Suspended Dust Detonation Wave Structure

Dust detonation in suspension was analyzed with the one-dimensional two-phase flow model. Using this model, Dust detonation was studied for the Aluminum, RDX and Al/RDX mixture dust.In the two-phase flow model, Steady-state Detonation regimes was studied on the basis of the mathematical model of detonation of dust taking into account differences in velocities and temperatures of the mixture components. Otherwise, Momentum and energy exchanged towards the tube wall was taken into account. The resulting system of steady governing equations was solved numerically by the implicit Admas method. The accuracy of this algorithm was of the fourth order. Convergence to the solution was reached by varying the value of detonation velocity. The Chapman-Jouguet condition for the dusty mixture was used in determining the detonation velocity.Following the non-ideal detonation theory, this system of differential detonations has peculiar saddle point, in which the Mach number of the gas flow was equal to 1 and effective heat release rate was equal to zero (which was the equivalent CJ condition). Using this theory, we obtained the exact value of detonation velocity numerically. In this paper, delay of ignition, distribution of pressure and temperature was obtained as diameter of particle had changed. Moreover it provided more information about the structure of dust detonation than the classical ZND model. The influence of particles size on parameters of detonation waves was calculated. The critical diameter of particles size was Hum. This result agreed with experimental observations has been found.In this paper, pressure of detonation and development of temperature was numerically simulated when concentration of particle have changed. It was concluded that distribution of parameter was obtained and if the concentration of particles less than 0.076kg/m3, detonation of RDX dust-air in suspension didn't arise.The behavior of dust detonation of Al/RDX mixture powder was studied numerically. On the basis of the maximum detonation pressure, it has been demonstrated that there exists a synergistic effect on the maximum detonation pressure was changed with the variation of aluminum powder contents of the mixtures.