Effects of different aluminum particle sizes in composite propellant on distributed combustion response and particle damping

According to the aluminized composite propellants with different initial particle sizes, the characteristics of the particle damping of condensed phase combustion products and the distribution combustion response were researched. The result shows that, particle damping is dependent on the particle size distribution of the condensed phase combustion products and the oscillation frequency, which is reasonably insensitive to the initial aluminum particle sizes. On the aspect of estimating the particle damping, the particle damping computed using the mono-sized particles were different from the value in the experiment, with the relative error more than 10 percent. Thus, further improvement on the prediction method is needed. On the aspect of distributed combustion response, the distributed combustion response is sensitive to the initial aluminum particle sizes in the same oscillation frequency, that is, the bigger the sizes of the initial aluminum particles are, the higher the combustion driven in the combustion, which is not good in solid rocket motor from a combustion instability point of view.