Influence of Ammonium Perchlorate and Aluminum Powder on the Combustion Characteristics of AP-CMDB Propellant

The influences of particle size and content of ammonium perchlorate(AP) and aluminum powder(Al) on the combustion characteristics of AP-CMDB propellant are experimentally studied by determining the burning rates and pressure exponents of the propellant at different pressures.The results show that the smaller granule AP and the larger granule Al powder make the burning rates of AP-CMDB propellant increase effectively,and the smaller granule AP and Al make the pressure exponents in the pressure range of 10-20MPa increase.When the mass fraction of Al powder is lower than 14%,the combustion characteristics of AP-CMDB propellant are not obviously affected by the contents of AP and Al.When the mass fraction of Al powder is higher than 14%,the burning rates of AP-CMDB propellant are decreased because of the incomplete combustion of Al.