Spark ignition critical conditions for aluminum-air suspension

We have numerically solved the spark ignition problem of aluminum-air suspension. The aim of the research was to determine the critical ignition conditions for an aluminum powder depending on the size and mass concentration of the particles. According to the obtained result an increase in the particle size leads to an increase in the minimum energy which is required to ignite the suspension and make it possible the combustion front to propagate. With an increase in the mass concentration of the particles and under the excess oxidant ratio close to unity the minimum energy of the spark ignition tends to the same value and becomes independent on the mass concentration of the particles.