Abstract
The method of gas detonation wave attenuation and suppression by chemically inert particles injection before the leading shock front is considered. Parameters and cell size of a steady detonation wave are calculated. The minimum mass fraction and total mass of particles and the characteristic size of the cloud, which are necessary for detonation wave suppression, are calculated. Methane-, Cyclohexane-, Hydrogen- and Silane-air mixtures with particles of W, WC, Al2O3, SiO2 and KCl are considered. Results of calculations quite good correspond to available experimental data. The process of suppression is more effective, if particles have high heat capacity and heat of melting. Among the particles under consideration Al2O3 and SiO2 particles are better for detonation suppression.
Detonation limits for different chemical compositions of methane-air mixtures and mass fractions of SiO2 particles are calculated. An increase of particles concentration leads to increase of the lower and decrease of the upper detonation limit. If a mass fraction of condensed phase is high enough, detonation wave propagation is impossible.
A steady detonation wave reflection from a rigid wall (D ? D reflection) in cyclohexane- and silane-air mixtures with SiO2 particles is considered. It is shown, that particles can drastically reduce pressure and temperature behind the reflected wave and therefore prevent crucial destruction of equipment.
The efficiency of detonation wave suppression at different relations between fuel and oxidizer is calculated. Methane- and cyclohexane-air mixtures with Al2O3 particles are considered. It is shown, that for every particles concentration the value of cell size has a minimum, which corresponds to a fuel-rich chemical composition. It means that for this relation between fuel and oxidizer the efficiency of detonation wave suppression by particles injection has a maximum.
