Critical phenomena in the detonation of heterogeneous fuel-air mixtures

The research experimentally determines minimum detonation initiation energy in mixtures of gasoline droplets and aluminum particles with air and its dependence on temperature. Studies have shown that the minimum detonation initiation energy in mixtures of B-70 gasoline droplets with air depends on the temperature and does not depend on the diameter of the pipe. They failed to trigger detonation in dodecan mixtures - air and diesel fuel - air. Moreover, dodecan droplets did not even ignite.The process of initiating and propagating stationary detonations in suspensions of Al particles of various sizes and shapes in the shock tube was investigated. Medium sized aluminum suspensions exceeding 10 μm did not ignite in air or oxygen. Aluminium-air suspensions with scale-like particles with thickness of about 1 μm and diametral size of (10-15) μm have the same detonation capacity as gaseous fuel-air mixture. Spherical aluminum particles with a diameter of 1 μm had a slightly higher detonation capacity, i.e., the detonation capacity of aluminum suspensions increases significantly with a decrease in particle size. The rate of detonation propagation in gasoline and aluminum airborne units was measured.