Recent Achievements and Future Challenges on the Modeling Study of AP-Based Propellants

In the past decades, studies on modeling of the combustion process of ammonium perchlorate (AP) and AP-based propellants have facilitated to support the existing experimental results and more completely, the understanding of the physical and chemical mechanisms during the reaction processes. The development of a large spectrum of models allows more accurate prediction of the structural properties and combustion behaviors of composites that govern their performance. Despite the widespread use and wide investigations, a lot of general processes still remain challenges. It should be noted that currently the problem of analytical and theoretical determination of the burning rate of AP-based propellants (as well as other propellants) has not been solved. Here, the recent achievements in this field are described, many of which promise to contribute to the development of advanced models and new approaches. The emphasis of this chapter is put on recent researches in the combustion modeling of AP-based propellants, the problems of which are of very significant scientific and practical interest. Advances in this direction make it possible to better understand the physical nature of the combustion processes and determine the factors that control the law of burning rate.