Abstract: Two phase detonations of aluminum dust are simulated in a multi-fluid model to study particle energy calculation methods. In previous studies heat capacities of solid particles are constants, while realistic heat capacities change with temperature. In this simulation, effects of realistic heat capacities are studied. Numerical results show that detonation parameters are influenced significantly. The results with realistic capacities are close to experiments, while the results with fixed capacities overestimate pressure and detonation velocity. In detonation initiation, run-up distance is mainly decide by ignition energy, while realistic effect makes the distance shorter than that in the fixed heat capacity case.

Key words: gas-solid two phase, detonation, aluminum dust, heat capacity