraction is predicted. The dynamics and ignition of a chemically active bubble in a field of external pressure is analyzed. It is shown, that an inert diluent addition can increase the explosion hazard of heterogeneous gas - liquid systems. Calculations demonstrate the possibility of chemically active bubble ignition on the second pulsation. It is shown, that single chemically active bubble ignition is possible also owing to a decompression impulse. An algorithm for the calculation of thermodynamic parameters of chemically equilibrium hydrocarbon gas with soot particles has been suggested. It is shown, that soot formation can have an essential influence on the dynamics of single bubble in chemically active hydrocarbon-oxygen (organic solvent (liquid) - oxidizer (gas)) heterogeneous systems. T2 - 4th International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions ; 4th ISHPMIE ; 10th International Colloquium on Dust Explosions ; 5th Colloquium on Gas, Vapor, Liquid, Hybrid Explosions CY - Bourges, France DA - 2002-10-21 PY - 2002 DO - https://doi.org/10.1051/jp4:20020309 SN - 1155-4339 VL - 12 IS - 7 SP - 403 EP - 412 PB - EDP Sciences CY - Les Ulis AN - OPUS4-1640 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hieronymus, Hartmut A1 - Kasch, Thomas A1 - Fomin, P. A1 - Trotsyuk, A. ED - Doerffer, P. T1 - Modeling of film and surface detonations T2 - 5th International Symposium on Experimental and Computational Aerothermodynamics of Internal Flows ; 5th ISAIF CY - Gdansk, Poland DA - 2001-09-04 PY - 2001 SN - 83-88237-35-7 VL - 2 SP - 935 EP - 943 PB - IFFM Publ. CY - Gda´ nsk AN - OPUS4-1157 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Mitropetros, Constantinos A1 - Hieronymus, Hartmut A1 - Fomin, P. A1 - Taratuta, S. ED - Doerffer, P. T1 - Modeling of detonation wave initiation, limits and hazard of chemically active bubbles T2 - 5th International Symposium on Experimental and Computational Aerothermodynamics of Internal Flows ; 5th ISAIF CY - Gdansk, Poland DA - 2001-09-04 PY - 2001 SN - 83-88237-35-7 VL - 2 SP - 925 EP - 933 PB - IFFM Publ. CY - Gda´ nsk AN - OPUS4-1158 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Fomin, P.A. A1 - chen, J.-R. A1 - Hieronymus, Hartmut T1 - Shock induced explosion of oxygen containing bubble in a flammable liquid: safety aspects of fuel condensation and evaporation T2 - 7th International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions (ISHPMIE) CY - St. Petersburg, Russia DA - 2008-07-07 KW - Detonation KW - Bubbles KW - Shock wave KW - Condensation PY - 2008 VL - III SP - 141 EP - 150 AN - OPUS4-18035 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Palymsky, I.B. A1 - Fomin, P.A. A1 - Hieronymus, Hartmut T1 - Rayleigh-Benard convection in gas with chemical reactions T2 - 7th International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions (ISHPMIE) CY - St. Petersburg, Russia DA - 2008-07-07 KW - Detonation KW - Surface detonation KW - Convection PY - 2008 VL - I SP - 131 EP - 138 AN - OPUS4-18036 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Palymskiy, I.B. A1 - Fomin, P.A. A1 - Hieronymus, Hartmut T1 - Rayleigh-Benard convection in a chemical equilibrium gas (simulation of surface detonation wave initiation) N2 - The problem of the Rayleigh–Benard convection for a chemical equilibrium gas is solved numerically. The gas is assumed to be incompressible, and the layer boundaries are assumed to be flat, isothermal, and free from shear stress. The Boussinesq model with the coefficient at the buoyancy term depending on the transverse coordinate is used. The resultant nonlinear system of equations is solved by a previously developed numerical method based on the spectral representation of vorticity and temperature fields. According to the idea of splitting, analytical formulas are first used to take into account the linear increase in disturbances, and then the nonlinear convective transfer is calculated by the finite-difference method. Various convection modes are obtained: stationary, periodic, quasi-periodic, and stochastic convection. The model of convection of a chemical equilibrium gas, presented here, can be useful for the understanding of the transition of a cellular combustion of surface systems into an explosion (initiation of surface detonation) and for the calculation of operating regimes of chemical reactors. KW - Rayleigh-Benard convection KW - Chemically equilibrium gas KW - Periodicity KW - Quasi-periodicity KW - Stochastic KW - Surface detonation KW - Initiation PY - 2008 DO - https://doi.org/10.1016/j.apm.2007.01.007 SN - 0307-904X SN - 1872-8480 VL - 32 IS - 5 SP - 660 EP - 676 PB - Elsevier Science CY - New York, NY AN - OPUS4-17656 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -