Temperature and concentration time dependences of the aluminium phase

     Upon the detonation of the fuel-air mixture containing aluminium particles behind the wave front secondary aluminium oxidation processes occur. To prove the adequacy of description of aluminium particles behaviour behind the detonation wave front, GDT Software Group has solved a problem of aluminium burnout in the combustion products of the fuel-air mixture.
     With this purpose a model of acetylene-air mixture with the initial content of aluminium particles β = 0,1276 and the diameter d₀ = 5 micrometers was used. The initial pressure in the fuel-air mixture was assumed equal to p_i = 0,365 MPa (3,6 atmospheres), which corresponds to the initial temperature T_i = 1037K. At such temperature combustion of the fuel-air mixture starts, which results in complete oxidation of gas fuel and heating of aluminium particles with their subsequent ignition and combustion.

Time, temperature and concentration dependences of the gas phase

462 Kb

     We have solved a problem of detonation process in stoichiometric acetylene-air mixture, containing suspended aluminium powder with the initial diameter of particles d₀ = 5·10^-6Í and weight content β = 0,1276. Such aluminium content results in its complete burnout in detonation products of air-gas mixture, and the assigned initial particle diameter allows single-speed approximation.
     It is clear that two-peaked configuration develops as a result of gas fuel reaction on the front, and then combustion of aluminium particles behind the front.