Critical Conditions of Spark Ignition of a Bidisperse Aluminum Powder in Air

Abstract

This paper presents a physicomathematical model and the results of numerical solution of the spark ignition problem for a suspension of a bidisperse aluminum powder in air. The critical ignition conditions of the aluminum-air suspension were determined numerically as a function of the particle size and mass concentration and the content of large and small particles in the suspension. The study has shown the effect of the fine particle fraction in the bidisperse aluminum powder on the critical spark ignition conditions of the aluminum-air suspension with the subsequent establishment of a steady regime of combustion front propagation.