A three-dimensional two-phase detonation model for aluminum dusts/air mixtures is built. A 3D numerical simulation program for detonation of suspended Al dusts is developed with space-time conservation element and solution element (CE/SE) method. Moreover, program parallelization is realized based on message passing interface (MPI) technique. Reliability of the program is demonstrated with simulation of shock tube problem and two-phase detonation experiment of Al particles/air mixtures in a detonation tube. Two-phase detonation of 368 g·m^-3 Al particles/air mixtures in left space of a corner and its aftereffect on air in the right and lower space of the corner are investigated. Propagation, reflection and diffraction of detonation wave or shock wave in complex space are obtained. It shows that air shock wave generated by two-phase detonation can reach a reflection pressure of 2.66 MPa at the solid wall 2 m far away from the Al dusts region. Fireball range exceeds initial Al dusts region by about 0.8 m. Air temperature within a range of 1.5 m near the initial Al dusts region is more than 1 600 K. The program can be used for aftereffect study of Al dusts detonation. It provides guidance for industrial safety and protection.

By introducing conductive burning process into classical deflagration-to-detonation transition (DDT) model, transition process from low speed conductive burning to convective burning to detonation was proposed. Transition process in HMX granular bed with 85% loading density was simulated. Development of conductive burning, convective burning and detonation was analyzed. In early stage combustion propagation rate is very slow. It propagates no more than 0. 2mm within 8. 16ms. After onset of convective burning, it tooks 20 ms to form a steady detonation with a velocity of 8 165 m·s^-1. Time to form detonation increases with decrease of particle diameter and ignition pressure.

Two-phase detonation of RDX particles suspended in air was numerically studied with CE/SE method.Behind leading shock front of detonation,explosive particles are accelerated and heated by the gas flow.Energy is released to support propagation of detonation wave.Dust detonation in a shock tube was numerically simulated.Distribution of physical quantity behind leading shock front was calculated.Parameters of detonation were obtained and they agree well with those in a reference.Dust detonation in a complex channel was numerically simulated.It shows that CE/SE method simulates gas-solid two-phase detonation successfully.

Droplets in liquid-liquid two-phese flow are simulated by a perturbation finite volume (PFV) method and Level Set technique. Numerical results show that the PFV scheme has advantages in fewer nodes, high accuracy and efficiency, h facilitates programming. PFV scheme successfully simulates liquid-liquid two-phase flows.